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PIC16C54-LPI/SS

PIC16C54-LPI/SS - 8-bit EPROM MCU, 12 I/O, SSOP-20 | Microchip

The Microchip PIC16C54-LPI/SS is an 8-bit EPROM/ROM-based CMOS microcontroller belonging to the PIC16C5X family, housed in a 20-pin SSOP package. It integrates 768 bytes (0.75 KB) of program memory and 25 bytes of RAM, alongside 12 general-purpose I/O pins. The device operates from a 2.5V to 6.25V supply and is rated for the industrial temperature range of -40 °C to +85 °C, as confirmed by distributor data. The "LP" suffix indicates the low-power variant designed for battery-friendly applications, and the "I" suffix denotes the industrial temperature grade. A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, data RAM, and programmable I/O peripherals. The PIC16C5X family uses a RISC architecture with only 33 single-word/single-cycle instructions, giving it a 2:1 code compression advantage over competing 8-bit MCUs in the same price category. Within the broader taxonomy, this places the PIC16C54 as a micro-controller -> embedded processor -> semiconductor device. Its Harvard-style separate program/data buses and 12-bit wide instruction word allow deterministic single-cycle execution of most opcodes. Key features include a 12-bit instruction word, an 8-bit data path, two-level hardware stack, an 8-bit real-time clock/counter (TMR0), and direct/indirect/relative addressing modes. Seven or eight special-function hardware registers support rapid context save/restore. The device has a maximum clock speed of 40 MHz, providing up to 10 MIPS instruction throughput. As an OTP (one-time programmable) EPROM-based part, the PIC16C54-LPI/SS is well suited to legacy, low-cost, low-volume embedded designs where Flash reprogrammability is not required. Typical applications include industrial controllers, simple sensor interfaces, appliance control boards, LED driving circuits, hobbyist projects, and replacement of older discrete logic in legacy systems. Because of its small footprint and ultra-low cost, it remains common in mature designs and educational kits where deterministic execution and minimal BOM are priorities. When designing with the PIC16C54-LPI/SS, ensure your programmer supports OTP/EPROM devices (e.g., MPLAB PM3) and provide adequate decoupling (typically 0.1 µF) close to VDD. As an OTP device, code must be committed at production time; consider PIC16F54 if in-field Flash reprogrammability is required. This page synthesizes distributor pricing, drop-in SSOP-20 alternatives from the same PIC16C5X family, and practical design considerations not found in the bare manufacturer datasheet.

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PIC16C54-RC/P

PIC16C54-RC/P - 8-Bit 4MHz OTP MCU, 12 I/O | Microchip

The Microchip Technology PIC16C54-RC/P is an 8-bit CMOS microcontroller in the PIC16C5x family, offering 4MHz CPU clock, 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, and 25 bytes of RAM in a 18-pin PDIP (0.300", 7.62mm) through-hole package. The "RC" suffix denotes the on-chip oscillator type that uses an external resistor/capacitor network, while the "/P" suffix indicates the PDIP package. An 8-bit microcontroller (MCU) is a single-chip computer containing a CPU, memory (ROM/RAM), and programmable I/O peripherals on one integrated circuit. The PIC16C5X family from Microchip Technology is a low-cost, high-performance, fully static, EPROM/ROM-based 8-bit CMOS microcontroller family employing a RISC architecture with only 33 single-word/single-cycle instructions. These devices belong to the broader semiconductor hierarchy: microcontroller -> embedded MCU -> integrated circuit -> semiconductor device. Key features include 12 digital I/O pins, an 8-bit timer/counter, a 4MHz internal oscillator (RC type), watchdog timer, power-on reset, and 12-bit-wide instruction words that provide 2:1 code compression over other 8-bit microcontrollers in its class. The RISC Harvard architecture separates program and data memory, enabling simultaneous instruction fetch and data access for faster execution. The PIC16C54-RC/P operates from a single 3.0V to 6.0V supply, drawing only a few milliamps of active current and supporting power-saving SLEEP mode. Typical applications include low-cost embedded control, sensor interfacing, appliance controllers, automotive body electronics, hobbyist projects, and legacy industrial control replacement. The 12 I/O lines and 768-byte OTP program memory provide sufficient headroom for simple state-machine and I/O-scanning applications such as keypad scanners, LED drivers, and small motor controllers. When designing with this MCU, account for OTP memory (one-time programmable only; not re-programmable in-circuit). Use the MPLAB PM3 or equivalent programmer for code load. Verify the RC oscillator component values against Vdd for reliable clock startup across operating temperature. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C54-RC/SO

PIC16C54-RC/SO - 8-bit OTP MCU, 4MHz, 12 I/O | Microchip

The Microchip Technology PIC16C54-RC/SO is an 8-bit RISC CMOS microcontroller built on the PIC16C5x core, delivering 4 MHz maximum clock speed with 768 bytes (512 x 12 words) of One-Time-Programmable (OTP) program memory in an 18-pin SOIC package. It exposes 12 general-purpose I/O pins, offers 25 bytes of RAM, and operates from a 3.0 V to 5.5 V supply. The architecture uses a 12-bit wide instruction word with only 33 single-word/single-cycle instructions, providing roughly 2:1 code compression versus competing 8-bit microcontrollers in the same price tier. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (ROM/RAM), and programmable I/O. The PIC16C5X family belongs to the OTP/EPROM-based 8-bit RISC microcontroller category, sitting within the broader taxonomy of microcontrollers -> embedded microprocessors -> semiconductor ICs. It is widely used in cost-sensitive, low-power embedded applications where deterministic instruction timing and small code footprints matter more than raw arithmetic throughput. Key features of the PIC16C54-RC/SO include a fully static CMOS design that allows the clock to be slowed or stopped without losing register state, a programmable watchdog timer with on-chip RC oscillator for reliable operation, and an internal power-on reset circuit. The 12 I/O pins each support independent direction control, and the device consumes only a few milliamps at 4 MHz - ideal for battery-powered or always-on appliances. The OTP program memory supports one-time field programming via Microchip's PM3 or earlier universal programmers, and the device is offered in commercial 0C to +70C temperature grade. Architecturally, the PIC16C5x uses a Harvard-style separate program/data bus, two-stage pipelined fetch/decode, and a 5-level deep hardware stack. The 12-bit instruction width is wide enough to embed literal operands directly, eliminating most multi-word instructions. This RISC-style design yields deterministic 250 ns instruction cycle time at 4 MHz, which simplifies real-time control loop design versus accumulator-based 8-bit MCUs. Typical applications include appliance control (rice cookers, washing machines, microwave ovens), remote-control transmitters, LED display drivers, simple sensor interface boards, and hobbyist or educational embedded projects. The wide 3.0 V-5.5 V supply range suits both 3.3 V logic and legacy 5 V systems. For new designs, consider PIC16F54 (flash-based) as the modern equivalent; PIC16C54-RC/SO is recommended for legacy board replacements, cost-sensitive high-volume designs, or products where OTP suffices for production programming. A key design tip: OTP memory cannot be reprogrammed - engineers must commit code to the device exactly once using a supported programmer, so verify firmware thoroughly in a flash-based equivalent (e.g. PIC16F54) before committing to production. Also note that the 'RC' suffix indicates the oscillator selection, so confirm pin assignments against the datasheet when migrating from XT or HS variants. This page synthesizes distributor pricing, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet alone, giving engineers a single reference for sourcing, replacement, and board-level integration.

