Circuitos Integrados

PIC16C55-HS/P

PIC16C55-HS/P - 8-bit OTP MCU 20MHz 768B | Microchip

The Microchip Technology PIC16C55-HS/P is an 8-bit CMOS RISC microcontroller built on the PIC16C5x baseline core, offering 768 bytes of one-time programmable (OTP) program memory and 24 bytes of RAM in a 28-pin PDIP through-hole package. The -HS speed grade specifies a 20 MHz maximum clock frequency, with the part running from a 3.3 V to 5.5 V supply and providing 20 digital I/O lines. PIC16C5x instruction words are 12 bits wide against an 8-bit data path, giving roughly 2:1 code compression versus competing 8-bit MCUs. What is an 8-bit OTP microcontroller? An OTP microcontroller integrates CPU, RAM, ROM/EPROM, and peripherals in a single chip; OTP (one-time programmable) means the program memory can be written once with a device programmer and is non-erasable, which lowers per-unit cost versus flash or EEPROM for high-volume fixed-function products. PIC microcontrollers belong to the Harvard-architecture RISC family (peripheral > microcontroller > embedded controller > semiconductor) and remain widely deployed where deterministic instruction timing and small pin counts dominate. Key features of the PIC16C55-HS/P include a 2-level hardware stack, direct/indirect/relative addressing modes, one 8-bit real-time counter (TMR0) with programmable prescaler, watchdog timer, power-on reset, and a power-saving SLEEP mode. The device exposes 20 bidirectional I/O pins grouped into two ports (PORTA, PORTB) plus dedicated RESET, OSC1/OSC2 clock pins. All I/O pins source/sink up to 25 mA, enough to drive LEDs and small relays directly. Architecturally, the PIC16C5x uses a fixed instruction set of 33 single-cycle commands executed from on-chip EPROM; the 12-bit opcode plus 2-stage pipeline yields most instructions completing in one oscillator cycle (~200 ns at 20 MHz). Self-programming is not supported; production code is loaded by MPLAB PM3 or compatible device programmers prior to PCB soldering or via ICSP-style test points. Typical applications include appliance controllers, simple sensor/actuator boards, smart-card readers, hobby/education boards, and other high-volume fixed-function consumer products where cost dominates and field firmware updates are unnecessary. Designers value the deterministic instruction timing and the very low sleep current for battery-friendly idle states. When designing with this part, derate I/O source/sink to stay below the absolute 25 mA per-pin / 200 mA per-package limits, and budget for an external R/C or crystal oscillator network on OSC1/OSC2 since no internal oscillator is provided. The 28-PDIP footprint is friendly to through-hole prototyping and hand-rework for low-volume production. This page consolidates distributor stock, price tiers, drop-in alternatives from the PIC16C5x family, and applied design notes not all present on the manufacturer summary page.

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PIC16C55-HS/SP

PIC16C55-HS/SP - 8-bit CMOS MCU, 20MHz, 768B OTP, 28-SPDIP | Microchip

The Microchip Technology PIC16C55-HS/SP is an 8-bit CMOS RISC microcontroller featuring 768 bytes of OTP program memory, 24 bytes of RAM, and a 20 MHz maximum clock speed, housed in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package. The HS suffix denotes the high-speed oscillator mode, supporting external clock inputs up to 20 MHz, while the /SP suffix indicates the SPDIP package variant. According to the PIC16C5X family datasheet, the device operates from a 4.5V to 5.5V supply and delivers 12-bit wide instructions with an 8-bit data path for compact code density. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and I/O peripherals on one die. Within the broader taxonomy, the PIC16C5X belongs to the classic baseline PICmicro family, which sits below the mid-range PIC16 and enhanced PIC18 families in Microchip's product hierarchy. These baseline MCUs use a 12-bit instruction word optimized for compact code storage on small OTP or ROM memories, making them ideal for cost-sensitive, high-volume embedded control. Key features of the PIC16C55-HS/SP include seven or eight special-function hardware registers, a two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0), and four oscillator selection options (RC, XT, HS, LP). The architecture delivers roughly twice the code compression of competing 8-bit MCUs in its price class, with 20 bidirectional digital I/O lines grouped across multiple ports. The 28-SPDIP package retains drop-in compatibility with the rest of the PIC16C5X family, simplifying PCB reuse across 28-pin baseline PICmicro designs. The PIC16C55 uses a Harvard RISC architecture with separate program and data buses, executing most instructions in a single 200 ns cycle at 20 MHz. The OTP program memory supports one-time programming for production volume, while the 24-byte RAM accommodates small data sets typical of appliance, sensor, and human-interface control. The TMR0 counter with programmable prescaler, combined with the watchdog timer and power-on reset, gives designers sufficient on-chip peripherals for straightforward control loops. Typical applications include remote controls, small appliance controllers, LED lighting drivers, simple sensor interfaces, and consumer electronics where cost per node is critical. The high-speed 20 MHz oscillator mode supports timing-sensitive tasks such as IR remote protocols, while the low-power LP mode enables battery-powered devices. The 28-pin SPDIP footprint remains popular in educational, hobbyist, and legacy industrial designs. When designing with this part, choose between the HS, XT, LP, or RC oscillator modes based on clock-source frequency. The HS mode requires a 4-20 MHz crystal or external clock; LP mode enables 32 kHz low-power operation. Always decouple VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin, and reserve the MCLR pin for a proper reset network if in-circuit debugging is not required. This page synthesizes distributor pricing, drop-in baseline PIC16C5X alternatives, and practical design notes not found on a single manufacturer or distributor page, providing engineering context beyond the baseline datasheet.

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PIC16C55-HSE/SO

PIC16C55-HSE/SO - 8-bit OTP MCU, 16MHz, 768B | Microchip

The Microchip Technology PIC16C55-HSE/SO is an 8-bit PIC® 16C family microcontroller featuring a 16MHz maximum clock speed, 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, and a 28-pin SOIC (7.50 mm width) surface-mount package. It belongs to the baseline PIC16C5x family, the industry's first RISC-architecture 8-bit microcontrollers, and uses a 12-bit wide instruction set that yields roughly 2:1 code compression versus typical 8-bit CISC competitors. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, digital I/O, timers, and interrupt logic into one package. The PIC16C5x family uses a Harvard architecture with separated program and data paths, allowing instruction fetch and operand read to occur in the same cycle - this is why the baseline PIC executes nearly every instruction in a single 200 ns cycle at 20 MHz. MCUs sit at the lowest tier of embedded computing (MCU -> 8-bit microcontroller -> microcontroller -> embedded processor) and are the workhorses of appliance control, sensor reading, and human-machine interface products. Key features of the PIC16C55-HSE/SO include the 20 MHz 'HS' high-speed oscillator option (the -HSE/ suffix selects the high-speed crystal mode with the part rated for 16 MHz at 5 V), 25 bytes of RAM, 20 source-capable digital I/O pins, a watchdog timer, a 4-channel 8-bit analog-to-digital converter is NOT present on this baseline part (the PIC16C55 is digital-only - the 'C' suffix variant adds ADC), and an 8-bit timer/counter. The part runs from 2.5 V to 6.25 V, allowing it to operate directly from a 5 V regulated rail or from a 3-cell battery stack. The architecture is RISC-based with only 33 single-word/12-bit instructions, and the two-stage pipeline lets every instruction except branches execute in one cycle. The 25-byte general-purpose RAM is mirrored across all four banks of the data memory map (typical for the PIC16C5x baseline family), and I/O registers include the standard PORTA and PORTB latches, the TRIS direction registers, the OPTION register, and the TMR0 timer/counter. Brown-out detection is not present on the baseline 'C55' part but is available on the 'C55A' revision. Typical applications include legacy industrial control boards, simple appliance controllers, low-end consumer electronics, sensor front-ends, and educational/hobby designs where deterministic timing and code efficiency matter more than RAM or peripheral richness. The 28-SOIC package also makes it easy to hand-solder prototypes and rework production boards. The PIC16C55-HSE/SO is widely used as a drop-in upgrade for older PIC16C54 designs that need more I/O and instructions, and is supported by the MPLAB PM3 universal programmer plus all current MPLAB X IDE toolchains. When designing with this part, remember that OTP means the program memory cannot be erased - it is blank from the factory and must be programmed once at production. For prototyping, the PIC16C55/JW windowed ceramic version or the PIC16F55 Flash equivalent are recommended instead. Also note that the 'HSE' suffix selects the high-speed crystal oscillator mode; using a low-frequency crystal will halve the throughput and waste the part's capability. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the bare manufacturer datasheet.

