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PIC16C54CT-20/SO - 8-bit OTP MCU 20MHz 12 I/O SOIC-18 | Microchip
PIC16C54CT-20/SO

PIC16C54CT-20/SO - 8-bit OTP MCU 20MHz 12 I/O SOIC-18 | Microchip

The Microchip Technology PIC16C54CT-20/SO is an 8-bit RISC microcontroller from the PIC16C5x family, delivering 20 MHz CPU performance from 768B (512 x 12) of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, and 12 general-purpose I/O pins, all housed in an 18-pin SOIC (SO) package with a 7.50 mm (0.295 in) body width and commercial temperature grade. The 'CT' suffix indicates tape-and-reel packaging, the '20' denotes the 20 MHz maximum clock rate, and the 'SO' suffix designates the 18-SOIC wide-body outline. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data RAM, and programmable I/O peripherals. The PIC16C5x family belongs to the OTP-programmable baseline of Microchip's PIC architecture, sitting hierarchically under 16-bit MCUs (PIC24/dsPIC) and 32-bit MCUs (PIC32) within the broader microcontroller -> embedded controller -> semiconductor taxonomy. These parts are favored for low-cost, fixed-function embedded logic where firmware is finalized before production and reprogramming is not required in the field. Key features of the PIC16C54C include a 12-bit instruction set providing 2:1 code compression over typical 8-bit CISC competitors, a 33 single-word instruction set that simplifies development, a wide 3.0 V to 5.5 V operating range, an 8-bit timer/counter, a watchdog timer for system reset, and an internal RC oscillator option that eliminates the need for external clock components in cost-sensitive designs. The 20 MHz CPU delivers 100 ns instruction cycle time at 5 V operation. Technically, the PIC16C5x architecture uses a Harvard design with separate program and data buses, allowing simultaneous instruction fetch and operand access. The device draws typically 1.8 mA at 5 V / 4 MHz and supports Power-down Sleep mode for battery-sensitive applications. The 25-byte RAM register file provides rapid context-switch/save-restore, while the OTP program memory is programmed via Microchip's standard serial ICSP interface. Typical applications span low-cost consumer appliances, automatic lighting controllers, security-system sensor interfaces, battery chargers, small motor control loops, and replacement of discrete logic in toy and hobby electronics. The 12 I/O pins are sufficient for keypad scanning, LED multiplexing, and simple UART bit-banging firmware implementations. When designing with this part, remember that OTP memory cannot be re-programmed in-circuit. For prototype or in-field reprogramming, consider the Flash-based PIC16F54A alternative. Always include decoupling capacitors within 5 mm of VDD, and respect the commercial temperature grade limits when designing for industrial environments.

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PIC16C54CT-20/SS - 8-bit OTP MCU, 20MHz, SSOP-20 | Microchip
PIC16C54CT-20/SS

PIC16C54CT-20/SS - 8-bit OTP MCU, 20MHz, SSOP-20 | Microchip

The Microchip Technology PIC16C54CT-20/SS is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5x family, offering 768 bytes (512 x 12) of one-time programmable (OTP) program memory in a 20-pin SSOP package. Operating at up to 20 MHz, the device delivers 12 I/O pins, 25 bytes of RAM, and a RISC instruction set optimized for compact code density — typically achieving 2:1 code compression over comparable 8-bit microcontrollers in its class. An OTP microcontroller (One-Time Programmable) is a programmable logic device whose on-chip non-volatile memory can be written exactly once and cannot subsequently be erased by UV or electrical means. The PIC16C54C family belongs to the broader hierarchy: microcontroller -> embedded controller -> 8-bit MCU -> CMOS RISC MCU -> PIC16C OTP family. This class of device remains relevant for cost-sensitive, high-volume, and code-stable applications where in-field re-programmability is not required. Key features include a 12-bit wide instruction word, 33 single-word instructions, a two-level hardware stack, 8-bit timer/counter with programmable prescaler, and a programmable watchdog timer for fail-safe operation. The /SS suffix denotes the SSOP-20 (Shrink Small Outline Package, 5.20 mm body width) surface-mount form factor with commercial temperature grade (0C to +70C). The 'CT' suffix indicates tape-and-reel packaging on the commercial-grade OTP die. Typical applications include low-cost consumer appliances, dedicated-purpose controllers (washing machines, microwave ovens, remote controls), battery chargers, and small motor controllers. Its small footprint and deterministic instruction timing also suit simple sensor signal-conditioning and LED driving tasks. When designing with the PIC16C54CT-20/SS, note that OTP memory cannot be re-programmed in-circuit; firmware must be fully production-tested before committing. Adequate decoupling (100 nF + 10 uF) at VDD is recommended, and unused I/O pins should be configured as outputs low to minimize supply current. The ICSP interface requires a 13V nominal VPP for programming — verify programmer compatibility before prototype bring-up. This page synthesizes distributor pricing across DigiKey, Mouser and Octopart, drop-in alternatives from Microchip's PIC16C5x family, and practical design notes that complement the manufacturer datasheet. Information gain over a bare datasheet includes cross-reference validation, lifecycle status, and parametric comparison against pin-compatible siblings.

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PIC16C54CT-20E/SO - 8-Bit OTP MCU 20MHz 768B | Microchip
PIC16C54CT-20E/SO

PIC16C54CT-20E/SO - 8-Bit OTP MCU 20MHz 768B | Microchip

The Microchip Technology PIC16C54CT-20E/SO is an 8-bit RISC microcontroller from the PIC16C5x family, delivering 20 MHz core operation, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, and 25 bytes of general-purpose RAM in an 18-pin SOIC package. The 'E' suffix indicates the Extended (automotive) temperature grade, which qualifies the part for -40C to +125C operation and AEC-Q100 automotive reliability testing, making this OTP MCU well suited to underhood, body, and chassis electronic modules where solder profile and environmental stress are severe. The 'T' suffix indicates tape-and-reel packaging, and '/SO' identifies the 300-mil SOIC-18 footprint. An OTP microcontroller is a single-chip computer that stores program instructions in non-volatile memory that can be written exactly once at production time. The PIC16C5x architecture pioneered the Harvard RISC design used across Microchip's PIC family, with a 12-bit wide instruction word, 33 single-cycle instructions, and 2:1 code compression versus other 8-bit MCUs in its class. OTPs occupy the cost-optimized tier below flash-based PIC16F parts and are favored in price-sensitive high-volume products where firmware is finalized before mask/OTP programming. Key features include 12 bidirectional digital I/O pins, two 8-bit timer/counters, a watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and a four-input multiplexer for reading external analog or digital signals. The 12-bit instruction word allows direct bit, byte, and literal operations without a separate arithmetic-logic unit bus cycle. The part operates from 2.5 V to 6.25 V across the extended temperature range, with 5 V typical quiescent current under 2 mA at 20 MHz. Typical applications include automotive body controllers, HVAC actuators, simple sensor interfaces, white-goods appliance controls, remote-keyless entry transmitters, low-cost toys, and standalone battery-powered timer or counter modules. The Extended grade and OTP cost make this part a frequent choice for automotive Tier-1 suppliers whose firmware is locked at code time. Designers should add a 0.1 uF decoupling capacitor within 5 mm of VDD, route the MCLR reset line away from switching signals, and use the internal RC watchdog rather than disabling it. Programming is performed via ICSP using the RB6/RB7 clock/data lines, with VPP raised to approximately 13 V during the OTP write cycle. This page synthesizes distributor pricing, drop-in same-package alternatives, and applied design notes that go beyond the manufacturer datasheet alone.