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PIC16C54-RC/SS

PIC16C54-RC/SS - 8-bit OTP MCU, 4MHz RC Osc, SSOP-20 | Microchip

The Microchip Technology PIC16C54-RC/SS is an 8-bit, fully-static, EPROM/ROM-based CMOS microcontroller from the foundational PIC16C5X family, housed in a 20-pin SSOP (5.30 mm body) package. It integrates 0.75 KB (512 x 12) of one-time-programmable (OTP) program memory, 25 bytes of RAM, and 12 general-purpose I/O lines, while operating at a maximum clock frequency of 4 MHz from a 4.0 V to 6.0 V supply. The 'RC' suffix designates an internal/external RC oscillator variant, which trades absolute frequency accuracy for the lowest cost and simplest BOM. What is a microcontroller? A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/EPROM), working memory (RAM), and configurable I/O peripherals. An 8-bit MCU like the PIC16C54 executes instructions on 8-bit-wide data with a 12-bit instruction word, combining deterministic timing with extremely low cost. MCUs sit in the broader hierarchy of embedded computing alongside microprocessors and SoCs, serving as the always-on logic brain for appliances, sensors, and control loops. Key features include 33 single-word, single-cycle RISC instructions (most execute in 200 ns at 20 MHz equivalent), a two-level-deep hardware stack, and seven or eight special function hardware registers. The 8-bit Timer0 (TMR0) with an 8-bit prescaler provides deterministic event timing, while direct, indirect, and relative addressing modes cover most control-flow patterns. Power-fail reset, watchdog timer, and code-protection features are available across the family. Architecturally, the PIC16C54 uses a Harvard-style RISC core with separate program and data buses, giving it a 2:1 code-compression advantage over competing 8-bit CISC MCUs in its class. The 12-bit instruction word keeps opcode fetch and execution in one clock cycle. The device is fabricated on a low-power CMOS process, and its fully-static design allows the clock to be stopped without losing register state. Typical applications include low-cost consumer appliances, simple sensor interfaces, RC-servo/IR remote-control transmitters, and disposable medical or industrial controllers where price dominates the BOM. The 0 to 70 °C commercial temperature range and SSOP-20 footprint suit compact through-hole-free assemblies on consumer-grade PCBs. When designing with this part, derate the RC oscillator's frequency tolerance (typically ±5 to ±10 % over temperature and voltage) against any timing-sensitive function, or step up to an 'XT' or 'HS' crystal variant. OTPs cannot be reprogrammed, so verify firmware on a JW-windowed or ICE device before committing to the production OTP. This page synthesizes distributor pricing, drop-in same-package alternatives, parametric comparison, and practical design notes not consolidated in the manufacturer datasheet.

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PIC16C54-RCE/SO

PIC16C54-RCE/SO - 8-bit OTP MCU, 4MHz, 768B ROM, SOIC-18 | Microchip

The Microchip PIC16C54-RCE/SO is a member of the PIC16C5X family of low-cost, high-performance, 8-bit fully-static EPROM/ROM-based CMOS microcontrollers. It integrates 768 bytes (512 x 12) of one-time-programmable (OTP) program memory, 25 bytes of RAM, and 12 I/O pins in an 18-pin SOIC package. The device operates from a 4 MHz RC-oscillator-compatible clock input and supports a single 5 V supply with an extended industrial temperature range of -40C to +125C. An 8-bit microcontroller (MCU) is a small computing system on a single integrated circuit that combines a CPU, RAM, ROM/Flash, I/O peripherals, and timers in one package. Microcontrollers sit in the semiconductor hierarchy as: microcontroller -> embedded processor -> integrated circuit -> semiconductor. The PIC16C5X family is one of the earliest RISC-architecture 8-bit MCUs and remains popular in cost-sensitive and high-volume designs where predictable behavior and ultra-low power are essential. The PIC16C54 executes 33 single-word instructions, all single-cycle (200 ns) except program branches which take two cycles, giving a deterministic instruction throughput ideal for interrupt-driven and tight-loop control tasks. Its Harvard memory architecture separates program and data paths to maximize throughput. Brown-out and watchdog options are device-dependent; the OTP variant allows factory or field one-time programming through Microchip device programmers. Architecturally, the PIC16C54 employs a 12-bit instruction word, an 8-bit data path, two stack levels for subroutine nesting, and a power-on reset (POR) circuit. The internal RC oscillator option (denoted 'RC') simplifies designs by eliminating an external crystal; the 'E' suffix in RCE denotes the extended-temperature grade and 'C' indicates the CMOS process. These features balance silicon area, deterministic timing, and ultra-low quiescent current for battery-tolerant applications. Typical applications include remote controls, automotive sub-system controllers, sensor signal conditioning, simple closed-loop PID control, low-end consumer appliances, and battery-powered instrumentation. Designers choose the PIC16C54-RCE/SO when code density, deterministic interrupt latency, and small footprint are critical. When laying out the PCB, place VDD/VSS decoupling capacitors (0.1 uF ceramic) within 5 mm of the supply pins and keep the MCLR pin trace short. For new designs, Microchip recommends evaluating the pin-compatible PIC16F54 flash MCU to avoid OTP obsolescence risk. This page synthesizes distributor pricing, drop-in alternatives within the PIC16C5X family, and practical design notes that are not consolidated in the manufacturer datasheet alone.

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PIC16C54-RCE/SS

PIC16C54-RCE/SS - 8-Bit 4MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54-RCE/SS is an 8-bit EPROM/OTP-based CMOS microcontroller in the PIC16C5X family, delivering 4 MIPS performance at 4 MHz from a 512 x 12 (768-byte) one-time-programmable program memory in a 20-pin SSOP package. It operates from 3.25V to 6V supply across an industrial -40C to +125C temperature range and supports external oscillator clocking via the OSC1/OSC2 pins. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and peripheral I/O. The PIC16C5X family belongs to Microchip's original 8-bit PIC architecture hierarchy (PIC10/12/16/18 -> 8-bit PIC -> RISC microcontroller -> embedded MCU), built on a Harvard RISC architecture with only 33 single-word/single-cycle instructions. This compact instruction set delivers deterministic timing and small code size, distinguishing it from accumulator-based CISC microcontrollers of the same era. Key features include 25 bytes of general-purpose RAM, 12-bit-wide instructions for 2:1 code compression over competing 8-bit MCUs, an 8-bit timer/counter with optional prescaler, a Watchdog Timer with on-chip RC oscillator for reliable operation, and power-saving SLEEP mode. The OTP (One-Time Programmable) memory enables low-volume prototyping and production runs. The device is well suited for low-cost, high-volume embedded applications such as consumer electronics, simple appliance control, automotive sub-systems, and industrial timer/counter designs where deterministic response and minimal component count matter more than raw performance. Design considerations include power-supply decoupling with a 0.1uF ceramic capacitor close to VDD, ensuring VSS and VDD rails are properly routed, and selecting a clock source that meets the application's timing accuracy requirements. Note that this part is in the legacy OTP line; Microchip recommends the flash-based PIC16F54 as the modern successor.

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PIC16C54-RCI/SS

PIC16C54-RCI/SS - 8-bit 4MHz 768B OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16C54-RCI/SS is an 8-bit EPROM/ROM-based CMOS microcontroller in the PIC16C5x family, housed in a 20-pin SSOP (SS) package. It integrates 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, a 4 MHz internal/external oscillator option, and 25 bytes of RAM, delivering compact deterministic control in cost-sensitive embedded designs. Per the DigiKey listing, the device supports a 4 MHz instruction rate through its 12-bit-wide instruction word and operates across the standard PIC16C5x voltage and temperature ranges. A PIC microcontroller (Peripheral Interface Controller) is a Harvard-architecture 8-bit MCU family that uses a separate program and data bus, enabling most instructions to execute in a single instruction cycle. PIC16C5x devices sit at the foundation of Microchip's 8-bit portfolio, predating the flash-based PIC16F5x line, and are historically used in simple logic-replacement, timer, sensor-interface, and consumer-control applications where low cost and small footprint outweigh reprogrammability. Key features include a RISC instruction set with 33 single-word instructions, a two-level deep hardware stack, direct/indirect/relative addressing modes, a single 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler, and seven or eight special-function hardware registers. The -RCI temperature grade typically denotes an industrial operating range of -40C to +85C, with the 'C' suffix identifying the CMOS-process revision. The PIC16C54-RCI/SS is OTP, meaning the program memory can be written only once - a contract between cost and flexibility versus flash-based F-series parts. The 'SS' suffix designates the 20-pin SSOP (Shrink Small Outline Package) footprint, which provides a denser alternative to the 18-pin PDIP for space-constrained assemblies while remaining hand-solderable with standard techniques. Typical applications include appliance control, low-end remote controllers, LED lighting sequencers, battery chargers, security-system keypads, and simple sensor/actuator nodes. The minimal instruction set and two-level stack favour shallow call-depth firmware rather than complex state machines. When designing with this device, note that PIC16C5x parts use a 12-bit program counter and two-level hardware stack, so deeply nested subroutines are not possible. For new designs, Microchip recommends the flash-based PIC16F54 as the modern replacement, which preserves the pinout while adding reprogrammability.