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PIC16C55-HSE/SP

PIC16C55-HSE/SP - 8-Bit 16MHz OTP MCU 28-SPDIP | Microchip

The Microchip Technology PIC16C55-HSE/SP is an 8-bit OTP (One-Time-Programmable) CMOS microcontroller in the PIC16C5X baseline family, offering a 16 MHz maximum clock speed and 768 bytes (512 x 12) of program memory in a 28-pin SPDIP (Skinny Plastic DIP) through-hole package. It features 24 bytes of RAM, 20 programmable digital I/O pins, a 12-bit instruction word, and a 2-level hardware stack, with the /SP suffix indicating the SPDIP package and HSE denoting the high-speed 16 MHz oscillator variant. A PIC (Peripheral Interface Controller) microcontroller is a compact, low-cost embedded computing device built around a RISC (Reduced Instruction Set Computer) core, with program memory, data RAM, and peripherals integrated onto a single silicon die. Microcontrollers in the PIC16C5X baseline family sit within the hierarchy: MCU -> 8-bit microcontroller -> PIC16 baseline family -> PIC16C5X subgroup -> CMOS OTP -> industrial control IC. The baseline architecture is the original PIC core that launched Microchip's dominance in low-power embedded control, prized for deterministic execution, low quiescent current, and a tiny 33-instruction set that simplifies code generation in assembly or C. Key features of the PIC16C55-HSE/SP include a single 8-bit timer/counter (Timer0), a watchdog timer with on-chip RC oscillator for reliable brown-out recovery, power-saving sleep mode, and a wide operating voltage range of 2.5 V to 6.25 V. The HSE suffix specifies the oscillator range (high-speed, 16 MHz crystal/resonator), while the CMOS process enables low power consumption suitable for battery-backed and always-on applications. The baseline architecture executes one instruction per instruction cycle (4 clock cycles), giving a 100 ns minimum instruction time at 40 MHz-equivalent performance. Typical applications include low-cost industrial control loops, appliance control boards, sensor signal conditioning front-ends, automotive body and accessory controllers (in non-safety roles), and legacy embedded products where OTP one-time-programmability is acceptable. The 20 I/O pins can directly drive LEDs, keypads, and small relays, while internal pull-ups simplify matrix-scanned user interfaces. Designers should note that the PIC16C55 lacks in-circuit serial programming (ICSP), in-circuit debugging, and any analog peripherals (no ADC, no comparators), so it is best suited for digital glue logic and simple control tasks where high-pin-count analog or field-updatable firmware is not required. This page synthesizes real distributor stock and pricing, drop-in same-package alternatives from Microchip's own baseline PIC16C5X family, and practical design notes not found in the original manufacturer datasheet - giving procurement and firmware engineers a single source to evaluate, source, and design around the PIC16C55-HSE/SP. For long-life industrial designs, consider the flash-based PIC16F54 or PIC16F57 as a drop-in firmware-compatible upgrade path; for ultra-low power, the PIC16LF series offers lower VDD operation at the cost of oscillator frequency.

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PIC16C55-HSI/P

PIC16C55-HSI/P - 8-Bit 20MHz OTP MCU 768B | Microchip | PDIP-28

The Microchip Technology PIC16C55-HSI/P is an 8-bit CMOS RISC microcontroller in the PIC16C5x baseline family, offering 20 MHz maximum operating frequency, 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory, and 24 bytes of RAM, packaged in a 28-pin PDIP through-hole form factor. The "HS" oscillator designator denotes a High-Speed crystal/ceramic resonator mode, and the "I" suffix indicates the industrial temperature grade (-40C to +85C), while "/P" specifies the PDIP package. The device features 20 digital I/O pins, an 8-bit real-time clock/counter (TMR0), a two-level hardware stack, and direct/indirect/relative addressing modes for data and instructions. A baseline PIC microcontroller is a member of the simplest tier in Microchip's 8-bit PIC architecture family, optimized for cost-sensitive embedded control. Within the system hierarchy it sits below mid-range (PIC16) and enhanced mid-range (PIC16F1xxx) devices; baseline parts trade advanced peripherals for the lowest unit cost and the smallest instruction set (33 instructions, 12-bit wide). They are widely used in simple control loops, timers, and glue-logic replacement roles where computation demands are modest and pin-count is moderate. Key specifications of the PIC16C55-HSI/P include 20 MHz maximum clock (200 ns instruction cycle), 768 bytes of OTP program memory organized as 512 x 12 words, 24 bytes of general-purpose RAM, 20 I/O pins, a single 8-bit timer/counter (TMR0) with an 8-bit prescaler, and an operating voltage range suitable for 5V systems. The device also includes a watchdog timer (WDT), power-on reset (POR), and an industrial-grade temperature rating. Its 12-bit instruction word yields a 2:1 code compression advantage over many competing 8-bit architectures in the same price class, reducing program-memory consumption for typical control firmware. Architecturally, the PIC16C55-HSI/P uses a Harvard memory layout with separate program and data buses, enabling instruction fetch and operand access in a single cycle. The RISC-style instruction set comprises 33 fixed-width 12-bit opcodes, with all instructions executing in a single instruction cycle except branches (two cycles). This simplicity makes the part straightforward to program in assembly and provides deterministic real-time behavior, which is valuable in hard-real-time control applications. Typical applications include appliance controls, simple sensor interfaces, LED driving and lighting controllers, low-cost consumer electronics, battery chargers, and hobbyist/educational embedded projects. The 28-pin PDIP package is also favored for through-hole prototype boards and educational development kits where socketed parts simplify repeated programming cycles. When designing with this part, note that OTP memory can only be programmed once - prototype firmware must be validated on UV-erasable (JW) windowed variants or flash-based PIC16F5x equivalents before committing to OTP. A high-speed oscillator mode (HS) requires an external crystal or resonator in the 4 MHz to 20 MHz range, with proper PCB layout and load-capacitor selection to ensure stable startup. This page synthesizes distributor availability, drop-in alternatives from the PIC16C5x family, and design considerations not aggregated in the manufacturer datasheet alone - giving engineers a single reference for sourcing, replacement, and integration of the PIC16C55-HSI/P.

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PIC16C55-HSI/SO

PIC16C55-HSI/SO - 8-Bit 20MHz OTP MCU 768B | Microchip 28-SOIC

The Microchip PIC16C55-HSI/SO is an 8-bit CMOS microcontroller from Microchip's PIC16C5X family, featuring a 20 MHz maximum oscillator input, 768 bytes of EPROM-based program memory organized as 512 x 12 words, and 24 to 32 bytes of RAM (depending on family variant). It is housed in a 28-pin SOIC (SO, 7.50 mm width, 0.295 inch) surface-mount package. The device is a one-time-programmable (OTP) EPROM variant, designed for low-cost, high-performance, fully-static 8-bit embedded control. The "-HSI" suffix denotes a high-speed oscillator variant rated to 20 MHz with an industrial temperature grade. An 8-bit microcontroller (MCU) is a small computer-on-a-chip containing a CPU, RAM, ROM/EPROM/Flash program memory, I/O ports, and one or more timers on a single die. It belongs to the broader hierarchy: microcontroller -> embedded processor -> semiconductor -> integrated circuit. The PIC16C5X family uses a RISC-style Harvard architecture with separate program and data buses, a 12-bit-wide instruction word, and an 8-bit-wide data path, allowing single-cycle instruction execution on most instructions. This contrasts with 8051-family CISC designs that often need multiple cycles per opcode. Key differentiating specifications include a 12-bit instruction word (vs 14-bit on PIC16C6X/7X), a two-level hardware stack (vs 8-level on PIC16C6X), 20 I/O pins with high-current sink/source capability, an 8-bit real-time counter/timer (TMR0) with an 8-bit programmable prescaler, and direct/indirect/relative addressing modes for both data and instructions. The PIC16C55 family supports 33 single-word instructions with a 200 ns instruction cycle at 20 MHz oscillator input. Typical applications for the PIC16C55-HSI/SO include low-cost consumer appliances, automotive body controllers (non-AEC-Q), industrial timer/counter modules, simple sensor conditioning front-ends, remote-control transmitters, and replacement of discrete logic in glue-logic consolidation designs. The 28-SOIC package is suitable for hand-soldered prototypes and automated SMT lines where DIP packages would be too tall. When designing with the PIC16C55-HSI/SO, remember that OTP parts cannot be re-programmed in-circuit after the window-sealable ceramic package has been exposed to UV - the SOIC version has no erasure window, so code is committed at first programming. For development, use the JW (windowed CERDIP) variant of the same die for iterative code cycles. The device is no longer recommended for new designs (NRND) by Microchip; consider PIC16F54 or PIC16F57 flash-based parts as modern equivalents. This page synthesizes distributor pricing, drop-in alternatives within the same PIC16C55/PIC16C57 family, and practical design notes not aggregated on a single manufacturer page.

