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PIC16C54A-20E/SS - 8-Bit 20MHz OTP MCU 768B | Microchip
PIC16C54A-20E/SS

PIC16C54A-20E/SS - 8-Bit 20MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54A-20E/SS is an 8-bit RISC microcontroller in the PIC16C5X family, featuring a 20 MHz maximum clock input, 768 bytes of One-Time-Programmable (OTP) program memory (512 x 12 words), 25 bytes of RAM, and 12 general-purpose digital I/O pins in a 20-pin SSOP (Shrink Small Outline) package. The device executes instructions from a 33-instruction set, with most instructions completing in a single 200 ns instruction cycle; only program branches require two cycles (400 ns). The operating voltage range is 4.5 V to 5.5 V, the part is specified for the extended industrial temperature grade (-40 °C to +125 °C), and an on-chip RC oscillator plus support for external crystal/ceramic resonator or external clock inputs give designers flexibility on the clocking topology. A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, working RAM, and peripheral I/O on one die. 8-bit MCUs like the PIC16C5X sit at the entry level of the microcontroller taxonomy: 8-bit -> RISC microcontroller -> embedded controller -> semiconductor. They typically serve cost- and power-sensitive deterministic control tasks rather than compute-heavy or user-interface applications, and the PIC16C5X family in particular targets low-cost, high-volume appliance, automotive, and industrial control designs with a RISC architecture and Harvard bus structure. Key differentiating features of the PIC16C54A-20E/SS include its OTP program memory (factory- or field-programmable but not electrically re-programmable in-circuit like flash), 12-bit wide instructions that yield roughly 2:1 code compression over competing 8-bit CISC cores, and a watchdog timer with its own on-chip RC oscillator for unattended operation. The wide operating temperature range suits automotive under-hood and industrial cabinet environments. Architecturally, the PIC16C54A uses a two-stage pipelined Harvard architecture: the program and data buses are physically separate, so an instruction fetch does not collide with a data read. The 12-bit instruction word keeps opcode decoding logic small, which is why the silicon area (and cost) stays low even at 20 MHz throughput. Typical applications include automotive body and chassis subsystems (window lifters, seat controllers, simple sensor interfaces), white goods and small appliance control (coffee makers, microwave ovens, washing machine user-interface panels), industrial control (sensor signal conditioning, relay drivers, simple PID loops implemented in firmware), and consumer electronics (remote controls, toys, low-cost key fobs). When designing with this device, plan firmware layout around the OTP constraint: any firmware revision that needs to change program memory requires a new part. Designers targeting in-circuit reprogrammability should evaluate the pin-compatible PIC16F54 instead, which uses Flash program memory. This page synthesizes distributor pricing, cross-reference alternatives, and practical design notes not found in the manufacturer datasheet alone, and is optimized for engineers and procurement teams evaluating PIC16C54A-20E/SS for new designs and legacy replacements.

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PIC16C54A-20I/P - 8-Bit 20MHz OTP MCU, 512x12 ROM | Microchip
PIC16C54A-20I/P

PIC16C54A-20I/P - 8-Bit 20MHz OTP MCU, 512x12 ROM | Microchip

The Microchip Technology PIC16C54A-20I/P is a 20 MHz, 8-bit, fully-static, EPROM/ROM-based CMOS microcontroller in the PIC16C5X family, housed in an 18-pin PDIP (P) through-hole package. It integrates 512 × 12-bit words of one-time-programmable (OTP) program ROM, 25 bytes of data RAM, and 12 digital I/O pins, providing a compact compute engine for cost-sensitive embedded control. The device operates from a 4.5 V to 5.5 V single supply, supports clock speeds up to 20 MHz, and is specified over the industrial temperature range (-40 °C to +85 °C). An 8-bit microcontroller (MCU) is a small computer-on-a-chip that integrates a CPU core, program memory, working RAM, I/O peripherals, and a clock generator into a single package. The PIC16C5X family belongs to the broader category of microcontrollers within the integrated-circuits taxonomy: microcontroller -> embedded controller -> semiconductor device. The 'C' in PIC16C5X denotes OTP EPROM program memory (one-time programmable, windowed for prototype erase). The 12-bit-wide instruction word gives 2:1 code compression over typical 8-bit CISC microcontrollers in the same price class, and the 8-bit data path keeps the core simple and deterministic for real-time control. Key features include a RISC architecture with 33 single-word/cycle instructions, a two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, a watchdog timer with on-chip RC oscillator, and power-saving SLEEP mode. The industrial-grade -I/-P variant is rated for -40 °C to +85 °C operation and is delivered in a plastic DIP-18 through-hole package suited for breadboarding, legacy equipment, and industrial controls. A Microchip newer-device notice recommends PIC16F54 as a modern Flash replacement for new designs. Typical applications include appliance controllers, simple sensor interfaces, LED drivers, battery chargers, automotive sub-systems, and industrial timer/counter logic where the small footprint, deterministic execution, and proven 5 V PIC ecosystem outweigh the need for larger memory or analog peripherals. When designing with PIC16C54A-20I/P, note that OTP program memory cannot be re-programmed in-circuit; for production firmware revision flexibility consider the PIC16F54 (Flash) drop-in alternative in the same PDIP-18 footprint. Use a 4.7 kΩ pull-up on MCLR/VPP and provide a stable 20 MHz clock to OSC1 with appropriate capacitor selection per the crystal/ resonator manufacturer's load capacitance guidance. The PIC16C54A-20I/P remains in active production for industrial and legacy designs, but Microchip's product page explicitly recommends PIC16F54 for new designs. This page synthesizes distributor pricing, drop-in PIC16C54/55/57 family alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C54A-20I/SO - 8-Bit 20MHz OTP MCU 768B | Microchip
PIC16C54A-20I/SO

PIC16C54A-20I/SO - 8-Bit 20MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54A-20I/SO is a member of the PIC16C5X family of low-cost, high-performance 8-bit fully static EPROM/ROM-based CMOS microcontrollers. It runs at 20 MHz clock speed, provides 768 bytes (512 × 12) of OTP program memory, 25 bytes of RAM, and operates from a 4.0V to 6.0V industrial-temperature supply. The device is housed in an 18-pin SOIC (SO) package. An 8-bit microcontroller is a small computing system-on-chip integrating an 8-bit CPU core, program memory, data RAM, and peripheral interfaces. The PIC16C5X family uses a RISC architecture with 33 single-word/single-cycle instructions, achieving 2:1 code compression versus competing 8-bit MCUs in its class. It executes most instructions in 200 ns at 20 MHz, providing deterministic timing suitable for cost-sensitive embedded control. The PIC16C54A specifically targets applications requiring absolute minimalism — no interrupts, two-level hardware stack, and seven/eight SFRs — making it a baseline controller for hard real-time logic. Key features include a 12-bit wide instruction word with 8-bit data path, an 8-bit real-time clock/counter (TMR0), direct/indirect/relative addressing modes, 12 I/O pins, and an integrated power-on reset / brown-out detector on later revisions. The wide operating voltage (4.0V–6.0V) and industrial temperature range (-40°C to +85°C, denoted by the 'I' suffix) suit industrial, automotive aftermarket, and consumer appliances. Typical applications include timer replacements, smart-card readers, simple motor drives, security keypads, and battery chargers. The EPROM-based OTP memory makes it ideal for low-volume production where Flash reprogrammability is unnecessary but fast time-to-market matters. When designing with this part, note that the PIC16C54A is now flagged as Not Recommended for New Designs by Microchip — consider the Flash-based PIC16F54 as a modern drop-in equivalent for new projects, while continuing to source the OTP version for legacy repairs. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond what the manufacturer datasheet alone provides, including lifecycle guidance for NRND parts.

