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PIC16C56-LP/P - 8-bit 40MHz 1.5KB OTP MCU 18-PDIP | Microchip
PIC16C56-LP/P

PIC16C56-LP/P - 8-bit 40MHz 1.5KB OTP MCU 18-PDIP | Microchip

The Microchip Technology PIC16C56-LP/P is an 8-bit RISC microcontroller from the PIC16C5x family, featuring 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, and 12 I/O pins, housed in a through-hole 18-pin PDIP (0.300 inch / 7.62 mm) package. Operating at up to 40 MHz instruction rate with a low-power (LP) oscillator mode and a commercial temperature grade, this CMOS device targets cost-sensitive, low-power embedded applications. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces such as I/O ports, timers, and possibly analog or communication blocks. The PIC16C5x family belongs to the original baseline PIC architecture, classified within the 8-bit microcontroller hierarchy: 8-bit MCU -> RISC microcontroller -> embedded controller -> semiconductor IC. This family uses a 12-bit-wide instruction word with single-cycle execution across 33 instructions, achieving 2:1 code compression versus earlier 8-bit competitors. Key features include 1.5KB OTP program memory, 25 bytes of general-purpose RAM, 12 bidirectional I/O lines, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, a 2-level deep hardware stack, and support for direct, indirect, and relative addressing modes. The LP suffix denotes the low-power CMOS oscillator option, optimized for crystal or RC operation at lower frequencies (typically 32.768 kHz to 200 kHz) for reduced quiescent current. Seven to eight special-function hardware registers provide the control interface. Architecturally, the device is fully static, employing a RISC pipeline with single-cycle instruction fetch and execution. The Harvard-style separate program and data buses, combined with the 12-bit instruction width, enable deterministic timing suitable for direct bit-banged protocols. The two-level hardware stack constrains subroutine nesting to two levels, with deeper nesting requiring software stack emulation in RAM. Typical applications include low-power battery-operated devices, simple appliance controllers, hardware-replacement glue logic, RC servo control, IR remote transmitters, and educational/training kits. The wide operating voltage range (commonly 2.5 V to 6.0 V) and low-power oscillator make it well-suited to coin-cell or 2xAA powered systems. When designing with this part, note that OTP memory cannot be reprogrammed, so the device is best used in volume production or in-circuit emulation workflows. For field-upgradable firmware, consider the flash-based PIC16F5x equivalent family in the same package. This page synthesizes distributor inventory, drop-in compatible alternatives from the same PIC16C5x family, and practical design notes not found in a single manufacturer datasheet.

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PIC16C56-LP/SO - 8-Bit 40MHz OTP MCU 1.5KB | Microchip SOIC-18
PIC16C56-LP/SO

PIC16C56-LP/SO - 8-Bit 40MHz OTP MCU 1.5KB | Microchip SOIC-18

The Microchip Technology PIC16C56-LP/SO is an 8-bit RISC microcontroller based on the PIC16C5X family, featuring 1.5KB (1K x 12) of One-Time-Programmable (OTP) EPROM program memory and 25 bytes of RAM in a 18-pin SOIC package. It executes instructions at a 40 MHz maximum clock rate, with a 200 ns instruction cycle, delivering approximately 5 MIPS of throughput while drawing only 2 mA typical at 5V across the full operating range. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and programmable I/O on a single silicon die. The PIC16C5X family belongs to the broader category of microcontrollers -> 8-bit MCUs -> RISC microcontrollers -> CMOS EPROM/ROM-based MCUs -> embedded controllers. This class of devices is the workhorse of cost-sensitive, deterministic control applications where predictable instruction timing and ultra-low sleep current matter more than raw compute. Key features of the PIC16C56-LP/SO include 12 I/O pins (bidirectional), a two-level hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, a Watchdog Timer with on-chip RC oscillator for reliable recovery, and a low-power 3.3V/5V operating range. The EPROM-based OTP memory allows prototype and small-volume production programming with a standard programmer such as the MPLAB PM3. Special function hardware registers are mapped in two banks, and the device supports power-on reset, brown-out detection via configuration bits, and a code-protect bit for software security. Architecturally, the PIC16C56 uses a Harvard RISC core with a 12-bit wide instruction word and an 8-bit wide data path, delivering 33 single-word instructions and achieving roughly 2:1 code compression versus typical 8-bit CISC MCUs. The fully static CMOS design eliminates minimum clock-rate requirements, allowing the part to be stopped in software for nano-power sleep. The internal oscillator, optional external RC, crystal, or resonator clock modes, and the EPROM code-protect fuse round out the silicon feature set. Typical applications span low-cost embedded control such as appliance control boards, simple sensor interfaces, automotive body electronics (non-safety), industrial timers and counters, consumer remote controls, and hobbyist/educational 8-bit development. It is often used as a cost-optimized replacement for discrete logic in high-volume products. When designing with this part, note that the OTP EPROM cannot be re-programmed in-circuit - for prototypes, a windowed CERDIP (JW) version exists. Always place a 0.1 uF decoupling capacitor within 5 mm of VDD, and route MCLR through the recommended resistor-capacitor network to ensure clean resets. Compared with Flash-based PIC16F successors, the PIC16C56 offers cost advantages for high-volume production but trades off field re-programmability. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C56-LPE/P - 1KB OTP 8-Bit MCU, 12 I/O, 18-PDIP | Microchip
PIC16C56-LPE/P

PIC16C56-LPE/P - 1KB OTP 8-Bit MCU, 12 I/O, 18-PDIP | Microchip

The Microchip PIC16C56-LPE/P is an 8-bit CMOS EPROM/ROM-based microcontroller in the PIC® 16C family, housed in an 18-pin PDIP (0.300 inch, 7.62mm) package. It integrates 1.5 KB of OTP program memory (organized as 1K x 12 words), 25 bytes of RAM, and 12 digital I/O pins in a RISC architecture with 33 single-word, single-cycle instructions. Operating from 3.0 V to 5.5 V, the part features a low-power (LP) oscillator variant designated by the "LPE" speed grade and an extended temperature range ("E") for industrial environments. A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, I/O peripherals, and clock generation logic on one die. Within the broader semiconductor taxonomy, an MCU is a type of embedded processor (hypernyms: microcontroller -> embedded processor -> microprocessor -> semiconductor). The PIC16C5X family specifically occupies the cost-optimized, OTP-programmable niche, sitting between discrete logic and flash-based modern PIC MCUs in terms of flexibility and unit cost. Key differentiating specifications include the OTP (one-time-programmable) program memory, the EPROM-based die, a 12-bit-wide instruction word providing roughly 2:1 code compression versus competing 8-bit MCUs of its era, and the wide operating voltage range. The device also features an internal reset circuit, watchdog timer, power-on reset, and brown-out detection options depending on configuration bits. The RISC architecture executes each instruction in a single cycle except for program branches, which take two cycles. This deterministic instruction timing simplifies real-time control loop design and improves interrupt response predictability versus accumulator-based 8-bit architectures of similar vintage. Typical applications include low-cost consumer appliances, simple sensor interfaces, automotive body electronics (sub-systems), industrial timers and counters, and legacy embedded designs requiring OTP programming for cost or IP protection. The extended temperature range supports industrial and automotive under-hood deployments. When designing with this device, note that OTP memory cannot be erased or rewritten, so firmware must be fully verified before programming. The "LPE" speed grade pairs a low-power oscillator domain with extended-temperature silicon, typically supporting clock rates up to the LP-domain maximum defined in the PIC16C5X datasheet family. This page synthesizes distributor inventory, parametric comparisons against pin-compatible PIC16C5X siblings and flash-based successors, and practical design notes for migration off the obsolete EPROM die.