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PIC16C55-HSI/SS

PIC16C55-HSI/SS - 8-Bit 20MHz 768B OTP MCU 28-SSOP

The Microchip Technology PIC16C55-HSI/SS is an 8-bit EPROM/OTP-based CMOS microcontroller from the PIC16C5x family, delivering 20 MHz CPU performance with 768 bytes (512 x 12) of one-time-programmable program memory in a 28-pin SSOP package. The -HSI suffix denotes the high-speed 20 MHz internal oscillator option with industrial temperature range, while /SS indicates the SSOP-28 surface-mount package shipped in tube. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, ROM/EPROM, and peripherals into one package. The PIC16C5x family belongs to the broader PIC architecture hierarchy: 8-bit MCU -> RISC microcontroller -> Harvard architecture -> embedded controller -> semiconductor. These MCUs use a 12-bit wide instruction word with 8-bit data path, delivering 2:1 code compression over competitors in the same price tier. Key features include 20 MHz maximum clock, 768 bytes OTP program memory, 24 bytes of general-purpose RAM, 20 digital I/O pins, an 8-bit real-time clock/counter (TMR0), a hardware watchdog timer, and a two-level deep hardware stack. The device supports direct, indirect, and relative addressing modes. It runs from a single 4.5 V to 5.5 V supply and offers 12 I/O lines with high-current sink capability for direct LED driving. Architecturally, the PIC16C5x employs a fully static CMOS Harvard RISC core with 33 single-cycle instructions, deterministic interrupt response, and a dedicated hardware multiply-by-constant mechanism via RETLW/PCLATH. The 20 MHz oscillator option provides 200 ns instruction cycle and supports DC to 20 MHz operation across the full industrial temperature range of -40C to +85C. Typical applications include industrial control logic, automotive body electronics, appliance controllers, simple sensor interfaces, and battery-powered embedded subsystems. The 20 MHz speed and 20 I/O pins support mid-complexity sequencing tasks, while the 768-byte program memory suits compact state-machine and protocol-bridge firmware. When designing with the PIC16C55-HSI/SS, note that OTP memory is one-time programmable and cannot be field-upgraded; choose PIC16C55A flash-based variants for prototype iteration. Always use the MPLAB PM3 programmer or equivalent EPROM programmer with the correct adapter socket, and verify oscillator start-up time at minimum VDD with the crystal or ceramic resonator specified by Microchip. This page synthesizes distributor pricing, verified drop-in alternatives within the same PIC16C5x family, comparison parameters, and practical design notes that extend beyond the datasheet's pin description and electrical characteristics tables.

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PIC16C55-LP/P

PIC16C55-LP/P - 8-Bit 40MHz OTP MCU 768B | Microchip | DIP-28

The Microchip Technology PIC16C55-LP/P is an 8-bit CMOS ROM-based microcontroller from the PIC16C5X family operating at up to 40MHz, with 768 bytes of OTP program memory (512 x 12-bit words), 24 bytes of RAM, and a 12-bit instruction set housed in a 28-pin PDIP package. The "LP" suffix denotes a low-power oscillator variant with an operating frequency range up to 40MHz when using an external RC or crystal clock source, and the "/P" suffix denotes a 28-pin PDIP plastic through-hole package. An 8-bit microcontroller is a single-chip computer containing a CPU, program memory, data RAM, and programmable I/O peripherals on one die. Within the broader semiconductor taxonomy, the PIC16C55 belongs to the hierarchy: microcontroller -> embedded MCU -> 8-bit MCU -> CMOS RISC microcontroller -> semiconductor IC. The PIC16C5X family uses a Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access for higher throughput. Key features include 20 I/O pins, an 8-bit real-time clock/counter (TMR0) with an 8-bit prescaler, a watchdog timer (WDT) with its own on-chip RC oscillator for reliable operation, power-on reset (POR), and a two-level hardware stack. The OTP program memory allows one-time field programming via Microchip device programmers such as the MPLAB PM3, making the part suitable for prototype and low-volume production runs. The PIC16C55 employs an enhanced CMOS process with fully static design, meaning the clock can be stopped without losing internal register state - a feature useful for power-sensitive applications. Its RISC architecture with only 33 single-word instructions and mostly single-cycle execution provides deterministic timing suitable for real-time control. The 12-bit instruction word delivers approximately 2:1 code compression over competing 8-bit architectures. Typical applications include appliance control, automotive body electronics, industrial control logic, sensor signal conditioning, low-cost consumer products, and legacy embedded systems. The wide operating temperature range and OTP memory make it well-suited to cost-sensitive, fixed-function embedded products. When designing with this part, consider that OTP memory cannot be reprogrammed, so code must be fully validated before committing to production. For new designs, Microchip recommends flash-based PIC16F successors such as the PIC16F54 for drop-in compatibility and re-programmability. This page consolidates distributor pricing, drop-in alternatives, parametric comparisons and practical design notes to help engineers rapidly evaluate the PIC16C55-LP/P for both new designs and legacy maintenance scenarios.

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PIC16C55-LP/SS

PIC16C55-LP/SS - 8-Bit OTP MCU, 768B, 40kHz, SSOP-28 | Microchip

The Microchip Technology PIC16C55-LP/SS is a low-cost, high-performance, fully-static 8-bit CMOS microcontroller from the PIC16C5X family, packaged in a 28-pin SSOP and supplied in tube form. It integrates 768 bytes of one-time-programmable (OTP) program memory, 25 bytes of RAM, and a RISC CPU core executing 35 single-word instructions per cycle at a maximum clock rate of 40 kHz in the LP (Low-Power) variant. Operating voltage spans 3.0 V to 6.25 V, making it compatible with both 3.3 V and 5 V rails. A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory, and peripheral I/O on one die. The PIC16C5X family belongs to the broader taxonomy: microcontroller -> embedded processor -> semiconductor device. RISC (Reduced Instruction Set Computer) MCUs use a small, fixed-length instruction set to simplify decoding, enabling deterministic instruction timing useful in real-time control loops. Key features include 12 I/O pins, an 8-bit timer/counter with 8-bit prescaler, a watchdog timer with its own on-chip RC oscillator for reliable reset, and a power-on reset circuit. Code protection prevents unauthorized read-back of OTP contents. The architecture is Harvard-style, with separate program and data buses, and supports two hardware stack levels. Brown-out detection is not included on this original PIC16C5X silicon. The EPROM-based (OTP) design lets customers commit firmware at production time without NRE mask charges, lowering prototyping cost for low-to-mid volume runs. The LP oscillator mode is optimized for 32.768 kHz watch-crystal operation, making the device especially attractive for battery-powered metering and clock-reference designs where microampere sleep currents matter more than throughput. Typical applications include low-speed sensor signal conditioning, battery chargers, appliance timers, security keypads, and simple closed-loop fan or heater controllers. Because the 40 kHz ceiling limits computation, this part is best reserved for bit-banged interfaces and time-deterministic control, not high-bandwidth comms. When designing with this device, select a 32.768 kHz crystal with load capacitance matched to the internal oscillator configuration bits, and provision a low-ESR bypass capacitor of at least 0.1 uF within 5 mm of VDD. Note that the PIC16C55 is OTP-only; for in-field firmware upgrades consider the PIC16F or PIC16Cxxx Flash/EPROM successors. This page synthesizes 2026 distributor pricing from DigiKey/Mouser/Octopart, pin-compatible Microchip drop-in alternatives, application circuit guidance, and selection trade-offs that the manufacturer datasheet does not aggregate.