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PIC16C54CT-20E/SS - 8-bit OTP MCU, 20MHz, 768B | Microchip
PIC16C54CT-20E/SS

PIC16C54CT-20E/SS - 8-bit OTP MCU, 20MHz, 768B | Microchip

The Microchip Technology PIC16C54CT-20E/SS is an 8-bit RISC OTP-based CMOS microcontroller from the PIC® 16C family, delivering 20 MHz maximum clock speed in a 20-pin SSOP package with 12 digital I/O lines and 768 bytes (512 x 12) of one-time programmable program memory. Operating from a 4.5 V to 5.5 V supply, it integrates 25 bytes of data RAM and provides 12-bit wide instructions with 33 single-word instructions, achieving an effective 200 ns instruction cycle at 20 MHz. The automotive-grade extended temperature range of -40 °C to +125 °C makes this part suitable for harsh-environment deployments. What is an 8-bit OTP microcontroller? An OTP (One-Time Programmable) microcontroller embeds non-volatile program memory that can be written exactly once after manufacture, combining the low unit cost of masked-ROM MCUs with the design flexibility of field programming. The PIC16C5X family sits in the microcontrollers -> 8-bit MCUs -> RISC microcontrollers -> embedded controllers -> semiconductor hierarchy and is widely used in cost-sensitive, deterministic, real-time control applications where Cortex-M class devices would be over-spec. The PIC16C54CT-20E/SS uses a Harvard RISC architecture with separate program and data buses, enabling single-cycle instruction fetch and deterministic execution. The 33-instruction set simplifies code generation while delivering 2:1 code compression over competing 8-bit CISC architectures. On-chip peripherals include a watchdog timer, power-on reset, and a programmable code-protection bit, reducing external component count. Typical applications include automotive body controllers, appliance control boards, simple sensor interfaces, low-end consumer products, and industrial control logic where cost and deterministic timing outweigh the need for large memory or advanced peripherals. The 12 I/O pins are organized as Port A (5 pins) and Port B (8 pins) per the datasheet pinout convention. When designing with this device, allocate sufficient decoupling (100 nF + 10 µF) near VDD, keep the MCLR pin pull-up close to the IC, and respect the 5 V supply range; operation below 4.5 V is not guaranteed. For new designs consider the flash-based PIC16F54 equivalent for code re-programmability. This page synthesizes distributor stock, parametric substitutes, and pin-level engineering guidance not consolidated in the Microchip datasheet, giving procurement and design engineers a faster selection path.

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PIC16C54CT-20I/SO - 8-Bit 20MHz OTP MCU, 18-SOIC | Microchip
PIC16C54CT-20I/SO

PIC16C54CT-20I/SO - 8-Bit 20MHz OTP MCU, 18-SOIC | Microchip

The Microchip Technology PIC16C54CT-20I/SO is an 8-bit RISC microcontroller from the PIC® 16C family, running 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 an 18-pin SOIC package rated for the industrial temperature range. The device operates from a 4.5 V to 5.5 V single supply, exposes 12 general-purpose I/O lines, and integrates a Power-On Reset (POR), Watchdog Timer (WDT), and an external oscillator interface for cost-sensitive embedded control. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces (timers, I/O, communications). The PIC16C5X family occupies the lowest tier of Microchip's 8-bit PIC architecture hierarchy (MCU -> microcontroller -> 8-bit MCU -> PIC16 -> PIC16C5X baseline), using a 12-bit-wide instruction set with 33 single-cycle opcodes. This 2:1 code compression versus typical 8-bit CISC architectures of its era made the PIC16C5X popular in high-volume, ROM/EPROM-driven appliance and industrial control designs. Key features of this variant include 20 MHz maximum clock speed, 12 I/O pins shared with peripheral functions, a hardware watchdog timer for unattended operation, and OTP program memory suited for low-volume production runs where in-field updates are not required. The 'I' suffix denotes an industrial operating range of -40 °C to +85 °C, while 'CT' identifies tape-and-reel packaging and '20' the 20 MHz speed grade. OTP parts replace the older UV-erasable windowed CERDIP PIC16C54, eliminating the quartz erase window for surface-mount assembly. Architecturally, the PIC16C54C uses a Harvard RISC core with a 2-stage pipeline, two 8-bit file registers, an 8-bit ALU, and a dedicated hardware stack. The OTP program memory is written once via standard Microchip device programmers; field updates require device replacement. The external oscillator mode supports RC, XT, LP, and HS oscillator types with appropriate passive component selection, giving designers flexibility between low-power (LP, ~32 kHz) and high-speed (HS, 20 MHz) operation. Typical applications include low-cost appliance controllers (washing machines, microwave ovens, HVAC fan controls), simple sensor interfaces, LED driving sequences, and battery-backed alarm or timing subsystems. Industrial-grade parts are also deployed in factory automation auxiliary controls where extended temperature tolerance and long-term Microchip supply commitments are valued over the latest peripheral mix. When designing with this MCU, reserve RA0-RA3 and RB0-RB7 for general digital I/O and verify the chosen oscillator mode against the supply voltage and frequency expected. Ensure decoupling is placed within 5 mm of VDD/VSS pins, and program the CONFIG word for the correct oscillator and watchdog behavior before the first OTP write, since OTP memory cannot be re-programmed.

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PIC16C54T-10/SO - 8-bit OTP MCU, 768B, 12 I/O, 10MHz SOIC-18
PIC16C54T-10/SO

PIC16C54T-10/SO - 8-bit OTP MCU, 768B, 12 I/O, 10MHz SOIC-18

The Microchip PIC16C54T-10/SO is an EPROM/ROM-based 8-bit CMOS microcontroller in the PIC16C5x family, offered in an 18-pin SOIC (SO) package with a 10 MHz oscillator input. It integrates 768 bytes of OTP program memory, 25 bytes of general-purpose RAM, and 12 digital I/O pins, providing a compact footprint for simple control loops and cost-sensitive embedded designs. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, program memory, data RAM, and peripheral I/O on one silicon die. Within the broader hierarchy, an MCU sits below microprocessors and above discrete logic; the PIC16C5x family further specializes as a baseline, OTP-based architecture optimized for simple state-machine replacement and legacy designs. The 'C' in the part number denotes the CMOS process, '54' identifies the specific family variant, 'T' indicates tape-and-reel packaging, '10' specifies the 10 MHz maximum oscillator frequency, and 'SO' marks the SOIC-18 package option. Key specifications include 12 I/O pins capable of sourcing/sinking up to 25 mA per pin (suitable for direct LED drive), an operating voltage range of 2.5 V to 6.25 V over the commercial temperature grade, and a two-stack, 12-bit instruction word RISC architecture that delivers roughly 5 MIPS at 10 MHz. The device integrates a Power-On Reset (POR), Device Reset Timer (DRT), and a Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable brown-out recovery without external components. The architecture features a Harvard-style separate code and data bus, 33 single-word/12-bit instructions, and a two-level deep hardware stack. The OTP (one-time-programmable) EPROM cell means firmware is programmed once and cannot be field-updated, which makes this part suited for high-volume production where code stability is paramount and field reprogramming is unnecessary. Typical applications include appliance control boards, simple sensor interfaces, remote-control transmitters, fan/light controllers, and white-goods user-interface modules. The 25-byte RAM suits it for shallow loops such as button debounce, pulse counting, and PWM-driven motor timing rather than complex protocol stacks. When designing with the PIC16C54T-10/SO, note that the SOIC-18 package is the surface-mount counterpart to the PDIP-18 footprint. Engineers migrating from the legacy ceramic-window JW part need to verify that code previously developed for the JW device maps to the OTP memory map of the SO variant without modification. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet, helping sourcing engineers evaluate PIC16C54 family availability and second-source risk.

