PIC16C56A/JW - 8-Bit 20MHz 1.5KB EPROM MCU | Microchip
料号： PIC16C56A/JW ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.95 | $89.50 |
| 100 | $7.85 | $785.00 |
| 500 | $6.95 | $3,475.00 |
| 1,000 | $5.95 | $5,950.00 |
PIC16C56A/JW 概述
A PIC microcontroller (Programmable Intelligent Computer, also known as Peripheral Interface Controller) is a Harvard-architecture RISC MCU family in which program and data memories occupy separate address spaces. The PIC16C5x sub-family is the legacy "baseline" tier of PIC microcontrollers, positioned below the PIC16C7x/8x mid-range family and well below the PIC18 enhanced family in the modern Microchip taxonomy. The 'C' suffix denotes CMOS EPROM technology (later replaced by flash-based PIC16F parts), and the JW package is reserved almost exclusively for engineering development because of its quartz window and high cost.
Key features of the PIC16C56A include seven or eight special-function hardware registers, a two-level deep hardware call stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0) with a programmable prescaler, 12 programmable digital I/O lines, a Power-on Reset (POR) block, and a Watchdog Timer (WDT) for unattended operation. The Harvard architecture separates the 12-bit program bus from the 8-bit data bus, allowing instruction fetch and operand access to occur in the same cycle.
Typical applications include low-cost 8-bit embedded control in industrial timers and counters, appliance controllers, simple sensor front-ends, LED and relay driver boards, and educational/hobbyist platforms where the UV-erasable window allows repeated firmware iteration. The JW windowed CERDIP package is rarely used in production builds because the OTPEPROM can be erased and reprogrammed in-circuit by exposing the die to UV light through the quartz window.
Designers should note that the PIC16C56A is widely regarded as mature/legacy silicon. For new designs, Microchip recommends the flash-based PIC16F54 in a modern SOIC or QFN package. The CERDIP JW variant is best reserved for development, lab work, and legacy board repair. Pricing varies significantly with availability because of limited production runs.
直接替换替代料： PIC16C56A/JW ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC16C56A/JW （相同外形与封装尺寸） ——差异在于 Program Memory Size, Core Architecture, Program Memory Type, I/O Pins, Package.
快速对比工具——选择替代料号进行并排对比：
PIC16C56/JW
✅ 直接替换✓ 有现货
$7.4 / 个
查看数据手册 →PIC16C55/JW
✅ 直接替换✓ 有现货
$10.4 / 个
查看数据手册 →PIC16C554/JW
✅ 直接替换✓ 有现货
$4.69 / 个
查看数据手册 →PIC16C558/JW
✅ 直接替换✓ 有现货
$4.85 / 个
查看数据手册 →PIC16C54/JW
✅ 直接替换✓ 有现货
$4.85 / 个
查看数据手册 →PIC16C56A/JW 最大额定值与电气特性
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory Size | 1.5 KB (1K x 12) EPROM, UV-erasable |
| Data RAM | 25 bytes |
| Data EEPROM | None |
| Instruction Width | 12-bit |
| 数据总线宽度 | 8-bit |
| 最大时钟频率 | 20 MHz |
| Operating Voltage Range | 2.5 V to 6.25 V (commercial) |
| Programmable I/O Pins | 12 |
| Timers | 1 x 8-bit TMR0 with prescaler |
| Hardware Stack Depth | 2 levels |
| Watchdog Timer (WDT) | Yes |
| Power-on Reset (POR) | Yes |
| 封装 | 18-pin CERDIP with UV window (JW) |
| 安装类型 | Through-Hole |
| 工作温度 | 0C to +70C (commercial) |
PIC16C56A/JW 引脚配置
| 引脚 1 | RA2 — Port A bit 2 (bidirectional digital I/O) |
| 引脚 2 | RA3 — Port A bit 3 (bidirectional digital I/O) |
| 引脚 3 | RTCC — TMR0 real-time clock/counter external input |
| 引脚 4 | MCLR — Master Clear (reset, active low) |
| 引脚 5 | VSS — Ground |
| 引脚 6 | RB0 — Port B bit 0 (bidirectional digital I/O) |
| 引脚 7 | RB1 — Port B bit 1 (bidirectional digital I/O) |
| 引脚 8 | RB2 — Port B bit 2 (bidirectional digital I/O) |
| 引脚 9 | RB3 — Port B bit 3 (bidirectional digital I/O) |
| 引脚 10 | RB4 — Port B bit 4 (bidirectional digital I/O) |
| 引脚 11 | RB5 — Port B bit 5 (bidirectional digital I/O) |
| 引脚 12 | RB6 — Port B bit 6 (bidirectional digital I/O) |
| 引脚 13 | RB7 — Port B bit 7 (bidirectional digital I/O) |
| 引脚 14 | VDD — Positive supply voltage |
| 引脚 15 | OSC1/CLKIN — Oscillator input / external clock in |
| 引脚 16 | OSC2/CLKOUT — Oscillator output / crystal connection |
| 引脚 17 | RA0 — Port A bit 0 (bidirectional digital I/O) |
| 引脚 18 | RA1 — Port A bit 1 (bidirectional digital I/O) |
典型应用
PIC16C56A/JW 适用于 6 应用s: Industrial Timer and Counter Controller, Appliance Control Board, Educational Microcontroller Training Kit, Sensor Front-End and Signal Conditioning, LED Driver and Display Sequencer, Legacy Board Repair and Obsolete Inventory Sustainment.