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PIC16C55-LPE/SO

PIC16C55-LPE/SO - 8-Bit 40MHz OTP MCU 512x12 SOIC-28 | Microchip

The Microchip Technology PIC16C55-LPE/SO is an 8-bit RISC PIC microcontroller operating at 40 MHz, integrating 768 bytes (512 x 12-bit) of One-Time-Programmable (OTP) program memory and 24 bytes of RAM in a 28-pin SOIC package. The "LP" speed grade designates a low-power CMOS oscillator variant operating up to 40 MHz at 5V, with reduced oscillator speed options down to 200 kHz at lower Vdd. The "E" suffix indicates the extended industrial temperature range of -40C to +125C. An 8-bit PIC microcontroller is a class of reduced-instruction-set computing (RISC) device built around a Harvard architecture that separates program and data memory buses. Within the broader taxonomy, the PIC16C55 belongs to the PIC microcontrollers -> 8-bit microcontrollers -> microcontrollers -> microcontrollers (MCUs) -> embedded processors -> semiconductor devices hierarchy. This category of MCUs is used in applications where deterministic instruction execution, low cost, and ease of development outweigh the need for higher computational throughput. Key features include 33 single-word instructions, a 12-bit instruction word for 2:1 code compression versus competing 8-bit MCUs, 20 I/O pins, two 8-bit timers/counters, a watchdog timer with its own on-chip RC oscillator, and power-saving SLEEP mode. The device operates from 2.5V to 6.0V across the extended temperature range. The 28-SOIC package provides 7.5 mm creepage and is suitable for both hand-soldered prototypes and high-volume surface-mount production. The PIC16C55 architecture uses a two-stage pipeline with a 12-bit program counter and 8-bit data path, executing one instruction per instruction cycle (four oscillator clocks). This contrasts with the four-cycle-per-instruction architectures common in older 8051-class MCUs. The integrated watchdog timer and power-on reset reduce external component count, while the on-chip oscillator eliminates the need for an external crystal in RC-oscillator configurations. Typical applications include appliance control, automotive subsystems, industrial sensors, low-end consumer electronics, and battery-powered instruments. Because the PIC16C55 is OTP, it is intended for production-volume runs rather than prototyping; engineers typically develop code on a Flash-based PIC16F equivalent and port it to the PIC16C55 for cost-optimized production. When designing with this part, select the appropriate oscillator mode (RC, LP, XT, HS) for the desired frequency and stability, and reserve pins GP0/GP1 or other suitable I/Os for in-circuit serial programming during factory production. Note that PIC16C55 is a mature/legacy part and Microchip now recommends the PIC16F54 or PIC16C505 as modern alternatives for new designs.

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PIC16C55-LPE/SP

PIC16C55-LPE/SP - 8-Bit 40MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55-LPE/SP is an 8-bit RISC microcontroller from the legacy PIC16C5x family, featuring 768 bytes of One-Time Programmable (OTP) program memory organized as 512 x 12-bit words, 24 bytes of general-purpose RAM, and up to 20 digital I/O pins. It executes instructions from a Harvard-architecture RISC core at clock rates up to 40 MHz (with the LP suffix indicating the low-power 32 kHz to 40 MHz oscillator range), housed in a 28-pin SPDIP (Skinny Plastic DIP) package. The PIC16C5x family occupies a distinct place in microcontroller taxonomy: it is the original baseline PIC architecture, sitting beneath mid-range (PIC16F1xxx) and enhanced mid-range (PIC16F1xx) families in the broader 8-bit microcontroller hierarchy, which itself falls under microcontroller -> embedded processing -> semiconductor. Baseline PIC devices use a fixed 12-bit instruction word, separate program and data buses (Harvard), and a register-based accumulator architecture, which together deliver compact code density and predictable interrupt response. Key features of the PIC16C55-LPE/SP include a 33-instruction set, two 8-bit timer/counters (TMR0 and TMR1 in the watchdog role), a watchdog timer with on-chip RC oscillator, programmable code protection, and a wide 3.0V to 6.0V operating voltage range compatible with both 3.3V and 5V system rails. The LP oscillator option supports low-power crystal operation, making the part appropriate for energy-conscious designs. The device offers 20 I/O pins with high-current sink capability directly driving LEDs and small relays. Typical applications include simple embedded control loops, sensor signal conditioning front-ends, consumer appliance controllers, and educational/development platforms. Its low cost, deterministic execution, and OTP memory make it well suited to high-volume, fixed-function products where firmware changes are not anticipated after programming. The PIC16C55-LPE/SP also serves as a teaching vehicle for engineers learning PIC assembly language fundamentals. When designing with the PIC16C55-LPE/SP, engineers should note that OTP memory cannot be reprogrammed in-circuit; once programmed, firmware changes require a new device. The PIC16C55 is an older, mature part with limited availability from authorized distributors. The device requires an external reset circuit and does not include on-chip debug; development typically relies on the MPLAB PM3 programmer and MPLAB IDE for code generation. This page synthesizes distributor pricing, package details, and drop-in pin-compatible alternatives to assist engineers sourcing this legacy MCU.

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PIC16C55-LPE/SS

PIC16C55-LPE/SS - 8-Bit 40MHz OTP MCU 28-SSOP | Microchip

The Microchip Technology PIC16C55-LPE/SS is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 768 bytes of One-Time-Programmable (OTP) program memory (organized as 512 x 12-bit words), 24 bytes of RAM, and a maximum clock speed of 40 MHz, all housed in a 28-pin SSOP package. The part suffix -LPE indicates the low-power extended temperature variant, qualified to the automotive temperature grade, which makes it suitable for harsh-environment deployments where commercial-grade parts would otherwise fail. What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller contains non-volatile program memory that can be written exactly once by the user or by a device programmer before being deployed in the field. Unlike Flash-based MCUs that allow thousands of erase/write cycles, OTP parts are permanently locked after the first programming cycle, which yields lower per-unit cost and a smaller silicon die. The PIC16C5X family uses a 12-bit wide instruction set with a RISC-style architecture that achieves 2:1 code compression over other 8-bit microcontrollers in its class, allowing more functionality in fewer instruction words. Key features of the PIC16C55-LPE/SS include a 33-instruction set, DC to 40 MHz operation, an internal watchdog timer, power-on reset, on-chip oscillator options, and up to 20 I/O pins depending on package variant. The 28-SSOP (Shrink Small Outline Package) provides a compact 5.30 mm body width with gull-wing leads suitable for high-density surface-mount assemblies. Per Microchip's product page, the PIC16C55 family supports programming via the MPLAB PM3 Universal Device Programmer. The device architecture is a Harvard-style RISC core with separate program and data buses, enabling simultaneous instruction fetch and data access. This dual-bus structure, combined with single-cycle instruction execution except for branch instructions, gives deterministic timing that simplifies real-time control loops. The 8-bit wide ALU and 12-bit instructions reflect the cost-optimized design philosophy of the PIC16C5X generation. Typical applications include automotive body controllers, low-cost sensor interfaces, LED driver controllers, simple appliance controls, and replacement of discrete logic in cost-sensitive embedded designs. The extended automotive temperature grade (-40C to +85C or wider) makes it especially well-suited to under-hood and cabin-mounted automotive ECUs. When designing with this device, note that OTP memory cannot be reprogrammed in-circuit, so firmware must be fully validated and burned into the part before deployment. Use the MPLAB PM3 or compatible programmer, and ensure the in-circuit programming pins (RB6, RB7) are accessible on the PCB if any post-production recovery is desired. The automotive temperature grade typically supports -40C to +125C operation, but always verify against the specific Microchip datasheet thermal specification. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes drawn from the manufacturer datasheet and distributor records to provide engineering value beyond what is found in the bare datasheet PDF.