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PIC16C54T-10E/SO - 8-Bit 10MHz OTP MCU, 768B | Microchip
PIC16C54T-10E/SO

PIC16C54T-10E/SO - 8-Bit 10MHz OTP MCU, 768B | Microchip

The Microchip Technology PIC16C54T-10E/SO is an 8-bit RISC microcontroller from the PIC® 16C family, featuring 768 bytes of OTP (One-Time Programmable) program memory organized as 512 x 12 bits, 25 bytes of RAM, and a 10 MHz maximum operating frequency. It is housed in an 18-pin SOIC (Small-Outline IC, gull-wing, 7.50 mm body width) surface-mount package and includes 12 I/O pins with an external interrupt capability. The -10 speed grade corresponds to a 10 MHz maximum clock input and a 200 ns single-cycle instruction execution time (program branches require two cycles, 400 ns). A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripherals such as timers and I/O onto one silicon die. Within the broader taxonomy, the PIC16C54 is a Harvard-architecture 8-bit MCU from the mid-1990s PIC16C5x family, positioned below 16-bit and 32-bit MCUs but offering the low cost and simplicity needed for high-volume embedded control. OTP variants like this one are programmed once at production time and are used in cost-sensitive products where field firmware updates are not required. Key features include a 12-bit instruction word (delivering ~2:1 code compression over typical 8-bit CISC MCUs), a RISC core with only 33 single-word instructions to learn, Power-On Reset (POR), a Watchdog Timer (WDT) for runaway code recovery, and an extended ('E') temperature grade for industrial environments. The 18-SOIC package provides a small footprint (~11.5 x 7.5 mm) suitable for hand-soldered prototypes and automated SMT lines alike. The 'T' suffix denotes Tape and Reel packaging for high-volume assembly. Typical applications include automotive body electronics, appliance control boards, simple sensor interfaces, remote controls, LED drivers, low-cost toys, and replacement of discrete logic in legacy designs. The PIC16C54 is well suited to tasks that do not require A/D conversion, serial communications, or large memory - these peripherals belong to later PIC16Cxx derivatives. With only 12 I/O pins and 25 bytes of RAM, the MCU is best matched to glue-logic replacement and small-state-machine use cases. When designing with this part, ensure your firmware fits within 768 bytes (512 instructions). Plan I/O assignments around the shared port-A and port-B structure, and budget for the WDT and POR behavior during power-up. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C54T-10E/SS - 8-Bit OTP MCU 10MHz 768B 20-SSOP | Microchip
PIC16C54T-10E/SS

PIC16C54T-10E/SS - 8-Bit OTP MCU 10MHz 768B 20-SSOP | Microchip

The Microchip Technology PIC16C54T-10E/SS is an 8-bit OTP (One-Time Programmable) CMOS microcontroller from the PIC16C5X family, delivering 10 MHz core clock performance in a 20-pin SSOP package. It integrates 768 bytes of program memory (organized as 512 x 12-bit wide instructions), 25 bytes of data RAM, and 12 digital I/O pins in a RISC architecture designed for high code density and deterministic execution. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral I/O on one silicon die. The PIC16C5X belongs to the legacy OTP/EPROM-based CMOS MCU family in the broader 8-bit microcontroller taxonomy: microcontroller -> embedded controller -> semiconductor. It uses 12-bit wide instructions and a 33-instruction RISC set, achieving 2:1 code compression over many competing 8-bit MCUs in its class, which lowers program-memory consumption per application function. Key features include single-cycle instruction execution (200 ns at 10 MHz, except program branches which are two-cycle), a fully static CMOS core, and an operating voltage range suited to 5V systems. The 10 MHz clock input directly supports a 200 ns instruction cycle, and the device draws low operating current typical of the PIC16C5X generation, making it suitable for cost-sensitive embedded control. OTP memory allows one-time programming at production, which simplifies BOM and reduces per-unit cost versus windowed or Flash variants. Typical applications include industrial automation controllers, appliance and consumer-electronics control boards, automotive body and accessory subsystems, simple sensor-interface modules, and low-cost replacement of discrete logic. The 20-SSOP footprint supports compact surface-mount designs while retaining accessible I/O for hand-wired prototypes and ATE fixtures. When designing with this part, evaluate the OTP constraint up-front: firmware cannot be field-updated, so production programming and test coverage must be complete before shipment. For new designs that require in-system reprogrammability or longer product lifecycle, evaluate Flash-based PIC16F equivalents in the same SSOP-20 footprint.

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PIC16C54T-HS/SO - 8-Bit 20MHz OTP MCU 768B | Microchip
PIC16C54T-HS/SO

PIC16C54T-HS/SO - 8-Bit 20MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54T-HS/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, 25 bytes of RAM, and 12 digital I/O pins, housed in an 18-pin SOIC (SO) surface-mount package. The "HS" suffix denotes the High-Speed oscillator option, supporting an external clock input up to 20 MHz that yields a 200 ns instruction cycle; the "T" suffix denotes Tape-and-Reel packaging for high-volume assembly, while "/SO" specifies the 0.295-inch (7.50 mm) wide SOIC footprint. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O peripherals into one device. The PIC16C54 sits at the bottom of the classic PIC16C 8-bit family, using a RISC instruction set where 33 single-word instructions execute in one cycle (200 ns at 20 MHz), except for program branches which take two cycles. It belongs to the broader category hierarchy of microcontroller → microprocessor → integrated circuit → semiconductor, and is built on EPROM/ROM-based CMOS process technology that delivers fully static operation for low power and wide operating flexibility. Key features include a 12-bit instruction word, 8-bit-wide data path, 8-level hardware stack, power-on reset, watchdog timer, and an operating voltage range of 4.5 V to 5.5 V. The device supports a commercial temperature range of 0 °C to +70 °C. Its internal architecture features separate instruction and data buses (Harvard architecture), allowing instruction fetch and data access to occur simultaneously for predictable throughput. Typical applications span low-cost embedded control in consumer electronics, industrial automation, automotive subsystems (non-safety), and legacy replacement boards where a simple 8-bit controller is sufficient. The 12 I/O pins can directly drive LEDs, relays, and logic-level interfaces, while the EPROM program memory supports one-time programming for production volumes. When designing with the PIC16C54T-HS/SO, ensure the external oscillator circuit matches the HS mode specification (typically a 20 MHz crystal with load capacitors). Decouple VDD with a 0.1 µF ceramic capacitor placed close to the pin, and leave the MCLR pin connected through the recommended reset network. The OTP memory cannot be electrically erased, so firmware must be fully verified before programming. This page synthesizes distributor pricing, drop-in 18-SOIC alternatives from the same PIC16C5x family, and practical design guidance not consolidated on any single manufacturer or distributor page.

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PIC16C54T-HSE/SO - 16MHz 8-Bit CMOS OTP MCU | Microchip
PIC16C54T-HSE/SO

PIC16C54T-HSE/SO - 16MHz 8-Bit CMOS OTP MCU | Microchip

The Microchip Technology PIC16C54T-HSE/SO is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5x family, housed in an 18-pin SOIC package and supplied on tape and reel. The HSE suffix designates a 16MHz maximum clock input with high-speed oscillator and EPROM program memory. According to the Microchip datasheet, the device delivers up to 16MHz core speed, 768 bytes (512 x 12) of OTP program memory, and 25 bytes of data RAM in a compact 18-SOIC outline suitable for surface-mount assembly. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripheral interfaces on one silicon die. The PIC16C5x family is an early RISC architecture featuring 33 single-word instructions and a 12-bit-wide instruction word, achieving 2:1 code compression over competing 8-bit controllers in its class. The PIC16C54T-HSE/SO sits within the broader taxonomy: microcontroller -> 8-bit MCU -> RISC MCU -> PIC16 family -> PIC16C5x sub-family -> PIC16C54 device, and is fabricated in CMOS for low-power operation across an automotive-grade temperature range. Key features include 12 general-purpose I/O lines, a 200ns single-cycle instruction time, a 4.5V to 5.5V supply range, and 16MHz maximum oscillator input. The 33-instruction RISC set and 12-bit program word keep firmware compact, while 25 bytes of RAM support small state machines and simple control loops. The device supports two-cycle program branches and one-cycle execution on all other instructions, simplifying deterministic timing analysis. EPROM-based program memory enables windowed reprogramming during development but is one-time-programmable in production SOIC variants. Typical applications include industrial automation, consumer electronics, automotive subsystems, and simple embedded control where deterministic timing, low cost, and small footprint matter most. Designers commonly use this part for sensor interfaces, keypad controllers, LED drivers, and low-speed communication bridges. The extended -40C to +125C operating range qualifies the part for under-hood and factory-floor environments where commercial-grade parts would otherwise fail. When designing with this device, note that the OTP memory window is not present on the SOIC package - firmware must be fully verified before final programming. Decoupling capacitors must be placed within 5mm of VDD/VSS pins, and unused I/O should be configured as outputs low to minimize current draw. The 200ns instruction cycle allows software UART bit-banging at common baud rates up to 115200 bps with appropriate interrupt handling. This page synthesizes distributor pricing, OTP-vs-EPROM trade-offs, drop-in alternatives from the PIC16C5x family, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C54T-HSE/SS - 8-Bit OTP MCU, 20MHz, 768B EPROM | Microchip
PIC16C54T-HSE/SS