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PIC16C56-LPE/SO - 8-Bit 40MHz OTP MCU 1.5KB | Microchip
PIC16C56-LPE/SO

PIC16C56-LPE/SO - 8-Bit 40MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56-LPE/SO is an 8-bit RISC microcontroller from the PIC16C5X baseline family, featuring 1.5 KB (1K x 12) of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, and 12 digital I/O pins, operating at up to 40 MHz clock speed in an 18-pin SOIC package. The 'LP' suffix denotes a low-power oscillator variant (typically a 32.768 kHz to 200 kHz crystal/ceramic resonator drive) and 'E' indicates an extended operating temperature grade of -40C to +125C. An OTP microcontroller is a single-chip processor whose program memory is implemented as one-time-programmable EPROM. Engineers program the device once with a device programmer (such as the MPLAB PM3) and the bit pattern becomes permanent - there is no in-circuit re-programmability. Compared with flash-based MCUs, OTP parts offer a smaller silicon die, lower unit cost at moderate volumes, and superior long-term data retention, making them a strong fit for cost-sensitive, high-volume, fixed-code applications. Key features include a 12-bit wide instruction set providing roughly 2:1 code compression over typical 8-bit CISC architectures, a Harvard bus with separate program and data paths, a watchdog timer, a 5-channel 8-bit ADC on related family members, and dual hardware comparators that double as simple analog front ends. Power-saving SLEEP mode, on-chip power-on reset, and brown-out protection simplify external circuitry. The extended-temperature grade allows deployment in industrial, automotive-cabin, and outdoor environments that exceed the 0-70C commercial range. The PIC16C5X architecture delivers a 200 ns instruction cycle at the maximum 40 MHz oscillator (10 MHz instruction rate equivalent), enabling real-time control loops and modest protocol handling. Its 18-pin SOIC footprint is the industry-standard small-outline 300-mil package, compatible with hand-soldering, reflow, and automated pick-and-place lines. Typical applications include appliance controllers, low-power remote sensor nodes, automotive cabin accessories, security keypads, HVAC damper actuators, white-goods user interfaces, and low-bandwidth industrial sensor signal conditioning where the program logic is fixed at production and unit cost dominates. When designing with the PIC16C56-LPE/SO, plan your code size carefully - the 1K x 12 OTP provides 1024 instructions. Use a low-power 32.768 kHz crystal for battery-operated designs and configure the watchdog timer to recover from firmware lockups. Confirm OTP programming margins across operating temperature before committing to volume production. This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PIC16C56-LPE/SS - 8-Bit 40MHz 1.5KB OTP MCU 20-SSOP | Microchip
PIC16C56-LPE/SS

PIC16C56-LPE/SS - 8-Bit 40MHz 1.5KB OTP MCU 20-SSOP | Microchip

The Microchip Technology PIC16C56-LPE/SS is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, 25 bytes of RAM, and a maximum clock speed of 40MHz in a 20-pin SSOP package. The -L speed grade denotes a low-power oscillator variant (typically 4MHz), and the OTP suffix indicates one-time field-programmable memory rather than UV-erasable EPROM, lowering unit cost for production runs. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/Flash/OTP), data RAM, and peripherals on one die. The PIC16C5X family uses a RISC architecture with 33 single-word, single-cycle instructions, delivering roughly twice the code density of competing 8-bit MCUs in its price class. 8-bit MCUs sit beneath 16-bit and 32-bit parts in the embedded computing hierarchy, but their low cost, deterministic instruction execution, and minimal power consumption make them ideal for cost-sensitive, high-volume, real-time control tasks. Key features of the PIC16C56-LPE/SS include a 12-bit instruction word, 12 I/O lines arranged as Port A (4 lines) and Port B (8 lines), a Watchdog Timer (WDT) for runaway code recovery, Power-On Reset (POR) for clean startup, and a wide 2.5V to 6.25V operating voltage range. The device uses a Harvard architecture with separate program and data buses, and CMOS fabrication for low static current draw. The 20-SSOP package measures 5.30mm wide, supporting compact surface-mount designs. The PIC16C56 implements Microchip's original baseline PIC architecture with two hardware stack levels and no interrupts (interrupts were added in the later PIC16C6X/7X families). Code execution is fully static, allowing the clock to be stopped without losing state, which is valuable for battery-sleep modes. Programming is performed via Microchip's ICSP protocol using tools such as the MPLAB PM3 Universal Device Programmer. Typical applications for the PIC16C56-LPE/SS include low-cost consumer appliance controls, battery-powered remote sensors, LED driver controllers, simple timer-based products, and replacement of discrete logic in glue-logic consolidation. The 4MHz oscillator grade (L) suits low-power timing applications where clock speed is not critical. When designing with the PIC16C56, note that OTP memory cannot be reprogrammed or erased - firmware must be 100% verified before production programming. Use the PIC16F56 flash-based equivalent (or PIC16C56A revision) for development or small-batch runs, then transition to the OTP PIC16C56 for cost-optimized high-volume manufacturing. This page synthesizes distributor pricing, drop-in alternative listings, application context, and design notes that the bare Microchip datasheet does not compile in one place, providing engineers and buyers with a single reference for sourcing and engineering decisions.

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PIC16C56-LPI/P - 8-bit CMOS MCU, 1KB EPROM, 18-PDIP | Microchip
PIC16C56-LPI/P

PIC16C56-LPI/P - 8-bit CMOS MCU, 1KB EPROM, 18-PDIP | Microchip

The Microchip PIC16C56-LPI/P is an 8-bit CMOS EPROM/ROM-based microcontroller in the PIC16C5X family, offering 1 KB of program memory, 25 bytes of RAM, and 12 I/O pins in a 18-pin PDIP (through-hole) package. It operates from 3.3 V or 5 V supplies and supports the industrial temperature range. The device uses a RISC architecture with 12-bit-wide instructions and an 8-bit-wide data path, delivering 2:1 code compression over competing 8-bit microcontrollers in its class. A microcontroller (MCU) is an integrated circuit that combines a CPU core, program memory, RAM, and peripherals on a single die. The PIC16C56-LPI/P belongs to the 8-bit microcontroller hierarchy: microcontroller -> RISC MCU -> CMOS EPROM MCU -> PIC16C5X family. EPROM-based MCUs are one-shot programmable devices widely used in volume production where the program is finalized at manufacturing time, offering a lower unit cost than Flash-based parts. Key features include seven or eight special-function hardware registers, a two-level deep hardware stack, and direct, indirect, and relative addressing modes for both data and instructions. An 8-bit real-time clock/counter (TMR0) supports timing, event counting, and simple PWM generation. The 12-bit instruction word enables a compact opcode set that yields efficient code density for control-oriented tasks. The architecture is implemented in CMOS technology with EPROM program memory, providing low power consumption and non-volatile code storage. The RISC pipeline and Harvard-style separate program/data buses allow most instructions to execute in a single instruction cycle, giving predictable timing suitable for control loops and state machines. Typical applications include appliance control, sensor interfacing, low-cost consumer electronics, industrial timers, and simple motor or relay drivers. The 12 I/O pins can be allocated to digital inputs, digital outputs, or TMR0-related functions such as external clock input and timer overflow output. When designing with this device, note that EPROM parts are windowed for UV erasure and are not in-system programmable; design firmware carefully before committing to masked silicon. The two-level hardware stack limits nested subroutine depth to two levels, so deeply nested C-style code requires careful refactoring into a flat call structure. This page synthesizes distributor pricing, parametric comparison with same-family parts, and practical design considerations not found in the manufacturer datasheet alone.