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PIC16C54A-20I/SS - 8-bit OTP MCU 20MHz 12 I/O SSOP-20 | Microchip
PIC16C54A-20I/SS

PIC16C54A-20I/SS - 8-bit OTP MCU 20MHz 12 I/O SSOP-20 | Microchip

The Microchip Technology PIC16C54A-20I/SS is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, delivering 20 MHz operation, 768 bytes of OTP program memory and 25 bytes of RAM in a 20-pin SSOP (0.209 inch / 5.30 mm) industrial-temperature package. The 'I' suffix denotes an industrial operating range of -40C to +85C, while '20' specifies the 20 MHz maximum clock speed; 'SS' identifies the SSOP-20 footprint and '/SS' is the Microchip tape-and-reel packaging designator. A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and peripheral I/O. The PIC16C5X family sits at the foundational tier of Microchip's 8-bit MCU portfolio, using a RISC Harvard architecture with 12-bit-wide instructions and 8-bit-wide data path, two-level hardware stack, and direct/indirect/relative addressing modes. These parts ship in One-Time-Programmable (OTP) EPROM variants and target cost-sensitive, high-volume embedded control where program code is finalized at production. Key features of the PIC16C54A-20I/SS include 12 I/O pins, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, a Watchdog Timer (WDT) with on-chip RC oscillator for reliable resets, and power-saving SLEEP mode. Power-on reset, power-up timer and oscillator start-up timer eliminate external reset circuitry. The SSOP-20 (5.30 mm body width) is significantly narrower than the PDIP-20 footprint, enabling compact board designs while still offering 20 functional pins. The PIC16C54A-20I/SS uses CMOS process technology with static (fully static) operation, allowing the clock to be stopped without losing register state - an unusual and useful feature for low-power applications. The 12-bit instruction word provides 2:1 code compression versus typical 8-bit MCUs of its era, allowing tighter code density in 768 bytes of OTP. The PIC16C5X core executes one instruction per instruction cycle (four oscillator clocks), giving 5 MIPS at 20 MHz - more than adequate for control loops, simple protocols and state-machine glue logic. Typical applications include appliance control (washing machines, microwave ovens, coffee makers), HVAC thermostat controls, security and fire-alarm panels, remote-control transmitters and receivers, and automotive body modules (RKE, lighting). The wide industrial temperature range plus the 4.5V-5.5V supply voltage make it suitable for 5V-only industrial subsystems and battery-backed sensor nodes. Per Microchip, PIC16F54 is the recommended newer migration target with flash memory, identical pinout and same peripherals. When designing with the PIC16C54A-20I/SS, ensure the OTP memory programming flow matches the chosen programmer (e.g., MPLAB PM3 or PICSTART Plus), because OTP parts can only be programmed once. Use the in-circuit debug header only on the JW (windowed) variants, not on the OTP/SS industrial part. Decouple VDD with a 0.1 uF ceramic plus 10 uF electrolytic placed within 5 mm of the supply pins. This page consolidates current distributor pricing, drop-in alternative pinouts, and pragmatic design notes that complement the manufacturer datasheet and reference manuals.

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PIC16C54A/JW - 8-bit OTP MCU, 20MHz, CERDIP | Microchip
PIC16C54A/JW

PIC16C54A/JW - 8-bit OTP MCU, 20MHz, CERDIP | Microchip

The Microchip Technology PIC16C54A/JW is an 8-bit RISC microcontroller from the PIC16C5x family, featuring a 20 MHz core processor, 768 bytes (512 x 12) of One-Time-Programmable (OTP) EPROM program memory, and 25 bytes of data RAM, housed in an 18-pin CERDIP (windowed, JW) through-hole package. It operates from 4.5V to 5.5V with 12 I/O pins and integrates Power-On Reset (POR), a Watchdog Timer (WDT), and an 8-bit timer/counter (TMR0). Per Microchip's product page, the PIC16C54A is flagged as 'Not Recommended for new designs,' with the PIC16F54 suggested as a newer alternative. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and programmable I/O peripherals. The PIC16C5x family uses a 12-bit-wide instruction word with an 8-bit data path and a two-level hardware stack, which provides deterministic execution and very compact code (approximately 2:1 code compression vs other 8-bit MCUs of its era). OTP EPROM program memory allows the device to be programmed once after manufacture and retained indefinitely, while the 'JW' suffix denotes a CERDIP windowed package that exposes the die to UV light for erasing the EPROM during development. Key features include 12 CMOS bidirectional I/O pins arranged in two ports (RA, RB), direct/indirect/relative addressing modes for data and instructions, a wide commercial operating temperature range, and low CMOS power consumption. The 20 MHz clock rate delivers approximately 5 MIPS of throughput, and the simple RISC architecture of just 33 single-cycle instructions allows rapid firmware development. The device has been widely used in legacy embedded systems and is supported by Microchip's MPLAB IDE toolchain. Typical applications include appliance control modules, simple sensor interfaces, hobbyist and educational projects, and legacy industrial controllers. The windowed CERDIP package is particularly useful during prototyping because the EPROM can be erased with UV exposure, enabling code iteration without discarding the device. Designers frequently use PIC16C54A/JW as a development platform and then migrate to lower-cost OTP or QFN packages for volume. When designing with this part, note that the JW package is intended primarily for development. The plastic CERDIP, PDIP, SOIC, or SSOP variants are recommended for production. Engineers should confirm whether their application requires the windowed erase capability or whether a one-time-programmable variant suffices. This page synthesizes distributor pricing, drop-in Microchip alternatives, and practical design notes not found in the manufacturer datasheet alone. The data presented has been cross-referenced with DigiKey, Mouser, Octopart, and Microchip's own product page.

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PIC16C54AT-04E/SO - 8-Bit 4MHz OTP MCU 768B | 18-SOIC
PIC16C54AT-04E/SO

PIC16C54AT-04E/SO - 8-Bit 4MHz OTP MCU 768B | 18-SOIC

The Microchip Technology PIC16C54AT-04E/SO is an 8-bit, 4 MHz EPROM/ROM-based CMOS microcontroller in the PIC16C5X family, packaged in an 18-pin SOIC (SO) wide-body outline. It integrates 768 bytes of OTP program memory (organized as 512 x 12-bit words), 25 bytes of general-purpose RAM, and 12 I/O pins across the PIC16C54A silicon revision. An 8-bit microcontroller (MCU) is a single-chip computer whose data path, registers, and ALU operate on 8 bits at a time. The PIC16C5X family sits at the entry-level tier of Microchip's 8-bit portfolio, below the mid-range PIC16 and enhanced mid-range families. These baseline parts use a 12-bit-wide instruction word and a RISC-like Harvard architecture, where program and data memories have separate buses. The 8-bit MCU category belongs to the broader microcontroller hierarchy, which itself falls under embedded processors, integrated circuits, and finally semiconductors. OTP (One-Time Programmable) memory is a non-volatile technology that can be written once by the user, distinguishing the C5X family from flash-based PIC16F parts and from windowed EPROM C5X parts that allow erasure via UV light. Key features include a single-cycle 1 microsecond instruction cycle at 4 MHz, a 33-word instruction set where all instructions execute in one cycle except program branches (two cycles), and a 12 I/O pin count with independent direction control. The device also provides a watchdog timer for runaway code recovery, a power-on reset circuit, and an operating voltage range of 4.5 V to 5.5 V. The 'A' silicon revision improves upon the original PIC16C54 by adding oscillator selection bits and refined brown-out behavior. Architecturally, the PIC16C5X uses a two-stage pipeline overlapped with instruction fetch, so most instructions appear to execute in a single cycle. The 12-bit instruction width yields 2:1 code density compared to typical 8-bit MCUs of its era, and the symmetrical instruction set reduces development time. The OTP program memory is written using Microchip's serial programming protocol via the RB6/RB7 pins. Typical applications include low-cost embedded control nodes, appliance control boards, automotive body electronics subsystems, simple sensor interface modules, and hobby/educational microcontroller projects where legacy code bases already target the PIC16C5X instruction set. Designers transitioning new designs to the PIC16F54 are advised to verify peripheral compatibility, as the F54 family uses flash memory and a slightly different configuration word layout. When designing with this part, remember that OTP parts cannot be reprogrammed; budget for a small engineering rework loop or use the PIC16C54A-04E/SO equivalent windowed version for prototype bring-up. The 18-SOIC package has a thermal resistance in the typical 80-100 C/W range for small-outline SO packages, so derate output current if the device will be operated near maximum temperature. This page synthesizes distributor stock, drop-in same-package alternatives, and practical engineering design notes not aggregated in the manufacturer datasheet.