PIC16C54T-HSE/SS - 8-Bit OTP MCU, 20MHz, 768B EPROM | Microchip

The Microchip Technology PIC16C54T-HSE/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering 768 bytes of one-time programmable (OTP) program memory in a 20-pin SSOP package. It executes instructions at 20 MHz through a 200 ns single-cycle pipeline, with 12 I/O pins, 25 bytes of RAM, and a 12-bit-wide instruction word. The device operates from a 4.5 V to 5.5 V supply and is qualified to automotive temperature grades (HSE suffix). A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + RAM), and peripherals on one die. Within the broader taxonomy, the PIC16C54 belongs to the 8-bit MCU class, which sits below 16-bit, 32-bit, and 64-bit controllers. The PIC16C5X family uses a RISC (Reduced Instruction Set Computer) architecture with only 33 single-word/single-cycle instructions, simplifying code generation and execution. Microcontrollers are the foundational building blocks of embedded systems, found in everything from toys to automotive ECUs. Key features include 33 single-word instructions (all single-cycle except program branches, which are two-cycle), 12 bidirectional I/O ports, an 8-bit real-time clock/counter (RTCC) with programmable prescaler, a power-on reset (POR) circuit, and a watchdog timer (WDT) for reliable operation in noisy environments. The device supports an external oscillator and includes an EPROM-based program memory for one-time field programming. The PIC16C54 uses a Harvard architecture with separate program and data buses, allowing instruction fetch and operand access to occur in the same cycle. Its CMOS process delivers low static current consumption, and the device is fully static, enabling the clock to be stopped without losing register state. This makes the part well-suited to battery-friendly or event-driven designs. Typical applications include automotive body electronics, simple sensor interface controllers, low-cost consumer appliances, replacement of discrete logic in glue applications, and small electromechanical control loops. The automotive-grade HSE temperature variant (-40 C to +125 C) is suitable for under-hood and cabin modules. When designing with the PIC16C54, ensure the MCLR (master clear) reset pin is properly pulled high and that the in-circuit serial programming (ICSP) interface is accessible if firmware updates are required after PCB assembly. The OTP memory cannot be erased, so use an OTP version only when code is fully validated; for development, a windowed CERDIP (JW) variant is recommended. This page synthesizes distributor pricing, drop-in alternative listings, and practical design notes that are not typically consolidated on a single manufacturer page, providing an engineer-focused reference for sourcing and design-in decisions.

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PIC16C54T-LP/SO - 8-Bit 40MHz OTP MCU 768B | Microchip
PIC16C54T-LP/SO

PIC16C54T-LP/SO - 8-Bit 40MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54T-LP/SO is an 8-bit OTP (One-Time Programmable) microcontroller from the PIC16C5x family, featuring a 40MHz core processor with a 200 ns instruction cycle in an 18-pin SOIC (0.295", 7.50mm width) package. The 'T' suffix denotes Tape & Reel packaging, the 'LP' indicates the low-power 20MHz maximum clock variant, and '/SO' specifies the 18-SOIC surface-mount form factor. The device integrates 768 bytes of OTP program memory organized as 512 x 12 bits and 25 bytes of RAM, 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 silicon die. The PIC16C5x family employs a RISC architecture with only 33 single-word, single-cycle instructions, making it one of the most compact instruction sets among 8-bit MCUs. These devices fall within the broader microcontroller hierarchy: 8-bit MCU -> RISC MCU -> embedded controller -> semiconductor IC, occupying the low-cost, high-performance tier of Microchip's portfolio. Key features include a wide operating voltage range of 2.5 V to 6.25 V, 12 I/O pins, an 8-bit timer/counter, and a 2-level hardware stack. The 33-instruction RISC core delivers deterministic 200 ns instruction execution at 20 MHz, eliminating the need for pipelining complexity in resource-constrained designs. Power consumption is minimized by the LP (low-power) process technology, supporting battery-backed and energy-harvesting applications. The PIC16C54T-LP/SO uses 12-bit-wide instruction words and a Harvard memory architecture separating program and data paths. With OTP program memory, each device is programmed once at production time and cannot be re-flashed, making it suited for high-volume, cost-sensitive applications where firmware is finalized. The 18-SOIC package offers hand-solderable accessibility for prototyping while remaining compatible with automated SMT lines. Typical applications include consumer electronics remote controls, appliance controllers, low-end sensor interfaces, LED driver controllers, and replacement of discrete logic in cost-sensitive products. Designers favor this part when code space (under 512 instructions) and RAM (25 bytes) are sufficient and when unit cost per MCU must be minimized. When designing with the PIC16C54T-LP/SO, ensure your code fits within 512 12-bit instruction words, since OTP memory cannot be erased or rewritten. Programming is performed via Microchip's PICkit or MPLAB ICD tools. For new designs, the PIC16F54 flash-based equivalent is recommended unless OTP cost savings are essential. This page synthesizes distributor pricing, drop-in same-package alternatives, and engineering design notes not found in the manufacturer datasheet.

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PIC16C54T-LP/SS - 8-Bit 40MHz OTP MCU 768B | Microchip
PIC16C54T-LP/SS

PIC16C54T-LP/SS - 8-Bit 40MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C54T-LP/SS is an 8-bit RISC microcontroller from the PIC16C5X family operating at up to 40 MHz, housed in a 20-pin SSOP (Shrink Small Outline Package) with Tape & Reel packaging. It integrates 768 bytes of One-Time Programmable (OTP) EPROM program memory organized as 512 x 12-bit words, 25 bytes of general-purpose RAM, and a 12-bit instruction set optimized for compact code density. The 'T' suffix indicates tape and reel packaging, 'LP' denotes the low-power CMOS process variant, and '/SS' specifies the 20-pin SSOP footprint. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and programmable I/O on a single die. The PIC16C5X family belongs to Microchip's original PIC (Peripheral Interface Controller) architecture, which uses a Harvard RISC design with separate program and data buses. Within the broader taxonomy, PIC16C5X sits as: 8-bit MCU -> RISC microcontroller -> embedded controller -> semiconductor IC. OTP memory means each device can be programmed once and retains code without power, making this family well-suited to cost-sensitive volume production where firmware is finalized at manufacturing. Key features of the PIC16C54T-LP/SS include: 12 I/O pins with individual direction control, Power-On Reset (POR) for reliable cold-start behavior, Watchdog Timer (WDT) for fault recovery, an internal RC oscillator option, and a wide operating voltage range of 2.5 V to 6.25 V (3.3 V/5 V typical). The device uses a 12-bit instruction word and a two-stage pipeline, achieving near single-cycle execution for most instructions. Commercial temperature grade (0 °C to +70 °C) makes it appropriate for consumer and industrial-grade products with controlled thermal environments. From an architectural standpoint, the PIC16C54 uses a modified Harvard architecture with 33 single-word instructions. The core runs synchronously and is fully static, allowing the clock to be halted for power saving. With 25 bytes of RAM and only two hardware registers (W register and file select register), the device targets simple control loops, sensor interfacing, and discrete logic replacement. The /SS package variant offers a narrower 5.30 mm body width compared to standard SOIC, enabling higher PCB density. Typical applications include low-cost remote controls, appliance control boards, LED drivers, battery chargers, security keypads, simple sensor interfaces, and hobbyist/Maker projects where a small pin-count MCU with deterministic interrupt response is sufficient. Designers migrating from older discrete logic often adopt this part to consolidate timing, sequencing, and I/O functions onto a single chip. When laying out a PCB for the PIC16C54T-LP/SS, place a 0.1 µF decoupling capacitor as close as possible to the VDD pin and provide a short ground return to VSS. For crystal operation, keep the crystal and load capacitors within a few millimeters of the OSC1/OSC2 pins to minimize startup issues. Designers should also budget for the OTP programming window in the production test plan. This page synthesizes distributor stock, verified pin-compatible alternatives, and engineering design notes that go beyond the manufacturer datasheet to help buyers and embedded engineers qualify the part faster.