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PIC16C56-LPI/SO - 8-bit 40MHz OTP MCU, 1.5KB, 12 I/O | Microchip
PIC16C56-LPI/SO

PIC16C56-LPI/SO - 8-bit 40MHz OTP MCU, 1.5KB, 12 I/O | Microchip

The Microchip Technology PIC16C56-LPI/SO is an 8-bit CMOS OTP microcontroller from the PIC16C5x family, featuring 1.5KB (1K x 12) of program memory, 25 bytes of RAM, and 12 I/O pins in an 18-pin SOIC package. It operates at up to 40MHz using a 12-bit instruction word with a 2:1 code compression advantage over competing 8-bit MCUs in its class. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), working RAM, and programmable I/O peripherals into one package. Within the broader taxonomy, the PIC16C56 belongs to the 8-bit microcontroller category, which sits under the microcontroller family, then embedded processors, and finally the integrated circuit hierarchy. The PIC16C5x series occupies the entry-level/low-cost node of Microchip's 8-bit portfolio and is widely used in cost-sensitive, deterministic control loops where a few milliamps of I/O drive and a few hundred bytes of RAM are sufficient. Key features include a 7-stage or 8-stage special-function register file, a two-level deep hardware call stack, direct/indirect/relative addressing modes for both data and instructions, and an 8-bit real-time clock/counter (TMR0). The CMOS process delivers low power consumption across the 2.0V-6.25V operating range, while the 12 I/O pins support direct LED drive and TTL/CMOS-compatible logic levels. Architecturally, the PIC16C56 uses a Harvard RISC-like core with single-cycle instruction execution (except branches) and an OTP EPROM program memory that is one-time programmable, making it suited for low-volume mature designs rather than field-upgradable firmware. The 12-bit wide instruction path provides efficient encoding for byte-oriented control code. Typical applications include appliance control, remote controls, security peripherals, sensor interfaces, and consumer white-goods sub-systems. The wide operating temperature and 12 I/O count make it adaptable to compact industrial or commercial embedded designs. The PIC16C56-LPI/SO is recommended for new designs only when the OTP nature and 1.5KB code limit align with the production profile; engineers should evaluate Flash-based PIC16F5x alternatives for new development where field reprogrammability is required.

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PIC16C56-LPI/SS - 1.5KB OTP 8-bit MCU | Microchip | 20-SSOP
PIC16C56-LPI/SS

PIC16C56-LPI/SS - 1.5KB OTP 8-bit MCU | Microchip | 20-SSOP

The Microchip Technology PIC16C56-LPI/SS is a low-power, 8-bit RISC microcontroller with 1.5KB (1K x 12) One-Time-Programmable (OTP) program memory, 25 bytes of RAM, and 12 programmable I/O lines, housed in a 20-pin SSOP (Shrink Small Outline Package). It executes instructions from a 12-bit-wide instruction word on an 8-bit-wide data path at clock speeds up to 40 MHz, delivering approximately 5 MIPS of throughput for embedded control loops. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable I/O peripherals. The PIC16C5X family from Microchip is one of the earliest RISC-architecture 8-bit MCU lines, positioned as a low-cost, high-performance, fully-static, EPROM/ROM-based solution intended for high-volume consumer and industrial control. The PIC16C56 is the smallest-memory member of this family, sitting in the product taxonomy as: PIC16C56 -> PIC16C5X family -> PIC16C base series -> 8-bit PIC microcontrollers -> microcontrollers -> embedded semiconductors. Key features include 12-bit wide instructions, a two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0), and seven or eight special-function hardware registers. The "LP" oscillator mode prefix indicates a low-power 32.768 kHz crystal designator, and the "I" suffix denotes the industrial operating-temperature range of -40 °C to +85 °C. The architecture is a Harvard-class RISC core that fetches a 12-bit instruction from program memory while simultaneously accessing an 8-bit data operand from RAM, allowing most instructions to complete in a single instruction cycle. Two-level hardware stack simplifies interrupt-free control flow and keeps the silicon area (and cost) low, which is why OTP variants like the PIC16C56-LPI/SS remain attractive for cost-sensitive production runs. Typical applications include remote-control transmitters, small appliance controllers, LED drivers, toys, simple sensor interfaces, low-end battery chargers, and replacement of discrete logic gates with programmable state machines. The 12-bit-wide instruction set is unusually compact for the storage class, making the 1.5KB program space sufficient for tight state-machine firmware. When designing with this part, choose an OTP programmer compatible with the PIC16C5X series (such as the MPLAB PM3) for in-circuit or socket programming. Plan the program size carefully - OTP cannot be erased or rewritten once programmed, so the development cycle should prototype on a UV-erasable (JW) windowed ceramic variant first. This page synthesizes distributor pricing, same-family drop-in alternatives (PIC16C55, PIC16C54, PIC16C56A), and practical OTP-programming design notes not found in the manufacturer datasheet alone.

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PIC16C56-RC/P - 8-Bit 4MHz OTP MCU 1.5KB | Microchip
PIC16C56-RC/P

PIC16C56-RC/P - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56-RC/P is an 8-bit CMOS microcontroller from the PIC16C5X family, featuring 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, 25 bytes of RAM, and 12 digital I/O pins, all housed in an 18-pin PDIP through-hole package. It operates at a maximum clock speed of 4 MHz with an RC oscillator option (denoted by the 'RC' speed code) and runs across a supply voltage range of 2.5V to 6.0V, making it compatible with both 3V coin cells and 5V regulated rails. What is an 8-bit OTP microcontroller? An 8-bit microcontroller is a small computer-on-a-chip that processes data 8 bits at a time, typically used for embedded control tasks. OTP (One-Time Programmable) means the program memory can be written only once after manufacture, offering lower per-unit cost than flash-based MCUs while still providing permanent code storage. The PIC architecture falls within the broader hierarchy: microcontroller -> embedded processor -> semiconductor IC. The PIC16C5X family is positioned as Microchip's baseline 12-bit instruction, 8-bit data path RISC architecture. Key differentiating features of the PIC16C56-RC/P include a 12-bit wide instruction set with 33 single-word/cycle instructions providing 2:1 code compression over comparable CISC 8-bit MCUs, a two-level deep hardware stack for subroutine nesting, and direct/indirect/relative addressing modes for both data and instructions. The integrated 8-bit Timer0 (TMR0) with a programmable prescaler provides event counting and timing functions, while a watchdog timer improves system reliability in unattended applications. The PIC16C56 uses a Harvard architecture with separate program and data buses, which allows instruction fetch and data access to occur in the same instruction cycle. The RC oscillator variant ('RC' suffix code) accepts an external resistor/capacitor network at the OSC1 pin for low-cost clock generation, eliminating the need for a crystal or ceramic resonator. Power-down (Sleep) mode reduces current consumption to microamp levels for battery-powered applications. Typical applications include low-cost consumer appliances, remote controls, sensor interface nodes, simple motor controllers, LED display drivers, and battery-powered devices such as toys and handheld instruments. The 12 I/O pins can directly drive LEDs or interface to analog circuitry through external components. When designing with this device, engineers should note that OTP memory cannot be reprogrammed in-circuit, so development typically uses a windowed (JW) or flash-based sibling first. Ensure RC oscillator component values follow Microchip's recommended ranges for stable operation across the operating temperature range. This page synthesizes distributor pricing, drop-in alternative MPNs from Microchip's PIC16C5X family, and practical design notes that are not consolidated in the manufacturer datasheet, enabling faster component selection.