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PIC16C54-XT/P

PIC16C54-XT/P - 4MHz 8-Bit OTP MCU, 768B | Microchip

The Microchip Technology PIC16C54-XT/P is an EPROM/ROM-based 8-bit CMOS microcontroller operating at 4 MHz with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, housed in an 18-pin PDIP (P) through-hole package. It belongs to the PIC16C5x baseline family and features 25 bytes of general-purpose RAM, 12 digital I/O pins, an 8-bit real-time clock/counter (TMR0), a two-level deep hardware stack, and direct, indirect, and relative addressing modes for data and instructions. What is a baseline PIC microcontroller? A baseline PIC (Peripheral Interface Controller) microcontroller is an 8-bit Harvard-architecture RISC device in which program and data memory sit on separate buses. The 12-bit-wide instruction word yields 2:1 code compression over many competing 8-bit CISC microcontrollers of the same class, and the small instruction set keeps the silicon die and quiescent current extremely low. OTP variants are programmed once at production time and cannot be erased, which makes them ideal for high-volume, cost-sensitive embedded products where firmware is fully frozen before launch. Key features of the PIC16C54-XT/P include its 4 MHz maximum clock frequency, the XT oscillator mode that supports a standard external crystal or resonator, a wide 2.5 V to 6.25 V (or per-datasheet 2.0 V to 6.25 V) operating voltage range, low-power CMOS construction, and seven/eight special-function hardware registers for compact firmware control. The 12 I/O pins are bidirectional with individually programmable direction. The PIC16C54-XT/P uses a pipelined RISC core: every instruction executes in a single instruction cycle except for program branches, which take two cycles. The OTP program memory is accessed on a 12-bit bus, while RAM and SFRs use an 8-bit data bus. This Harvard split lets the core fetch the next opcode while completing the current instruction, giving the device its characteristic throughput-per-MHz advantage over accumulator-based 8-bit microcontrollers. Typical applications for the PIC16C54-XT/P include low-cost consumer appliances, electronic toys, simple timer/sequencer circuits, automotive body controllers, smart-card readers, IR remote-control transmitters, and replacement logic for discrete glue-logic circuits. The wide operating voltage and small footprint also make it a fit for battery-powered devices and industrial sensor interfaces. When designing with the PIC16C54-XT/P, remember that the OTP memory cannot be re-programmed in-circuit, so choose the UV-erasable PIC16C54C-04/P or flash PIC16F54-I/P for prototype iteration. Always place the bypass capacitor (typically 0.1 microfarad) as close as possible to VDD and VSS pins, and respect the oscillator start-up time when using the XT crystal mode. This page consolidates distributor pricing, verified drop-in alternatives from the PIC16C5x family, and practical design notes that complement the Microchip datasheet.

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PIC16C54-XT/SO

PIC16C54-XT/SO - 4MHz 8-Bit OTP MCU 768B | Microchip

The Microchip Technology PIC16C54-XT/SO is an 8-bit CMOS OTP microcontroller from the foundational PIC16C5x family, running at 4 MHz and packaged in an 18-pin SOIC (0.295 inch / 7.50 mm width). It integrates 768 bytes of OTP program memory (512 x 12-bit words), 25 bytes of general-purpose RAM, and 12 digital I/O pins, providing a compact RISC compute core for simple control applications. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, RAM, program memory, and I/O peripherals. It sits within the broader hierarchy of microcontrollers -> embedded processors -> semiconductors, and the PIC16C5x specifically uses a 12-bit wide instruction word that delivers 2:1 code compression over competing 8-bit MCUs in the same price category, meaning more functional code fits into the same program-memory footprint. Key features include 12-bit-wide instructions with an 8-bit data path, seven special-function hardware registers, a two-level deep hardware stack, and direct, indirect, and relative addressing modes for both data and instructions. The device also integrates an 8-bit real-time clock/counter (TMR0) with a programmable prescaler, a watchdog timer for unattended operation, and brown-out / power-on reset protection. The XT suffix designates a 4 MHz crystal/ceramic-resonator oscillator option, while the /SO suffix denotes the 18-pin SOIC surface-mount package. Architecturally, the PIC16C54-XT/SO employs a Harvard RISC core with a single-cycle instruction set (except for program branches, which take two cycles), enabling deterministic instruction timing for real-time control. The OTP program memory allows one-time field programming - ideal for mature production designs that no longer need firmware updates - while its CMOS process delivers low power consumption across the commercial operating range. Typical applications include appliance controllers, simple sensor interfaces, LED driving circuits, keyboard scanners, low-end consumer electronics, and replacement of discrete logic in glue-logic consolidation designs. The wide operating voltage range also supports 5V regulated industrial systems. When designing with this part, note that the OTP memory cannot be reprogrammed, so firmware must be fully validated before burning. An OTP-to-Flash migration path to PIC16F54 is recommended for new designs requiring in-field firmware updates. This page synthesizes current distributor stock and pricing, pin-compatible drop-in alternatives within the PIC16C5x family, and practical design notes not aggregated in the manufacturer datasheet, helping engineers make faster sourcing and design decisions.

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PIC16C54-XT/SS

PIC16C54-XT/SS - 8-Bit CMOS MCU, 4MHz, 512B EPROM | Microchip

The Microchip Technology PIC16C54-XT/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, operating at 4 MHz with 12-bit wide instructions and an 8-bit data path in a 20-pin SSOP package. The part features 512 x 12 (768 bytes) of program memory, 25 bytes of RAM, and a 12-bit instruction word that delivers roughly 2:1 code compression over competing 8-bit MCUs. The XT suffix denotes a 4 MHz crystal/resonator oscillator option, and the SS suffix denotes the 20-pin SSOP surface-mount package shipped in tube. What is an 8-bit microcontroller? An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data path that integrates a CPU, program memory, working RAM, and peripheral I/O. The PIC16C5X family belongs to Microchip's foundational PIC architecture, which sits in the broader taxonomy: microcontroller -> embedded processor -> integrated circuit -> semiconductor. These devices target cost-sensitive, deterministic control tasks such as appliance control, remote sensor nodes, and replacement of discrete logic gates. Key features include 33 single-word single-cycle instructions, a two-level hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time counter (TMR0), and a watchdog timer. The PIC16C5X uses a RISC-style Harvard architecture that executes most instructions in a single instruction cycle (200 ns at 20 MHz, 1 us at 4 MHz). Operating voltage ranges from 2.5 V to 6.25 V (typical 3.3 V / 5 V operation), suiting both battery and line-powered systems. The architecture uses a 12-bit program bus separate from the 8-bit data bus, enabling simultaneous instruction fetch and data access. Seven or eight special function hardware registers control I/O and peripheral operation. The part supports in-circuit serial programming (ICSP) through dedicated RB6/RB7 pins on compatible variants, and OTP one-time-programmable EPROM memory is windowed for erasure on JW-package versions. A newer Flash-based PIC16F54 is recommended by Microchip for new designs. Typical applications include consumer appliance control, RC servo drivers, simple sensor conditioning, LED chasers, low-cost toys, and replacement of 74-series glue logic. The deterministic instruction timing and small footprint also suit automotive accessory controllers and industrial timer modules. When designing with this part, ensure your assembly code respects the two-level hardware stack because deeper nesting requires software-managed shadow registers. Brown-out and in-system programming require specific oscillator configurations; verify with the Microchip PIC16C5X datasheet before locking in the BOM. This page synthesizes distributor stock signals, same-brand drop-in alternatives from the PIC16C5X/PIC16C55X/PIC16C57X families, and practical design notes not found in the manufacturer datasheet.