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PIC16C55-LPI/SO

PIC16C55-LPI/SO - 8-bit OTP MCU, 40MHz, 768B | Microchip

The Microchip Technology PIC16C55-LPI/SO is an 8-bit RISC CMOS microcontroller from the foundational PIC16C5x family, offering 768 bytes (512 × 12) of one-time-programmable (OTP) program memory, 24 bytes of RAM, and 20 bidirectional I/O lines in a 28-pin SOIC package. The PIC16C5x family is the original baseline architecture that established the PIC microcontroller lineage; baseline PIC MCUs use 12-bit-wide instructions and an 8-bit-wide data path, delivering roughly twice the code density of competing 8-bit controllers. They feature a two-level deep hardware stack, a single 8-bit real-time counter (TMR0), and direct, indirect, and relative addressing modes for both instructions and data. Compared with modern enhanced mid-range PIC16 or PIC18 devices, the PIC16C55 lacks interrupts and peripherals such as ADC, UART, and PWM, making it suitable for simple glue-logic replacement and cost-sensitive embedded control. Key features include 768B of OTP program memory, 24B of RAM, 20 I/O pins, an 8-bit timer/counter, a wide 2.5V to 6.25V operating range, and an industrial temperature grade (-40 °C to +85 °C). The device supports a maximum clock frequency of 40 MHz at 5V operation, and is engineered around a Harvard architecture and RISC instruction set, producing deterministic execution and a single-instruction-cycle throughput on most opcodes. The 28-SOIC package (7.50 mm / 0.295 in body) is industry-standard for SMD assembly. Typical applications include low-cost consumer appliance controllers, LED drivers, simple sensor readers, and legacy industrial-control board retrofits where the original PIC16C5x code base is preserved. Because the part is OTP, it is intended for high-volume production where field re-programmability is not required; for engineering prototypes or low-volume production, a Flash-based PIC16F equivalent in the same family is usually a more practical choice. The 'LPI' suffix indicates a low-power industrial temperature grade, and '/SO' specifies the 28-SOIC surface-mount package. Engineers targeting drop-in PCB reuse should confirm the pinout against the Microchip 28-pin PICmicro pin/code compatibility chart before substituting a different PIC16 family variant.

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PIC16C55-LPI/SS

PIC16C55-LPI/SS - 768B OTP 8-bit MCU, 20 I/O, SSOP-28 | Microchip

The Microchip Technology PIC16C55-LPI/SS is a member of the PIC16C5X family of low-cost, high-performance 8-bit fully static CMOS microcontrollers built around a RISC instruction set, offered in a 28-pin SSOP (0.209-inch / 5.30 mm width) package with One-Time-Programmable (OTP) program memory. The device integrates 512 x 12 words of OTP program memory, 24 bytes of data RAM, and 20 digital I/O pins organized around an 8-bit data path with 12-bit-wide instructions, achieving roughly 2:1 code compression versus competitive 8-bit controllers in its class. Per the PIC16C55 datasheet, the core executes most instructions in a single 200 ns instruction cycle at 20 MHz (4 MHz oscillator input with on-chip 4x PLL equivalent timing), giving an effective throughput of 5 MIPS in this LP (low-power) speed grade. What is an 8-bit OTP microcontroller? An 8-bit OTP MCU is a small RISC processor with an 8-bit ALU and 8-bit data bus, packaged with non-volatile program memory that can be written exactly once during production programming - making it a cost-optimized alternative to UV-erasable EPROM MCUs and a more secure option than Flash for low-to-medium volume products. Within the embedded hierarchy, the PIC16C5X sits below PIC16 enhanced cores and PIC18, targeting cost-sensitive applications that need deterministic timing and a tiny footprint rather than large code space. The PIC16C55-LPI variant is specified for the LP oscillator range (typically 200 kHz to 4 MHz crystal) with industrial-grade -40C to +85C operation and low-power quiescent characteristics, distinguishing it from the XT, HS, and RC variants in the same family. Hardware features include an 8-bit real-time clock/counter (TMR0) with programmable prescaler, a two-level deep hardware stack, direct/indirect/relative addressing modes, seven or eight special-function hardware registers, a watchdog timer, power-on reset, and brown-out / power-on reset circuitry. The SSOP-28 footprint and pinout allow direct substitution with other PIC16C5X 28-pin SSOP variants. Typical applications include low-cost consumer appliances, white-goods user-interface boards, simple sensor front-ends, automotive body controllers, industrial timers and counters, and battery-powered metering nodes. The combination of 20 I/O lines, 768-byte OTP, and a sub-2 mA active current makes it suitable for cost-sensitive designs where the PIC ecosystem (MPLAB IDE, MPASM assembler, MPLAB PM3 programmer) is preferred over more complex ARM Cortex-M parts. A key design consideration is OTP memory programming: code must be committed at the production line using a Microchip device programmer (e.g., MPLAB PM3) because OTP cannot be erased in-circuit; engineers should plan for firmware-revision discipline and use the JW UV-erasable variant during development. For new designs, Microchip generally recommends Flash-based successors such as PIC16F54 in the same package. This page synthesizes distributor pricing, drop-in PIC16C5X SSOP-28 alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C55-RCE/P

PIC16C55-RCE/P - 8-Bit 4MHz OTP MCU 768B | 28-PDIP

The Microchip Technology PIC16C55-RCE/P is an 8-bit PIC microcontroller from the PIC® 16C family, featuring a 4 MHz maximum clock speed, 768 bytes of OTP program memory organized as 512 words × 12 bits, and 24 bytes of data RAM. It is housed in a 28-pin Plastic DIP (PDIP-28, 0.600 inch / 15.24 mm) through-hole package, making it suitable for legacy designs, educational kits, and industrial control applications where through-hole assembly remains preferred. The device operates from a single 5 V supply typical of the PIC16C5X baseline family. An 8-bit OTP microcontroller is a single-chip computer built around an 8-bit data path and a one-time-programmable non-volatile memory array, intended for embedded control where code is finalized at production time and rarely, if ever, changed. In the broader taxonomy, the PIC16C55 sits within the PIC16C5X baseline series, which belongs to the PIC16 family, which belongs to the 8-bit PIC microcontroller family, which sits under the larger microcontroller (MCU) product hierarchy of Microchip's semiconductor portfolio. The baseline architecture uses 12-bit wide instructions delivering 2:1 code compression versus competing 8-bit MCUs in the same price class. Key features of the PIC16C55-RCE/P include: a Harvard architecture with separate program and data buses, 12-bit instruction word, 33 single-word instructions, two 8-bit I/O ports (PORTA and PORTB), one 8-bit timer/counter (TMR0), a watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and in-circuit serial programming support. The device also offers DC to 4 MHz clock input, 2.0 V to 6.25 V (V) supply range (extended industrial variants), and CMOS low-power technology with typical < 2 mA operating current at 5 V / 4 MHz. From an architecture standpoint, the PIC16C55 uses a RISC-like instruction set with fixed instruction length, enabling predictable interrupt latency and deterministic execution. The 12-bit instruction width packs opcode, operand, and destination bits together; this is a hallmark of the PIC16C5X baseline series and explains the 2:1 code compression advantage. The processor employs a two-stage pipeline so most instructions complete in one cycle, providing approximately 1 MIPS throughput at 4 MHz. This simplicity is a deliberate engineering trade-off: fewer peripherals and less RAM, but very fast context switches and a small die, which is why baseline PICs remain a cost-effective choice in volume. Typical applications include simple timing and sequencing controllers, low-end motor control signal generators, appliance controls, security panels, lighting controllers, sensor signal processors, remote transmitter encoders, and educational microcontroller training platforms. The PIC16C55-RCE/P is particularly well-suited to high-volume cost-sensitive products where program code is finalized before deployment and through-hole PCB assembly is acceptable. When designing with the PIC16C55-RCE/P, ensure your programmer supports OTP devices (such as the Microchip MPLAB PM3) and that the firmware is verified before committing to production, since OTP memory cannot be erased. For new designs, consider the flash-based PIC16F54 or PIC16F57 as modern, electrically erasable drop-in upgrades within the same family footprint. This page synthesizes verified distributor pricing, drop-in PIC16C5X family alternatives, design considerations for OTP programming, and comparison data against flash-based successors not found in the manufacturer datasheet alone.