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PIC16C56-RC/SO - 8-Bit 4MHz OTP MCU, 1.5KB | Microchip
PIC16C56-RC/SO

PIC16C56-RC/SO - 8-Bit 4MHz OTP MCU, 1.5KB | Microchip

The Microchip Technology PIC16C56-RC/SO is a member of the PIC16C5X family of low-cost, high-performance, 8-bit fully-static EPROM/ROM-based CMOS microcontrollers. It integrates 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, and 12 bidirectional I/O pins, with an external RC-oscillator clock input and a maximum operating frequency of 4 MHz, all housed in an 18-pin SOIC (SO) package rated for a 3.0V to 6.25V supply. A microcontroller (MCU) is a single-chip computer containing a CPU, program memory, working RAM, and configurable I/O peripherals. The PIC16C5X family belongs to Microchip's original baseline RISC 8-bit architecture, employing only 33 single-word/single-cycle instructions to deliver 2:1 code compression over competing 8-bit MCUs in its class. This particular variant uses an RC oscillator input, allowing designers to set the system clock with a simple external resistor and capacitor — a low-cost timing solution for non-critical timing applications. Key features include a 12-bit-wide instruction word, 8-bit-wide data path, seven or eight Special Function Registers (SFRs), a two-level-deep hardware stack, and direct/indirect/relative addressing modes. An 8-bit Timer0 (TMR0) with a prescaler provides real-time event counting and basic periodic interrupt capability. The 12 I/O pins are arranged as PORTA and PORTB, each capable of driving CMOS or TTL loads. The integrated Power-on Reset (POR), Watchdog Timer (WDT), and code-protection features support reliable standalone operation. The RC oscillator variant ("RC" in the part number) trades the precision of a crystal for a lower BOM cost and faster power-on. Architecturally, the PIC16C56 employs a Harvard design that separates program and data buses, allowing instruction fetch and data access to occur in the same cycle. This, combined with the 12-bit opcode width and 33-instruction RISC set, results in deterministic interrupt latency and compact code density. The 4 MHz instruction rate (1 MIPS) is sufficient for slow control loops, human-interface button debouncing, sensor sampling at sub-kHz rates, and simple LED multiplexing. Typical applications include low-cost consumer appliances, appliance remote controls, LED display drivers, simple sensor interfaces, battery-powered toys, and replacement of discrete logic in legacy designs. Designers choose the PIC16C56-RC/SO when cost per unit is the deciding factor, the application tolerates RC-oscillator frequency tolerance, and OTP programming for production is acceptable. When designing with this part, calculate the worst-case supply current from the datasheet DC characteristics and ensure the external RC component values stay within the manufacturer's recommended ranges for stable oscillation across temperature. Note that the OTP memory can be programmed only once, so production code must be fully validated before device programming. This page synthesizes distributor pricing, drop-in alternatives within the PIC16C5X family, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C56-RC/SS - 8-bit 4MHz OTP MCU 1.5KB | Microchip
PIC16C56-RC/SS

PIC16C56-RC/SS - 8-bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56-RC/SS is an 8-bit RISC EPROM/ROM-based CMOS microcontroller in the PIC16C5X family, packaged in a 20-pin SSOP (5.30 mm body width) with surface-mount gull-wing leads. It integrates a 4 MHz CPU core, 1.5 KB (1K x 12) of One-Time-Programmable (OTP) program memory, and 25 bytes of RAM, all rated for a 3.3V/5V dual-voltage supply domain. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, program memory (ROM/EPROM/Flash), data memory (RAM), and peripheral set on one die. Within the broader taxonomy, an MCU sits under microprocessor -> microcontroller -> embedded controller -> semiconductor. PIC microcontrollers are RISC-based devices known for a small instruction set, low power, and deterministic interrupt response; the PIC16C5X sub-family uses a 12-bit-wide instruction word and a 2-level hardware stack, making it one of the most resource-constrained but lowest-cost Microchip offerings. Key features include 12 I/O pins, a single 8-bit timer/counter (TMR0) with a prescaler, 33 single-word single-cycle instructions, direct/indirect/relative addressing modes, and a watchdog timer for unattended operation. The 'RC' suffix denotes the resonator/RC oscillator clock option, which lets the design use an external RC network or ceramic resonator instead of a crystal, reducing BOM cost. The /SS suffix indicates the 20-pin SSOP industrial/commercial temperature grade package. The PIC16C56 implements a Harvard architecture with separate program and data buses, a 2-level deep hardware call stack, and 7-8 special function hardware registers. Program memory is OTP, meaning it is written once and not erasable, which favors mature production designs where firmware is finalized and unit cost dominates over reprogrammability. Typical applications include low-cost consumer appliances, sensor signal conditioning front-ends, simple motor controllers, remote-control transmitters, and battery-powered metering devices where the 4 MHz instruction rate and small pin count are sufficient. Design with OTP memory in mind: once programmed, the device cannot be erased. Plan firmware revisions using a Flash-based PIC16F5X cousin during development, then port to PIC16C56 for production cost reduction. This page synthesizes distributor pricing, verified drop-in alternatives from the PIC16C5X family, and practical design notes that go beyond the manufacturer datasheet's parameter tables.

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PIC16C56-RCE/P - 8-Bit 4MHz OTP MCU, 1.5KB, 12 I/O | 18-PDIP
PIC16C56-RCE/P

PIC16C56-RCE/P - 8-Bit 4MHz OTP MCU, 1.5KB, 12 I/O | 18-PDIP

The Microchip Technology PIC16C56-RCE/P is an 8-bit RISC microcontroller from the PIC16C5x family, operating at up to 4 MHz with 1.5 KB (1K x 12) of One-Time-Programmable (OTP) program memory, housed in a through-hole 18-pin PDIP package. It integrates 25 bytes of general-purpose RAM, 12 digital I/O lines, and a two-level hardware stack, while supporting supply voltages from 3.0 V to 6.0 V across the commercial/industrial/automotive temperature ranges. What is a PIC16C5x microcontroller? The PIC16C5x family is Microchip's baseline 8-bit OTP MCU family using a 12-bit instruction word and Harvard architecture with separate program and data buses, which allows instruction fetch and operand read to occur in a single cycle. Within the broader taxonomy, the PIC16C5x is an 8-bit microcontroller, which is itself a subset of microcontrollers, which fall under microcontrollers, which sit inside the Integrated Circuits category and ultimately under semiconductors. The family is widely used for cost-sensitive, high-volume embedded control where flash reprogrammability is not required and where the device will be programmed once at production and discarded if the firmware is ever revised. Key features of the PIC16C56-RCE/P include the RISC core delivering roughly 50% code compression versus competing 8-bit CISC architectures, an integrated Power-on Reset (POR) block, a Watchdog Timer (WDT) with its own on-chip RC oscillator, and an operating speed selectable from DC to 4 MHz. The device is offered in the -RCE speed/voltage grade, where 'R' denotes the low-frequency RC oscillator variant (typically DC to 4 MHz), 'C' indicates the commercial temperature range, and 'E' signifies the OTP program-memory option. Together these features deliver a small-footprint, deterministic controller suitable for very low-cost white goods, toys, and replacement of discrete logic. Typical applications include automotive sub-system controllers, industrial timer/sequencer modules, consumer appliance control boards, and general-purpose glue-logic replacement. The 12 I/O pins can directly drive LEDs, triacs, and small relays when paired with appropriate external buffers. When designing with this part, plan the OTP programming step into the manufacturing flow because OTP memory cannot be field-updated. For field-updatable equivalents in the same family footprint, consider the PIC16F5x flash-based derivatives as an alternative upgrade path. This page synthesises distributor pricing, drop-in package-compatible alternatives within the PIC16C5x family, and practical design notes that go beyond the raw specification sheet.

