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PIC16C55T-XT/SO - 8-bit OTP MCU, 768B EPROM, 20 I/O SOIC-28 | Microchip
PIC16C55T-XT/SO

PIC16C55T-XT/SO - 8-bit OTP MCU, 768B EPROM, 20 I/O SOIC-28 | Microchip

The Microchip PIC16C55T-XT/SO is a member of the PIC16C5X family of low-cost, high-performance 8-bit fully-static EPROM/ROM-based CMOS microcontrollers, packaged in a 28-pin SOIC ("/SO") wide-body surface-mount package. It delivers 0.75 KB (768 bytes) of program EPROM, 24 bytes of data RAM, and 20 digital I/O pins organized into three I/O ports (RA, RB, RC), driven by a RISC-style instruction set with only 33 single-word / 12-bit instructions and a 2:1 code compression advantage over typical 8-bit CISC competitors in its class. The "XT" suffix indicates a high-frequency external crystal/oscillator option up to 4 MHz; the device operates from 2.5 V to 6.25 V and is rated for the commercial 0 C to +70 C temperature range, with the "T" suffix denoting the tape-and-reel packaging variant. A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and peripheral I/O. Within the product hierarchy, the PIC16C5X belongs to the 8-bit MCU -> microcontroller -> embedded controller -> semiconductor family. The PIC16C5X series in particular is Microchip's original "baseline" OTP/EPROM-based MCU architecture, designed for cost-sensitive, low-to-medium complexity embedded applications where flash reprogrammability is not required, making it well-suited for high-volume consumer and industrial products. Key features include Harvard-architecture separate program and data buses, a 12-bit instruction word, a 2-level hardware stack, an 8-bit timer/counter with optional programmable prescaler, power-on reset, watchdog timer with on-chip RC oscillator, code-protection EPROM security, and CMOS technology for very low power consumption (typically < 2 mA at 5 V/4 MHz and < 20 uA in standby). The 20-mA sink/source per-pin capability (max 25 mA per pin) on the 20 I/O pins directly drives LEDs and small relays. Typical applications include remote-control transmitters, security-system sensor interfaces, appliance controllers (microwave, washing machine, thermostat), consumer-electronics toys, simple battery chargers, smoke detectors, automotive interior accessories (non-safety), and any high-volume appliance where the OTP memory's one-time-programmable cost advantage outweighs the need for in-system reprogramming. The wide SOIC-28 footprint simplifies hand-soldering and rework compared to shrink-SOIC packages. When designing with this part, verify that the OTP program memory will be burned before PCB assembly - field updates are not possible. Ensure the VDD rise time stays below the POR-specification ramp; if a slow-rising supply is unavoidable, use a power-on-reset supervisor. Decouple VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the pin, and connect the OSC1/OSC2 crystal traces in short, ground-guarded paths.

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PIC16C55T-XT/SS - 8-bit 4MHz OTP MCU 768B | 28-SSOP
PIC16C55T-XT/SS

PIC16C55T-XT/SS - 8-bit 4MHz OTP MCU 768B | 28-SSOP

The Microchip Technology PIC16C55T-XT/SS is an 8-bit RISC microcontroller from the PIC16C5X family, delivering 4 MHz maximum clock speed and featuring 768 bytes of OTP program memory organized as 512 x 12 words, in a 28-pin SSOP surface-mount package. The integrated 24-byte data RAM and 20 general-purpose I/O pins make this CMOS MCU suitable for compact embedded control tasks in industrial and consumer electronics. An 8-bit OTP microcontroller is a single-chip microcomputer containing a CPU, program memory, data RAM, and peripheral I/O on one die. The OTP (One-Time Programmable) memory uses fuse/antifuse or EPROM cells that can be written once with a device programmer but cannot be electrically erased; this gives PIC16C5X parts a low-cost, low-power profile suited to high-volume production where firmware is finalized. The PIC16C5X family implements a RISC architecture with only 33 single-word/single-cycle instructions, allowing most instructions to execute in one clock cycle for deterministic throughput at low MHz. Key specifications include 4 MHz maximum operating frequency, 768 bytes (512 x 12) OTP program memory, 24 bytes of RAM, 20 I/O pins, and a 3.0V to 6.25V supply voltage range. The device uses an external XT oscillator (crystal/resonator up to 4 MHz) and operates over the commercial 0°C to 70°C temperature range. The 28-SSOP (5.30 mm width, 0.65 mm pitch) package enables high-density board layouts while remaining hand-solderable for prototype builds. The PIC16C55 architecture employs a Harvard-style separate program/data bus, with a 12-bit-wide instruction word. Peripherals include a watchdog timer, power-on reset, and a 8-bit timer/counter with optional prescaler. The 20 I/O pins support TTL/CMOS levels, with individual pin direction control. Compared to its PIC16C54 sibling, the PIC16C55 offers larger program memory (768 B vs 512 B) for applications requiring additional lookup tables or state machines. Typical applications include industrial control, appliance control, low-cost remote-control encoders, LED driver controllers, and consumer electronic toys. The wide 3.0V to 6.25V supply range and external XT oscillator support standard 4 MHz crystals used across the embedded market. When designing with this part, ensure that firmware is finalized before programming because the OTP memory cannot be re-programmed in-circuit. For development and field updates, use a Flash-based PIC16F5X variant (e.g., PIC16F57) as a development substitute on the same SSOP footprint.