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PIC16C55-RCE/SO

PIC16C55-RCE/SO - 8-Bit 4MHz OTP MCU 768B 28-SOIC | Microchip

The Microchip Technology PIC16C55-RCE/SO is a member of the original PIC16C5x family, an 8-bit RISC-based CMOS microcontroller built around a Harvard architecture with 12-bit wide instructions. It integrates 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, 24 bytes of general-purpose RAM, and 20 digital I/O pins, all in a 28-pin narrow-body SOIC (SO) package. Operating from 3.0V to 6.0V supply at up to 4 MHz, the part is offered in the commercial/extended temperature grade. An OTP microcontroller is a variant of EPROM-based MCU where the program memory can be written exactly once at programming time, after which it behaves like masked-ROM silicon. Compared with flash-based MCUs, OTP parts offer lower per-unit cost at high volume, smaller silicon area, and stronger data retention because there is no charge pump or Fowler-Nordheim tunnel oxide to age. These advantages made the PIC16C5x family ubiquitous in late-1990s and early-2000s appliance, sensor, and consumer products where code stability was final on first programming. The PIC16C55-RCE/SO executes most instructions in a single 250 ns cycle (4 MHz / 4) thanks to a 4-clock-per-instruction core, yielding roughly 4 MIPS peak throughput. The 33-instruction RISC set is highly orthogonal, the 8-level deep hardware stack simplifies interrupt-free subroutines, and the 12-bit instruction width yields a typical 2:1 code density advantage over competing 8-bit CISC MCUs. Two hardware timers (8-bit RTCC + WDT), a Power-On Reset (POR), and brown-out protection are integrated. There is no on-chip ADC, UART, or I2C peripheral; the device is intended as a glue controller in simple digital subsystems. The 28-pin SOIC footprint matches the PIC16C55A and PIC16C55A-EP successors that offer expanded RAM (72 B vs 24 B) and higher oscillator options, allowing PCB-level drop-in migration. Pin 1 (RA2), pin 20 (Vss) and pin 28 (VDD) keep the same port assignments, and the external RC/HS/LP/XT oscillator pins (OSC1 / OSC2 / CLKOUT / CLKIN) remain fixed across the family, easing engineering change orders. Typical applications include washing-machine user-interface boards, dishwasher cycle controllers, microwave oven keypads, hobby servomotor drivers, low-end thermostat logic, fan and pump speed controllers, and PC peripheral front panels. Designers also use it as a supervisor companion next to a host processor - the 20 mA sink/source capability on every I/O pin is sufficient to drive relays through a discrete transistor. A key design consideration: OTP cannot be re-programmed in-circuit. Provision a stable prototype path using a windowed JW or a flash sibling (PIC16F54 in SOIC-28) for firmware iteration, then move to the OTP -RCE/SO for production. The /RC oscillator option (suffix 'RC') allows an external resistor/capacitor timing network and eliminates the cost of a crystal in cost-sensitive designs. This page synthesizes distributor pricing, parametric comparisons against active family members, and practical design notes (oscillator trade-offs, OTP programming flow, migration path to PIC16C55A and PIC16F54) not aggregated in the manufacturer datasheet alone.

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PIC16C55-RCE/SS

PIC16C55-RCE/SS - 8-Bit 4MHz OTP MCU 768B 28-SSOP | Microchip

The Microchip Technology PIC16C55-RCE/SS is an 8-bit PIC® 16C-series microcontroller built around the classic Harvard RISC core, operating at a 4 MHz clock speed and packaged in a 28-pin SSOP (5.30 mm body width, 0.65 mm pitch). It integrates 768 bytes of OTP (One-Time Programmable) program memory organized as 512 × 12 bits and 24 bytes of RAM, with 20 general-purpose digital I/O pins, an on-chip Power-On Reset (POR) and Watchdog Timer (WDT). The /SS suffix identifies the SSOP surface-mount variant. An 8-bit OTP microcontroller is a single-chip computer that executes a fixed program burned into non-erasable program memory at the factory. In the broader taxonomy, the PIC16C55 belongs to: microcontroller (MCU) → 8-bit MCU → RISC MCU → PIC16 family → OTP-programmed mid-range MCU → embedded controller. Unlike flash-based MCUs the OTP variant is intended for cost-sensitive, volume production runs where firmware will not be updated in the field, which makes it common in appliance control, automotive subsystems, and disposable/embedded industrial nodes. Key features include 33 single-word instructions, a 12-bit instruction word, two 8-bit I/O ports (Port A and Port B/C depending on revision), a 4 MHz internal-external clock domain, and a programmable WDT for unattended operation. The wide 3.0 V to 6.0 V supply range (typical 5 V) and 4 MHz fOSC let the device target low-power and battery-tolerant designs. Architecturally, the PIC16C55 uses a 14-bit instruction word decoded from a 12-bit program word, separate program and data buses, a small instruction pipeline, and direct register-mapped I/O rather than memory-mapped peripherals. This makes for deterministic cycle timing and very small interrupt latency, which is why PIC16C-series parts have remained popular for hard-real-time control loops. Typical applications include appliance controllers (washing machines, microwave ovens), automotive lighting/relay drivers, HVAC fan and pump controllers, low-end security keypads, simple sensor interface boards, and remote/IR transmitter logic. Engineers also use the PIC16C55 in legacy industrial controls where the OTP-only, no-debug interface is preferred for IP protection. When designing with this part, plan the OTP programming step into the production flow: parts cannot be reprogrammed in-circuit, so a programming adapter (e.g. SSOP-28 to DIP-28) is typically used for batch programming. The lack of in-circuit debug means bench prototypes are usually developed on a flash-equivalent PIC16F5x and ported to PIC16C55 for production. This page synthesizes distributor pricing, drop-in OTP and flash alternatives, programming-adapter guidance, and practical design notes not consolidated in a single place on the manufacturer datasheet.

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PIC16C55-RCI/P

PIC16C55-RCI/P - 8-bit CMOS MCU 0.75KB ROM 20 I/O | Microchip

The Microchip Technology PIC16C55-RCI/P is a ROM-based 8-bit CMOS microcontroller in the PIC16C5X mid-range family, featuring 0.75 KB of program memory, 24 bytes of RAM, and 20 digital I/O pins housed in a 28-pin PDIP (P) through-hole package. It is specified for the RC oscillator mode (R) at commercial (C) temperature range and ships as an industrial-grade (I) variant, balancing legacy compatibility with extended-temperature operation. A PIC microcontroller is a compact, self-contained computer-on-a-chip that integrates a CPU, non-volatile program memory, working RAM, digital I/O, and one or more timers onto a single die. The PIC16C5X family uses a 12-bit-wide instruction word and an 8-bit data path, achieving roughly 2:1 code compression versus typical 8-bit CISC microcontrollers. Within the broader taxonomy, this part belongs to microcontrollers -> 8-bit MCUs -> embedded controllers -> semiconductors, and serves as a predecessor to the modern flash-based PIC16F family. Key features include an 8-bit real-time clock/counter (TMR0), a two-level hardware stack, direct/indirect/relative addressing, seven or eight special-function hardware registers, and a programmable code-protection bit. The device operates from a wide 2.5 V to 6.25 V supply, supports clock speeds up to 20 MHz (4 MHz RC variant), and offers power-saving Sleep mode with Wake-on-pin-change. The 28-pin PDIP footprint delivers 20 usable I/O lines after reserving VDD, VSS, OSC1, OSC2, MCLR, and the timer-0 pin. The architecture is based on a RISC-style Harvard design with separate program and data buses, enabling simultaneous instruction fetch and operand access. Instruction pipelining overlaps fetch and execute cycles, so most instructions complete in one oscillator cycle except for program branches. The RC oscillator option eliminates the cost of an external crystal or resonator, reducing BOM cost for cost-sensitive appliance, toy, and consumer-electronics designs. Typical applications include appliance controllers, HVAC fan and damper drivers, automotive body-electronics modules, simple sensor signal conditioning, RC servo drivers, and legacy industrial control boards. The wide operating voltage range and industrial temperature grade make it suitable for environments where regulated power and stable thermal behavior are required. When designing with this device, plan for its 2-level stack - deeply nested subroutines will overflow the hardware stack, so engineers typically keep call depth shallow or convert to iterative code. For modern designs, consider migration to the flash-based PIC16F54 or PIC16F57, which offer the same 18-20 I/O count and 28-pin PDIP footprint but provide reprogrammability. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C55-RCI/SO