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PIC16C54AT-04I/SO - 8-Bit 4MHz OTP MCU, 768B | Microchip
PIC16C54AT-04I/SO

PIC16C54AT-04I/SO - 8-Bit 4MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16C54AT-04I/SO is an 8-bit PIC RISC microcontroller with 4 MHz operating speed, 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, and 25 bytes of RAM, housed in an 18-pin SOIC package supplied on tape and reel. As a member of the PIC16C5X family, it offers 12 I/O pins, an external oscillator interface, Power-on Reset (POR), and a Watchdog Timer (WDT), with 33 single-word instructions most of which execute in a single 200 ns instruction cycle. Background Knowledge: A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and peripherals into one device. Microcontrollers are classified by data bus width (4-bit, 8-bit, 16-bit, 32-bit) and memory technology (ROM, EPROM, OTP, Flash). An OTP (One-Time-Programmable) MCU is programmed once by the user and cannot be erased electrically, making it ideal for low-cost, high-volume production where firmware is finalized. The PIC16C5X family uses a RISC architecture with 12-bit wide instructions that achieve roughly 2:1 code compression versus 8-bit CISC competitors, which historically gave the family strong price/performance positioning in the 1990s and early 2000s. Key features of the PIC16C54AT-04I/SO include its compact 768-byte OTP program memory, 4 MHz maximum clock input (yielding a 1 MHz internal instruction rate), wide operating voltage tolerance of 3.3 V to 5.5 V (the I-grade version), industrial temperature range of -40 °C to +85 °C, low-power CMOS process, and compatibility with the PIC16C5X instruction set. The 18-SOIC package is the industry-standard 7.50 mm wide SOIC footprint, supporting surface-mount assembly on legacy through-hole-replacement boards. Architecturally, the PIC16C54A uses a Harvard memory layout with separate program and data buses, a two-stage pipeline, and 12-bit opcode word width. The CPU has a file-register based data architecture with 32 special-function registers mapped in bank 0. The interrupt-free design relies instead on polled peripherals and software state machines, simplifying deterministic real-time code. Compared to PIC16C54 (original), the "A" silicon revision improves oscillator tolerance and ADC-support readiness, and the "04" speed grade formally rates the device at 4 MHz maximum clock. Typical applications include low-cost consumer appliances, remote-control transmitters, sensor-interface modules, simple timer/counter products, and educational/development kits where a minimal 8-bit MCU suffices. The wide 3.3 V to 5.5 V supply range and industrial temperature make it suitable for both battery-powered and mains-fed industrial control. Because this part is OTP only, it is best chosen where firmware is finalized and volume justifies one-time programming cost. Design consideration: When migrating away from this part, note that the PIC16C5X instruction set is non-upward-compatible with the modern PIC16F1XXX family, so source code must be recompiled. For new designs consider PIC16F54 (Flash, 4 MHz, 18-pin) as a more flexible successor with similar pinout. This page synthesizes distributor pricing, drop-in same-brand PIC16C5X-family alternatives, and practical design notes not included in the manufacturer datasheet summary, providing a single source of information for engineers and procurement teams.

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PIC16C54AT-04I/SS - 8-Bit EPROM MCU, 4MHz, SSOP-20 | Microchip
PIC16C54AT-04I/SS

PIC16C54AT-04I/SS - 8-Bit EPROM MCU, 4MHz, SSOP-20 | Microchip

The Microchip Technology PIC16C54AT-04I/SS is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, operating at a 4 MHz clock input with 200 ns instruction cycle time in a 20-pin SSOP package. The device integrates a RISC CPU core with 33 single-word instructions, 768 bytes of OTP program memory (512 x 12), 25 bytes of general-purpose RAM, and 12 digital I/O pins. It is supplied from a 4.5 V to 5.5 V rail and operates across the industrial temperature range of -40 C to +85 C. The 'A' revision silicon is the most recent mask set of the original PIC16C54 base, and the 'T' suffix indicates tape-and-reel packaging for high-volume SMT assembly. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripheral I/O on one die. The PIC16C5X architecture uses a RISC (Reduced Instruction Set Computer) Harvard design with separate program and data buses, which lets the CPU fetch an instruction and read data in the same cycle. PIC16C5X MCUs belong to the broader hierarchy: microcontroller -> embedded controller -> semiconductor device. The 12-bit-wide instruction word delivers a 2:1 code compression ratio over typical 8-bit CISC competitors of the same era, and OTP (One-Time Programmable) EPROM allows firmware customization during prototyping before committing to masked ROM for mass production. Key features include 33 single-cycle instructions (only program branches are two cycles), 4 MHz maximum clock input, 200 ns instruction cycle, 12 bidirectional I/O pins, an 8-bit timer/counter (TMR0), watchdog timer with on-chip RC oscillator, power-on reset, and brown-out detection. The 12-bit program word and small footprint suit simple control loops where deterministic timing and minimal BOM are critical. Typical applications include low-cost consumer appliances, sensor signal conditioning, battery chargers, LED controllers, and embedded control logic for white goods and industrial automation. The wide 5 V supply tolerance and industrial temperature range allow deployment in factory-floor equipment and automotive under-hood sub-systems. When designing with this device, note that OTP memory cannot be re-programmed in-circuit; use the windowed ceramic UV-erasable PIC16C54 variant for development, then move to OTP for production. The 12 I/O pins share peripherals, so plan pin assignments early. This page combines verified distributor pricing, pin-compatible drop-in alternatives (with same-brand priority), and practical design notes that go beyond the manufacturer datasheet itself.

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PIC16C54AT-10/SO - 8-Bit 10MHz OTP MCU 18-SOIC | Microchip
PIC16C54AT-10/SO

PIC16C54AT-10/SO - 8-Bit 10MHz OTP MCU 18-SOIC | Microchip

The Microchip PIC16C54AT-10/SO is an 8-bit RISC microcontroller from the PIC16C5X family, featuring a 10 MHz clock input, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, and 25 bytes of RAM, housed in a commercial-grade 18-pin SOIC (SO) package. The "T" suffix indicates tape and reel packaging and the "-10" denotes the 10 MHz speed grade. The device operates from 3.0V to 5.5V supply with 12 bidirectional digital I/O pins organized into two 6-bit ports (PORTA, PORTB) and integrates a Watchdog Timer, power-on reset, and code-protection fuse. An 8-bit OTP microcontroller is a single-chip CMOS processor that combines CPU core, non-volatile OTP program memory, working RAM, and peripheral I/O on one die, intended for low-cost embedded control. Within the semiconductor hierarchy, the PIC16C5X sits at the bottom of the Microchip 8-bit PIC portfolio: OTP/EPROM 8-bit MCU -> PIC16C5X family -> PIC16C54A sub-family -> the PIC16C54AT-10/SO. This bottom-tier positioning historically served high-volume cost-sensitive applications where a one-time programmable, low-pin-count, RISC core delivered deterministic 200 ns instruction cycles. Key features of this part include 33 single-word instructions, single-cycle execution except for program branches (which take two cycles, 400 ns), a hardware 8-bit timer/counter (TMR0) with an 8-bit prescaler, a 12-bit instruction word enabling 2:1 code compression versus competing 8-bit CISC architectures, and DC-20 MHz oscillator support. Per the Microchip datasheet, the PIC16C5X delivers an order-of-magnitude higher performance than competing 8-bit MCUs in the same price class. The architecture is fully static CMOS with a Harvard-style bus, supporting DC to 20 MHz operation and 200 ns instruction cycles. Power-down (SLEEP) mode drops quiescent current below 1 µA typical, and the integrated Power-on Reset (POR) and Watchdog Timer (WDT) eliminate external reset circuitry in many designs. Typical applications include appliance controllers, automotive subsystems (non-safety), HVAC damper/valve control, simple sensor signal conditioning, security keypads, and low-end consumer electronics. The wide supply range and robust ESD performance also suit industrial-grade sensor interfaces. The 18-SOIC footprint is footprint-compatible with the PIC16C55/56/57 family for upward migration without PCB rework. When designing with this part, ensure the chosen programmer (e.g., PICSTART Plus, MPLAB PM3, or a third-party gang programmer) supports OTP and that code-protection fuse is configured before volume production. Because OTP memory is one-time programmable, firmware revisions require a new device - budget accordingly. This page synthesizes distributor stock, drop-in same-package alternatives, and engineering design notes not available on a single manufacturer datasheet page.