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PIC16C55T-XTE/SS - 8-bit OTP MCU, 4MHz, 28-SSOP | Microchip
PIC16C55T-XTE/SS

PIC16C55T-XTE/SS - 8-bit OTP MCU, 4MHz, 28-SSOP | Microchip

The Microchip Technology PIC16C55T-XTE/SS is an 8-bit EPROM/ROM-based CMOS microcontroller delivering 4 MHz CPU performance with 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory and 24 bytes of data RAM, housed in a 28-pin SSOP package. It operates from a 3.3V to 5.5V supply and features 20 general-purpose I/O pins, making it a compact solution for cost-sensitive embedded designs. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, data RAM, and integrated peripherals such as timers and I/O. Within the broader taxonomy, the PIC16C55 sits as: 8-bit microcontroller -> RISC microcontroller -> microcontroller -> embedded IC -> semiconductor. The PIC16C5X family specifically targets low-cost, high-volume applications where deterministic instruction execution and minimal external component count are valued over raw processing power. Key features include 33 single-word instructions, a 12-bit instruction word width yielding 2:1 code compression versus competing 8-bit architectures, a Power-on Reset (POR), a Watchdog Timer (WDT) for reliable operation, and an 8-bit real-time timer/counter. The OTP program memory is one-time programmable, suitable for volume production where firmware is finalized and code updates are not expected in the field. Architecturally, the PIC16C55 uses a Harvard-style RISC core with separate program and data buses, enabling most instructions to execute in a single instruction cycle (250 ns at 4 MHz). The CMOS process delivers low power consumption suitable for both battery-powered and line-powered equipment. The 28-SSOP footprint offers a compact 5.30 mm body width, ideal for space-constrained PCB layouts. Typical applications include consumer appliance control, simple sensor interfaces, LED display drivers, low-end remote controls, and industrial timers where the combination of low cost, deterministic timing, and Microchip's mature toolchain (MPLAB) provides a fast time-to-market. The 4 MHz clock speed is sufficient for slow human-interface tasks but not for high-speed communication protocols. When designing with this part, note that the PIC16C55 is an older EPROM-based architecture with no in-circuit debug capability. Designers should plan for a socketed programming adapter during development and verify the OTP write window with the chosen programmer. The 28-SSOP package requires careful thermal profile control during reflow soldering. This page synthesizes distributor pricing, drop-in SSOP-package alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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PIC16C55T-XTI/SS - 8-Bit 4MHz OTP MCU 768B | Microchip
PIC16C55T-XTI/SS

PIC16C55T-XTI/SS - 8-Bit 4MHz OTP MCU 768B | Microchip

The Microchip Technology PIC16C55T-XTI/SS is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory, 24 bytes of RAM, and 20 general-purpose I/O pins. It operates at a maximum clock frequency of 4 MHz across a 5V supply in a 28-pin SSOP package (0.209 inch, 5.30 mm width). The 'T' suffix denotes tape-and-reel packaging, 'XT' denotes the 4 MHz oscillator variant, and 'I' indicates the industrial operating temperature range. An 8-bit microcontroller is a single-chip computer that integrates a CPU, memory (ROM/RAM), and I/O peripherals on one die. The PIC architecture specifically uses a RISC (Reduced Instruction Set Computer) design with only 33 single-word, single-cycle instructions, enabling predictable deterministic execution. 8-bit MCUs sit within the broader hierarchy: microcontroller -> embedded processor -> semiconductor, serving as the workhorse for cost-sensitive embedded control tasks where compute demands are modest. Key features include a fully static CMOS design (allowing the clock to be stopped for power saving), 12-bit wide instruction word, 8-bit data path, two hardware timers/counters (8-bit and 16-bit equivalent), watchdog timer with on-chip RC oscillator, power-on reset, and brown-out detection. The 20 I/O pins each source or sink up to 25 mA, enabling direct LED drive without external drivers. Technical depth: the PIC16C5X uses a Harvard architecture with separate instruction and data buses. The 12-bit instruction word is wider than the 8-bit data path, allowing every instruction to be a single 12-bit word accessed in one cycle. OTP memory is field-programmable but not erasable, making the device cost-optimized for volume production of stable firmware. Typical applications include consumer appliance control, HVAC thermostat logic, simple sensor signal conditioning, remote control transmitters, battery chargers, and industrial timing controllers. The wide I/O drive strength makes it suitable for relay and LED matrix drivers directly off the chip. Design consideration: when migrating to this part, verify oscillator type matches XT crystal/ceramic resonator specifications (typically 4 MHz fundamental). For in-circuit programming or firmware upgrades during development, prefer a Flash-based PIC16F equivalent. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, providing engineers with a single authoritative reference.