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PIC16C54T-LPE/SS - 8-bit 40MHz 768B OTP MCU 20-SSOP | Microchip
PIC16C54T-LPE/SS

PIC16C54T-LPE/SS - 8-bit 40MHz 768B OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16C54T-LPE/SS is an 8-bit CMOS ROM-based microcontroller from the PIC16C5x family, featuring a 20 MHz maximum clock input (40 MHz internal core equivalent per the source listing), 768 bytes of One-Time-Programmable (OTP) program memory organized as 512 × 12, and 25 bytes of data RAM, housed in a 20-pin SSOP package. Tape and reel orientation is indicated by the "T" suffix, while "LPE" denotes low-power extended voltage and the SSOP package code. An OTP microcontroller is a single-chip microprocessor whose program memory can be written exactly once by the user and then behaves as read-only ROM thereafter. OTP MCUs sit within the broader hierarchy: microcontroller (MCU) -> embedded controller -> semiconductor IC. The PIC16C5x architecture uses a Harvard-style RISC core with a fixed 12-bit instruction word, achieving 2:1 code compression versus typical 8-bit CISC alternatives, and offers only 33 single-word instructions to learn. Key features of the PIC16C54T-LPE/SS include 12 I/O pins, Power-On Reset (POR), Watchdog Timer (WDT) with its own on-chip RC oscillator, code protection, and a wide operating voltage range of 2.5 V to 6.25 V. The device executes most instructions in a single 200 ns cycle (one oscillator period of four clocks), with program branches taking two cycles. Its CMOS design keeps supply current low and provides high noise immunity, ideal for battery-backed and cost-sensitive appliances. The architecture combines a simple RISC datapath with on-chip EPROM/OTP program memory and dedicated peripheral blocks, eliminating the need for external program storage or complex glue logic. Because the PIC16C5x core lacks interrupts, all timing is handled by polling and the watchdog timer, simplifying deterministic control loops in cost-sensitive designs. Typical applications include consumer appliance control, simple remote-control transmitters, sensor signal conditioning front-ends, low-end automotive subsystems, battery chargers, and toy electronics. The OTP memory suits high-volume production where software is finalized. Designers should allocate a 0.1 µF decoupling capacitor close to VDD and follow Microchip's recommended oscillator layout to avoid start-up failures. The low-power "LPE" variant extends the operating voltage range for use with 2×AA cells or 3.3 V regulated rails. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C54T-LPI/SO - 8-Bit 40MHz OTP MCU, 768B, 18-SOIC | Microchip
PIC16C54T-LPI/SO

PIC16C54T-LPI/SO - 8-Bit 40MHz OTP MCU, 768B, 18-SOIC | Microchip

The Microchip Technology PIC16C54T-LPI/SO is an 8-bit, ROM/EPROM-based CMOS microcontroller from the PIC16C5x family, offering a 40 MHz maximum operating frequency with 200 ns single-cycle instruction execution. The device integrates 768 bytes of one-time programmable (OTP) program memory (512 x 12-bit words) and 25 bytes of general-purpose RAM in a 18-pin SOIC (SO) package suitable for surface-mount assembly. What is an OTP microcontroller? An OTP (One-Time Programmable) microcontroller is a type of embedded controller that uses non-volatile memory which can be written only once after manufacture. Unlike flash-based MCUs that allow many erase/write cycles, OTP parts are programmed a single time at production and are typically lower cost, making them well suited for high-volume, cost-sensitive applications where firmware is finalized before production. OTP microcontrollers belong to the broader hierarchy of microcontrollers -> embedded controllers -> microprocessors -> semiconductor ICs. Key features include 12 I/O pins supporting bidirectional digital I/O, a programmable Watchdog Timer (WDT) for runaway code recovery, Power-On Reset (POR) for reliable cold-start behavior, and an internal oscillator option for designs that minimize external component count. The PIC16C5x RISC architecture provides 33 single-word instructions, of which all execute in a single 200 ns cycle except program branches (two cycles), giving C-code-density 2:1 compression versus typical 8-bit CISC microcontrollers in its class. Technical depth: the part runs from a 4.5V to 5.5V supply, supports an external clock up to 20 MHz (yielding 200 ns instruction cycle time), and includes a brown-out/reset path. The industrial-grade temperature variant (the "I" suffix in LPI) operates from -40 °C to +85 °C. Because the device is OTP, firmware must be fully validated before programming; field updates are not possible without a hardware swap. Typical applications include low-cost appliance controllers, remote-control transmitters, simple sensor interfaces, LED driving, and small consumer-electronic subsystems. The PIC16C54T-LPI/SO fits particularly well when deterministic timing, a tiny code footprint, and a minimal BOM are higher priorities than in-system reprogrammability. A key design consideration is choosing OTP over flash: OTP units ship at lower per-piece cost and offer a more secure code image, but they cannot be re-burned during board bring-up, so engineering development should use a JW or QTP equivalent. This page synthesizes distributor pricing, drop-in same-package alternatives (PIC16C54C-04/SO, PIC16C54A-20/SO, PIC16C54CT-20I/SO, PIC16C54-LPI/SO, PIC16C54T-LP/SO), and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C54T-RC/SO - 8-bit 4MHz OTP MCU, 768B | Microchip
PIC16C54T-RC/SO

PIC16C54T-RC/SO - 8-bit 4MHz OTP MCU, 768B | Microchip

The Microchip PIC16C54T-RC/SO is a member of the PIC16C5X family of low-cost, high-performance 8-bit fully-static EPROM/ROM-based CMOS microcontrollers, delivering 4 MHz CPU performance with 768 bytes of OTP program memory (organized as 512 x 12-bit words) and 25 bytes of general-purpose RAM in an 18-pin SOIC package. The 'T' suffix indicates Tape and Reel packaging, the 'RC' suffix denotes the oscillator type (external RC oscillator with up to 4 MHz CPU clock), and 'SO' designates the 18-lead Small Outline Integrated Circuit (SOIC-18) surface-mount package. Commercial temperature grade (0C to +70C) supports standard office and consumer environments. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable I/O peripherals. Within the broader semiconductor taxonomy, microcontrollers sit under microprocessors and, more broadly, under digital ICs and integrated circuits. The PIC16C5X family, also known as the PIC16C5x baseline architecture, uses a RISC-style Harvard architecture with a fixed 12-bit instruction word, which yields approximately 2:1 code compression versus competing 8-bit CISC microcontrollers and simplifies firmware development. Key features include 12 I/O pins with individual direction control, an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, a watchdog timer with its own on-chip RC oscillator for reliable resets, power-on reset, power-saving SLEEP mode, and a wide 2.5V to 6.25V operating voltage range. Code protection bit prevents unauthorized memory reads. The Harvard bus keeps program and data paths separate for predictable single-cycle instruction execution, except for program branches which take two cycles. Architecturally, the device uses a 12-bit program counter to address up to 2K x 12 of OTP/EPROM memory and 32 x 8 of file registers (special function plus general-purpose RAM). CMOS fabrication provides low power consumption - typical supply current is below 2 mA active and under 4 uA in SLEEP - enabling battery-friendly designs. Typical applications include low-cost consumer appliances, simple logic replacement, timer/counter subsystems, sensor front-ends, and remote control transmitters. The SOIC-18 footprint also makes it usable as a substitute for legacy 18-pin discrete logic circuits in maintenance and retrofits. Pair with a PICkit programmer and MPLAB X IDE for development. For reliable operation, place a 0.1 uF decoupling capacitor close to the VDD pin and choose the RC oscillator timing components (R, C) according to the datasheet frequency chart to keep CPU clock within tolerance. This page synthesizes distributor pricing, drop-in alternatives, and engineering design notes that go beyond the manufacturer datasheet by adding comparison context, selection guidance, and practical layout recommendations.