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PIC16C54-XTE/P

PIC16C54-XTE/P - 8-Bit 4MHz OTP MCU, 768B | Microchip

The Microchip PIC16C54-XTE/P is a member of the PIC16C5x family of 8-bit CMOS OTP (One-Time Programmable) microcontrollers operating at 4 MHz, with 768 bytes (512 x 12) of program memory and 25 bytes of RAM, housed in a 18-pin PDIP (Plastic DIP) package. It delivers 12 I/O pins, a single 8-bit timer/counter (TMR0), and a two-level hardware stack, providing a minimal-footprint RISC control core for high-volume cost-sensitive embedded designs. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O peripherals, and is the smallest unit of programmable intelligence in an embedded system. The PIC16C5x family uses a 12-bit instruction word and 8-bit data path with separate code and data spaces (Harvard architecture), achieving roughly 2:1 code compression over CISC 8-bit competitors. Positioned within the product hierarchy, the PIC16C54 sits at the entry point: 8-bit PIC > PIC16 family > PIC16C5x sub-family > baseline OTP MCU. Key features include 33 single-word instructions, a 1.024 µs instruction cycle at 4 MHz oscillator, two hardware stack levels, and direct/indirect/relative addressing modes for both data and instructions. The device operates from 2.5 V to 6.25 V across the commercial 0 °C to 70 °C range (PIC16C54-XTE/P is the commercial-temperature 4 MHz extended-temperature variant). Its seven or eight special-function hardware registers provide low-context-overhead interrupt-free control for simple glue-logic replacement. Architecturally, the PIC16C54 uses a RISC pipeline with single-cycle instruction fetch (except branches), eliminating the bus-turnaround penalty common to von-Neumann 8-bit parts of the era. The OTP program memory is one-time programmable, ideal for mature, stable code in production quantities. Watchdog timer and Power-on Reset are hardware-only, removing firmware initialization steps for brown-out-free applications. Typical applications include consumer appliances, simple sensor conditioning, automotive sub-systems (dash controls, lighting timers), industrial remote-control transmitters, low-cost toys, and battery-powered smart-card peripherals. In each case the PIC16C54-XTE/P replaces discrete logic with programmable state machines while keeping bill-of-materials cost at the bottom of the MCU range. When designing with the PIC16C54-XTE/P, treat the 18-pin PDIP footprint as the reference and verify the chosen alternative shares both pinout and the 4 MHz oscillator specification. Two-level hardware stack limits call depth to two nested subroutine levels — keep ISRs and routines flat, or migrate to a PIC16F-series successor for deeper stack and Flash reprogrammability. This page synthesizes distributor pricing, datasheet cross-reference data, drop-in same-package alternatives, and practical design notes not found on the manufacturer's product brief.

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PIC16C54-XTE/SO

PIC16C54-XTE/SO - 8-bit CMOS MCU, 768B OTP, SOIC-18 | Microchip

The Microchip PIC16C54-XTE/SO is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, offering 768 bytes of OTP program memory, 25 bytes of RAM, and 12 I/O pins in an 18-pin SOIC wide-body package. It operates from 3.0V to 5.5V and is specified for the commercial and extended temperature range (-40C to +125C), combining a 20 MHz external oscillator interface with Microchip's RISC instruction set. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O on one die. Within the broader semiconductor taxonomy it sits under microprocessor IC -> microcontroller -> 8-bit microcontroller -> CMOS RISC MCU. The PIC16C5X family specifically targets cost-sensitive embedded control applications where deterministic instruction execution, low power, and a small code footprint matter more than absolute computational throughput. Its 12-bit-wide instruction word yields roughly 2:1 code compression over typical 8-bit CISC competitors in the same price tier. Key features of the PIC16C54-XTE/SO include a RISC architecture with 33 single-word/single-cycle instructions, hardware watchdog timer with on-chip RC oscillator, power-on reset, brown-out reset, and a four-source interrupt controller. The 8-bit timer/counter with programmable prescaler supports event counting and timing applications, while the high-current sink/source capability on RA0-RA3 allows direct LED driving in some configurations without external buffers. The device uses a Harvard-class internal bus with separate program and data paths and a 2-stage pipeline, allowing most instructions to execute in one oscillator period. With a 20 MHz crystal the instruction cycle is 200 ns, providing up to 5 MIPS of throughput. Power consumption is approximately 2 mA at 5V/20 MHz and drops to under 1 uA in Sleep mode, making the part viable for battery-powered products. Typical applications include appliance control, automotive subsystems (body controllers, instrument cluster drivers), security and access control peripherals, low-end remote controls, and industrial timer/counter modules. The wide-body SOIC-18 package simplifies hand-prototyping and rework on through-hole-friendly pad patterns, while the extended-temperature grade supports outdoor and under-hood deployments. When migrating designs, note that the PIC16C54 is NRND (Not Recommended for new designs); new designs should target PIC16F54 (flash) or PIC16F57 (enhanced flash) for the same SOIC-18 footprint and toolchain compatibility. Brown-out reset voltage thresholds must be selected per the system supply tolerance; refer to the configuration word table before committing a layout. This page synthesizes distributor pricing tiers, verified drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet.

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PIC16C54-XTE/SS

PIC16C54-XTE/SS - 8-bit OTP MCU, 768B, 20-SSOP | Microchip

The Microchip Technology PIC16C54-XTE/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, packaged in a 20-pin SSOP (5.30 mm body, 0.65 mm pitch) and offered in the extended (E) temperature grade. It integrates 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, 25 bytes of general-purpose RAM, and a 12-bit instruction word architecture with only 33 single-word/single-cycle instructions (200 ns at 20 MHz). The 'XT' speed grade designates a 4 MHz maximum oscillator frequency, suitable for low-cost resonator or crystal timing references, and 'XTE' further specifies the extended temperature option. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripherals into one package. The PIC16C5X family belongs to the broader taxonomy of 8-bit microcontrollers -> microcontrollers -> embedded processors -> semiconductors. Within Microchip's portfolio, the PIC16C5X represents the entry-level, lowest-cost OTP tier aimed at high-volume, cost-sensitive applications where firmware is finalized and one-time programming is acceptable. Key features include 12 I/O pins (raffle across PORTA and PORTB), a Watchdog Timer (WDT) with on-chip RC oscillator for code-protect recovery, Power-on Reset (POR), and a programmable code-protect bit. The 8-bit timer/counter (TMR0) with an 8-bit prescaler is shared between the WDT and general timing functions, and an external interrupt (INT) on RB0/INT provides edge-triggered wake-up capability. The device operates from 3.0 V to 6.0 V across the -40 C to +125 C industrial/extended range. The PIC16C5X architecture uses a RISC-like Harvard structure with separate program and data buses, eliminating instruction-fetch bottlenecks and enabling deterministic single-cycle execution for all but program branches (which take two cycles). The 12-bit-wide instruction word yields an average 2:1 code compression over typical 8-bit MCU architectures in the same class, reducing program-memory footprint and cost per unit. Typical applications include industrial control logic, appliance control boards, automotive body electronics (non-safety), smart sensors, low-end consumer products, and battery-powered devices where the 4 MHz speed and 3-6 V supply fit the design envelope. The 20-pin SSOP footprint also suits compact handheld and portable designs where board area is at a premium. The Microchip-suggested successor is the PIC16F54, a flash-based variant that retains the same peripheral set and pinout family, enabling drop-in firmware migration for new designs. When designing with this part, note that the OTP memory cannot be reprogrammed in-circuit. For prototyping or firmware iteration, use a windowed CERDIP package (PIC16C54/JW) for UV erasure, or migrate to the flash-based PIC16F54 family for development flexibility. Always include proper decoupling (100 nF + 10 uF) near VDD and use a current-limited in-circuit serial programming (ICSP) header for production programming. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond the manufacturer datasheet to help engineers evaluate the PIC16C54-XTE/SS for both new designs and legacy board reworks.