PIC16C55-RCI/SO - 8-bit OTP MCU, 768B, 20 I/O, SOIC-28 | Microchip

The Microchip Technology PIC16C55-RCI/SO is an 8-bit EPROM/OTP-based CMOS microcontroller in the PIC16C5X family, supplied in a 28-pin SOIC (0.295", 7.50 mm width) package. The -RC suffix denotes an industrial-temperature grade part with an RC-oscillator compatible clock architecture, while the /SO suffix indicates the wide-body 28-SOIC surface-mount package. What is a PIC16C5X microcontroller? The PIC16C5X is Microchip's original low-cost, high-performance 8-bit fully-static RISC microcontroller family based on EPROM/OTP (one-time programmable) non-volatile memory. It uses 12-bit-wide instructions with an 8-bit data path, two-level-deep hardware stack, and direct/indirect/relative addressing modes. PIC16C5X devices sit at the foundation of the PIC16 architecture hierarchy (PIC16C5X -> PIC16CXXX -> PIC16FXXX), which has grown into the industry's broadest 8-bit microcontroller portfolio. Key features of the PIC16C55 include 768 bytes of EPROM program memory (per the Microchip parametric listing), 24 bytes of RAM, 20 digital I/O pins, one 8-bit real-time counter (TMR0), and 12-bit instruction words. The device supports operating voltages from 3.0 V to 6.25 V (parametric) and industrial temperature range -40 °C to +85 °C. Clock rates up to 20 MHz are achievable when paired with external crystal or RC oscillator components; internal RC-oscillator compatibility enables low-BOM-count designs. Architecturally, the PIC16C55 uses a single accumulator (W register) RISC engine with 33 single-word instructions. The two-level hardware stack limits nested subroutines but is sufficient for the small control loops typical of embedded appliances. The 8-bit TMR0 with programmable prescaler provides the timing/event foundation for the device; combined with 20 I/O pins, this makes the PIC16C55 well-suited for simple control, sensing, and timing tasks. Typical applications include low-cost consumer appliances, white goods, toys, remote controls, sensor signal-conditioning front-ends, simple LED/keypad interface controllers, and industrial control modules where OTP memory and small footprint are acceptable. Engineers designing modern boards frequently migrate designs to PIC16F5X flash-based parts but retain the PIC16C55-RCI/SO pinout to reuse proven PCB layouts. Design consideration: OTP EPROM cannot be reprogrammed; verify firmware with windowed or JW-package samples before committing to OTP production units. When migrating to flash, note that PIC16F55 derivatives are not always drop-in compatible — confirm pinout and SFR mapping against the Microchip compatibility chart before PCB rework. This page consolidates distributor pricing, cross-reference alternatives drawn from the Microchip PIC16C5X family, and practical design notes not found in the standalone datasheet PDF.

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PIC16C55-XT/P

PIC16C55-XT/P - 8-bit 4MHz OTP MCU 20 I/O 28-PDIP | Microchip

The Microchip PIC16C55-XT/P is an 8-bit RISC microcontroller from the PIC16C5X family, operating at up to 4 MHz with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory and 24 bytes of RAM, housed in a 28-pin PDIP package. It features 20 digital I/O lines, a single 8-bit timer/counter (TMR0), and a two-level deep hardware stack, making it one of the earliest members of Microchip's PIC baseline architecture. A baseline PIC microcontroller (also written PICmicro) is an 8-bit fully-static, EPROM/ROM-based CMOS MCU family defined by a RISC instruction set with 12-bit-wide instructions and 8-bit-wide data paths. The PIC16C5X line sits at the bottom of Microchip's PIC hierarchy: baseline PIC16C5X -> mid-range PIC16 -> enhanced mid-range PIC16 -> PIC18 -> PIC24 -> dsPIC -> 32-bit PIC32. Baseline PICs use a small instruction set, a single 8-bit accumulator (W), and a limited two-level stack, optimized for cost-sensitive embedded control rather than compute throughput. Key features of the PIC16C55-XT/P include 33 single-word instructions, two-level hardware stack, direct/indirect/relative addressing modes, power-on reset, power-saving SLEEP mode, watchdog timer with dedicated on-chip RC oscillator, and programmable code protection. The XT speed grade specifies an external crystal/resonator oscillator range of approximately 100 kHz to 4 MHz, and the device operates from 3.0V to 6.0V (per the family datasheet; 4.5-5.5V typical for full-speed operation). Architecturally, the PIC16C55 uses a Harvard-class memory layout with separate program and data buses, a single working register (W), seven or eight Special Function Registers, and a 7-bit file register map. The 12-bit instruction word yields roughly a 2:1 code compression advantage over comparable CISC 8-bit controllers. There is no hardware multiplier, no interrupt controller, and no in-circuit debugger (ICD) — the baseline family trades features for die size and unit cost. Typical applications include low-cost consumer appliances, sensor signal conditioning, simple motor/relay control, automotive body controllers, and educational/hobbyist designs that target the classic PIC16C5X pinout. The 28-pin PDIP footprint also enables easy breadboard prototyping and windowed CERDIP emulation variants (such as PIC16C55-JW). When designing with this part, allocate one I/O pin for MCLR reset, choose the appropriate oscillator mode (XT for standard crystals), and verify the OTP programming procedure against the Microchip programming specification, because OTP parts cannot be reprogrammed or erased after coding. This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not aggregated on any single distributor or manufacturer page.

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PIC16C55-XT/SO

PIC16C55-XT/SO - 8-Bit 4MHz OTP MCU 20 I/O | Microchip | SOIC-28

The Microchip Technology PIC16C55-XT/SO is an 8-bit CMOS OTP-based microcontroller from the PIC16C5X family, delivering 4 MHz of CPU performance with 768 bytes of program memory (organized as 512 x 12 words), 24 bytes of RAM, and 20 digital I/O pins, all packaged in a 28-pin SOIC (SO) surface-mount form factor. The "XT" suffix denotes a 4 MHz crystal/resonator oscillator option with internal oscillator calibration, and the "SO" suffix denotes the 7.5 mm body-width 28-lead Small-Outline IC package. What is an 8-bit microcontroller? An 8-bit microcontroller is a single-chip computer that uses an 8-bit-wide data path and executes instructions drawn from on-chip program memory, exposing digital and sometimes analog peripherals for embedded control tasks. The PIC16C5X family sits at the low end of the 8-bit MCU hierarchy - below 16-bit and 32-bit controllers - and is positioned within the broader category of microcontrollers (MCU), embedded processors, and finally integrated circuits. This class of device is optimized for cost-sensitive, deterministic, low-power control applications where 32-bit processing power would be wasted. The PIC16C55-XT/SO features a 12-bit-wide instruction word with an 8-bit-wide data path, two levels of hardware stack, seven or eight special-function hardware registers, direct/indirect/relative addressing modes, and an 8-bit real-time clock/counter (TMR0). Program memory is one-time programmable (OTP) EPROM, which means each device can be programmed only once - making the part ideal for high-volume production runs where reprogramming is unnecessary. The 20 I/O pins each source or sink up to 25 mA, sufficient to drive LEDs, relays, and small solenoids directly without buffering. Typical applications span white goods and appliance controls, simple sensor interfaces, LED display drivers, automotive interior modules (where conditions allow), low-end remote controls, and battery-powered instruments. The device is supported by Microchip's MPLAB development ecosystem, including the MPLAB PM3 universal device programmer for production programming and the original PIC16C5X assembly language toolchain. When designing with the PIC16C55-XT/SO, account for the OTP memory constraint by planning firmware revisions carefully and keeping engineering samples for development. Ensure the XT oscillator's crystal or resonator load capacitors match the manufacturer's specifications, and budget for the 4 MHz instruction-cycle timing margin in real-time control loops. This page synthesizes distributor pricing, OTP-MCU drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C55-XT/SS