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PIC16C54T-RC/SS - 4MHz 8-Bit OTP MCU 768B | Microchip
PIC16C54T-RC/SS

PIC16C54T-RC/SS - 4MHz 8-Bit OTP MCU 768B | Microchip

The Microchip Technology PIC16C54T-RC/SS is an 8-bit, fully-static, EPROM/ROM-based CMOS microcontroller belonging to the PIC16C5x family, delivering 4 MHz CPU performance from 768 bytes (512 x 12) of one-time-programmable (OTP) program memory in a 20-pin SSOP (5.30 mm body width) tape-and-reel package. It operates from 3.0 V to 5.5 V across the commercial/industrial temperature range and is paired with 25 bytes of general-purpose RAM and 12 digital I/O lines. The "T" suffix denotes tape-and-reel packaging and "RC" specifies the 4 MHz resonator/RC-oscillator speed grade; "SS" indicates the 20-pin SSOP footprint. What is a PIC16C5x microcontroller? The PIC16C5x is Microchip's original low-cost, high-performance 8-bit RISC family, widely regarded as the ancestor of all modern PIC MCUs. It uses a Harvard architecture with separate program and data buses, a 12-bit-wide instruction word, and a fixed 33-instruction set. In the broader taxonomy, the PIC16C5x sits under: microcontroller -> embedded microcontroller -> 8-bit MCU -> RISC MCU -> EPROM/ROM-based MCU -> power management and control IC family. Key features include 33 single-word/single-cycle RISC instructions, 2:1 code compression versus competing 8-bit MCUs through 12-bit-wide instructions, Power-On Reset (POR), Watchdog Timer (WDT) with on-chip RC oscillator, and programmable code protection. The 12-bit instruction width yields compact code density uncommon in 8-bit parts, while the two-level deep hardware stack and 2 K x 12 program-memory address space support compact firmware designs. The PIC16C5x uses a RISC pipeline with single-cycle execution (except branches, which take two cycles), and integrates a precision 4 MHz internal RC-style oscillator reference. With a 4 MHz clock and 4 Tcy per instruction cycle, each instruction executes in 1 microsecond, delivering roughly 1 MIPS of throughput. The device's CMOS design provides low power consumption suitable for both battery and line-powered applications. Typical applications include appliance control, automotive body electronics, low-power remote sensors, security and access systems, and general-purpose embedded logic replacement. The wide 3.0 V to 5.5 V supply range and small SSOP-20 footprint make it well-suited for cost-sensitive, space-constrained designs. When designing with the PIC16C5x, ensure the OTP-programmed firmware is finalized before volume production - the "C" ROM family is one-time-programmable, so any firmware change requires a new part. Use the WDT for unattended recovery from software or hardware faults, and add 0.1 uF ceramic bypass capacitors near VDD/SS for stable operation. This page synthesizes distributor pricing, drop-in alternatives from the PIC16C5x family and competitive 8-bit MCUs, application examples, and practical design notes not found in the manufacturer datasheet.

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PIC16C54T-RCE/SO - 8-Bit OTP MCU, 4MHz, 18-SOIC | Microchip
PIC16C54T-RCE/SO

PIC16C54T-RCE/SO - 8-Bit OTP MCU, 4MHz, 18-SOIC | Microchip

The Microchip Technology PIC16C54T-RCE/SO is a member of the PIC16C5X family of low-cost, high-performance 8-bit fully-static EPROM/ROM-based CMOS microcontrollers, operating at up to 4 MHz (200 ns instruction cycle) in an 18-pin SOIC package supplied in Tape & Reel. The T-suffix indicates tape-and-reel packaging, /RCE denotes the extended (E) temperature grade, and /SO designates the 18-SOIC (7.50 mm) footprint. An 8-bit microcontroller (MCU) is a small single-chip computer that integrates a CPU, program memory, RAM, and peripheral I/O on a single die, executing instructions from on-chip program memory. Within the taxonomy, the PIC16C54 belongs to the hierarchy: microcontroller -> 8-bit MCU -> CMOS RISC MCU -> PIC16C5X family -> PIC16C54 sub-family, in the broader power management and embedded control semiconductor category. The /RCE ROMless/OTP one-time-programmable version is optimized for low-volume and prototype designs where field reprogrammability is not required. Key features include 768 bytes (512 x 12) of OTP program memory, 25 bytes of general-purpose RAM, 12 digital I/O pins, a 33-instruction RISC instruction set, a hardware Watchdog Timer (WDT), Power-On Reset (POR), and an external oscillator interface. Single-cycle instruction execution (except program branches) and 12-bit-wide opcodes produce 2:1 code compression versus competing 8-bit MCUs, an important density advantage for cost-sensitive applications. Supply voltage spans 3.25 V to 6 V, with the /E suffix extending the operating range to -40C to +125C. Typical applications include appliance control, automotive body electronics, smart sensors, low-end remote controls, battery chargers, and simple LED driver controllers. The 18-SOIC footprint also supports hand-soldering in prototypes and small-series industrial systems. The RISC architecture enables deterministic interrupt response and predictable timing for hard-real-time loops, while the small code footprint allows the 512-word OTP window to absorb full application logic in many designs. When designing with the PIC16C54T-RCE/SO, observe the 6 V absolute-maximum VDD rating, provide a 0.1 uF decoupling capacitor close to VDD, and select an external clock source that meets the 4 MHz specification. Because OTP memory cannot be re-programmed, the JW (windowed) variant is recommended for firmware development and the C-revision mask set is recommended for production.

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PIC16C54T-RCE/SS - 8-Bit OTP MCU, 4MHz, 768B ROM | Microchip
PIC16C54T-RCE/SS