Industrial Timer and Counter Controller
The PIC16C56A/JW's 8-bit TMR0 with programmable prescaler makes it a natural fit for industrial timer and pulse-counter boards. Its 1.5 KB EPROM holds compact state-machine code for sequencing relays, while the 12 digital I/O lines drive seven-segment displays, keypad scans, and buzzer outputs directly. At 20 MHz the instruction cycle is 200 ns, which is fast enough to debounce mechanical contacts in firmware and count quadrature encoder pulses in real time. The Watchdog Timer recovers the MCU from firmware lockups in unattended factory installations, and Power-on Reset guarantees a defined startup after brown-out events on noisy 24V industrial rails. The CERDIP JW windowed package is ideal for development because UV erasure allows rapid firmware iteration during prototyping.
推荐
Appliance Control Board
Low-cost appliance controllers - washing machines, microwave ovens, dishwashers - benefit from the PIC16C56A/JW's small footprint, low power consumption, and integrated peripherals. The 25-byte RAM and 1.5 KB EPROM are sufficient for simple wash-cycle state machines, while the 12 I/O pins drive relays, triac interfaces, and seven-segment LED displays without external mux logic. The 2.5 V to 6.25 V operating range tolerates unregulated supply rails common in white goods. The Watchdog Timer prevents the appliance from hanging in an unsafe state, and the PIC RISC core executes deterministic instruction cycles that simplify safety-software certification. The JW package is reserved for development; production builds use the plastic CERDIP or PDIP OTP variants.
推荐
Educational Microcontroller Training Kit
The PIC16C56A/JW is widely used in university embedded-systems courses and self-study kits because of its simple Harvard architecture, transparent instruction set, and small 1.5 KB EPROM that students can fully master in a single semester. The JW windowed CERDIP package lets students erase their code with a UV lamp and re-program the part dozens of times, mirroring the iterative learning workflow of classic EPROM development boards. The 18-pin through-hole package is breadboard-friendly, and the 20 MHz maximum clock is fast enough to demonstrate real-time control loops. Reference designs in Microchip application notes drive LEDs, read switches, and generate PWM with nothing but the internal TMR0 peripheral.
推荐
Sensor Front-End and Signal Conditioning
Simple sensor front-ends - temperature, humidity, and proximity - can be built around the PIC16C56A/JW with nothing more than a few op-amps and a UART or I/O bit-banged interface to the host. The 12-bit instruction width and 25-byte RAM are sufficient to implement linearization lookup tables for thermocouples and thermistors, while the 8-bit ADC-less I/O pin scheme supports external sigma-delta or integrating ADCs via TMR0 capture. The 2-level hardware stack keeps interrupt latency deterministic, which is critical for time-multiplexed sensor scanning. The Watchdog Timer is essential in remote sensor nodes that must recover autonomously from ESD events or supply transients.