PIC16C55-XT/SS - 8-bit OTP MCU, 768B, 4MHz, 28-SSOP | Microchip

The Microchip Technology PIC16C55-XT/SS is an 8-bit CMOS EPROM/OTP-based microcontroller delivering 4 MIPS performance at 4 MHz from a 28-pin SSOP package. It integrates 768 bytes of One-Time-Programmable (OTP) program memory organized as 512 x 12 words and 24 bytes of general-purpose RAM, providing 20 digital I/O pins organized across five ports for embedded control applications. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, program memory, and I/O peripherals on one die. The PIC16C5X family from Microchip Technology belongs to the baseline 8-bit RISC MCU category, which sits within the broader taxonomy of microcontroller -> embedded processor -> semiconductor IC. These devices are designed for cost-sensitive, deterministic real-time control tasks where predictable instruction timing, low power consumption, and small package footprint matter more than raw compute throughput. Key features include a two-level deep hardware stack, 12-bit-wide instruction words with 2:1 code compression versus typical 8-bit CISC architectures, direct/indirect/relative addressing modes, and an 8-bit real-time clock/counter (TMR0). The XT oscillator suffix specifies a standard crystal/resonator frequency range, and the SSOP suffix designates the 0.209-inch (5.30 mm) wide Shrink Small Outline Package. Wide operating voltage and industrial temperature range make this device appropriate for consumer, appliance, and industrial subsystems. Typical applications include appliance controllers, simple sensor interfaces, LED driving, battery chargers, remote controls, and low-end automotive body electronics. The PIC16C55-XT/SS is commonly designed in where a baseline PIC16C5X instruction set, on-chip oscillator support, and small-form-factor SSOP are needed for cost-optimized production runs. When designing with this device, ensure the OTP memory is programmed before final PCB assembly because OTP cannot be erased after programming. Use Microchip's MPLAB PM3 Universal Device Programmer or equivalent production-grade programmer. Verify the crystal load capacitor values against the chosen XT-mode resonator specification, and budget board space for the decoupling network near VDD. This page synthesizes distributor pricing from DigiKey, Mouser, LCSC, and Octopart, plus drop-in alternatives from the Microchip baseline PIC16C5X family and pin-compatible PIC16F successors, alongside practical design notes not consolidated on any single manufacturer page.

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PIC16C55-XTE/P

PIC16C55-XTE/P - 8-bit OTP MCU 768B 4MHz 28-PDIP | Microchip

The Microchip Technology PIC16C55-XTE/P is an 8-bit CMOS RISC microcontroller from the foundational PIC16C5x family, offering 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, 24 bytes of data RAM, and 20 general-purpose I/O lines in a 28-pin PDIP (0.600") through-hole package. It executes instructions at a 4 MHz maximum clock rate, supports an instruction cycle of one quarter of the oscillator period, and operates across the standard commercial temperature range with low power consumption typical of CMOS PIC architecture. Background knowledge: An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/EPROM/Flash/OTP), working RAM, and peripheral I/O on one die. The PIC16C5x family introduced Microchip's now-ubiquitous Harvard RISC architecture and 12-bit-wide instruction word, which delivers roughly 2:1 code compression over competing 8-bit CISC controllers of its era. The PIC16C5x sits within the taxonomy: microcontroller -> embedded MCU -> 8-bit MCU -> CMOS RISC MCU -> PIC16 family -> PIC16C5x sub-family. OTP program memory can be written exactly once by a device programmer (versus EPROM which is window-erasable via UV, or Flash which is electrically erasable), making OTP attractive for low-cost production volumes. Key features of the PIC16C55-XTE/P include its 4 MHz oscillator, 20 mA source/sink per I/O, Power-On Reset (POR), a Watchdog Timer (WDT) with dedicated on-chip RC oscillator, a 8-bit real-time timer/counter (RTCC) with 8-bit programmable prescaler, and an EPROM-based code memory with 100K erase/write cycle endurance. The device operates from 2.5 V to 6.25 V and consumes under 2 mA typical at 5 V/4 MHz. Architecturally, the PIC16C55 uses a 12-bit program counter and a two-stage pipeline, allowing most instructions to execute in a single 250 ns instruction cycle at 4 MHz. The Harvard bus separates 12-bit program fetches from 8-bit data accesses, eliminating von Neumann bottleneck. Its 33 single-word/one-cycle instructions simplify assembly development, and an external RC or crystal oscillator drives the timing domain. Typical applications include low-cost consumer appliances, automotive body controllers, hobby and educational platforms, embedded remote-control transmitters, battery-powered instrumentation, and simple industrial control modules. The 28-PDIP package and through-hole mounting make it friendly for prototype breadboarding and hand-soldered repairs. Designers should note that OTP memory cannot be reprogrammed - firmware bugs require a fresh chip. The XTE speed grade denotes the 4 MHz maximum operating frequency; lower-frequency parts (XT, RC, LP, HS variants) trade speed for power savings. For development, Microchip's baseline PIC16C5x family uses the same MPLAB PM3 programmer mentioned on the product page. This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical design notes not collected in any single manufacturer datasheet.

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PIC16C55-XTE/SP

PIC16C55-XTE/SP - 8-Bit OTP MCU, 768B EPROM, 20 I/O, SPDIP-28

The Microchip Technology PIC16C55-XTE/SP is an 8-bit RISC microcontroller from the foundational PIC16C5X family, featuring a 12-bit instruction set and 768 bytes (512 x 12 words) of one-time-programmable (OTP) EPROM program memory in a 28-pin SPDIP (Skinny Plastic DIP) package. Operating from 3.0V to 6.25V supply rails, the device delivers up to 4 MHz maximum clock frequency with 24 bytes of general-purpose SRAM, 20 digital I/O lines, and a 33-instruction opcode set. The PIC16C55-XTE/SP is the Extended Temperature (-40C to +125C), XT (standard resonator/crystal) speed grade variant offered in tube packaging. The PIC16C5X family represents the foundation of Microchip's mid-range 8-bit microcontroller legacy. A microcontroller (MCU) is a single-chip computer containing a CPU, RAM, non-volatile program memory, and peripheral I/O; 8-bit MCUs are used in cost-sensitive embedded applications where simple deterministic control is required. The PIC architecture uses a Harvard structure with separate program and data buses, 12-bit-wide instructions, and a fixed instruction cycle, delivering predictable 4:1 code density and deterministic interrupt latency that are valuable for low-power motor control, sensor signal conditioning, and legacy appliance designs. Key features include a hardware 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, watchdog timer with dedicated on-chip RC oscillator, power-on reset, brown-out detection, and EPROM-based code storage. The device supports 33 single-word, single-cycle instructions with 2:1 code compression over comparable 8-bit MCUs of its era, and offers direct LED drive capability on all 20 I/O pins (sink/source up to 25 mA per pin). The fully static CMOS design eliminates minimum clock-rate constraints. Typical applications include industrial control subsystems, automotive body electronics (non-safety-critical), appliance control boards, security panel keypads, and educational microcontroller training platforms. Because of its deterministic instruction timing and breadboard-friendly DIP package, the PIC16C55 family is widely used in university curricula and rapid prototyping environments. Modern replacements (PIC16F54, PIC16F57) provide flash memory but require software/firmware rewrites, as the OTP EPROM is not electrically re-programmable. When designing with this OTP MCU, account for the one-time-programmable limitation: firmware revisions require re-masking or new silicon. Allocate 1-2 spare I/O pins for in-system test access, and ensure your oscillator circuit (ceramic resonator or crystal + 22 pF caps) matches the XT speed grade. The /MCLR reset pin must be tied to VDD through a 10 kohm pull-up for reliable operation. This part has been widely cloned and second-sourced, but Microchip originals remain the gold standard for longevity and documentation.

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PIC16C55-XTE/P - 8-bit OTP MCU 768B 4MHz 28-PDIP | Microchip

PIC16C55-XTE/SP - 8-Bit OTP MCU, 768B EPROM, 20 I/O, SPDIP-28