PIC16C54T-RCE/SS - 8-Bit OTP MCU, 4MHz, 768B ROM | Microchip

The Microchip PIC16C54T-RCE/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, delivering up to 4 MHz instruction execution in a compact 20-pin SSOP package. According to Microchip datasheet DS30189S, the device integrates 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 25 bytes of general-purpose RAM, with 12 digital I/O pins arranged on two ports (PORTA 4-bit, PORTB 8-bit). The 'T' suffix denotes tape-and-reel packaging; 'RC' identifies the 4 MHz RC-oscillator speed grade; 'E' marks the extended industrial temperature range (-40C to +125C). An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on one die. The PIC16C5X family sits inside the broader taxonomy: microcontroller → embedded processor → semiconductor IC. These legacy RISC MCUs use a Harvard architecture with separate program and data buses, a 12-bit instruction word, and only 33 single-word instructions - making them among the simplest to program of any 8-bit MCU. OTP memory is field-programmable but not erasable, targeting cost-sensitive volume production where firmware is final. Key features include a 200 ns single-cycle instruction execution (4 MHz), a 33-instruction RISC instruction set, a programmable watchdog timer with on-chip RC oscillator, an 8-bit real-time clock/counter with 8-bit prescaler, and power-on reset. The PORTA pins are multiplexed with the device's analog comparator reference and RTCC, while PORTB provides eight bidirectional digital I/O lines with programmable weak pull-ups. The device operates from 3.25 V to 6.0 V and is well suited to battery-powered and 5 V regulated designs. The PIC16C54 implements a RISC pipeline that fetches and executes each instruction in a single clock cycle (except branches, which take two). This two-stage pipeline is what gives the family its deterministic 200 ns instruction cycle at 4 MHz. The internal architecture separates EPROM program memory (12-bit wide) from RAM data memory (8-bit wide), allowing simultaneous instruction fetch and data access. The result is a low-MIPS-per-mW footprint that suits small, latency-sensitive control loops. Typical applications include low-cost consumer appliances, remote-control transmitters, sensor signal conditioning, small motor and solenoid drivers, and general-purpose logic replacement where a state-machine or delay timing function replaces discrete 74HC logic. Industrial uses include HVAC damper control, lighting ballast timing, and simple panel-meter drivers where only a handful of I/O lines are needed. When designing with the PIC16C54, observe that OTP memory cannot be re-programmed in-circuit, so plan to use the JW ceramic-windowed version for prototype code iteration and migrate to OTP or mask-ROM (CR suffix) for production. The SSOP-20 package's thermal resistance allows operation up to +125 C ambient, but consider the 5 V/4 MHz performance envelope when porting firmware from newer PIC16F1xxx parts. This page synthesizes distributor pricing, drop-in OTP PIC16C5X alternatives, and practical design notes that go beyond the manufacturer datasheet. The PIC16C54T-RCE/SS belongs to a long-running family with abundant code examples and reference designs in Microchip application notes AN545, AN556, and the Embedded Control Handbook.

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PIC16C54T-RCI/SO - 8-bit OTP MCU, 768B ROM, 25B RAM, SOIC-18 | Microchip
PIC16C54T-RCI/SO

PIC16C54T-RCI/SO - 8-bit OTP MCU, 768B ROM, 25B RAM, SOIC-18 | Microchip

The Microchip Technology PIC16C54T-RCI/SO is a member of the PIC16C5X family of EPROM/ROM-based 8-bit CMOS microcontrollers, packaged in an 18-pin SOIC (SO) wide-body surface-mount package. It integrates 768 bytes of One-Time-Programmable (OTP) program memory, 25 bytes of data RAM, and 12 configurable I/O pins, all driven by a RISC instruction set of only 33 single-word instructions. The "RC" oscillator suffix designates an external resistor/capacitor oscillator mode, while "I" denotes the industrial operating temperature range of -40C to +85C, and the "T" suffix indicates tape-and-reel packaging. What is a PIC16C5X microcontroller? It is one of the earliest generations of Microchip's PIC microcontrollers, originally introduced in the late 1980s and still in production for legacy and cost-sensitive embedded designs. PIC microcontrollers occupy the broader category hierarchy of microcontroller -> embedded controller -> semiconductor device. They use a Harvard architecture, separate program and data buses, and a RISC instruction set that allows most instructions to execute in a single 200 ns instruction cycle at a 20 MHz clock input. Key features of the PIC16C54T-RCI/SO include a 200 ns instruction cycle, single-cycle arithmetic and logic instructions (only program branches take two cycles), a 4.5 V to 5.5 V single-supply operating range, and a maximum clock input of 20 MHz. The device includes a programmable watchdog timer, a power-on reset (POR), and a 12-bit-wide instruction word that achieves approximately 2:1 code compression over competing 8-bit architectures of the era. The 12 I/O pins are bidirectional and individually programmable for direction, weak pull-up, and wake-on-change. Architecturally, the PIC16C54 uses a 12-bit program counter and a separate 5-bit register file selector. The RC oscillator mode allows the system clock to be generated by an external resistor and capacitor, trading frequency accuracy for the lowest possible bill-of-materials cost - the part can run with no external resonator or crystal. The OTP EPROM program memory is programmed once and is non-erasable, making this part suitable for volume production where firmware is final. Typical applications include low-cost appliance controllers, simple sensor interfaces, RC servo controllers, dedicated peripheral controllers, and replacement of discrete logic in legacy equipment. The wide-body SOIC-18 footprint is also popular for breadboard-friendly prototype adapters and educational kits. The industrial temperature rating allows deployment in outdoor enclosures and uncontrolled industrial environments. When designing with this device, note that OTP memory cannot be re-programmed in-circuit, so code must be fully validated before committing to production units. For development and code iteration, use the windowed CERDIP PIC16C54-JW part or the flash-based PIC16F54 successor. Estimated: at 20 MHz and 5 V, typical DC current consumption is approximately 2 mA during active execution and a few microamps in sleep mode. This page synthesizes distributor pricing, drop-in same-package alternatives from Microchip's PIC16C5X family, and practical design considerations not found in the standalone manufacturer datasheet.

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PIC16C54T-RCI/SS - 8-Bit 4MHz OTP MCU, 768B | Microchip | 20-SSOP
PIC16C54T-RCI/SS

PIC16C54T-RCI/SS - 8-Bit 4MHz OTP MCU, 768B | Microchip | 20-SSOP

The Microchip Technology PIC16C54T-RCI/SS is a cost-optimized 8-bit CMOS microcontroller from the PIC16C5X family, integrating 768 bytes of One-Time-Programmable (OTP) program memory, 32 bytes of RAM, and 12 general-purpose I/O pins in a 20-pin SSOP (Shrink Small Outline Package) supplied on tape and reel. It executes 33 single-word instructions at a 200 ns instruction cycle (4 MHz oscillator input, 20 MHz max), with single-cycle execution for all instructions except program branches which are two-cycle, and operates from a 3.0 V to 6.25 V supply. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (ROM/EPROM/Flash/OTP), volatile data memory (RAM), and programmable I/O peripherals on one die. The PIC16C5X family belongs to the larger 8-bit microcontroller class, sits within the broader category of embedded microcontrollers, and falls under the umbrella of embedded processing semiconductors. Compared with 16-bit and 32-bit MCUs, 8-bit PIC devices remain attractive for cost-sensitive, deterministic, low-power control loops where peripheral complexity is modest. Key features of the PIC16C54T-RCI/SS include a RISC Harvard-architecture core with 12-bit wide instructions and 2:1 code compression versus typical 8-bit CISC competitors, a 25-entry hardware stack, a watchdog timer with its own on-chip RC oscillator, an 8-bit real-time clock/counter (RTCC) with programmable prescaler, and power-on reset plus brown-out protection. The /RC oscillator suffix indicates an external resistor/capacitor oscillator configuration, while the 'I' indicates the industrial -40C to +85C operating range. The 'T' suffix indicates tape-and-reel packaging; the '/SS' suffix specifies the 20-pin SSOP (5.30 mm body width). Architecture-wise, the PIC16C5X uses a fully static CMOS design with separate program and data buses (Harvard), allowing simultaneous instruction fetch and data access. The 12-bit instruction word plus 2:1 code compression means most instructions fit in a single 12-bit program word, yielding code density that typically exceeds CISC 8-bit alternatives. Typical applications include low-cost appliance controllers, simple sensor interfaces, LED lighting controllers, battery chargers, and replacement of discrete logic in white-goods and consumer devices. Designers choose the PIC16C54 for applications where price per unit, deterministic interrupt-free operation, and minimum external component count matter more than raw MIPS. When designing with the PIC16C54T-RCI/SS, ensure the RC oscillator R/C values stay within the datasheet's stability envelope (typically R = 3 kOhm to 100 kOhm, C > 20 pF). Add a 0.1 uF decoupling capacitor close to VDD and bulk-cap the supply rail if the load is highly dynamic. Programming must use Microchip's device programmer (e.g., PICSTART Plus or MPLAB PM3) before the OTP window closes - the part is not field-reprogrammable. This page synthesizes current distributor pricing, drop-in compatible alternatives, and practical design notes that complement the manufacturer datasheet, helping engineers evaluate sourcing options for the legacy PIC16C5X family.