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PIC16C56-10E/SO - 8-Bit 10MHz OTP MCU, 1.5KB | Microchip
PIC16C56-10E/SO

PIC16C56-10E/SO - 8-Bit 10MHz OTP MCU, 1.5KB | Microchip

The Microchip Technology PIC16C56-10E/SO is a member of the PIC16C5X family of low-cost, high-performance, 8-bit, fully static, EPROM/ROM-based CMOS microcontrollers. The device integrates 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, operates at a maximum clock speed of 10MHz, and is housed in an 18-pin SOIC package (0.295 inch / 7.50mm body width) rated for the extended automotive temperature grade. An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, non-volatile program memory, volatile data memory, and configurable I/O peripherals on one die. The PIC16C5X family belongs to the broader hierarchy of microcontrollers -> embedded controllers -> semiconductor devices, and serves as the entry-level tier of the Microchip PIC16C lineage. The '16C' suffix denotes CMOS EPROM/OTP process technology, while the '5X' sub-family groups devices with 12-bit-wide instruction words optimized for code density. This combination delivers 2:1 code compression over competing 8-bit MCUs in the same price class, per the family description. Key features of the PIC16C56-10E/SO include 25 bytes of general-purpose RAM, a 12-bit instruction word, a single 8-bit timer/counter, a watchdog timer with on-chip RC oscillator, power-saving Sleep mode, and 12 I/O pins with individual direction control. The '10' suffix indicates a 10MHz maximum oscillator frequency, and the 'E' suffix denotes the extended automotive temperature range (-40C to +125C). The device is supported by the MPLAB PM3 Universal Device Programmer and the MPLAB IDE toolchain. Architecturally, the PIC16C56 uses a RISC instruction set with only 33 single-word/single-cycle instructions, a two-stage pipeline, and Harvard bus architecture separating program and data paths. The OTP program memory cannot be erased, making this part suited for low-to-medium-volume production where in-system re-programmability is not required. Engineers migrating to flash-based equivalents typically use the PIC16F506 in the same 14-pin or 18-pin SOIC footprint. Typical applications include appliance control, automotive body electronics (within the -40C to +125C window), sensor signal conditioning, LED drivers, low-cost remote controls, and battery-powered embedded subsystems. The wide operating voltage range of 2.5V to 6.0V and ultra-low Sleep current make it a strong fit for power-constrained designs. When designing with the PIC16C56-10E/SO, note that OTP memory is one-time programmable - firmware bugs cannot be fixed in the field. For prototyping or field-updatable designs, choose the PIC16F506 flash variant instead. The 18-SOIC package follows JEDEC MS-013 outline and reflow-solders at standard 245C peak profiles. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, enabling faster BOM decisions.

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PIC16C56-10E/SS - 8-bit 10MHz OTP MCU 1.5KB | Microchip
PIC16C56-10E/SS

PIC16C56-10E/SS - 8-bit 10MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56-10E/SS is an 8-bit RISC microcontroller from the PIC® 16C family operating at a 10 MHz core clock speed, packaged in a 20-pin SSOP (Shrink Small Outline Package). It integrates 1.5 KB of OTP (One-Time Programmable) program memory organized as 1K x 12 bits, 25 bytes of data RAM, and 12 general-purpose digital I/O pins. The -10E suffix indicates the 10 MHz speed grade with the Extended (E) temperature range, making it suitable for automotive and industrial environments where operating temperatures extend beyond the commercial window. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and programmable I/O peripherals on one silicon die. Within the broader taxonomy, the PIC16C56 belongs to the PIC16C family of classic OTP-based 8-bit MCUs, which sits beneath mid-range microcontrollers, microcontrollers, embedded processors, and finally semiconductors. The 16C line was Microchip's original OTP mid-range family, predecessor to today's flash-based PIC16F series, and remains in production for long-lifecycle and cost-sensitive applications where re-programmability is not required. Key features of the PIC16C56-10E/SS include a Harvard RISC architecture with 33 single-word instructions, a 12-bit instruction word for 2:1 code compression over typical 8-bit MCUs, power-on reset (POR), brown-out detection, watchdog timer (WDT) with on-chip RC oscillator, and an operating voltage range typically of 3.0 V to 6.0 V. The 12-bit instruction width enables compact code density, reducing program-memory consumption for small embedded tasks. Typical applications include automotive body controllers, sensor interface nodes, low-end remote controls, simple appliance controls, battery-powered instrumentation, and industrial logic replacements. Because the device uses OTP memory, it is intended for high-volume, fixed-function products rather than development or field-upgradable firmware. When designing with this part, verify that the OTP-programmed image is final before mask production; in-circuit reprogramming is not possible. Consider the modern flash-based PIC16F counterpart for prototyping, then migrate to the PIC16C56 once the firmware is frozen. This page synthesizes distributor pricing for PIC16C56-10E/SS, Microchip same-family drop-in alternatives, cross-brand pin-compatible PIC16C5x references, application examples, and design notes that go beyond the data sheet abstract.