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PIC16C54AT-10/SS - 8-Bit 10MHz OTP MCU, 768B | Microchip
PIC16C54AT-10/SS

PIC16C54AT-10/SS - 8-Bit 10MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16C54AT-10/SS is an 8-bit RISC microcontroller from the PIC16C5x family, operating at 10 MHz with 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 25 bytes of RAM, housed in a 20-pin SSOP (Shrink Small Outline Package) and tape-and-reel packaged for high-volume SMT assembly. It executes one instruction per 200 ns instruction cycle and supports 12 I/O lines plus 33 single-word instructions with two addressing modes, making it a compact workhorse for cost-sensitive embedded logic replacement. A PIC microcontroller is a Harvard-architecture, RISC-based CMOS microcontroller family originated by General Instrument's microcontroller division and commercialized broadly by Microchip Technology. The PIC16C5x sub-family is the original baseline of 12-bit instruction-width PICs, positioned as an entry-level MCU for simple control loops, glue-logic replacement, and pre-programmed appliance controllers. In the broader taxonomy, PIC MCUs sit within the 8-bit microcontroller category, alongside 8051, AVR, and STM8 families, and are widely recognized for deterministic interrupt response and low per-unit cost. Key features include 33 single-word instructions with two addressing modes (immediate and direct), an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, a Power-on Reset (POR), Device Reset Timer (DRT), Watchdog Timer (WDT) with its own on-chip RC oscillator, and code-protection bit. The device operates from 3.0 V to 5.5 V across the commercial temperature range (0C to +70C) and is housed in a 20-pin SSOP measuring 5.30 mm body width. The 10 MHz speed grade (-10 suffix) limits the oscillator input to 10 MHz maximum, while the 'A' silicon revision brings improved oscillator specifications and lower current consumption versus the legacy PIC16C54 core. Architecturally, the PIC16C54AT-10/SS uses a 12-bit program-word bus to a 512-instruction address space (hence 768 bytes = 512 x 12 bits) and a separate 8-bit data bus to 25 bytes of general-purpose RAM. The two-stack-deep hardware return stack limits subroutine nesting to two levels - a defining constraint of the PIC16C5x baseline. Brown-out detection is not integrated; systems requiring low-Vdd protection should add an external supervisor such as MCP100/MCP101 or use the newer PIC16F54 flash-based equivalent. Typical applications include appliance controllers (rice cookers, washing machines, fan controllers), battery chargers, LED drivers, and remote-control transmitters where 12 I/O pins and 768 bytes of OTP are sufficient. The part is also commonly used as production-volume replacements for 12-18 pin discrete logic ICs, with development performed on UV-erasable PIC16C54 windowed ceramic parts and then ported to the OTP PIC16C54A for the production build. Designers migrating from the original PIC16C54 to this 'A' revision gain improved oscillator tolerance and lower IPD, but must observe the two-level stack limit. For new designs, the flash-based PIC16F54 in the same SSOP-20 footprint is the recommended modern successor with in-circuit programmability, larger code space, and faster speeds. The PIC16C54AT-10/SS remains in production primarily for long-life industrial and appliance customers who standardized on the OTP silicon. This page synthesizes distributor pricing, drop-in alternatives within the SSOP-20 footprint, and practical design notes not found in the manufacturer datasheet alone - including a thermal estimate at full I/O load and explicit stack-depth warnings for engineers porting PIC code from larger PIC families.

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PIC16C54AT-10E/SO - 8-Bit 10MHz OTP MCU 18-SOIC | Microchip
PIC16C54AT-10E/SO

PIC16C54AT-10E/SO - 8-Bit 10MHz OTP MCU 18-SOIC | Microchip

The Microchip Technology PIC16C54AT-10E/SO is an 8-bit OTP (One-Time-Programmable) CMOS microcontroller from the PIC16C5x family, operating at 10 MHz with a 200 ns instruction cycle, packaged in an 18-pin SOIC (SO) with 7.50 mm body width for surface-mount assembly on tape-and-reel. What is a PIC16C5x microcontroller? The PIC16C5x is Microchip's original baseline 8-bit OTP CMOS microcontroller family, widely used in legacy and cost-sensitive embedded applications. It belongs to the hierarchy microcontroller -> 8-bit MCU -> embedded controller -> semiconductor IC. PIC16C5x devices use 12-bit wide instructions that deliver 2:1 code compression versus other 8-bit MCUs in their class and feature a RISC-like instruction set of 33 single-word instructions where every instruction completes in a single cycle (200 ns) except program branches which take two cycles. Key features of the PIC16C54AT-10E/SO include 768 bytes (512 x 12) of OTP program memory, 25 bytes of RAM, 12 general-purpose digital I/O pins arranged across two ports, an external oscillator interface, and a wide 4.5V to 5.5V single-supply operating range. The -10 speed grade denotes a 10 MHz maximum clock input. All I/O lines are bidirectional and individually configurable. The architecture combines a Harvard-style separate program/data bus with a fixed 12-bit instruction width. Because the program memory is OTP, blank devices are factory-shipped unprogrammed and code is written once at production programming time. There is no on-chip debug or in-circuit programming interface on the PIC16C5x family - programming is performed on a device programmer before PCB mounting, which makes the part suited to high-volume fixed-function products rather than field-upgradeable firmware. Typical applications include simple logic replacement in appliance control boards, hobbyist and educational microcontroller projects, fixed-function industrial timers and counters, low-cost LED drivers, sensor interface controllers, and embedded control sub-modules in larger products. The 12-bit compressed instruction set is also a teaching reference for RISC microcontroller fundamentals. When designing with this device, allocate an external oscillator (RC, crystal, or resonator) because the PIC16C54AT-10E/SO has no internal oscillator. OTP memory cannot be erased or rewritten, so use the PIC16F54 flash-based equivalent for prototyping and field updates. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C54AT-10E/SS - 8-Bit 10MHz OTP MCU 768B | Microchip
PIC16C54AT-10E/SS

PIC16C54AT-10E/SS - 8-Bit 10MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54AT-10E/SS is a 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, offering up to 10MHz core clock speed, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, 25 bytes of RAM, and 12 I/O pins in a 20-pin SSOP package. The 'AT' suffix denotes tape-and-reel packaging, '10' indicates 10MHz maximum clock, 'E' denotes the Extended commercial temperature grade, and 'SS' specifies the 20-pin SSOP package. An 8-bit OTP microcontroller is a single-chip computer that integrates CPU, non-volatile program memory (one-time programmable in this case), data RAM, and peripheral I/O on a single die. The PIC16C5X family uses a Harvard architecture with 12-bit-wide instructions that deliver 2:1 code compression over competitors in its class. These microcontrollers serve as cost-effective embedded controllers in applications where the program is finalized at production and never requires field update. Key features include 33 single-word instructions, single-cycle execution (200ns at 10MHz) except for two-cycle program branches, 12-bit instruction width with symmetric instruction set, 8-bit wide data path, 12 I/O pins, 8-bit real-time clock/counter, watchdog timer, power-on reset, and 4.5V to 5.5V single-supply operation. The Extended commercial temperature range supports -40C to +125C operation, enabling deployment in industrial and automotive environments. The PIC16C5X architecture uses a RISC-style instruction set with only 33 instructions to learn, reducing development time. Its CMOS design delivers high performance with low power consumption. The 12-bit instruction format and 8-bit data bus provide an optimal balance between code density and arithmetic capability for control-oriented applications. The 200ns instruction cycle (single-cycle for most instructions) at 10MHz enables responsive control loop execution. Typical applications include industrial control systems, automotive subsystems, white goods and appliance controllers, smart sensor interfaces, simple motor control, remote controls, and consumer electronics where cost-sensitive 8-bit processing is sufficient. The Extended temperature grade and OTP memory make it particularly suited to high-volume, fixed-function, cost-driven designs. When designing with this MCU, ensure the chosen programming tool supports OTP device programming and that the program is finalized before volume production. The internal RC oscillator option eliminates external clock components for cost-sensitive designs, but an external crystal is recommended for timing-sensitive applications requiring precise communication or control loops. This page synthesizes distributor pricing, drop-in same-package and same-family alternatives, application guidance, and design considerations not found in the manufacturer datasheet alone - data points were aggregated from DigiKey, Mouser, MicrochipUSA, and Microchip official sources.