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PIC16C56-RCE/SO - 8-Bit 4MHz OTP MCU 1.5KB | Microchip
PIC16C56-RCE/SO

PIC16C56-RCE/SO - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56-RCE/SO is an 8-bit OTP (One-Time Programmable) CMOS microcontroller from the PIC16C5X family, packaged in an 18-pin SOIC and clocked by an external oscillator at up to 4 MHz. It integrates 1.5 KB of program memory (1K x 12 wide EPROM/ROM) and 25 bytes of general-purpose RAM, and exposes 12 digital I/O pins through PORTA and PORTB, plus an integrated Power-On Reset (POR) and Watchdog Timer (WDT). An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, on-chip program memory, RAM, and integrated peripherals such as timers, reset circuitry, and I/O ports. MCUs sit within the broader hierarchy: microcontroller -> embedded processor -> semiconductor device -> integrated circuit. The PIC16C5X family is Microchip's foundational baseline architecture using 12-bit-wide instructions and a Harvard memory layout, delivering roughly 2:1 code compression over competitive 8-bit MCUs of its era. Because PIC16C56 OTP parts can be programmed exactly once, they are aimed at high-volume production where code is fixed and firmware field updates are not required. Key features of the PIC16C56-RCE/SO include a 3.25 V to 6.0 V single-supply range, an extended operating temperature window of -40 C to +125 C, fully static CMOS design for low quiescent current, and a 4 MHz maximum external clock rate that yields an instruction cycle of 1 microsecond (one-quarter of the oscillator period, four clocks per instruction). The SO package variant supports surface-mount assembly on standard reflow profiles, while the same die is also offered in PDIP and windowed CERDIP for development. Architecturally, the device uses a RISC-style instruction set with 33 single-word/12-bit instructions, a two-level deep hardware stack, and dedicated SFRs for I/O and configuration. Configuration is performed by programming bits that select oscillator type, WDT enable, code protection, and brown-out options. Typical applications include industrial automation controllers, simple consumer appliances, automotive body and chassis subsystems, replacement of discrete logic in glue-logic designs, and remote sensor transmitters. Designers most often choose this device when the BOM must remain below one dollar and the firmware is stable across the product lifecycle. When designing with PIC16C56-RCE/SO, plan for programming before final assembly: OTP parts cannot be reprogrammed in-circuit, so a parallel programming socket or gang programmer is required. Validate brown-out and WDT behavior across the full -40 C to +125 C operating window, and add bulk capacitance on VDD if the application drives heavy transient loads. This page consolidates verified distributor pricing, drop-in alternatives from the PIC16C5X family, and practical engineering notes that are not gathered together on any single manufacturer or distributor page.

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PIC16C56-RCE/SS - 8-Bit 4MHz OTP MCU 1.5KB | Microchip
PIC16C56-RCE/SS

PIC16C56-RCE/SS - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56-RCE/SS is an 8-bit RISC microcontroller from the PIC16C5x family, offering 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory and 25 bytes of data RAM, housed in a 20-pin SSOP (Shrink Small Outline Package). It executes instructions at a 4 MHz clock rate, delivering roughly 1 MIPS performance from its 33-instruction RISC instruction set. The device integrates essential system peripherals including Power-On Reset (POR), Watchdog Timer (WDT), and a selectable oscillator, making it well-suited for compact, cost-sensitive embedded control applications. An 8-bit OTP microcontroller is a single-chip computer built around an 8-bit data path with non-volatile program memory that can be written only once. OTP parts sit in the hierarchy between mask-ROM devices (cheapest at volume, but require fab NRE) and flash-based MCUs (re-programmable, higher cost per bit). They are typically used in cost-engineered high-volume products where code stability is finalized before production and field re-programming is not required. Key features of the PIC16C56-RCE/SS include 12 I/O pins with individual direction control, a 4 MHz maximum operating frequency, 2.0V to 6.0V wide operating voltage range, low-power CMOS architecture, and automotive temperature grade support. The 20-SSOP package provides a compact 5.30 mm body width with gull-wing leads suitable for high-density surface-mount assembly. Architecturally, the device uses a Harvard-style RISC core with separate program and data buses, a 12-bit wide program memory bus, and a hardware accumulator plus working register. The 8-level deep stack and direct/indirect addressing modes support efficient subroutine nesting and table reads. Its CMOS process keeps typical active current in the low milliampere range, enabling battery-friendly designs. Typical applications include automotive body electronics and sensor interfaces, simple consumer appliance controllers, security and alarm peripherals, LED lighting controllers, and remote-control transmitter logic. The 20-pin SSOP footprint allows placement on boards where DIP-20 footprint parts would otherwise be used. When designing with this OTP part, plan firmware carefully: once programmed, the device cannot be re-flashed in-circuit. Use a flash-equipped sibling (e.g., PIC16F5x) for prototypes, then migrate to PIC16C56-RCE/SS for production cost-down. The automotive temperature grade (-40C to +125C) makes it suitable for under-hood and dashboard modules. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the bare manufacturer datasheet, helping engineers evaluate sourcing risk for this mature 8-bit OTP device.

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PIC16C56-RCI/SO - 8-bit EPROM MCU, 12 I/O, SOIC-18 | Microchip
PIC16C56-RCI/SO

PIC16C56-RCI/SO - 8-bit EPROM MCU, 12 I/O, SOIC-18 | Microchip

The Microchip Technology PIC16C56-RCI/SO is an EPROM/ROM-based 8-bit CMOS microcontroller from the PIC16C5X family, featuring a RISC architecture, 12-bit wide instructions, an 8-bit wide data path, and twelve I/O pins in an 18-pin SOIC package. It operates from a 3.3V or 5V supply at industrial temperature range and is supplied in tube packaging. An 8-bit CMOS microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one die. The PIC16C5X family belongs to the high-performance, fully-static EPROM/ROM-based CMOS microcontroller hierarchy, which sits under the broader class of microcontrollers and embedded processors within the semiconductor taxonomy. These devices deliver an order-of-magnitude higher performance than competitors in the same price category thanks to the 12-bit wide instruction set that produces 2:1 code compression over other 8-bit MCUs in its class. Key features include seven or eight special-function hardware registers, a two-level deep hardware stack, and direct, indirect, and relative addressing modes for both data and instructions. The PIC16C56 integrates an 8-bit real-time clock/counter (TMR0), watchdog timer, and EPROM program memory. The 'RCI' suffix designates the RC oscillator variant with industrial temperature grade, while '/SO' denotes the SOIC-18 package and tube media. The architecture uses a RISC instruction set with only 33 single-cycle instructions, enabling deterministic interrupt response and tight code density. With 1.5 KB of EPROM program memory and 25 bytes of RAM, the device targets cost-sensitive embedded applications. The EPROM cell technology allows one-time-programmable (OTP) customization at production time, while a JW (windowed) ceramic variant is available for prototype development. Typical applications include appliance control, low-end automotive subsystems, sensor signal conditioning, and simple embedded logic replacement. The wide operating voltage and RC oscillator tolerance make it well suited to cost-driven white goods, hobby electronics, and educational platforms where an external crystal is undesirable. When designing with the PIC16C56-RCI/SO, engineers should note that the PIC16C56 family is designated 'Not Recommended for new designs' by Microchip, so it should be specified only for maintenance of legacy systems. New designs should consider the flash-based PIC16F or enhanced mid-range PIC16F1XX families as pin-compatible modern replacements. This page synthesizes distributor pricing, parametric cross-reference data, and practical design notes drawn from real component databases to support both maintenance engineers sourcing legacy parts and procurement teams validating second-source supply for end-of-life inventory.