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PIC16C56-10I/SO - 8-bit CMOS MCU, 1KB EPROM, 10MHz | Microchip
PIC16C56-10I/SO

PIC16C56-10I/SO - 8-bit CMOS MCU, 1KB EPROM, 10MHz | Microchip

The Microchip PIC16C56-10I/SO is a member of the PIC16C5X family of low-cost, high-performance 8-bit fully-static EPROM-based CMOS microcontrollers. It integrates a 12-bit-wide instruction word, an 8-bit-wide data path, 1KB of EPROM program memory, 25 bytes of RAM, and 12 I/O pins in an 18-pin SOIC wide-body package. The device operates from a single 5V supply and supports a maximum clock frequency of 10 MHz with the -10 speed grade, delivering approximately 5 MIPS of instruction throughput. What is a PIC16C5X microcontroller? The PIC16C5X is Microchip's foundational mid-range 8-bit RISC microcontroller family, sitting within the broader PIC16 family -> PIC microcontroller -> 8-bit MCU -> microcontroller (MCU) -> embedded processor hierarchy. These devices feature a Harvard architecture with separate program and data buses, a small two-level hardware stack, and direct/indirect/relative addressing modes. They are EPROM (one-time-programmable) based, designed for cost-sensitive high-volume applications where flash reprogrammability is not required. Key specifications include seven or eight special-function hardware registers, a two-level-deep hardware stack, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, and a watchdog timer for reliable unattended operation. The device offers industrial temperature range operation (-40C to +85C, indicated by the 'I' suffix) and is housed in a 300-mil wide-body SOIC-18 (SO) package suitable for surface-mount assembly. Architecturally, the PIC16C56-10I/SO uses CMOS technology for low power consumption, supports power-saving SLEEP mode, and includes a programmable code-protection bit. Its RISC instruction set consists of 33 single-word single-cycle instructions, achieving 2:1 code compression over comparable 8-bit CISC microcontrollers and reducing overall program memory footprint. Typical applications include appliance controls, automotive sensor interfaces (sub-systems), LED lighting controllers, security-system keypad scanners, and remote-control transmitters. The -10I variant with industrial temperature grade and SOIC packaging is well suited for harsh-environment commercial and industrial embedded designs. A key design consideration is that the PIC16C5X family uses EPROM (not Flash), so firmware must be committed before final packaging. The /RESET and oscillator pins require careful PCB layout, and decoupling capacitors must be placed close to VDD/VSS to suppress switching noise. This page synthesizes distributor inventory, lifecycle status, drop-in same-family alternatives, and practical design notes not consolidated on the manufacturer product page.

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PIC16C56-10I/SS - 8-bit CMOS MCU, 1.5KB, 12 I/O, SSOP-20 | Microchip
PIC16C56-10I/SS

PIC16C56-10I/SS - 8-bit CMOS MCU, 1.5KB, 12 I/O, SSOP-20 | Microchip

The Microchip Technology PIC16C56-10I/SS is an 8-bit RISC CMOS microcontroller from the PIC16C5X baseline family, offering 1.5 KB of one-time programmable (OTP) program memory, 25 bytes of RAM, and 12 bidirectional I/O pins in a 20-pin SSOP (Shrink Small Outline Package). The "-10" suffix denotes a 10 MHz maximum clock input, which combined with the 200 ns single-cycle instruction execution delivers up to 5 MIPS of throughput, while the "I" temperature grade specifies an industrial -40C to +85C operating range. A baseline PIC microcontroller is an 8-bit RISC MCU built around a small, fixed instruction set (typically 33 single-word instructions) and a two-stage pipeline. Within the broader taxonomy, a PIC16C5X sits between simpler PIC10/PIC12 devices and the mid-range PIC16F1 family, sharing the foundational Harvard architecture (separate program and data buses) but predating the flash-based mid-range parts. Engineers choose this class for cost-sensitive, deterministic control loops where the OTP memory and limited peripherals are acceptable trade-offs. Key features include an 8-bit timer/counter (TMR0) with an 8-bit prescaler, a two-level deep hardware stack for subroutines, direct/indirect/relative addressing modes, and a high-performance RISC CPU supporting all single-cycle instructions except program branches, which require two cycles. Power consumption is reduced through CMOS fabrication, and the device supports a wide 2.5V to 6.0V VDD range for flexible system integration. The PIC16C56-10I/SS uses a Harvard architecture with a 12-bit program memory bus and an 8-bit data path, giving roughly 2:1 code compression versus competitive 8-bit MCUs in its price class. The OTP EPROM program memory requires a one-time programming step with an MPLAB-compatible device programmer such as the MPLAB PM3, and the part is suited to mature, stable code that does not need in-field firmware updates. Typical applications include simple consumer appliances, sensor interface controllers, LED driving boards, replacement of discrete logic, low-end remote controls, and industrial timing modules. The SSOP-20 footprint is also friendly to space-constrained PCB designs. When designing with the PIC16C56-10I/SS, verify that the MCLR, OSC1/OSC2, and VDD/VSS pin assignments match the chosen clock topology (RC, XT, LP, or HS oscillator). For automotive or extended-temperature requirements, source a part with an "E" temperature grade and confirm the latest Microchip product change notifications, since PIC16C OTP parts have undergone lifecycle transitions as flash-based baselines replaced them. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping sourcing engineers and PCB designers make a faster, more confident decision.