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PIC16C54-XTI/P

PIC16C54-XTI/P - 4MHz 8-Bit OTP MCU, 12 I/O | Microchip

The Microchip Technology PIC16C54-XTI/P is a 4 MHz 8-bit CMOS microcontroller in the PIC16C5x family, supplied in an 18-pin PDIP through-hole package. It integrates 768 bytes of One-Time-Programmable (OTP) program memory organized as 512 × 12, 25 bytes of data RAM, and 12 digital I/O pins suitable for direct LED and switch interfacing. Operating from 3.0V to 6.25V (3.3V/5V typical), the part delivers deterministic RISC-style execution with 33 single-word instructions and a two-level hardware stack. A microcontroller (MCU) is a single-chip computer that contains a CPU, memory, and programmable I/O peripherals. In the system hierarchy, MCUs sit below microprocessors (MPUs) and above discrete logic, with the PIC16C5x family being one of the earliest commercial RISC MCU architectures, designed for cost-sensitive embedded control. The PIC16C5x architecture uses a Harvard-style separate program/data bus with a 12-bit wide instruction word, allowing most instructions to execute in a single instruction cycle (4 clock periods). Key features include 4 MHz maximum clock frequency, 12 I/O pins arranged across PORT A (5) and PORT B (8), an 8-bit timer/counter (TMR0) with 8-bit prescaler, power-on reset, watchdog timer, and an operating temperature range of -40C to +85C. The XT oscillator suffix denotes a standard crystal/ceramic resonator clock input (typically up to 4 MHz), making it suitable for precise timing applications. Architecturally, the PIC16C54 uses a 12-bit instruction set with a fixed 2-level hardware stack, meaning nested subroutines beyond depth 2 are not supported. Program memory is OTP (one-time programmable), so code is permanently written at production or development programming. The 25-byte RAM limits data-intensive processing, restricting the device to small state machines and control loops. Typical applications include appliance control (microwave ovens, washing machines), industrial timers, simple sensor interfaces, automotive interior accessories, and low-cost consumer electronics where the small footprint and proven PIC ecosystem offset the absence of flash memory. The PDIP-18 package is favored for breadboarding and educational use. When designing with this device, consider migrating to flash-based equivalents (PIC16F54, PIC16F84A) for prototyping where repeated reprogramming is required. The OTP nature of the PIC16C54 makes it best suited for volume production where code is finalized. Ensure adequate decoupling (0.1 uF on VDD) and use a crystal that matches the XT oscillator loading capacitance specification. This page synthesizes verified distributor pricing, drop-in compatible alternatives from the PIC16C5x family, and practical design notes sourced from Microchip documentation - content not aggregated on DigiKey or Mouser product listings.

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PIC16C54-XTI/SO

PIC16C54-XTI/SO - 8-Bit OTP MCU 4MHz 768B | Microchip | 18-SOIC

The Microchip PIC16C54-XTI/SO is an 8-bit CMOS OTP (One-Time-Programmable) microcontroller from the PIC16C5X family operating at up to 4 MHz, with 768 bytes (512 x 12) of program memory, 25 bytes of RAM, and 12 I/O pins, housed in an 18-pin SOIC package rated for the industrial temperature range (-40C to +85C). A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory, volatile data RAM, and configurable peripheral I/O, all integrated into one IC. The PIC16C5X belongs to the PIC16 family of microcontrollers, which sits inside the broader 8-bit MCU taxonomy alongside 8051, AVR, and ST7 architectures, and serves as a foundational tier of the embedded semiconductor hierarchy (8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC). The "C" suffix denotes the CMOS EPROM-based process; the "54" designates the family member with 768 bytes of OTP program memory. Key features include 33 single-word single-cycle RISC instructions, a two-level hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, a watchdog timer, power-on reset, and seven or eight special function hardware registers. All instructions execute in a single 250 ns instruction cycle at 4 MHz (XT oscillator), achieving approximately 4 MIPS throughput with deterministic core execution. The device employs a Harvard architecture with a 12-bit-wide instruction word and an 8-bit-wide data path, producing a typical 2:1 code compression advantage over competing 8-bit MCUs in the same price class. The internal oscillator start-up timer and power-up timer eliminate external reset circuitry in many designs, while the wide operating voltage range supports both 3V and 5V systems. The SOIC-18 surface-mount package allows low-profile industrial assembly. Typical applications include appliance control, LED display drivers, remote transmitters, simple sensor interfaces, battery chargers, and low-cost consumer electronics where deterministic execution and minimal external component count matter more than memory size or peripheral richness. The industrial temperature grade (-40C to +85C) extends usability to factory automation peripherals and outdoor instrumentation. When designing with this device, ensure that the XT oscillator crystal or resonator value is matched to the application's clock accuracy requirement (4 MHz max for the "XT" designation), and add proper power-supply decoupling (0.1 uF ceramic) close to VDD. Note that OTP memory cannot be re-programmed - choose the PIC16F54 Flash variant if in-field firmware updates are required. This page synthesizes distributor pricing, drop-in PIC16C5X family alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C54-XTI/SS

PIC16C54-XTI/SS - 8-bit OTP MCU, 0.75KB, 12 I/O, SSOP-20 | Microchip

The Microchip Technology PIC16C54-XTI/SS is a 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, packaged in a 20-pin SSOP (SS) with industrial temperature rating. The -XTI suffix denotes an extended (4 MHz) speed grade, industrial temperature range (-40C to +85C), and the /SS package code designates the SSOP-20 surface-mount form factor. It integrates 0.75 KB of program memory, 25 bytes of RAM, and 12 digital I/O pins. An 8-bit microcontroller (MCU) is a small computer-on-a-chip containing a CPU, memory, and peripherals, designed for embedded control tasks. Within the semiconductor taxonomy, the PIC16C54 belongs to the hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. RISC-based MCUs like the PIC16C5X use a small, fixed-length instruction set to deliver predictable, deterministic execution — well-suited to real-time control loops where instruction-cycle timing must be known exactly. Key features include a RISC architecture with 33 single-word/single-cycle instructions, 12-bit-wide instruction words with 8-bit-wide data path, two-level deep hardware stack, and direct/indirect/relative addressing modes. The device integrates an 8-bit real-time clock/counter (TMR0), a watchdog timer (WDT) for runaway-code recovery, and power-on reset (POR) circuitry. Its fully static CMOS design allows the clock to be stopped without losing register state, enabling low-power standby strategies in battery-powered applications. The PIC16C5X family is fabricated on an OTP (one-time-programmable) EPROM process, which differentiates it from flash-based PIC16F successors. The 'C' in PIC16C54 indicates the EPROM-based windowed/OTP variant. The -XT speed grade corresponds to a 4 MHz maximum oscillator frequency. Because OTP memory cannot be erased electrically, this part is typically used in mature, high-volume products where code revision is finalized. Typical applications include appliance control, automotive body modules, industrial sensor interfaces, low-end remote controls, and small consumer devices requiring deterministic loop execution. Its 12 I/O pins, hardware stack, and single-cycle instruction set make it appropriate for simple state-machine and timing-critical control tasks. Pairing the MCU with the PICkit 1 or MPLAB PM3 programmer enables development and pre-production programming. When designing with this part, allocate sufficient decoupling (100 nF ceramic) close to VDD, and ensure the MCLR pull-up is correctly biased. Because the SSOP-20 has limited thermal mass, confirm that industrial-temperature operation (-40C to +85C) is observed when the device is used in enclosed enclosures. For new designs, consider PIC16F54 flash-based drop-in alternatives that allow in-circuit re-programming. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical SSOP-20 design notes that go beyond the bare manufacturer datasheet, helping engineers evaluate the PIC16C54-XTI/SS for both legacy maintenance and new design reuse.