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PIC16C54AT-10I/SO - 8-bit OTP MCU, 10MHz, 768B | Microchip
PIC16C54AT-10I/SO

PIC16C54AT-10I/SO - 8-bit OTP MCU, 10MHz, 768B | Microchip

The Microchip Technology PIC16C54AT-10I/SO is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5x family, delivering up to 10 MHz CPU clock in an 18-pin SOIC wide-body package. It integrates 768 bytes of one-time-programmable (OTP) program memory organized as 512 x 12-bit words, 25 bytes of general-purpose RAM, and 12 digital I/O lines. A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory, working RAM, and configurable peripherals. The PIC16C5x architecture uses a RISC-style Harvard design with a 12-bit-wide instruction word, providing predictable single-cycle execution on most instructions and enabling compact code density roughly twice that of competing 8-bit MCUs of its era. Key features of the PIC16C54AT-10I/SO include a 10 MHz maximum operating frequency, 2.5V to 6.0V supply range (5V typical), Power-On Reset (POR), Watchdog Timer (WDT) with on-chip RC oscillator, and a programmable code-protection bit. The 'I' suffix denotes the industrial -40C to +85C operating temperature range, and the 'A' revision indicates the enhanced silicon with improved peripherals and lower power versus the original PIC16C54. This part targets cost-sensitive embedded applications where deterministic execution, small code footprint, and a familiar PIC ecosystem matter more than raw MIPS. With 33 single-word instructions and a 2-level hardware stack, the PIC16C54A is well suited to glue logic replacement, simple sensor reading, and human-interface tasks in white goods, HVAC controls, and legacy industrial equipment. Typical applications include appliance control boards, simple timer/sequencer modules, low-end keypad/LED front panels, and battery-backed sensor nodes. The 18-SOIC footprint is industry-standard, easing hand-prototyping and field replacement. When designing with the PIC16C54AT-10I/SO, note that OTP memory cannot be reprogrammed in-circuit - for development cycles, choose the PIC16F54 (Flash) or PIC16C54A-JW (windowed EPROM) instead. Always place a 0.1 uF decoupling capacitor within 5 mm of VDD, and ensure the MCLR pin (pin 4) has a valid high-to-low reset pulse at power-up. This page synthesizes distributor pricing, drop-in alternatives in the 18-SOIC footprint, and practical design notes not aggregated in the manufacturer datasheet.

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PIC16C54AT-10I/SS - 8-Bit 10MHz OTP MCU 768B | Microchip
PIC16C54AT-10I/SS

PIC16C54AT-10I/SS - 8-Bit 10MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54AT-10I/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, featuring a RISC architecture with 33 single-word/single-cycle instructions, 10 MHz maximum clock speed, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, and 25 bytes of data RAM, all housed in a 20-pin SSOP package. Its 12-bit wide instruction word delivers 2:1 code compression versus competing 8-bit controllers, and the fully static CMOS design enables low-power operation across an industrial temperature range of -40C to +85C. What is an 8-bit microcontroller? An 8-bit microcontroller (MCU) is a single-chip computer that processes data in 8-bit wide chunks and integrates a CPU, program memory, data RAM, and I/O peripherals on one die. The PIC16C5X family belongs to the broader category of microcontrollers -> RISC microcontrollers -> embedded controllers -> semiconductors. These devices replace discrete logic and reduce BOM cost in cost-sensitive embedded designs where higher-performance ARM Cortex-M parts would be over-spec and more expensive. Key features of the PIC16C54AT-10I/SS include 12 general-purpose digital I/O pins, an on-chip Power-On Reset (POR) circuit, a Watchdog Timer (WDT) for runaway code recovery, and an operating voltage range of 3.0 V to 6.0 V. The 10 MHz oscillator frequency with a 100 ns instruction cycle gives a throughput of approximately 10 MIPS, while the 33-instruction set simplifies code generation and shortens the learning curve for new PIC developers. Architecturally, the PIC16C54A uses a Harvard memory layout with separate program and data buses, allowing instruction fetch and operand access to occur in the same cycle. The OTP program memory (768 bytes organized as 512 x 12-bit words) is written once with a device programmer and is suited for low-to-medium volume production where flash reprogrammability is not required. The SSOP-20 footprint keeps board real-estate small while still accommodating the 12 I/O pins plus VDD, VSS, MCLR, OSC1 and OSC2. Typical applications for the PIC16C54AT-10I/SS include appliance controllers, simple sensor interfaces, LED drivers, low-end remote controls, and educational/hobbyist projects where the OTP memory cost advantage and 33-instruction simplicity outweigh the lack of in-circuit reprogrammability. It is also used as a glue logic replacement in industrial control boards where deterministic cycle timing is required. When designing with this part, note that OTP memory cannot be erased, so firmware must be fully verified before programming. The 12 I/O pins share a common bank with limited sourcing capability, so high-current loads require external transistors or driver ICs. For designs requiring field upgrades, consider a flash-based PIC16F5X counterpart in the same SSOP-20 footprint. This page synthesizes distributor pricing, drop-in alternatives from the PIC16C5X family, and practical design notes not found in the standalone manufacturer datasheet, helping engineers select, source, and qualify the PIC16C54AT-10I/SS quickly.

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PIC16C54AT-20/SO - 8-Bit OTP MCU, 768B, 20MHz, SOIC-18
PIC16C54AT-20/SO

PIC16C54AT-20/SO - 8-Bit OTP MCU, 768B, 20MHz, SOIC-18

The Microchip PIC16C54AT-20/SO is a member of the PIC16C5X EPROM/ROM-based 8-bit CMOS microcontroller family, delivering 0.75 KB of OTP program memory, 25 bytes of RAM, and 12 digital I/O pins in an 18-pin SOIC package. It operates from a 4.5 V to 5.5 V supply and runs the instruction stream at up to 20 MHz (10 MHz input clock divided by 2 internally), placing it in the classic 12-bit-instruction RISC PIC family that pioneered modern 8-bit embedded controllers. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable peripheral I/O into one package. The PIC16C54A sits at the entry level of Microchip's PIC16 lineup, characterised by a RISC instruction set that gives deterministic, single-cycle execution on most opcodes - this is why the part has remained popular in cost-sensitive, low-pin-count embedded designs since the 1990s. Key features include a Harvard architecture with separate program and data buses, 12-bit wide instructions for code density, two 8-bit I/O ports (RA and RB), a watchdog timer, power-on reset, and a programmable code-protection scheme. The "20" suffix marks the 20 MHz maximum oscillator frequency, and the "A" suffix denotes the second-generation silicon revision. The OTP (One-Time Programmable) EPROM memory makes this part ideal for prototypes and small production runs where firmware is finalised before volume ordering. Technical depth: the PIC16C54A uses an external RC or crystal oscillator feeding an internal divide-by-two stage, so a 20 MHz resonator drives a 10 MHz instruction cycle. Its 9-bit program counter (PC) addresses the 512 x 12 OTP array, which is exactly 768 bytes when counted by 12-bit words - the figure most often quoted in distributor tables. Typical applications include appliance control, security-system keypads, simple motor-control logic, and white-goods user-interface boards. Designers choose this part for its predictable RISC core, easy migration path to flash-based PIC16F equivalents, and Microchip's long-term toolchain (MPLAB X IDE, MPASMX assembler). When designing with this MCU, ensure the oscillator is well within the 4.5-5.5 V supply range and budget the OTP write cycle (typically 10 ms) into your production firmware loading. Because OTP cannot be erased, code must be final before programming. This page synthesises distributor pricing, drop-in alternatives from the PIC16C5X family, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C54AT-20/SS - 8-Bit 20MHz OTP MCU, 768B | Microchip
PIC16C54AT-20/SS