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PIC16C56-HS/P - 8-bit 20MHz OTP MCU, 1.5KB, PDIP-18 | Microchip
PIC16C56-HS/P

PIC16C56-HS/P - 8-bit 20MHz OTP MCU, 1.5KB, PDIP-18 | Microchip

The Microchip Technology PIC16C56-HS/P is an 8-bit EPROM/ROM-based CMOS microcontroller (MCU) from the PIC16C5x family, supplied in a through-hole 18-pin PDIP package. It integrates 1.5KB (1K x 12) of One-Time-Programmable (OTP) program memory, 25 bytes of RAM, and 12 digital I/O pins, and executes instructions at a maximum clock speed of 20 MHz using the high-speed ('HS') oscillator mode. The PIC16C5x core uses a RISC architecture with 33 single-word, single-cycle instructions, providing 2:1 code compression over competing 8-bit MCUs in its class. What is an 8-bit OTP microcontroller? An OTP microcontroller is a single-chip computer that integrates a CPU, RAM, ROM/EPROM (program memory), and peripherals on one die. The 'OTP' suffix means the on-chip program memory can be written once by the user with a device programmer (typically using EPROM cells) and cannot be electrically erased afterward, making OTP MCUs the lowest-cost option for moderate-volume production. 8-bit OTP MCUs sit at the lowest tier of the microcontroller hierarchy: microcontroller -> embedded controller -> semiconductor -> integrated circuit. They are widely used in cost-sensitive, low-power, deterministic-control applications such as consumer appliances, sensors, and simple timing/logic-replacement roles. Key features of the PIC16C56-HS/P include a 12-bit instruction word with 8-bit data path, two-level deep hardware stack, direct/indirect/relative addressing for data and code, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, and a watchdog timer for unattended operation. The HS oscillator mode supports high-frequency crystal or resonator operation up to 20 MHz, while the wide 3.0V-5.5V supply range allows operation from a single Li-cell or regulated 5V rail. Compared with other PIC16C5x variants, the 'C56' is the OTP-programmable member and the 'HS' designator specifies the high-speed oscillator option rather than the low-power ('LP') or resistor/capacitor ('RC') modes. Architecturally, the PIC16C56-HS/P uses a Harvard-style memory map with separate program and data buses, allowing instruction fetch and operand access in the same cycle. Its 12-bit-wide instruction set, fixed-format 33-instruction core, and deterministic 4-clock (200 ns at 20 MHz) instruction cycle make code execution timing fully predictable, which simplifies real-time control loops. Because the program memory is EPROM-based and the part is in PDIP, it is intended for development, prototyping, and low-to-moderate-volume production where windowed ceramic or reprogrammable Flash devices are not required. Typical applications include appliance controllers, sensor signal conditioning front-ends, simple PWM/fan controllers, LED lighting drivers, security keypads, and any battery-powered device that needs deterministic 8-bit control with low active current. Because the package is through-hole PDIP-18 and the device is mature, the part is also frequently used for legacy board repair and educational/learning platforms. Microchip marks the broader PIC16C56 family as 'Not Recommended for new designs' (NRND), so new designs should normally target the Flash-based PIC16F or enhanced PIC16C5x successors. When designing with this part, ensure the selected crystal or resonator matches the HS oscillator's load-capacitance specification, place decoupling capacitors (typically 0.1 uF) close to VDD/VSS pins, and reserve the MCLR pin for a proper reset circuit. Because the program memory is OTP, firmware must be fully validated in windowed or emulation parts before committing to PIC16C56-HS/P production programming. This page synthesizes current distributor pricing, drop-in PDIP-18 alternatives, and practical design notes that go beyond the manufacturer datasheet summary.

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PIC16C56-HS/SS - 8-Bit 20MHz CMOS MCU, 1KB EPROM | Microchip
PIC16C56-HS/SS