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PIC16C54T-XT/SS - 8-bit OTP MCU, 4MHz, 768B, SSOP-20 | Microchip
PIC16C54T-XT/SS

PIC16C54T-XT/SS - 8-bit OTP MCU, 4MHz, 768B, SSOP-20 | Microchip

The Microchip Technology PIC16C54T-XT/SS is an 8-bit EPROM/ROM-based CMOS microcontroller in the PIC16C5X family, supplied in a 20-pin SSOP package (0.209", 5.30 mm width). It delivers up to 4 MHz CPU clock with a 200 ns single-cycle instruction time, 768 bytes (512 x 12) of one-time-programmable (OTP) program memory, 25 bytes of RAM, and 12 digital I/O pins. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and I/O peripherals in one package, designed for embedded control tasks. Within the semiconductor taxonomy, the PIC16C54T-XT/SS belongs to the hierarchy: microcontroller -> embedded processor -> digital IC -> semiconductor. The PIC16C5X family uses a 12-bit-wide instruction set with RISC architecture, achieving roughly 2:1 code compression over comparable 8-bit CISC MCUs, and it executes single-cycle instructions (200 ns at 20 MHz) with only two-cycle branches. Key differentiating specifications include the 33 single-word instruction set, 12 bidirectional I/O pins, an operating voltage range of 4.5 V to 5.5 V (some sources cite 3.3 V/5 V dual supply tolerance), and tape-and-reel packaging with 1,600-piece standard quantity. The device integrates power-on reset, watchdog timer, and a programmable code-protect bit, eliminating many external components. Typical applications include low-cost consumer appliance controllers, simple sensor interfaces, LED display drivers, hobby and education platforms, and legacy industrial control retrofits. The compact SSOP-20 footprint suits space-constrained PCB designs where the OTP memory model supports volume production without mask-ROM tooling costs. When designing with this part, note that the PIC16C5X core lacks interrupts, so polling is required. Engineers should validate the OTP programming procedure (high-voltage VPP) and use the Microchip MPLAB IDE for code development.

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PIC16C54T-XTE/SO - 8-Bit OTP MCU, 4MHz, 768B | Microchip
PIC16C54T-XTE/SO

PIC16C54T-XTE/SO - 8-Bit OTP MCU, 4MHz, 768B | Microchip

The Microchip PIC16C54T-XTE/SO is an 8-bit RISC microcontroller in the PIC16C5x family, supplied in an 18-pin SOIC wide-body package on tape and reel. It integrates 768 bytes of one-time programmable (OTP) EPROM organized as 512 words x 12 bits, 25 bytes of general-purpose RAM, and a fully static CMOS core that operates from DC up to 4 MHz. According to the Microchip product page, this device is rated for 3.3 V / 5 V operation and uses 12-bit wide instructions for 2:1 code compression versus typical 8-bit competitors, reducing overall program size for cost-sensitive embedded designs. An 8-bit microcontroller is a small single-chip computer built around a CPU, program memory, data RAM, and I/O peripherals. The PIC16C5x family belongs to the broader hierarchy: microcontroller -> MCU -> embedded processor -> semiconductor. These OTP CMOS MCUs target high-volume applications where mask-ROM cost savings are not warranted and field programmability is required. The PIC16C5x architecture uses a Harvard structure with separate program and data buses, an accumulator-based ALU, and a small two-level hardware stack, which simplifies interrupts and reduces die area compared with register-based CISC 8-bit cores. Key features of the PIC16C54T-XTE/SO include a 33-instruction set, hardware multiplier-free architecture, 12 I/O pins with individual direction control, a programmable watchdog timer with its own on-chip RC oscillator, and a power-on reset circuit. The device supports sleep mode for low-power standby and has an operating temperature range typical of industrial-grade silicon. Power consumption in active mode is on the order of a few milliamperes at 5 V/4 MHz, with standby current dropping into the microampere range when sleep is engaged. Typical applications include simple logic replacement, RC timers, sensor front-end conditioning, low-end consumer appliances, and industrial control subsystems where deterministic instruction timing and a small footprint matter more than raw throughput. The wide-body 18-SOIC (0.295 inch / 7.50 mm) gives easier hand-soldering and inspection than narrow-body SO packages, while the -XTE speed designation corresponds to the 4 MHz oscillator grade with the industrial operating range. When designing with this part, allocate sufficient decoupling on VDD/VSS, keep crystal traces short, and respect the device's low drive-strength I/O limits; for designs that require re-programmability or in-circuit debugging, consider migrating to a flash-based PIC16F equivalent in the same footprint.

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PIC16C54T-XTI/SO - 8-bit 4MHz OTP MCU, 512B EPROM | Microchip
PIC16C54T-XTI/SO

PIC16C54T-XTI/SO - 8-bit 4MHz OTP MCU, 512B EPROM | Microchip

The Microchip Technology PIC16C54T-XTI/SO is an 8-bit RISC CMOS microcontroller in the PIC16C5x family, featuring 512 words (768 bytes) of one-time-programmable (OTP) EPROM program memory and 25 bytes of data RAM, housed in an 18-pin SOIC (0.295 inch / 7.50 mm body width) package supplied on Tape & Reel. The 'XT' speed grade specifies a 4 MHz maximum oscillator input, while the 'I' suffix denotes the industrial -40C to +85C operating temperature range, and the '/SO' suffix indicates the SOIC-18 package. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral I/O on one piece of silicon. The PIC16C5x family is one of the original Microchip baseline architectures, implementing a Harvard RISC core with 12-bit-wide instructions that yield approximately 2:1 code compression over competitive 8-bit CISC devices of its class. PIC16C54 sits at the entry of the PIC taxonomy: PIC16C54 -> PIC16C5x family -> PIC baseline -> 8-bit PIC -> Microcontroller -> Semiconductor. Its simple, deterministic instruction set enables compact code development and predictable real-time interrupt response. Key features include a 4 MHz oscillator input (XT grade), 33 single-word instructions, a 12-bit instruction word, two 8-bit I/O ports (Port A and Port B, total 12 I/O pins), an 8-bit real-time clock/counter with 8-bit programmable prescaler, power-on reset, watchdog timer with on-chip RC oscillator, and code-protection EPROM. The CMOS process keeps active supply current low while supporting 3.0V to 6.25V operation (industrial variants typically 3.0V-6.25V) and offers a power-saving SLEEP mode that wakes on pin change or watchdog timeout. The PIC16C54 architecture uses a single accumulator (W register) and a two-level hardware stack, characteristic of baseline PIC devices. The Harvard memory map separates program EPROM (512 x 12) from data RAM (25 x 8) and the 7-bit file register space. The wide 12-bit instruction word allows most instructions to execute in a single instruction cycle (4 oscillator clocks), giving an effective 1 MIPS throughput at 4 MHz - adequate for logic replacement, simple sequencer, and glue-logic consolidation duties. Typical applications include logic replacement in appliance controls, RC servo and PWM generator firmware, simple sensor interface front-ends (with external ADC), automotive interior trim controls, security keypads, low-end consumer devices, and industrial timer/counter modules. The industrial -40C to +85C range plus wide 3.0V-6.25V supply tolerance makes it robust for 5V industrial environments. The OTP EPROM is suitable for low-to-medium volume production where the final firmware is fixed before release. When designing with the PIC16C54T-XTI/SO, use the Microchip MPASM assembler and MPLAB SIM/MPLAB X IDE for code development, and the MPLAB PM3 universal programmer for OTP device programming. The XT oscillator mode requires a 4 MHz crystal or ceramic resonator with the appropriate load capacitors per the datasheet. For new designs, consider migrating to the flash-based PIC16F54 in the same 18-pin SOIC footprint, which offers identical peripherals and in-circuit programmability. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that are not consolidated on a single manufacturer page.

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