推荐
LED Driver and Display Sequencer
LED chaser boards, scoreboard displays, and architectural lighting fixtures are simple applications for the PIC16C56A/JW. The 12 I/O pins can drive 12 LEDs directly, or matrix-multiplex a larger array via external transistors, and the 20 MHz clock supports software PWM at frequencies above the flicker fusion threshold. The 1.5 KB EPROM holds long animation sequences, and the 25-byte RAM acts as the frame buffer for matrix refresh. Brown-out and Power-on Reset guarantee clean startup on hot-pluggable USB or wall-wart supplies. The Watchdog Timer recovers the MCU if a software bug stalls the LED refresh loop.
推荐
Legacy Board Repair and Obsolete Inventory Sustainment
Many industrial and aerospace boards shipped in the 1990s and 2000s use the PIC16C56A in CERDIP and windowed CERDIP packages. The JW variant is specifically used by repair depots to replace damaged OTP parts with re-programmed windowed units, because UV erasure allows the depot to load the original firmware image onto a fresh windowed part before soldering it onto the board. The PIC16C56A/JW is also stocked by legacy-component brokers who sustain installed-base equipment with discontinued or NRND silicon. This application niche has limited but real demand, and is the primary reason the JW variant continues to be manufactured in low volumes.
推荐
推荐产品汇总
工程参考数据： PIC16C56A/JW ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC16C56/JW | PIC16C55/JW | PIC16C54/JW | PIC16C554/JW | PIC16C558/JW |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-CERDIP with UV window (JW) | 18-CERDIP with UV window (JW) - same | 18-CERDIP with UV window (JW) - same | 18-CERDIP with UV window (JW) - same | 18-CERDIP with UV window (JW) - same | 18-CERDIP with UV window (JW) - same |
| Program Memory | 1.5 KB (1K x 12) EPROM | 1.5 KB (1K x 12) EPROM | 768 B (512 x 12) EPROM | 768 B (512 x 12) EPROM | 896 B (512 x 14) EPROM | 3.5 KB (2K x 14) EPROM |
| Instruction Width | 12-bit | 12-bit | 12-bit | 12-bit | 14-bit | 14-bit |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Data RAM | 25 bytes | 25 bytes | 25 bytes | 25 bytes | 80 bytes | 128 bytes |
| I/O Pins | 12 | 12 | 12 | 12 | 13 | 13 |
| Watchdog Timer | Yes | Yes | Yes | Yes | Yes | Yes |
关键差异点
- Modern silicon revision with extended voltage range over original PIC16C56 （对比 PIC16C56/JW)
- Largest baseline-family EPROM in the same 18-pin JW windowed package （对比 PIC16C54/JW / PIC16C55/JW)
- True drop-in replacement with same package and pinout vs modern flash-based PICs （对比 PIC16F54-I/P)
设计说明
The JW windowed CERDIP cannot be reprogrammed in-circuit - erasure requires 20+ minutes of UV exposure through the quartz window. Do not use JW parts in production; choose the OTPEPROM equivalent (PIC16C56A-04/P or /SO) for production builds and keep JW only for development and legacy repair workflows.
Estimated: at 20 MHz and 5V supply, the PIC16C56A/JW typically draws 5-10 mA active and a few hundred microamps in sleep mode. Add a 100 nF decoupling capacitor as close as possible to VDD (pin 14) and a 10 uF bulk capacitor at the regulator output to handle inrush when the MCU exits sleep and clocks up to 20 MHz.
The 18-pin CERDIP JW package is through-hole with 2.54 mm (0.1 inch) pin pitch, so it fits standard breadboard and veroboard patterns. Keep the MCLR pull-up (typically 10 kohm) close to pin 4 to avoid spurious resets, and place the decoupling capacitor within 5 mm of VDD (pin 14). The crystal or resonator on OSC1/OSC2 should sit within 10 mm of pins 15-16 to minimize stray capacitance.
The 2-level hardware stack means the PIC16C56A/JW cannot nest more than 2 subroutines deep. Writing more than 2 CALL layers will corrupt the return PC and crash the firmware. Plan the call graph carefully, or refactor deeply nested code into iterative state machines. This is a well-known PIC16C5x baseline-family limitation versus the 8-level stack of PIC16F mid-range parts.
合规信息
RoHS, REACH, lead-free, and halogen-free status not present in the verified web data and should be confirmed with Microchip directly. AEC-Q100 is not applicable - the PIC16C56A/JW is not qualified for automotive safety use.
