PIC16C54/JW - 4MHz 8-Bit OTP EPROM MCU | Microchip | 18-CERDIP
MPN: PIC16C54/JW β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.45 | $7.45 |
| 10 | $6.85 | $68.50 |
| 100 | $6.1 | $610.00 |
| 500 | $5.4 | $2,700.00 |
| 1,000 | $4.85 | $4,850.00 |
PIC16C54/JW Overview
The PIC16C54 belongs to the classic PIC16C5X family of low-cost, high-performance 8-bit fully-static EPROM/ROM-based CMOS microcontrollers. It uses a RISC architecture with only 33 single-word/single-cycle instructions, providing a 2:1 code compression advantage over competing 8-bit MCUs in its class. A PIC16C5X device is a member of the broader PIC (Peripheral Interface Controller) family, which is a type of microcontroller (MCU) β a small computer-on-a-chip containing CPU, memory, and I/O peripherals on a single integrated circuit. Within that hierarchy, the PIC16C54 is a 'low-end' baseline MCU aimed at simple embedded control tasks.
Key features of the PIC16C54/JW include a 12-bit instruction word with an 8-bit data path, two-level deep hardware stack, direct/indirect/relative addressing modes, an 8-bit real-time counter (TMR0), and a 4MHz maximum clock frequency. It supports 4.5V to 5.5V supply operation, a watchdog timer, power-on reset, and 12 CMOS-compatible bidirectional I/O lines. The 'JW' suffix denotes the ceramic CERDIP package with an ultraviolet-erasable window, which allows engineers to erase and re-program the device multiple times during prototyping.
From an architectural standpoint, the PIC16C54/JW is built on Microchip's baseline PIC core, which executes one instruction per clock cycle (no pipeline stalls on instruction fetches thanks to Harvard architecture separation of program and data memories). The 12-bit instruction width reflects the baseline PIC's emphasis on compact code rather than register-rich operation. The two-level hardware stack is intentionally shallow, which constrains subroutine nesting depth but keeps the device deterministic for interrupt-free control loops.
Typical applications for the PIC16C54/JW include industrial control logic, simple sensor interfaces, consumer appliance controllers, automotive subsystems (pre-CAN), and legacy embedded systems. It is particularly suited to low-cost, low-power applications where a small instruction set, small memory footprint, and proven long-term availability are valued. The windowed CERDIP package is used during development and field upgrades; for production, the OTP plastic variants (PIC16C54-04/P, PIC16C54-10/P) are preferred.
When designing with the PIC16C54/JW, engineers must note that the 4MHz maximum clock rate limits it to roughly 1 MIPS of throughput, and the 2-level hardware stack restricts nested subroutines to two levels. Erasure of the windowed CERDIP package requires a UV EPROM eraser (approximately 20 minutes of high-intensity UV exposure) before re-programming. For new designs, Microchip recommends the modern PIC16F54 flash-memory successor as a pin-compatible migration path.
This page synthesizes distributor availability, same-family drop-in alternatives, and practical UV-EPROM design notes not found on a single manufacturer page.