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PIC16C56-XT/SS - 8-bit OTP MCU, 4MHz, 20-SSOP | Microchip
PIC16C56-XT/SS

PIC16C56-XT/SS - 8-bit OTP MCU, 4MHz, 20-SSOP | Microchip

The Microchip PIC16C56-XT/SS is an 8-bit RISC CMOS microcontroller from the PIC16C5X family with 1.5KB of one-time-programmable (OTP) program memory, packaged in a 20-pin SSOP (0.209 inch / 5.30 mm width) tube format. Operating from 3.0V to 5.5V with a 4 MHz external XT crystal oscillator clock input, it integrates 25 bytes of general-purpose RAM, a hardware 8-bit timer/counter (TMR0), a two-level deep hardware stack, and direct/indirect/relative addressing modes. A microcontroller (MCU) is a single-chip computer containing a processor core, memory, and programmable I/O peripherals. The PIC16C5X family belongs to the broader category of 8-bit microcontrollers -> RISC microcontrollers -> embedded controllers -> semiconductors. PIC microcontrollers use a Harvard architecture with separate program and data paths, and the 16C5X baseline family is the simplest tier of the PIC16 lineup, offering 12-bit-wide instructions, 33 single-word/cycle instructions, and 2:1 code compression over comparable 8-bit CISC MCUs in its class. Key features include 12-bit-wide instructions, 8-bit-wide data path, seven or eight special function hardware registers, a watchdog timer, an 8-bit real-time clock/counter (TMR0) with 8-bit programmable prescaler, Power-on Reset, power-saving SLEEP mode, and up to 12 bidirectional I/O pins. The XT suffix designates the external crystal oscillator clock option (4 MHz max), and the SS suffix denotes the 20-pin SSOP package. The PIC16C56 is the OTP-programmed variant; the PIC16C57 is its pin-compatible larger-memory sibling. Architecturally, the PIC16C56-XT/SS uses CMOS EPROM-based program memory with 1K x 12 organization, providing approximately 1.5KB of code space. The two-level hardware stack supports nested subroutine calls, and the instruction set provides bit, byte, and literal operations with single-cycle execution on most instructions (200 ns at 20 MHz equivalent cycle). Commercial-grade temperature range (0°C to +70°C) is standard for this part. Typical applications include legacy embedded control, simple timer/counter systems, low-cost consumer appliances, sensor signal conditioning, HVAC controls, and small motor control where cost, deterministic timing, and minimal external component count are critical. The OTP memory suits volume production where code is finalized, eliminating per-unit programming cost. When designing with this part, ensure the external XT-mode crystal is sized for the 4 MHz maximum and that decoupling capacitors are placed close to VDD/VSS pins. The PIC16C56 is the OTP version; if in-system reprogrammability is required during development, consider the PIC16F54 baseline Flash MCU or a PIC16F1xxx mid-range part as a modernized replacement with a different footprint. This page synthesizes distributor pricing, drop-in pin-compatible alternatives within the PIC16C5X family, and practical design notes not found in the manufacturer datasheet.

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PIC16C56-XTE/SO - 8-bit OTP MCU, 1.5KB EPROM, SOIC-18 | Microchip
PIC16C56-XTE/SO

PIC16C56-XTE/SO - 8-bit OTP MCU, 1.5KB EPROM, SOIC-18 | Microchip

The Microchip Technology PIC16C56-XTE/SO is an 8-bit, fully static, EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, packaged in an 18-pin SOIC (SO) wide-body tube. It integrates a 12-bit-wide instruction set with 33 single-word, single-cycle instructions, 1.5 KB of EPROM program memory, and 25 bytes of general-purpose RAM, with 12 digital I/O lines and a 4 MHz maximum operating frequency. The PIC16C5X family is a low-cost, high-performance line of RISC microcontrollers. RISC (Reduced Instruction Set Computer) architectures use a small, fixed-length instruction set that executes in a single clock cycle, enabling higher code density and faster deterministic response than CISC designs. In the PIC16C5X hierarchy the device sits above the PIC16C54 and below the PIC16C57/PIC16C58 family members, and serves as the foundation for the entire PICmicro baseline architecture that introduced Harvard separation of program and data memory to the 8-bit microcontroller market. Key features include 1.5 KB of one-time-programmable (OTP) EPROM program memory, 25 bytes of RAM, 12 I/O pins with individual direction control, a watchdog timer with its own on-chip RC oscillator, an 8-bit real-time timer/counter, and power-saving SLEEP mode. The device operates from 3.0 V to 6.0 V, supports oscillator frequencies up to 4 MHz at 5 V (10 MHz at the higher voltage grade), and provides an internal power-on reset circuit. The XT suffix designates a standard quartz-crystal oscillator option; the /SO suffix designates the 18-pin SOIC wide-body package. Architecturally, the PIC16C56-XTE/SO employs a Harvard architecture with separate program and data buses, allowing instruction fetch to occur in parallel with operand read/write. The 12-bit instruction word yields 2:1 code compression compared with competing 8-bit controllers, and the 33-instruction instruction set produces highly symmetric assembly code. An 8-level hardware stack supports subroutine nesting and interrupt context saving. Typical applications include low-cost consumer appliances, automotive subsystems (body controllers, sensor interfaces), industrial control, smart-card and security peripherals, simple sensor signal conditioning, and battery-powered embedded products where the low-cost OTP EPROM and minimal external component count are decisive. The wide operating voltage range (3.0 V to 6.0 V) also suits 5 V regulated rails and 3.3 V battery stacks. Design consideration: Because the PIC16C56 uses one-time-programmable EPROM, code cannot be erased in-circuit. For development, designers should use a windowed ceramic package (JW) variant or migrate to the Flash-based PIC16F5X family when code revisions are anticipated. This page synthesizes distributor pricing, pin-compatible alternatives, and practical design notes drawn from Microchip PIC16C5X datasheets and reference documentation not consolidated on the manufacturer product page.

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PIC16C56-XTE/SS - 8-bit OTP MCU, 4MHz, 1.5KB | Microchip
PIC16C56-XTE/SS

PIC16C56-XTE/SS - 8-bit OTP MCU, 4MHz, 1.5KB | Microchip

The Microchip Technology PIC16C56-XTE/SS is an 8-bit PIC microcontroller based on the PIC16C5X family, featuring 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory and 25 bytes of RAM, operating at up to 4MHz from a 3.0V to 5.5V supply in a 20-pin SSOP package. What is an 8-bit OTP microcontroller? An 8-bit OTP (One-Time Programmable) microcontroller is a low-cost, high-performance, fully static CMOS processor that combines a CPU, non-volatile program memory, RAM, and I/O peripherals on a single die. It belongs to the microcontroller family (microcontroller -> MCU -> embedded controller -> semiconductor device) and is typically used in cost-sensitive, high-volume embedded applications where firmware is finalized before production and field re-programmability is not required. Key features of the PIC16C56-XTE/SS include 12 I/O pins, a programmable Watchdog Timer (WDT) for code-execution monitoring, a Power-On Reset (POR) circuit, and an internal RC oscillator option. The device executes 33 single-word, single-cycle RISC instructions, delivering roughly 4 MIPS at 4MHz with 2:1 code compression over competing 8-bit architectures. Code is stored in 12-bit-wide OTP EPROM. The PIC16C56 uses a Harvard RISC architecture with a separate 12-bit instruction bus and 8-bit data bus, plus a two-stage pipeline that lets most instructions complete in one oscillator cycle. The 12-bit-wide opcodes are highly orthogonal and produce the well-known 2:1 code-compression advantage over other 8-bit MCUs in its class, reducing program-memory pressure on the 1K-word OTP array. CMOS fabrication ensures low static power consumption for always-on or battery-leak applications. Typical applications for the PIC16C56-XTE/SS include simple consumer appliances, remote-control key fobs, sensor-interface modules, low-end toys, LED drivers, and small household devices that need deterministic real-time control without field firmware updates. The 4MHz clock is sufficient for slow control loops and human-interface timing. When designing with the PIC16C56-XTE/SS, note that the OTP memory cannot be re-programmed in-circuit, so firmware must be verified on a windowed (JW) or equivalent emulator part before committing to production. Place a 0.1uF decoupling capacitor close to VDD, and respect the 3.0V-5.5V supply range to guarantee timing margins at 4MHz. Sleep mode lowers IPD to a few microamps for battery duty. This page synthesizes distributor pricing, drop-in SSOP-20 alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PIC16C56-XTI/P - 8-bit 4MHz OTP MCU 1.5KB | Microchip
PIC16C56-XTI/P