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PIC16C54/JW

PIC16C54/JW - 4MHz 8-Bit OTP EPROM MCU | Microchip | 18-CERDIP

The Microchip Technology PIC16C54/JW is a 4MHz 8-bit EPROM-based RISC microcontroller in an 18-pin CERDIP (windowed) package. It integrates 768 bytes (512 x 12) of one-time-programmable (OTP) EPROM program memory, 25 bytes of RAM, and 12 digital I/O pins, all built around Microchip's PIC16C5X family architecture. The PIC16C54 belongs to the classic PIC16C5X family of low-cost, high-performance 8-bit fully-static EPROM/ROM-based CMOS microcontrollers. It uses a RISC architecture with only 33 single-word/single-cycle instructions, providing a 2:1 code compression advantage over competing 8-bit MCUs in its class. A PIC16C5X device is a member of the broader PIC (Peripheral Interface Controller) family, which is a type of microcontroller (MCU) — a small computer-on-a-chip containing CPU, memory, and I/O peripherals on a single integrated circuit. Within that hierarchy, the PIC16C54 is a 'low-end' baseline MCU aimed at simple embedded control tasks. Key features of the PIC16C54/JW include a 12-bit instruction word with an 8-bit data path, two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time counter (TMR0), and a 4MHz maximum clock frequency. It supports 4.5V to 5.5V supply operation, a watchdog timer, power-on reset, and 12 CMOS-compatible bidirectional I/O lines. The 'JW' suffix denotes the ceramic CERDIP package with an ultraviolet-erasable window, which allows engineers to erase and re-program the device multiple times during prototyping. From an architectural standpoint, the PIC16C54/JW is built on Microchip's baseline PIC core, which executes one instruction per clock cycle (no pipeline stalls on instruction fetches thanks to Harvard architecture separation of program and data memories). The 12-bit instruction width reflects the baseline PIC's emphasis on compact code rather than register-rich operation. The two-level hardware stack is intentionally shallow, which constrains subroutine nesting depth but keeps the device deterministic for interrupt-free control loops. Typical applications for the PIC16C54/JW include industrial control logic, simple sensor interfaces, consumer appliance controllers, automotive subsystems (pre-CAN), and legacy embedded systems. It is particularly suited to low-cost, low-power applications where a small instruction set, small memory footprint, and proven long-term availability are valued. The windowed CERDIP package is used during development and field upgrades; for production, the OTP plastic variants (PIC16C54-04/P, PIC16C54-10/P) are preferred. When designing with the PIC16C54/JW, engineers must note that the 4MHz maximum clock rate limits it to roughly 1 MIPS of throughput, and the 2-level hardware stack restricts nested subroutines to two levels. Erasure of the windowed CERDIP package requires a UV EPROM eraser (approximately 20 minutes of high-intensity UV exposure) before re-programming. For new designs, Microchip recommends the modern PIC16F54 flash-memory successor as a pin-compatible migration path. This page synthesizes distributor availability, same-family drop-in alternatives, and practical UV-EPROM design notes not found on a single manufacturer page.

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PIC16C54A-04/P

PIC16C54A-04/P - 8-bit OTP MCU, 4MHz, 768B | Microchip

The Microchip Technology PIC16C54A-04/P is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 4 MIPS performance at 4 MHz clock speed in an 18-pin PDIP through-hole package. It integrates 768 bytes (512 x 12) of one-time-programmable (OTP) program memory, 25 bytes of RAM, and 12 digital I/O pins, all on a RISC core with 33 single-word single-cycle instructions. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripherals on one die. The PIC16C5X family belongs to the broader 8-bit MCU class within the microcontroller hierarchy: microcontroller -> 8-bit MCU -> RISC MCU -> EPROM/ROM-based MCU -> OTP MCU. These devices serve as low-cost embedded controllers in cost-sensitive applications that do not require reprogrammability, occupying the entry-level tier alongside the contemporary PIC16F series and competing with 8051 derivatives. Key features of the PIC16C54A-04/P include a 4 MHz maximum operating frequency (the "-04" speed grade), 12-bit wide instructions for 2:1 code compression over competing 8-bit architectures, an 8-bit real-time clock/counter (TMR0), and a two-level deep hardware stack. Power consumption is optimized at 4.5V to 5.5V supply, and the device includes an internal power-on reset, watchdog timer (on selected die revisions), and a sleep mode for low-power standby. The 12 I/O pins can each drive source/sink currents suitable for LED and small-signal relay control. Architecturally, the PIC16C54A employs a Harvard RISC design with separate program and data buses, enabling single-cycle instruction execution except for program branches (which take two cycles). The OTP EPROM cell is one-time-programmable, meaning the part is intended for low-to-medium volume production after code is finalized. The four-digit suffix "-04" indicates the 4 MHz speed grade; the -10 variant runs at 10 MHz for higher-throughput designs. Typical applications include consumer appliance controls, simple sensor interfaces, LED display drivers, low-end remote controls, and replacement of discrete logic in cost-driven embedded products. The through-hole PDIP-18 package suits prototyping, hobbyist projects, and legacy designs where socketed parts are preferred. Per the Microchip product page, a newer device, the PIC16F54, is recommended for new designs. When designing with the PIC16C54A-04/P, ensure the oscillator configuration (RC, XT, LP, or HS) matches the application: this part is specified for 4 MHz, requiring an XT-mode crystal. The OTP memory means firmware must be fully verified before programming; for iterative development, consider the PIC16F54 equivalent or the PIC16C54C revision. This page synthesizes distributor pricing, drop-in OTP alternatives in the same PDIP-18 footprint, and practical design notes not found in the manufacturer datasheet.

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PIC16C54A-04/SO

PIC16C54A-04/SO - 8-Bit 4MHz OTP MCU, 18-SOIC | Microchip

The Microchip Technology PIC16C54A-04/SO is an 8-bit RISC microcontroller from the PIC16C5x family, delivering 4 MHz CPU performance with 768 bytes of One-Time-Programmable (OTP) program memory and 25 bytes of data RAM, housed in an 18-pin SOIC package. The 'A' revision provides instruction-set improvements over the original PIC16C54 and is built on a fully static CMOS process, enabling operation down to DC and a wide 4.5V to 5.5V supply range. An OTP microcontroller is a member of the broader microcontroller family, which itself belongs to the embedded processing class of semiconductors. Within the PIC16C5x hierarchy, the PIC16C54A sits at the low-pin-count, low-memory tier (768B code, 25B RAM, 12 I/O pins) and is positioned below the PIC16C55/56/57/58 variants. The part is designed for cost-sensitive, high-volume embedded control where ROM/EPROM/Flash flexibility is unnecessary and one-time factory or in-circuit programming at production time is acceptable. Key features include a 12-bit instruction word with 33 single-word instructions, a two-level deep stack for subroutine nesting, seven or eight special-function hardware registers, an 8-bit real-time counter/timer (TMR0) with 8-bit prescaler, direct/indirect/relative addressing modes, and 12 bidirectional digital I/O pins grouped into two ports (PORTB, PORTA-style). Power-saving SLEEP mode and a Watchdog Timer (WDT) are provided for unattended and brown-out-tolerant applications, though the commercial-temperature PIC16C54A does not include the Low-Voltage Programming (LVP) feature found on later F-series parts. The PIC16C5x architecture uses a 12-bit-wide instruction set with an 8-bit-wide data path, yielding approximately 2:1 code compression versus other 8-bit microcontrollers in its class and giving the PIC16C54A a meaningful performance/cost advantage in timing-sensitive control loops. Two addressing modes for data plus a two-level hardware stack make assembly code portable across the 16C5x/16F5x family, simplifying migration to PIC16F54 when flash-based reprogramming is desired. Typical applications include simple appliance controllers, remote-control transmitters, LED driving and lighting controllers, battery chargers, sensor signal conditioning, smart toys and consumer gadgets, automotive body and interior modules, and any cost-driven 5V embedded node. The 18-pin SOIC footprint keeps the BOM small and the PCB layout straightforward for hand-solderable prototypes as well as high-volume reflow assembly. When designing with the PIC16C54A-04/SO, choose a 4 MHz crystal or external clock with two 22 pF loading capacitors and ensure the MCLR reset network (typically 10 kohm pull-up plus 100 nF cap) is present. Because the memory is OTP, firmware bugs cannot be field-updated, so a verified production flow (or migration to PIC16F54 for development convenience) is recommended. This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C54A-04/SS