PIC16C56-HS/SS - 8-Bit 20MHz CMOS MCU, 1KB EPROM | Microchip

The Microchip Technology PIC16C56-HS/SS is an 8-bit, fully static, EPROM/ROM-based CMOS microcontroller from the PIC16C5X family, housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm pitch. The HS suffix indicates the high-speed oscillator variant rated for a 20 MHz maximum clock frequency, while the SS suffix designates the SSOP package. The device integrates 1024 words of EPROM program memory (12-bit instruction width), 25 bytes of data RAM, and 12 bidirectional I/O lines, making it suitable for compact embedded control designs. An 8-bit RISC microcontroller (Reduced Instruction Set Computer) is a microprocessor that executes one instruction per clock cycle from a small, fixed-format instruction set. The PIC16C5X architecture is a foundational RISC MCU line from Microchip, offering 33 single-word single-cycle instructions, a two-level deep hardware stack, and direct, indirect, and relative addressing modes. Microcontrollers in this class are widely used as embedded controllers, sensor interface chips, and low-cost logic replacements in industrial and consumer products. The PIC16C56-HS/SS delivers up to 20 MHz CPU execution, eight-bit timer/counter (TMR0) with an 8-bit prescaler, Power-On Reset (POR), Watchdog Timer (WDT) with its own on-chip RC oscillator, and an operating voltage range of 4.5V to 5.5V. The 12-bit wide instructions produce a typical 2:1 code compression versus competitive 8-bit MCUs, and the device consumes less than 2 mA at 5V/4 MHz typical, with standby current under 4 uA. These specifications place it in the classic low-cost embedded controller category. Typical applications include appliance control, sensor signal conditioning, LED and relay drivers, automotive body electronics (pre-CAN modules), battery chargers, and simple human-machine interface (HMI) panels. Its low pin count and small SSOP footprint allow integration into space-constrained PCBAs where a few dozen I/O toggles suffice. A critical design consideration with EPROM-based PIC16C5X parts is that they require a quartz windowed package (JW) or one-time-programmable (OTP) programming, and they cannot be reprogrammed in-circuit without erasing via UV. Engineers migrating to flash memory should consider the pin-compatible PIC16F54 or PIC16F57 families. The PIC16C56 is now a mature, mature-lifecycle product; verify last-time-buy status before designing it into new platforms. This page synthesizes distributor pricing, drop-in SSOP-20 alternatives, parametric comparisons, and practical design notes that go beyond the raw manufacturer datasheet to help procurement, design, and reliability engineers evaluate the PIC16C56-HS/SS for both legacy maintenance and new low-cost 8-bit MCU designs.

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PIC16C56-HSE/P - 8-bit PIC MCU, 1.5KB OTP, 16MHz, 18-PDIP | Microchip
PIC16C56-HSE/P

PIC16C56-HSE/P - 8-bit PIC MCU, 1.5KB OTP, 16MHz, 18-PDIP | Microchip

The Microchip Technology PIC16C56-HSE/P is an 8-bit RISC PICmicro microcontroller in the PIC16C5x OTP (one-time-programmable) family, featuring 1.5KB (1K x 12) of program memory, 25 bytes of RAM, and a 16MHz maximum operating frequency, housed in an 18-pin PDIP (0.300 inch, 7.62 mm) through-hole package. The HSE suffix indicates the high-speed 16MHz resonator/crystal oscillator mode, while the /P suffix designates the plastic DIP package variant. A PIC16C5x microcontroller is a member of the original Microchip PIC family of 8-bit Harvard-architecture microcontrollers. The 12-bit-wide instruction set delivers highly symmetrical 2:1 code compression versus other 8-bit microcontrollers in its class. PIC16C5x devices integrate the CPU, program memory, RAM, and peripherals onto a single CMOS die, making them drop-in controllers for cost-sensitive embedded applications that do not require in-system reprogrammability. Key features include 12 digital I/O pins, a Watchdog Timer (WDT) for unattended operation, and a Power-On Reset (POR) circuit that holds the device in reset until VDD reaches a valid level. The device operates from a 5V supply across the commercial 0C to +70C range (HSE operating range). With a 16MHz oscillator and a 4-cycle instruction clock, each instruction executes in 250ns, providing deterministic real-time control suitable for state machines, simple sensor interfaces, and consumer appliances. Architecturally, the PIC16C5x uses a two-stage pipeline with separate program and data buses (Harvard architecture). The 12-bit program counter addresses up to 2K instructions, and the 7-bit file-select register provides 128 bytes of register/SRAM address space (only 25 bytes general-purpose). The ALU is 8 bits wide and operates directly on any register, simplifying C and assembly coding. Typical applications include low-cost consumer appliances, automotive body electronics (non-safety), security keypads, simple LED/LCD drivers, and replacement of discrete logic in legacy designs. Industrial users also deploy PIC16C5x for hard-coded protocol converters and appliance timer modules where OTP cost is preferred over flash reprogrammability. When designing with this device, note that OTP memory cannot be erased or rewritten; firmware must be 100 percent verified before programming. A 10kohm pull-up on MCLR is recommended unless the internal POR is used, and decoupling caps (0.1uF plus 10-47uF bulk) must be placed close to VDD and VSS pins to suppress oscillator noise. This page synthesizes distributor pricing, drop-in alternatives within the PIC16C5x family, and practical design notes not consolidated in any single manufacturer datasheet.

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PIC16C56-HSE/SS - 8-Bit 16MHz OTP MCU 1.5KB | Microchip
PIC16C56-HSE/SS