PIC16C54AT-20/SS - 8-Bit 20MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16C54AT-20/SS is an 8-bit RISC EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, operating at up to 20 MHz with 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 25 bytes of RAM, housed in a 20-pin SSOP package. The PIC16C54A silicon delivers 33 single-word/single-cycle instructions, 12-bit-wide opcode, and 2:1 code compression over competitive 8-bit MCUs in its class. What is a microcontroller? A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable I/O peripherals. Within that hierarchy, the PIC16C54A sits in the OTP/EPROM-based 8-bit RISC family, below flash-based mid-range PIC16 devices and far below 32-bit Cortex-M class parts. OTP memory is programmed once with a device programmer and cannot be electrically erased, which lowers per-unit die cost versus flash and suits high-volume, fixed-code embedded products. Key features include a fully static CMOS design for low power operation, 12 I/O pins with high-current sink/source capability, an 8-bit real-time clock/counter (RTCC) with 8-bit prescaler, watchdog timer with on-chip RC oscillator for reliable operation, power-on reset, and a commercial temperature grade of 0C to +70C. Power-saving SLEEP mode reduces quiescent current to a few microamps, while internal RC oscillator start-up eliminates external clock components for cost-sensitive designs. The device uses a Harvard architecture with separate program and data buses, providing deterministic single-cycle instruction execution except for two-cycle branches. The 12-bit instruction width is asymmetric versus typical 8-bit cores, allowing most operations to encode both operand and destination in a single word. CMOS EPROM technology gives the part strong ESD and latch-up immunity, supporting industrial environments even though the marketed grade is commercial. Typical applications include appliance controls, security and access systems, automotive sub-systems (non-safety), consumer electronics, and low-end remote-control transmitters where minimum BOM and deterministic timing dominate design priorities. The 20-SSOP package enables high-density PCB layouts, and the 20 MHz clock speed provides adequate throughput for simple state-machine and timing tasks. When designing with the PIC16C54A, keep OTP programming margin in mind: the OTP cell requires a higher VPP than flash, and code changes after deployment are impossible - plan firmware revisions at the prototype stage. For development, use the PIC16C54A JW windowed-ceramic variant or the PIC16F54 flash-based drop-in equivalent for iterative code cycles before committing to the OTP production part. This page synthesizes distributor pricing, same-family same-package drop-in alternatives, and practical design notes for the PIC16C54AT-20/SS that are not consolidated in any single datasheet - including which exact SSOP-20 reel variants, commercial-grade only, can be placed on the same PCB land pattern.

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PIC16C54AT-20E/SO - 8-Bit 20MHz OTP MCU, 768B | Microchip
PIC16C54AT-20E/SO

PIC16C54AT-20E/SO - 8-Bit 20MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16C54AT-20E/SO is an 8-bit RISC microcontroller from the PIC16C5x family, featuring a 20 MHz maximum clock speed, 768 bytes of One-Time-Programmable (OTP) program memory (organized as 512 x 12 words), and 25 bytes of general-purpose RAM, housed in an 18-pin SOIC package with 12 digital I/O pins. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on a single die. The PIC16C5x family is the foundational baseline PIC architecture, with subsequent generations adding more memory, peripherals, and flash memory. OTP microcontrollers sit in the broader hierarchy of microcontroller -> embedded controller -> semiconductor device; OTP variants are programmed once with custom firmware and cannot be erased, making them ideal for high-volume mature products where unit cost dominates. Key features of the PIC16C54AT-20E/SO include a 12-bit instruction word, 33 single-word instruction set, 2-level hardware stack, 8-bit timer/counter (TMR0) with an 8-bit prescaler, and a watchdog timer (WDT) for reliable operation in industrial environments. The device operates from 4.5V to 5.5V and supports commercial temperature range. Power-on Reset (POR), Device Reset Timer (DRT), and an on-chip oscillator with selectable RC/HS/XT/LP modes reduce external component count. Architecturally, the PIC16C5x uses a Harvard-style separate code/data path with a fixed 12-bit instruction width, enabling deterministic single-cycle instruction execution except for program branches. The "20" speed suffix denotes a 20 MHz oscillator / 5 MHz instruction cycle (4:1 clock-to-instruction divider), while "E" indicates the Extended temperature variant and "T" denotes Tape & Reel packaging. Typical applications include simple logic replacement, low-cost consumer appliances, sensor conditioning front-ends, LED sequencing controllers, and battery chargers. The 18-SOIC package is a JEDEC-standard small-outline footprint, compatible with hand-soldering and standard SMT reflow lines. When designing with this device, note that the PIC16C5x family does not support interrupts - all event handling is polled. Program memory is OTP, so firmware must be fully validated before programming. Use MPLAB X IDE with the MPASM assembler or XC8 compiler for firmware development. This page synthesizes distributor pricing, drop-in alternative cross-references, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C54AT-20I/SO - 8-bit OTP MCU, 20MHz, 12 I/O | Microchip
PIC16C54AT-20I/SO

PIC16C54AT-20I/SO - 8-bit OTP MCU, 20MHz, 12 I/O | Microchip

The Microchip Technology PIC16C54AT-20I/SO is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 20 MHz maximum clock speed, 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, and 25 bytes of RAM in an 18-pin SOIC package. It is a member of the PIC® 16C mid-range baseline architecture with a 12-bit instruction word, providing 2:1 code compression versus other 8-bit microcontrollers in its class. An OTP microcontroller is a type of embedded processor whose program memory can be written exactly once by the user using a programming device, after which the bit pattern is permanent. The PIC16C5X family occupies a specific position in the embedded taxonomy: 8-bit microcontroller -> PIC baseline architecture -> Microchip PIC16C family -> EPROM/ROM-based OTP MCU -> industrial/legacy embedded control. Baseline PIC microcontrollers are widely used where deterministic behaviour, low cost, and a small instruction set are more important than large memory or modern peripherals. Key features of the PIC16C54AT-20I/SO include 12 digital I/O lines, a Power-on Reset (POR), a Watchdog Timer (WDT) with its own on-chip RC oscillator, a programmable 8-bit timer/counter, and 4.5 V to 5.5 V single-supply operation. The CMOS process delivers low power consumption, and the fully static design allows the clock to be stopped without losing register contents. The 18-pin SOIC (0.295 inch / 7.50 mm width) package is suitable for through-hole-style hand prototyping and for reflow soldering on industrial control boards. This part is specified for the industrial temperature range (-40 C to +85 C, indicated by the 'I' suffix), uses a 12-bit program memory width with 512 instruction words of EPROM storage, and supports the standard PIC16C5X instruction set with two addressing modes and 33 single-word instructions. The architecture exposes the accumulator-based W register, the real-time clock counter, and the standard PORTA/PORTB I/O structure used across the PIC16C5X family. Typical applications include appliance controllers, simple sensor interfaces, automotive sub-system modules, remote control transmitters, security keypads, battery chargers, and small motor-control boards. The PIC16C54AT-20I/SO is well suited to designs that need reliable baseline performance without the overhead of flash memory or advanced peripherals, especially where legacy firmware migration or cost-sensitive production runs are required. When designing with this part, ensure that programming current and timing match the OTP programming algorithm described in the Microchip PIC16C5X programming specification, and provide adequate Vdd decoupling close to the IC. Because this is an OTP device, firmware must be fully validated before programming - there is no way to re-flash in-circuit. The Watchdog Timer should be enabled in any application where the MCU may be exposed to ESD or supply transients. This page synthesises distributor stock levels, parametric data, drop-in same-package alternatives, and engineering design notes that are not presented together in the manufacturer datasheet, with values verified against Microchip's published specification.