PIC16C56-XTI/P - 8-bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56-XTI/P is an 8-bit RISC microcontroller belonging to the legacy PIC16C5X family, housed in a 18-pin PDIP through-hole package. It integrates 1.5KB (1K x 12 words) of One-Time-Programmable (OTP) EPROM program memory, 25 bytes of general-purpose RAM, and 12 digital I/O pins, all clocked by a 4MHz internal oscillator. The -XTI suffix designates the 4MHz XT oscillator range with industrial temperature grade (-40C to +85C), and the /P suffix indicates the PDIP-18 package. An 8-bit microcontroller (MCU) is a single-chip computer built around a central processing unit with an 8-bit data path, integrated program memory, working RAM, and configurable I/O peripherals. The PIC16C5X family uses a RISC architecture with only 33 single-word/single-cycle instructions, providing predictable 1:1 instruction-to-clock timing that simplifies deterministic control firmware. As a member of the broader MCU hierarchy, this device sits at the simple-control end of the spectrum: PIC16C5X -> PIC16 family -> 8-bit PIC microcontrollers -> microcontrollers -> embedded computing -> semiconductors. Key features include 12-bit-wide instruction words with 8-bit-wide data path, a two-level deep hardware stack, direct/indirect/relative addressing modes, and a single 8-bit Timer0 (TMR0) with an 8-bit prescaler. The device operates from 3.0V to 5.5V and is fabricated on a low-power CMOS process. Compared to its contemporaries in the same price band, the PIC16C5X family delivers roughly an order of magnitude higher performance per MHz. The architecture uses a separate instruction and data bus (Harvard architecture) which allows instruction fetch and operand access to occur in the same clock cycle. The OTP EPROM enables low-volume prototyping and production without mask charges, making it suitable for mature products where Flash reprogrammability is not required and unit cost dominates. Typical applications include low-cost appliance control, LED driver sequencers, simple sensor front-ends, and legacy industrial timer/controller modules that were designed around the PIC16C5X instruction set. Because the OTP variant is one-time programmable, this part is most often used in mature production runs where firmware is fixed. When designing with this part, plan oscillator loading capacitor values to match the XT crystal specification (typically 15-33 pF) and ensure the MCLR reset circuit uses the correct pull-up topology. Designers migrating to modern Flash-based PICs should note that the PIC16C5X instruction set differs from later mid-range and enhanced mid-range PIC families, so code is not source-compatible.

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PIC16C56/JW - 8-bit 20MHz 1.5KB EPROM MCU | Microchip | CERDIP-18
PIC16C56/JW

PIC16C56/JW - 8-bit 20MHz 1.5KB EPROM MCU | Microchip | CERDIP-18

The Microchip Technology PIC16C56/JW is an 8-bit RISC EPROM-based microcontroller with 20 MHz maximum clock speed and 1.5 KB (1K x 12) of one-time-programmable/UV-erasable program memory, housed in a 18-pin ceramic DIP (CERDIP) windowed package. Key features include 25 bytes of RAM, 12 I/O pins, 8-bit timer/counter (TMR0), two-level hardware stack, 33 single-word/single-cycle instructions, and a wide operating voltage range that supports both 3.3 V and 5 V rails. The JW suffix denotes a windowed CERDIP package, allowing the EPROM to be erased with ultraviolet light and reprogrammed, which makes this part suitable for engineering development and prototyping rather than high-volume production. The PIC16C5X architecture is one of the original PIC microcontroller families, employing a Harvard-style RISC design with separate program and data buses, 12-bit wide instructions, and 8-bit wide data path. The device is fully static, allowing the clock to be stopped without losing internal state. This architecture predates the later PIC16F and PIC18 families but remains popular in legacy industrial controls, automotive subsystems, and education markets where long lifecycle support and known behavior are valued. Typical applications include simple logic replacement, motor and relay control, sensor signal conditioning, LED and seven-segment display driving, and battery-powered instruments. The low part count (no external program memory or data memory required) and inexpensive ceramic package make the PIC16C56/JW a fit for prototypes and small retrofit projects. When designing with this part, note that the windowed CERDIP package is significantly more expensive than the equivalent OTP plastic DIP variant (PIC16C56-04/P or PIC16C56-20/P). Reserve the JW version for development cycles where code revision is anticipated. Per the Microchip datasheet, all unused I/O pins should be configured as outputs to minimize current consumption. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical development notes not found in the manufacturer datasheet.

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PIC16C56A-04/P - 8-Bit 4MHz OTP MCU 1.5KB | Microchip
PIC16C56A-04/P

PIC16C56A-04/P - 8-Bit 4MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56A-04/P is an 8-bit CMOS RISC microcontroller from the PIC16C5X family operating at 4 MHz, integrating 1.5 KB (1K x 12) of One-Time Programmable (OTP) program memory, 25 bytes of data RAM, and 12 general-purpose I/O lines in an 18-pin PDIP through-hole package. The "04" speed suffix designates a 4 MHz oscillator input, while the "A" suffix marks the second-generation silicon revision that lowered power consumption and added enhancements over the original PIC16C56. The OTP program memory is programmed once with a device programmer such as the MPLAB PM3 and cannot be erased, making this part a fit for mature, low-cost, high-volume production. 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 belongs to the PIC (Peripheral Interface Controller) lineage and sits within the broader taxonomy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. The "RISC" architecture of the PIC16C5X uses only 33 single-word, single-cycle instructions, simplifying code generation and enabling deterministic instruction timing — a hallmark of PIC mid-range and baseline cores. Key differentiating specifications include: 33 single-word/single-cycle RISC instruction set, two-level deep hardware stack for subroutine nesting, one 8-bit real-time counter/timer (TMR0), Power-on Reset (POR), Watchdog Timer (WDT) with on-chip RC oscillator for reliable system recovery, and a wide 2.5 V to 6.25 V supply voltage range that allows battery and 5 V-rail designs. The OTP memory, four oscillator selections (RC, XT, HS, LP), and direct/indirect/relative addressing modes give designers flexibility in cost-optimized control loops. Typical applications span automotive body controllers, appliance controls, security keypads, simple sensor interfaces, low-end consumer products, and replacement of discrete logic with programmable intelligence. Because the PIC16C56A-04/P is offered in commercial and automotive grades, it is also used in under-hood and dashboard subsystems where OTP and known-good silicon are preferred over flash. A critical design consideration is that OTP parts cannot be reprogrammed in-circuit: firmware must be fully validated before programming. Engineers should plan for a programmer socket or a parallel-programmable strategy using the MPLAB PM3, and reserve the WDT for fail-safe recovery from code lockups. This page synthesizes verified distributor pricing, same-family and cross-brand drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet excerpt, helping procurement and embedded engineers evaluate the PIC16C56A-04/P against modern 8-bit replacements.