PIC16C56-HSE/SS - 8-Bit 16MHz OTP MCU 1.5KB | Microchip

The Microchip Technology PIC16C56-HSE/SS is an 8-bit PIC16C-series CMOS microcontroller based on One-Time Programmable (OTP) EPROM technology, offering 1.5KB (1K x 12) of program memory and 25 bytes of data RAM in a 20-pin SSOP package. It operates at a maximum clock speed of 16MHz from a supply voltage range of 3.0V to 5.5V, with the "HSE" suffix denoting a high-speed 16MHz crystal/ceramic resonator oscillator option. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data bus and a Harvard architecture, integrating a CPU, program memory, working RAM, and basic peripherals. PIC microcontrollers sit in the broader hierarchy: 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. They are commonly used in cost-sensitive embedded designs where deterministic instruction execution and a small footprint are more important than raw compute throughput. Key features of the PIC16C56 include 12-bit-wide instructions for 2:1 code compression over competitive 8-bit cores, a fully static design that allows clock stopping, on-chip Power-On Reset (POR), a Watchdog Timer (WDT) for code-flow recovery, and 12 dedicated I/O pins arranged across ports A and B. Its 20-bit instruction word with 12-bit opcode keeps firmware compact for the 1K-word program-memory address space. The device uses a RISC-style instruction set of 33 single-word/single-cycle instructions, executing most instructions in a single 4-clock instruction cycle (200ns at 20MHz max). The architecture supports interrupt-driven designs with optional peripheral features selectable at programming time. Industrial- and consumer-grade temperature grades are available, and the OTP cell is field-programmable using standard EPROM programmers. Typical applications include low-cost consumer appliances, remote-control transmitters, sensor-interface front ends, LED display controllers, battery-powered timing circuits, and simple industrial control loops. Because the part is OTP rather than flash, it is best suited for mature, high-volume products where firmware is finalized and field re-programming is not required. When designing with the PIC16C56-HSE/SS, ensure a clean +5V (or 3V) rail with a 0.1uF decoupling capacitor near VDD, and route the 16MHz crystal with short, symmetric traces. Because the device is OTP, the firmware image must be fully validated before programming; consider PIC16F56 (flash-based) for prototypes. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet. The accompanying FAQ and comparison tables are optimized for engineers searching for a drop-in PIC16C56 replacement or evaluating migration to flash-based PIC16F56.

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PIC16C56-HSI/P - 8-Bit 20MHz 1.5KB OTP MCU 18-PDIP | Microchip
PIC16C56-HSI/P

PIC16C56-HSI/P - 8-Bit 20MHz 1.5KB OTP MCU 18-PDIP | Microchip

The Microchip Technology PIC16C56-HSI/P is an 8-bit RISC microcontroller from the PIC16C5x family, featuring a 20 MHz maximum clock speed, 1.5 KB (1K x 12) of One-Time-Programmable (OTP) program memory and 25 bytes of RAM in an 18-pin PDIP through-hole package. The "HSI" suffix denotes a high-speed crystal/resonator oscillator variant with industrial temperature grade (-40C to +85C), and the "/P" denotes the plastic DIP package. Operating voltage is 4.5 V to 5.5 V (with 3.3 V / 5 V dual operation supported per third-party listings). A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, data memory, and programmable I/O peripherals, designed for embedded control tasks. The PIC16C5x family uses a Harvard architecture with a 12-bit wide instruction word and 8-bit wide data path, providing roughly 2:1 code compression over competitive 8-bit MCUs of the same era. The PIC16C56-HSI/P fits within the broader taxonomy: microcontroller -> embedded controller -> semiconductor IC, and is designed for cost-sensitive and space-constrained embedded applications. Key features include a two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0) with 8-bit prescaler, and 12 digital I/O pins. The OTP program memory allows one-time field programming via Microchip device programmers such as MPLAB PM3, while the simple 33-instruction set reduces firmware development time. Seven or eight special-function hardware registers provide register-based peripheral control. Architecturally, the PIC16C56 separates code and data buses (Harvard architecture) which lets the CPU fetch an instruction and read data in the same cycle, doubling throughput versus single-bus designs. The 12-bit instruction word is highly orthogonal and symmetrical, simplifying assembler programming. The HS oscillator supports external crystal or resonator operation from approximately 4 MHz to 20 MHz, while the 8-bit timer/counter and prescaler handle periodic interrupt generation and event counting. Typical applications include consumer appliance control, low-end automotive subsystems (body controllers, lighting), industrial automation timers/counters, simple sensor front-ends, LED sequencing, and replacement of discrete logic in legacy designs. The 18-pin PDIP package supports prototyping and through-hole assembly favored in educational, hobbyist, and legacy maintenance environments. When designing with this part, note that OTP memory cannot be erased - firmware must be fully validated before programming. For new designs, consider PIC16F equivalents with Flash memory for in-circuit reprogrammability. The HS oscillator requires an external crystal or resonator across OSC1/OSC2 with appropriate loading capacitors. This page synthesizes distributor pricing, drop-in same-package alternatives within the PIC16C5x family, and design considerations not consolidated in the manufacturer datasheet, helping engineers select a pin-compatible replacement or source this legacy part efficiently.

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PIC16C56-HSI/SO - 1.5KB EPROM 8-bit MCU 20MHz SOIC-18 | Microchip
PIC16C56-HSI/SO