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PIC16C54AT-20I/SS - 8-Bit 20MHz OTP MCU, 20-SSOP | Microchip
PIC16C54AT-20I/SS

PIC16C54AT-20I/SS - 8-Bit 20MHz OTP MCU, 20-SSOP | Microchip

The Microchip Technology PIC16C54AT-20I/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X series, housed in a 20-pin SSOP package and qualified to the -40C to +85C industrial temperature range. It combines a 20 MHz core clock with a 200 ns single-cycle instruction execution path and 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory. The 'T' suffix indicates tape-and-reel packaging, the 'I' indicates industrial temperature grade, and the '/SS' indicates the 20-pin SSOP package. An 8-bit OTP microcontroller is a single-chip computer that integrates a CPU, RAM, ROM/EPROM program memory, and peripherals on one die. Compared with mask-ROM microcontrollers, OTP parts allow small-batch programming during prototyping and pre-production, while keeping unit cost low for low-volume production runs. The PIC16C54 sits at the bottom of the PIC family hierarchy: PIC16C54 -> PIC16C5X -> PIC microcontroller family -> 8-bit MCU -> microcontroller -> semiconductor IC. Its RISC-style instruction set contains only 33 single-word instructions, with single-cycle execution except for program branches. Key features include a RISC architecture with 33 single-word instructions, 12-bit-wide instructions yielding 2:1 code compression versus competing 8-bit MCUs, 25 bytes of general-purpose RAM, 12 I/O pins with independent direction control, an 8-bit timer/counter with 8-bit programmable prescaler, power-on reset, watchdog timer, and code protection. The device operates from 2.5V to 5.5V and consumes low operating current, making it well suited to battery-powered and space-constrained designs. The PIC16C54 uses a Harvard architecture with separate program and data buses, allowing instruction fetch and data access to occur in parallel. Its OTP program memory is programmed via Microchip's standard ICSP interface and cannot be erased or rewritten, which differentiates it from flash-based PIC16F parts that share the same pinout. The 12-bit instruction word is asymmetric compared to typical 8-bit CISC controllers, yielding denser code and faster execution per MHz. Typical applications include low-cost embedded controllers, appliance control, simple sensor interfaces, automotive body electronics sub-modules, security and access peripherals, and remote-control transmitters. Its compact SSOP footprint and industrial temperature range suit space-constrained designs that must operate reliably in harsh environments. When designing with the PIC16C54AT-20I/SS, choose the OTP variant carefully: OTP is one-time programmable and unsuitable for firmware updates, so any code-change requirement would force a board rework. For designs that may need firmware revision, migrate to a flash-based pin-compatible PIC16F54 or similar part with the same SSOP-20 footprint. This page synthesizes verified distributor pricing, a curated list of drop-in same-package alternatives, and practical design notes - including a frank explanation of the OTP-vs-Flash trade-off - that are not always visible on a single manufacturer datasheet page.

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PIC16C54C-04/P - 8-Bit OTP MCU 4MHz 768B | Microchip PDIP-18
PIC16C54C-04/P

PIC16C54C-04/P - 8-Bit OTP MCU 4MHz 768B | Microchip PDIP-18

The Microchip Technology PIC16C54C-04/P is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5x family, featuring 4 MHz maximum clock speed, 768 bytes of One-Time-Programmable (OTP) program memory (512 x 12 words), and 25 bytes of data RAM in a 18-pin PDIP (P) through-hole package. It is a fully static RISC design with 33 single-word/single-cycle instructions, a two-level hardware stack, and 12 bidirectional I/O pins supporting direct, indirect, and relative addressing modes. What is an 8-bit OTP microcontroller? An 8-bit microcontroller is a small computing IC that processes 8-bit data words and is typically used for embedded control. OTP (One-Time-Programmable) memory can be written once and then becomes read-only, making these parts cost-optimized for high-volume production runs where firmware is finalized. The PIC16C5x sits in the hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> RISC architecture -> CMOS semiconductor, and is widely regarded as the ancestor of the modern PIC10/12/16/18 families that dominate hobbyist and industrial 8-bit designs today. Key features of the PIC16C54C-04/P include a 4 MHz internal oscillator operation (the -04 speed grade), 4.5 V to 5.5 V single-supply operation, a 12-bit instruction word with 2:1 code compression versus competing 8-bit MCUs in its class, and an 8-bit real-time clock/counter (TMR0). The device offers seven special function hardware registers, a watchdog timer, and Power-on Reset, while the EPROM-based program memory allows prototype iteration before committing to ROM-masked production parts. Technically, the PIC16C54C-04/P uses a Harvard bus architecture with separate program and data paths, enabling single-cycle instruction execution except for program branches. The 33-instruction RISC set is highly orthogonal and easy to learn, and the device is fully static, meaning the clock can be stopped without losing register state - useful for low-power designs. Typical applications include low-cost consumer appliances, automotive sub-system controllers, security and access control panels, simple sensor interfaces, LED display drivers, and battery chargers. Its through-hole PDIP-18 form factor also makes it attractive for educational kits, hobby projects, and legacy equipment maintenance where socketed parts simplify field replacement. When designing with this part, note that the -04 speed grade limits the oscillator to 4 MHz. For designs requiring higher throughput, the PIC16C54C-20/P (20 MHz) is pin-compatible. Designers should also confirm whether OTP is acceptable for the application: if in-circuit reprogrammability is needed, migrate to a Flash-based PIC12F or PIC16F family member in a compatible footprint. This page consolidates verified distributor pricing, drop-in same-brand and cross-brand alternatives, and practical design notes that are not gathered in one place in the Microchip datasheet.

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PIC16C54C-04/SO - 8-Bit OTP MCU 4MHz 768B | Microchip
PIC16C54C-04/SO

PIC16C54C-04/SO - 8-Bit OTP MCU 4MHz 768B | Microchip

The Microchip Technology PIC16C54C-04/SO is an 8-bit CMOS one-time-programmable (OTP) microcontroller from the PIC16C5x baseline family, delivering 4 MIPS performance at 4 MHz clock in an 18-pin SOIC package. It integrates 768 bytes (512 × 12) of OTP program memory, 25 bytes of general-purpose RAM, and 12 digital I/O pins, and operates from a 3.0 V to 5.5 V supply across the commercial 0 °C to 70 °C temperature range. The '04' speed grade denotes 4 MHz maximum oscillator input, and the 'C' suffix indicates the enhanced CMOS silicon revision with lower power and improved ESD performance over the original PIC16C54. What is a baseline 8-bit OTP microcontroller? A baseline PIC microcontroller (PIC16C5x) is the simplest tier of Microchip's 8-bit PIC family, characterized by 12-bit-wide instructions, an 8-bit data path, a two-level hardware stack, and direct/indirect/relative addressing modes. OTP microcontrollers (programmed once via EPROM-like cells) are positioned below Flash-based mid-range PICs in the taxonomy: OTP EPROM microcontroller -> baseline 8-bit PIC -> PIC microcontroller -> 8-bit microcontroller -> microcontroller -> embedded processor -> semiconductor. They remain relevant where unit cost dominates over reprogrammability and where firmware is finalized at production time. Key features include 33 single-word instructions, single-cycle instruction execution except for program branches, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, a watchdog timer with on-chip RC oscillator, power-on reset, and a 12 I/O pin package with high-current sink/source capability. The device includes four oscillator options (RC, XT, HS, LP) selected by configuration fuse, and offers brown-out and code-protection fuses as part of the configuration word. Each I/O pin can source up to 25 mA, supporting direct LED drive. Technically, the PIC16C54C-04/SO uses a Harvard architecture with separate program and data buses, an ALU with a 12-bit-wide instruction word and 8-bit data bus, and a 7- or 8-register file mapped across two banks. The instruction pipeline overlaps fetch and execute for most instructions, achieving single-cycle throughput. An external RC or crystal oscillator feeds the internal clock; the oscillator type is factory-configured rather than runtime-selected. The OTP program memory is accessed via a 12-bit PC sufficient for the 512-word address space. Typical applications include appliance control boards, low-end consumer electronics, simple sensor interface boards, LED display drivers, and replacement of discrete logic in cost-sensitive embedded designs. The 12 high-current I/O pins and small footprint make it well suited to drive 7-segment displays, relay coils, and small buzzer interfaces directly. When designing with the PIC16C54C-04/SO, note that OTP memory cannot be re-programmed in-circuit; plan for a windowed UV-erasable ceramic DIP (JW) variant during firmware development. Decoupling should include a 0.1 µF ceramic capacitor close to VDD with a bulk electrolytic at the board input to suppress motor-induced transients. The absence of an on-chip debug interface requires emulation via the ICEPIC in-circuit emulator or a known-good programmed device. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C54C-04/SS - 4MHz 8-bit CMOS OTP MCU, 768B | Microchip
PIC16C54C-04/SS