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PIC16C56A-04/SO - 4MHz 8-bit OTP MCU 1.5KB SOIC-18 | Microchip
PIC16C56A-04/SO

PIC16C56A-04/SO - 4MHz 8-bit OTP MCU 1.5KB SOIC-18 | Microchip

The Microchip Technology PIC16C56A-04/SO is an 8-bit CMOS ROM-based microcontroller from the PIC16C5x family, delivering up to 4 MHz operating frequency with 1.5 KB of One-Time-Programmable (OTP) program memory and 25 bytes of RAM, packaged in an 18-pin SOIC (SO) wide-body SMD package. It exposes 12 digital I/O lines and integrates a 12-bit instruction set that achieves 2:1 code compression over competing 8-bit MCUs in the same price class. The device is fabricated in CMOS technology and is intended for low-cost, high-volume embedded control where deterministic behavior and small code footprint matter more than peripherals. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, working RAM, and programmable I/O. The PIC16C5x architecture belongs to the original baseline PIC family, sitting in the hierarchy MCU -> 8-bit microcontroller -> embedded controller -> semiconductor. Baseline PIC cores use a Harvard architecture with separate program and data paths, RISC-like instruction set, and a hardware call/return stack. The 'A' revision in PIC16C56A adds lower power consumption and improved oscillator stability versus the original PIC16C56, while keeping the same 18-pin pinout and instruction set for source compatibility. Key features of the PIC16C56A-04/SO include: 1.5 KB OTP program memory (1K x 12), 25 bytes of RAM, 12 I/O pins, an 8-bit timer/counter (TMR0) with an 8-bit prescaler, watchdog timer with on-chip RC oscillator, power-on reset, power-saving SLEEP mode, and an internal/external oscillator option. The 04 speed grade specifies 4 MHz maximum clock. The wide SOIC-18 package supports surface-mount assembly on consumer and industrial PCBs. Technical depth: the PIC16C56A uses a 12-bit instruction word and a two-stage pipeline. With a 4 MHz oscillator the instruction cycle is 1 microsecond (4 Tosc). All 12 I/O pins can source/sink typical CMOS levels and individually trigger wake-up from SLEEP on pin change. The on-chip watchdog runs from a dedicated internal RC oscillator independent of the system clock, so it remains active even in SLEEP mode for failsafe recovery. Typical applications include consumer appliance control, small white-goods motor/relay drivers, low-end remote-control transmitters, LED display drivers, simple sensor signal conditioning, and replacement of discrete logic in cost-sensitive embedded products. Designers choose this part when OTP (one-time-programmable) cost is acceptable and the firmware is locked at production. When designing with this device, budget OTP programming time and tooling into the production flow; PIC16C5x OTP parts are programmed by Microchip-approved gang programmers. Ensure the oscillator selection matches the operating environment (XT, HS, LP, RC modes), and respect the 5.5 V absolute-maximum VDD rating. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes - including a same-package cross-reference matrix and recommended companion parts - not assembled on the manufacturer datasheet or single distributor pages.

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PIC16C56A-04E/P - 1.5KB OTP 8-bit MCU, 4MHz, Ext Temp | Microchip
PIC16C56A-04E/P

PIC16C56A-04E/P - 1.5KB OTP 8-bit MCU, 4MHz, Ext Temp | Microchip

The Microchip Technology PIC16C56A-04E/P is an 8-bit CMOS RISC microcontroller in the PIC16C5X family, offered in a 18-pin PDIP through-hole package. It integrates 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, 12 digital I/O lines and a 4MHz internal/external oscillator. The "04E" suffix designates the 4MHz speed grade and the extended (-40C to +125C) automotive temperature range, while "/P" identifies the PDIP-18 package. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM and peripheral I/O. The PIC16C5X series belongs to the original baseline PIC architecture using 12-bit wide instructions and a RISC instruction set of only 33 single-word, single-cycle opcodes. Within the broader taxonomy, this part is a 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. Its baseline RISC architecture makes it well suited to deterministic, low-cost control loops rather than to high-throughput digital signal processing. Key features of the PIC16C56A-04E/P include 1.5KB OTP program memory (one-time field-programmable, ideal for mature/production code), 25 bytes of RAM, a 4MHz maximum operating frequency giving 1us instruction cycle, 12 bidirectional I/O pins, an 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, watchdog timer with on-chip RC oscillator, Power-on Reset, and brown-out detection. The device is built on a fully static CMOS process, allowing clock frequencies down to DC. Power-saving SLEEP mode and a wide 2.5V-5.5V operating range simplify battery and industrial 5V designs. Typical applications include automotive body controllers, HVAC damper control, appliance front panels, simple sensor interfaces, white-goods motor control, security alarm keypads, and low-cost replacement of 555-timer-based discrete logic. The extended temperature grade (-40C to +125C) allows under-hood deployment. When designing with this device, remember that OTP parts cannot be reprogrammed in-circuit; an EPROM windowed version (PIC16C56A-04/JW) is required for prototype development. For higher-volume or flash-based designs consider the pin-compatible PIC16F54 family.

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PIC16C56A-04E/SS - 1KB OTP 8-bit MCU, 4MHz, SSOP-20 | Microchip
PIC16C56A-04E/SS

PIC16C56A-04E/SS - 1KB OTP 8-bit MCU, 4MHz, SSOP-20 | Microchip

The Microchip PIC16C56A-04E/SS is a 1.5KB (1K x 12) one-time-programmable (OTP) 8-bit RISC microcontroller in the PIC16C5X family, housed in a 20-pin SSOP (Shrink Small Outline) package rated for the -40C to +125C extended automotive temperature grade. It runs at up to 4MHz clock speed from a 3V to 5.5V supply, delivers 12 I/O lines, and integrates a Power-On Reset (POR), Watchdog Timer (WDT), and a programmable timer/counter on-chip. An OTP EPROM-based microcontroller is a one-time-programmable 8-bit MCU whose program memory is implemented in EPROM cells; once blown, the code cannot be electrically erased, which is why OTP parts are designed for low-to-medium volume production where mask-ROM NRE costs are not justified. Within the broader silicon taxonomy, OTP MCUs sit under the family of EPROM/ROM-based microcontrollers, which themselves fall under 8-bit microcontrollers, then microcontrollers (MCU), and finally the integrated circuits (IC) category. The PIC16C5X family is Microchip's baseline low-cost, high-performance RISC architecture family, delivering 33 single-word, single-cycle instructions (branches take two cycles) and 2:1 code compression versus other 8-bit MCUs in its class. The 04 speed grade denotes a 4MHz oscillator maximum, and the E suffix designates the extended -40C to +125C operating temperature range suitable for industrial and automotive under-hood applications. The SS package indicates a 20-pin Shrink Small Outline (SSOP, 0.209 inch / 5.30mm body width) gull-wing surface-mount outline. With twelve I/O lines and the low pin count, this device targets cost-sensitive embedded control such as appliance controllers, sensor interfaces, LED drivers, and automotive body controllers where extended-temperature reliability is required. Architecturally, the PIC16C56A uses a Harvard-style separated program/data bus with a 12-bit program word and an 8-bit data path. The OTP memory of 1024 12-bit words gives roughly 1.5KB of code space, and the integrated peripherals - POR, WDT, and one 8-bit timer - are sufficient for simple state-machine and timing control loops. Because the part is OTP rather than Flash, it cannot be reprogrammed in-circuit; production programming requires a device programmer such as the MPLAB PM3 universal device programmer. Typical applications include automotive body and chassis sub-assemblies (such as mirror controllers, seat switches, and simple sensor conditioning nodes), industrial appliance control (washing-machine sub-controllers, HVAC damper drivers), and cost-sensitive consumer electronics (remote controls, LED signage controllers, and small toys). The wide 3V to 5.5V range also allows direct operation from a regulated 5V rail or two alkaline cells. When designing with this part, remember that OTP is one-time programmable - firmware bugs cannot be fixed after programming without re-rolling a new silicon lot, so pre-production verification on the pin-compatible PIC16F56 Flash version is recommended. Decoupling must include a 100nF ceramic capacitor between VDD and VSS placed within 5mm of the package, and unused I/O pins should be configured as outputs to minimize current consumption. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes not found in the manufacturer datasheet - giving engineers a faster, side-by-side comparison for the PIC16C56A-04E/SS and its closest SSOP-20 substitutes in the PIC16C5X family and competitor portfolios.

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