PIC16C54A-04/SS - 8-Bit 4MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16C54A-04/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5x family operating at up to 4MHz, 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 delivers 12 I/O pins, a two-level deep hardware stack, and a single 8-bit Timer0 with a programmable prescaler, providing a compact, low-cost RISC control platform for simple embedded designs. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, I/O peripherals, and timers on one die. The PIC16C54A belongs to the original PIC16C5x baseline family introduced by Microchip in the early 1990s; these were the industry's first 8-bit RISC microcontrollers with 12-bit-wide instructions and an 8-bit-wide data path, achieving 2:1 code compression over competing 8-bit architectures in the same price tier. This category sits within the broader hierarchy: 8-bit microcontroller -> RISC microcontroller -> embedded controller -> integrated circuit. Key features of the PIC16C54A-04/SS include 33 single-word, single-cycle instructions, direct/indirect/relative addressing modes, a power-on reset, a watchdog timer with on-chip RC oscillator, and a wide operating voltage range from 2.5V to 6.0V. The '04' speed grade specifies a 4MHz maximum clock, and the OTP EPROM program memory is ideal for low- to medium-volume production where mask-ROM tooling is uneconomical. CMOS technology delivers low power consumption (typically < 2 mA at 5V/4MHz), making this part suitable for battery-aware applications. Architecturally, the device uses a Harvard-style separate code and data bus, a 12-bit instruction word, and a small register file of seven or eight special-function hardware registers. This minimal footprint is intentional: the design optimises die area, cost, and predictability for high-volume appliance and consumer-electronics tasks rather than peripheral-rich applications. There is no ADC, no UART, no interrupts, and no on-chip oscillator, keeping the silicon die small and the unit price low. Typical applications include remote controls, small appliance controls, LED driving patterns, simple sensor interfaces, battery chargers, security keypads, and any cost-sensitive volume-production design that previously used discrete logic. The SSOP-20 footprint is well supported on standard pick-and-place lines and accepts hand-soldering for prototyping. When designing with this part, note that Microchip's product page explicitly states: a newer device is available, please consider PIC16F54. The PIC16F54 is the recommended flash-memory successor for new designs. The PIC16C54A-04/SS remains in production for existing designs and maintenance spares but should not be selected for new projects. This page synthesises distributor pricing, cross-reference alternatives, and design notes not found in the manufacturer datasheet alone. Engineers comparing OTP vs flash 8-bit MCUs will find the comparison table and alternatives array particularly useful.

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PIC16C54A-04E/P

PIC16C54A-04E/P - 8-bit OTP MCU, 4MHz, 12 I/O, PDIP-18 | Microchip

The Microchip Technology PIC16C54A-04E/P is an 8-bit RISC EPROM/ROM-based CMOS microcontroller in a 18-pin PDIP through-hole package, belonging to the PIC16C5X family. It features a 12-bit instruction word, 33 single-word instructions (all single-cycle except program branches which are two-cycle), a 4 MHz maximum clock input (200 ns instruction cycle), 768 bytes of OTP program memory, 25 bytes of RAM, and 12 digital I/O lines. The device operates from a 4.5V to 5.5V supply and is rated for the extended commercial temperature range. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and peripherals around an 8-bit data bus. The PIC16C5X family sits at the low end of the microcontroller hierarchy: 8-bit MCU -> RISC microcontroller -> embedded controller -> semiconductor. It targets cost-sensitive, deterministic control tasks where instruction simplicity and predictable timing outweigh raw throughput. The RISC architecture's 33-instruction set reduces development time and code size versus CISC alternatives. Key features of the PIC16C54A-04E/P include OTP (One-Time Programmable) EPROM program memory, a 4 MHz external clock input, 25 bytes of general-purpose RAM, 12 bidirectional I/O pins with individual direction control, a power-on reset circuit, a watchdog timer with on-chip RC oscillator, and a sleep (low-power) mode. The 12-bit-wide instructions deliver 2:1 code compression over typical 8-bit CISC competitors, and the Harvard architecture separates program and data buses for deterministic instruction fetch. Typical applications include appliance controls, simple sensor interfaces, LED driving circuits, hobbyist projects, and industrial logic replacement. Designers favor the PIC16C54A-04E/P for low-cost, low-volume production where the OTP memory suffices and the extended temperature range supports commercial and light-industrial environments. Note that the underlying PIC16C54A die has been superseded by the PIC16F54; new designs are not recommended per the Microchip product page. When designing with this part, consider migrating to the flash-based PIC16F54 for new designs to gain in-system reprogrammability, or to the PIC16C54C revision for minor errata fixes. Programming requires a UV-erasable window for the JW package or a one-time-programmable programmer for the PDIP form. This page synthesizes distributor pricing, verified specifications from the Microchip datasheet family, and practical drop-in alternatives not consolidated on any single distributor page.

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PIC16C54A-04E/SS

PIC16C54A-04E/SS - 4MHz 768B OTP 8-Bit MCU | Microchip SSOP-20

The Microchip Technology PIC16C54A-04E/SS is a member of the PIC16C5X family of 8-bit, fully-static, EPROM/ROM-based CMOS microcontrollers. It operates at up to 4 MHz, integrates 768 bytes (512 × 12) of One-Time Programmable (OTP) program memory and 25 bytes of general-purpose RAM, and is packaged in a 20-pin SSOP (5.3 mm body width). The part is specified for the commercial 0 °C to +70 °C operating range (the "E" temperature designator) and a 4.5 V to 5.5 V supply. An OTP-based 8-bit microcontroller (also called a One-Time-Programmable MCU) is a single-chip computer that integrates CPU, non-volatile program memory, RAM, and peripherals on one die. Program memory is written once with a device programmer and cannot be erased, making these parts common in low-cost, fixed-function products. The PIC16C5X family falls under the taxonomy: microcontroller -> 8-bit MCU -> RISC MCU -> PIC16C family -> CMOS OTP microcontroller, and the PIC16C54A represents the 512 × 12 (≈768 byte) code-density tier of that family. Key features of the PIC16C54A-04E/SS include: 12 I/O pins with individual direction registers; a 33-instruction RISC instruction set with 12-bit-wide opcodes yielding 2:1 code compression over typical 8-bit CISC MCUs; Power-On Reset (POR), Watchdog Timer (WDT) and a selectable oscillator type (RC, XT, LP, HS); and 8-bit timer/counter. The -04 speed grade indicates a 4 MHz maximum oscillator frequency, and the SS package denotes a 20-pin SSOP. The PIC16C5X architecture uses a Harvard structure with separate program and data paths, 2-stage pipeline execution, and a fully-static core that allows the clock to be stopped without losing register state. The 12-bit instruction word matches the 12-bit program-memory organization, and the device address space is paged into two halves for code fetches above 0x1FF. Because it is CMOS and uses EPROM rather than flash for program storage, quiescent current is low in standby (≈ 1 µA typical for the family, depending on oscillator mode) and the part is well-suited to mains- or battery-powered appliances. Typical applications for the PIC16C54A-04E/SS include simple remote controls, small appliance controllers (toasters, coffee makers, fans), toys and educational hardware, sensor interface modules, and any high-volume, fixed-function logic replacement where 12-bit-wide RISC code density and an OTP part minimize unit cost. Designers also pick this family when they need a tiny, low-pin-count MCU that runs deterministically from a basic RC or crystal oscillator. When designing with this device, plan toolchain support carefully. PIC16C54A OTP parts are programmed with a Microchip device programmer (e.g., MPLAB PM3) and developed with MPLAB IDE / XC8 legacy compiler support; some modern MPLAB X features target the flash-based PIC16F equivalents instead. Always derate oscillator frequency for the chosen oscillator mode (RC, XT, LP, HS) and validate WDT behavior with MPLAB SIM before committing code to OTP parts. This page synthesizes distributor availability, drop-in package-compatible alternatives from the PIC16C5X family, and practical design notes that go beyond the manufacturer datasheet's brief device summary.