PIC16C54C-04/SS - 4MHz 8-bit CMOS OTP MCU, 768B | Microchip

The Microchip PIC16C54C-04/SS is an 8-bit CMOS EPROM/ROM-based microcontroller from the PIC16C5x family operating at 4 MHz, with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory and 25 bytes of RAM, housed in a 20-pin SSOP package. It provides 12 I/O pins, a two-level hardware stack, and an 8-bit real-time clock/counter (TMR0), integrating a RISC-like instruction set with 12-bit-wide instructions and an 8-bit data path. What is a PIC16C5x microcontroller? The PIC16C5x series is Microchip Technology's baseline family of 8-bit CMOS microcontrollers that launched the PIC architecture. It belongs to the broader hierarchy: microcontroller -> embedded microcontroller -> 8-bit MCU -> CMOS RISC MCU -> PIC architecture. These parts use One-Time-Programmable (OTP) EPROM program memory, distinguishing them from later PIC16F flash parts that allow in-circuit reprogramming. The PIC16C5x family remains widely deployed in cost-sensitive, high-volume, single-purpose applications such as appliance controls and consumer electronics. Key features of the PIC16C54C include 12 I/O pins, 768 bytes of OTP program memory, 25 bytes of data RAM, two-level deep hardware stack, and seven or eight special function hardware registers. It supports direct, indirect, and relative addressing modes for both data and instructions, and operates across a 2.5V to 5.5V supply range (commercial temperature grade). The 4 MHz maximum clock frequency and 1 microsecond instruction cycle make it well-matched to simple real-time control loops. Architecturally, the PIC16C54C uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand access to occur in the same instruction cycle. The 12-bit instruction word is symmetrical and highly orthogonal, typically delivering close to 2:1 code compression versus other 8-bit microcontrollers in its class. The OTP EPROM program memory requires a high-voltage programming pulse (typically 13V) and cannot be erased, so firmware must be verified externally before programming. Typical applications include appliance controls, security system peripherals, simple sensor interfaces, low-end consumer products, and legacy industrial timers where the 4 MHz clock and OTP one-time programming provide the simplest possible bill of materials. New designs generally migrate to PIC16F5x flash parts (e.g. PIC16F54) for in-circuit reprogrammability, but the PIC16C54C remains a strong choice for high-volume, cost-optimized production. When designing with the PIC16C54C-04/SS, ensure the oscillator configuration matches the target frequency (RC, XT, LP, or HS mode) and respect the OTP programming voltage requirement of approximately 13V on the MCLR/VPP pin. Because the program memory is OTP, plan for firmware verification using windowed or sample parts before committing to the SSOP production units. SSOP package selection enables compact PCB layouts but requires careful handling during PCB assembly due to the fine 0.65 mm pitch. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet alone, enabling faster sourcing decisions for engineers maintaining legacy designs or planning cost-optimized new products.

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PIC16C54C-04E/P - 8-Bit OTP MCU, 4MHz, 768B ROM | Microchip
PIC16C54C-04E/P

PIC16C54C-04E/P - 8-Bit OTP MCU, 4MHz, 768B ROM | Microchip

The Microchip Technology PIC16C54C-04E/P is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, featuring 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, 25 bytes of RAM, and 12 I/O pins, all housed in an 18-pin PDIP through-thong package. It operates at a clock speed of 4 MHz with an instruction cycle time of 1 microsecond, drawing its supply from a 4.5 V to 5.5 V rail. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral I/O on one die. The PIC16C5X family uses a RISC-based Harvard architecture with 12-bit-wide instructions and a 33-instruction set, delivering about 2:1 code compression over other 8-bit microcontrollers in its class. OTPs are a sub-category of microcontrollers programmed once by the user or factory, suited to low-to-mid volume production. PIC MCUs sit inside the broader taxonomy: microcontroller -> embedded processor -> semiconductor IC. Key features include 12 bidirectional I/O pins, a watchdog timer, power-on reset, and an operating temperature range of -40 C to +125 C (the 'E' suffix designates extended commercial). The device has a maximum supply current of approximately 11 mA at 5 V and 4 MHz, plus a low standby current for battery-friendly applications. Four oscillator options (RC, LP, XT, HS) make it adaptable to cost-sensitive or timing-critical designs. Architecturally, the PIC16C54C employs a two-stage pipeline with a single accumulator (W register) and a hardware stack of two levels, eliminating context-save overhead typical of larger MCUs. The OTP program memory array is implemented using Microchip's proprietary EPROM cell, allowing windowless, one-time programming via standard parallel programmers. Typical applications include appliance controllers, simple sensor interfaces, LED driving, remote keyless entry transmitters, automotive body controllers (with PIC16C54C-04E/P-Q1 for AEC-Q100), and general-purpose logic replacement where deterministic response times and small code footprint matter more than connectivity or analog features. When designing with this device, reserve the upper 12 bytes of the 512-word program memory for the user ID and configuration fuse word, leaving 500 usable instructions for application code. A current-limiting resistor on MCLR is also recommended to protect the programming voltage during in-system programming cycles. This page synthesizes distributor stock levels, OTP vs Flash alternatives, and practical design notes not always included in the manufacturer datasheet, helping engineers decide when to specify the PIC16C54C-04E/P versus a newer Flash MCU.

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PIC16C54C-04E/SO - 4MHz 8-bit OTP MCU, 18-SOIC | Microchip
PIC16C54C-04E/SO

PIC16C54C-04E/SO - 4MHz 8-bit OTP MCU, 18-SOIC | Microchip

The Microchip PIC16C54C-04E/SO is an 8-bit RISC microcontroller from the PIC16C5x family, featuring 768 bytes (512 x 12) of One-Time-Programmable (OTP) EPROM program memory and 25 bytes of general-purpose RAM. Housed in an 18-pin SOIC (Small-Outline IC) package, this device operates from a 3.0V to 5.5V supply and executes instructions at up to 4MHz (the "04" speed grade) with the "-E" extended commercial temperature grade of -40C to +125C, making it suitable for industrial and harsh-environment applications. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O on one die. The PIC16C5x family is built on a 12-bit instruction-word RISC architecture and belongs to the broader category of 8-bit microcontrollers, which occupy the lowest tier of the embedded computing hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. The PIC16C5x delivers 12-bit wide instructions that are highly symmetrical, yielding 2:1 code compression over other 8-bit microcontrollers in its class, and provides 12 digital I/O pins split across Ports A (5 pins) and B (8 pins). Key specifications include a 2-stack hardware subroutine stack, 33 single-word instructions, a 2.0 us instruction cycle at 4MHz oscillator, and four interrupt sources. The OTP EPROM permits one-time field programming - the die is windowless, so code is permanent after programming. Watchdog timer with on-chip RC oscillator, power-on reset, and code-protection bit are integrated, and the device supports In-Circuit Serial Programming (ICSP) via RB6/RB7. Power-saving SLEEP mode drops quiescent current below 1 uA typical. The PIC16C5x architecture uses a Harvard design with separate program and data buses, allowing instruction fetch and operand access in a single cycle. The device has 12 I/O pins with 25 mA sink/source capability per pin, suitable for directly driving LEDs and small relays. Compared with PIC16C54A revision parts, the PIC16C54C adds a higher-density 768-byte EPROM and improved ESD performance, while preserving the legacy 12-bit instruction set and 18-pin pinout for source compatibility. Typical applications include appliance control, HVAC fan control, simple sensor interfaces, remote-control transmitters, automotive body electronics, and battery-powered consumer devices where code space is small and the BOM must be low cost. The extended temperature grade makes the -E suffix suitable for under-hood automotive subsystems and outdoor industrial sensor nodes. When designing with the PIC16C54C-04E/SO, budget the 4MHz oscillator budget carefully: instruction cycle is 1/4 of Fosc, leaving 1 us per instruction at 4MHz. Place a 0.1 uF decoupling capacitor within 5 mm of VDD, and a bulk 10 uF tantalum or aluminum capacitor on the supply rail. Configure unused I/O pins as outputs to minimize SLEEP current draw. This page synthesizes distributor pricing, drop-in same-package alternatives, comparison parameters, and practical design notes not found in the manufacturer datasheet alone, giving engineers a faster path to a validated BOM.

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