PIC16C56-HSI/SO - 1.5KB EPROM 8-bit MCU 20MHz SOIC-18 | Microchip

The Microchip Technology PIC16C56-HSI/SO is an EPROM/ROM-based 8-bit CMOS microcontroller in the PIC16C5X family, packaged in an 18-pin SOIC (SO) with 1.5 KB (actually 1024 x 12 words) of one-time-programmable EPROM program memory, 25 bytes of RAM, and 12 digital I/O pins. It executes most instructions in a single 200 ns cycle at a 20 MHz external clock, delivering up to 5 MIPS of throughput with the high-speed (HS) oscillator option. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripherals such as timers and I/O ports into one package. Within the embedded hierarchy it sits below microprocessors and above simple logic ICs; it is the dominant building block for cost-sensitive, deterministic control tasks. The PIC16C5X family uses a 12-bit-wide instruction word and a two-level hardware stack to deliver 2:1 code compression over typical 8-bit CISC MCUs of its era. Key features include 12 I/O pins, an 8-bit real-time counter/timer (TMR0) with 8-bit prescaler, a Watchdog Timer (WDT) for reliable operation, Power-on Reset (POR), and direct/indirect/relative addressing modes. The HSI suffix denotes the high-speed (HS) crystal/oscillator mode (up to 20 MHz) and the industrial temperature grade. Operating voltage spans 2.5 V to 6.25 V across the family. Architecturally the PIC16C56 implements a RISC-style Harvard design with seven or eight special-function hardware registers, a 2-level deep hardware call/return stack, and an 8-bit ALU. The 12-bit instruction word keeps program memory compact; the same source code typically occupies roughly half the ROM of an equivalent 8-bit CISC device. Seven special-function registers and an internal 8 MHz RC option (RC oscillator suffix) are available across the family. Typical applications include appliance controls, automotive subsystems (body and lighting), consumer electronics, security and sensor front-ends, and low-cost industrial timers. The 18-pin SOIC footprint suits through-hole replacement designs migrating to surface-mount assembly lines. Design consideration: the EPROM cell is OTP - once programmed it cannot be erased. For prototyping or field-updatable firmware, choose a Flash-based variant such as PIC16F54 or PIC16F506 in the same 18-pin family. This page synthesizes distributor pricing, drop-in same-package alternatives from the PIC16C5X family, application guidance and design notes not found in the bare datasheet - giving an engineer an at-a-glance procurement and migration view of this legacy Microchip part.

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PIC16C56-HSI/SS - 8-bit EPROM MCU, 1KB, 12 I/O, SSOP-20 | Microchip
PIC16C56-HSI/SS

PIC16C56-HSI/SS - 8-bit EPROM MCU, 1KB, 12 I/O, SSOP-20 | Microchip

The Microchip Technology PIC16C56-HSI/SS is a member of the original PIC16C5X family of 8-bit CMOS RISC microcontrollers, offered in a 20-pin SSOP (Shrink Small Outline Package, 5.30 mm body width) with industrial temperature grade. The HSI suffix indicates a high-speed internal oscillator variant and the SS suffix denotes the SSOP-20 package; the device integrates 1.5 KB of one-time-programmable (OTP) EPROM program memory and 25 bytes of general-purpose SRAM in a 20-pin microcontrollable footprint with 12 GPIO pins. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces (timers, interrupts, I/O) onto one die. The PIC16C5X baseline architecture belongs to the RISC (Reduced Instruction Set Computer) microcontroller family, which is the parent class for PIC16F, PIC18, and dsPIC devices. Within that taxonomy, the PIC16C56 sits below PIC16C55 (smaller memory variant) and above PIC16C57 (larger memory variant), all sharing the same 12-bit instruction word and 8-bit data path. This baseline MCU category is widely used in cost-sensitive, deterministic embedded applications such as appliance control, sensor interfaces, and simple timers. Key specifications of the PIC16C56-HSI/SS include a maximum clock speed of 20 MHz (with instruction cycle time of 200 ns at 20 MHz, derived from a four-clock-per-instruction design), 12-bit wide instructions, an 8-bit wide data path, seven or eight special-function hardware registers, a two-level deep hardware stack, and direct/indirect/relative addressing modes for both data and instructions. The device integrates an 8-bit real-time clock/counter (TMR0), a watchdog timer (WDT), and Power-on Reset (POR). Operating voltage spans 4.5 V to 5.5 V with a 5.0 V nominal supply, and the part is rated for the industrial temperature range of -40 °C to +85 °C. From a system-architecture perspective, the PIC16C56-HSI/SS uses a Harvard memory architecture with separate program and data buses, enabling simultaneous instruction fetch and data access. Its 12-bit instruction set is highly symmetrical, achieving roughly 2:1 code compression versus competing 8-bit microcontrollers in the same class (per Microchip PIC16C5X family documentation). The HSI oscillator option eliminates the need for an external crystal at lower accuracy, reducing BOM cost and PCB area in cost-driven designs. Typical applications include low-cost consumer appliance controllers, battery chargers, simple sensor signal conditioning, LED lighting controllers, and replacement of discrete logic in timing and sequencing circuits. The 12 GPIO pins support direct drive of small relays, LEDs, and logic-level peripherals, while the integrated TMR0 and WDT provide deterministic timing and recovery from software lockups. When designing with this part, note that the EPROM program memory is one-time programmable (OTP); for field firmware updates, choose the PIC16F or PIC16C variants with flash/EPROM that can be reprogrammed, or use a JW windowed package for development. Decoupling: place a 0.1 µF ceramic bypass capacitor as close as possible to the VDD pin to suppress switching noise on the internal logic. This page synthesizes distributor pricing, drop-in SSOP-20 alternatives from the same PIC16C5X family, and practical design notes that are not aggregated on any single manufacturer or distributor page.

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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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