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PIC16C54A-04I/SO

PIC16C54A-04I/SO - 8-bit 4MHz 768B OTP MCU SOIC-18 | Microchip

The Microchip Technology PIC16C54A-04I/SO is an 8-bit RISC microcontroller in the PIC16C5X family, featuring a 4 MHz CPU clock, 768 bytes of One-Time-Programmable (OTP) program memory organized as 512 × 12 words, and 25 bytes of on-chip data RAM, housed in an 18-pin SOIC package (7.50 mm / 0.295 inch body width). Background: An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/Flash/OTP), data RAM, and peripheral I/O on one die. PIC microcontrollers use a RISC (Reduced Instruction Set Computer) architecture with a Harvard memory layout that separates program and data buses. The PIC16C5X series is one of Microchip's oldest and most cost-optimized families, designed for high-volume, cost-sensitive embedded control. OTP memory allows the user to program the device once with a low-cost EPROM writer, while the 12-bit wide instruction word gives 2:1 code compression compared with 8-bit CISC MCUs of the same era. Key features include 12-bit wide instructions, an 8-bit data path, seven special function hardware registers, a two-level deep hardware stack, and direct, indirect, and relative addressing modes for both data and instructions. The part also integrates an 8-bit real-time clock/counter (TMR0) and offers a 4 MHz maximum operating frequency, 12 digital I/O pins, and an instruction cycle time of four oscillator clocks. The device operates from a 4.5 V to 5.5 V single supply. Architecturally, the PIC16C54A implements a fully static CMOS core so the clock can be stopped without losing register state, and its symmetric instruction set is optimized for one-cycle execution except for branch instructions which take two cycles. The 12-bit instruction width delivers denser code than typical 8-bit MCUs of the same generation, allowing the small 512-word OTP program space to host meaningful applications. Typical applications include low-cost consumer appliances, hobbyist and educational projects, simple LED controllers, small white-goods control boards, and battery chargers where minimal logic and very low unit cost are required. The device is also used as a glue-logic replacement for discrete timer/sequencer circuits and as an introduction MCU for embedded training. When designing with the PIC16C54A-04I/SO, use the industrial temperature grade (I suffix) to ensure operation from -40 °C to +85 °C, and note that OTP memory cannot be reprogrammed in-circuit - a flash-based PIC16F54 should be considered for prototyping. Decoupling caps of 100 nF plus 10 µF close to VDD are required for stable operation. This page synthesizes Microchip distributor pricing, verified drop-in alternatives within the same PIC16C5X family, and practical design notes that are not consolidated in any single manufacturer document.

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PIC16C54A-04I/SS

PIC16C54A-04I/SS - 8-bit EPROM MCU, 4MHz, SSOP-20 | Microchip

The Microchip Technology PIC16C54A-04I/SS is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, delivering up to 4 MHz CPU clock speed in a 20-pin SSOP package. It integrates 768 bytes of one-time-programmable (OTP) program memory (512 x 12 words), 25 bytes of data RAM, and a 12-bit instruction word with 8-bit data path. The device operates from a 4.5V to 5.5V supply and is specified over the industrial -40C to +85C temperature range. An 8-bit PIC microcontroller (Programmable Intelligent Computer) is a Harvard-architecture RISC processor that executes single-cycle instructions from program memory while accessing a separate data memory space. Within the broader product taxonomy, the PIC16C5X belongs to the PIC16 family of mid-range microcontrollers, which itself sits within Microchip's 8-bit microcontroller portfolio under the Integrated Circuits > Microcontrollers category. EPROM-based PICs like the PIC16C54A were widely used in cost-sensitive, high-volume embedded applications where the program code is finalized at production time. Key features of the PIC16C54A-04I/SS include 12 I/O pins, an 8-bit real-time clock/counter (TMR0), a two-level hardware stack, and seven or eight special function hardware registers. Direct, indirect, and relative addressing modes are supported for both data and instructions. The 25-byte data RAM is shared with the seven special function registers, leaving a small working register file optimized for compact code. The 12-bit-wide instruction set achieves approximately 2:1 code compression versus competing 8-bit MCUs, an industry-recognized efficiency advantage of the PIC architecture. The PIC16C54A-04I/SS is built on a fully static CMOS process, allowing the CPU clock to be stopped without losing register state, which is valuable for ultra-low-power standby designs. The '04' speed suffix indicates a 4 MHz maximum oscillator frequency, while the 'A' suffix identifies the enhanced silicon revision over the original PIC16C54. The 'I' grade extends the operating temperature range to industrial -40C to +85C, and '/SS' denotes the SSOP-20 (Shrink Small Outline Package, 208 mil body width) surface-mount form factor. Typical applications include appliance controllers, simple sensor interfaces, battery chargers, LED drivers, automotive sub-systems (non-safety-critical), and other cost-sensitive embedded products that benefit from a tiny footprint and minimal external component count. With its small memory map and RISC core, the device targets applications where 768 bytes of OTP program storage is sufficient. When designing with this part, note that Microchip's product page recommends PIC16F54 as the recommended replacement for new designs. The PIC16F54 uses Flash program memory, allowing in-system reprogramming and erasing, which significantly improves development workflow and field-upgrade capability over the OTP PIC16C54A.

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PIC16C54-LPI/SS - 8-bit EPROM MCU, 12 I/O, SSOP-20 | Microchip

PIC16C54-RC/P - 8-Bit 4MHz OTP MCU, 12 I/O | Microchip

PIC16C54-RC/SO - 8-bit OTP MCU, 4MHz, 12 I/O | Microchip

PIC16C54-RC/SS - 8-bit OTP MCU, 4MHz RC Osc, SSOP-20 | Microchip

PIC16C54-RCE/SO - 8-bit OTP MCU, 4MHz, 768B ROM, SOIC-18 | Microchip

PIC16C54-RCE/SS - 8-Bit 4MHz OTP MCU 768B | Microchip

PIC16C54-RCI/SS - 8-bit 4MHz 768B OTP MCU 20-SSOP | Microchip

PIC16C54-XT/P - 4MHz 8-Bit OTP MCU, 768B | Microchip

PIC16C54-XT/SO - 4MHz 8-Bit OTP MCU 768B | Microchip

PIC16C54-XT/SS - 8-Bit CMOS MCU, 4MHz, 512B EPROM | Microchip

PIC16C54-XTE/P - 8-Bit 4MHz OTP MCU, 768B | Microchip

PIC16C54-XTE/SO - 8-bit CMOS MCU, 768B OTP, SOIC-18 | Microchip

PIC16C54-XTE/SS - 8-bit OTP MCU, 768B, 20-SSOP | Microchip

PIC16C54-XTI/P - 4MHz 8-Bit OTP MCU, 12 I/O | Microchip

PIC16C54-XTI/SO - 8-Bit OTP MCU 4MHz 768B | Microchip | 18-SOIC

PIC16C54-XTI/SS - 8-bit OTP MCU, 0.75KB, 12 I/O, SSOP-20 | Microchip

PIC16C54/JW - 4MHz 8-Bit OTP EPROM MCU | Microchip | 18-CERDIP

PIC16C54A-04/P - 8-bit OTP MCU, 4MHz, 768B | Microchip

PIC16C54A-04/SO - 8-Bit 4MHz OTP MCU, 18-SOIC | Microchip

PIC16C54A-04/SS - 8-Bit 4MHz OTP MCU, 768B | Microchip

PIC16C54A-04E/P - 8-bit OTP MCU, 4MHz, 12 I/O, PDIP-18 | Microchip

PIC16C54A-04E/SS - 4MHz 768B OTP 8-Bit MCU | Microchip SSOP-20

PIC16C54A-04I/SO - 8-bit 4MHz 768B OTP MCU SOIC-18 | Microchip

PIC16C54A-04I/SS - 8-bit EPROM MCU, 4MHz, SSOP-20 | Microchip