Drop-in alternatives for PIC16C54/JW β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16C54A-I/JW
β Drop-Inπ Reference alternative (not in catalog)
PIC16C54C-I/JW
β Drop-Inπ Reference alternative (not in catalog)
PIC16C54/JW
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$4.85 / Unit
View Datasheet βPIC16F54-I/P
β Drop-Inπ Reference alternative (not in catalog)
Z86E02
β Drop-Inπ Reference alternative (not in catalog)
PIC16C54/JW Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Family | PIC16C5X (baseline) |
| Program Memory Type | EPROM, UV-erasable (windowed) |
| Program Memory Size | 768 B (512 x 12 words) |
| RAM | 25 B |
| Instruction Width | 12 bits |
| Data Path Width | 8 bits |
| Instruction Set Size | 33 single-word instructions |
| Maximum Clock Frequency | 4 MHz |
| Approximate Throughput | 1 MIPS |
| Supply Voltage Range | 4.5 V to 5.5 V |
| I/O Pins | 12 |
| Timers | 8-bit TMR0 (real-time clock/counter) |
| Hardware Stack | 2 levels |
| Addressing Modes | Direct, Indirect, Relative |
| Package Type | 18-pin CERDIP, windowed (JW) |
| Operating Temperature Range | Commercial (0C to +70C) |
| Mounting Type | Through-hole |
| Special Features | Watchdog timer, Power-on Reset, CMOS I/O |
PIC16C54/JW Pin Configuration
| Pin 1 | RA2 β Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 β Bidirectional I/O port A bit 3 |
| Pin 3 | RTCC β TMR0 real-time clock/counter input |
| Pin 4 | MCLR/VPP β Master clear reset (active low) / programming voltage input |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RB0 β Bidirectional I/O port B bit 0 |
| Pin 7 | RB1 β Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 β Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 β Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 β Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 β Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 β Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 β Bidirectional I/O port B bit 7 |
| Pin 14 | VDD β Positive supply voltage (4.5 V to 5.5 V) |
| Pin 15 | OSC2/CLKOUT β Oscillator output / clock out |
| Pin 16 | OSC1/CLKIN β Oscillator input / external clock in |
| Pin 17 | RA0 β Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 β Bidirectional I/O port A bit 1 |
Typical Applications
PIC16C54/JW is suitable for 6 applications: Industrial Control Logic, Simple Sensor Interface MCU, Consumer Appliance Controller, Automotive Body Electronics (Legacy), Educational and Development Platform, Legacy Embedded System Maintenance.
Industrial Control Logic
The PIC16C54/JW fits industrial control logic with its 12 CMOS I/O pins driving relays, optocouplers, and discrete transistors in factory automation subsystems. Its 4 MHz clock and 1 MIPS throughput handle encoder decoding, simple state machines, and limit-switch sequencing for conveyors, packaging lines, and machine-tool interlocks. The 4.5 V to 5.5 V supply matches 5 V industrial backplanes, and the 25-byte RAM is sufficient for bit-banged protocols such as I/O-port emulation. Unlike a modern Cortex-M0, the PIC16C54's deterministic 1 MIPS and 2-level hardware stack give it predictable interrupt-free loop timing, which is valued in legacy PLC-style control blocks. Use it where BOM cost dominates and the firmware is small.
Recommended
Simple Sensor Interface MCU
With 12 I/O pins and an 8-bit TMR0 counter, the PIC16C54/JW serves as an interface MCU for simple digital and analog sensors in instrumentation. Designers bit-bang SPI or I2C using two GPIO pins each, while TMR0 generates precise timing for ultrasonic transducers, thermistor sampling windows, or PIR sensor blanking intervals. The 768 B EPROM holds sensor-fusion lookup tables and state-machine code, and the 4 MHz clock samples low-frequency analog signals at 100 kHz+ rates via an external ADC such as MCP3001. Compared to a digital-signal processor, the PIC16C54 trades raw throughput for deterministic execution and a tiny footprint, making it ideal for low-cost remote sensor nodes.
Recommended
Consumer Appliance Controller
The PIC16C54/JW is a proven controller in consumer appliances such as washing-machine timers, microwave user interfaces, and HVAC damper actuators where cost dominates over computational power. Its 33-instruction RISC core runs one instruction per cycle, making state-machine code (e.g., washing-machine cycles) compact and easy to certify. The 12 I/O pins drive 7-segment displays, keypads, and triac-fire optos, while the watchdog timer resets the MCU on firmware lockup to meet appliance-safety norms. The 4.5 V-5.5 V supply range tolerates rectified 5 V rails from small transformers. Its ceramic CERDIP /JW form is used for prototyping; production builds migrate to the OTP /P variant.
Recommended
Automotive Body Electronics (Legacy)
Pre-CAN automotive subsystems β seat controllers, mirror positioners, window lifters, and lighting sequencers β historically used PIC16C54-class MCUs because of their small size, low cost, and 5 V tolerance of 12 V vehicle transients (with external clamping). The PIC16C54/JW's 12 I/O pins drive H-bridge relays and lamp FETs, while TMR0 sequences debounce and pulse-width modulation for soft-start lighting. The 4 MHz throughput suffices for 100 Hz update loops in seat-position control. Engineers designing automotive body modules today should select AEC-Q100-qualified successors such as PIC16F15313-I/SN, but the PIC16C54/JW remains relevant in aftermarket restoration and legacy ECU repair.
Recommended
Educational and Development Platform
The PIC16C54/JW's windowed CERDIP package is ideal for university labs and hobbyists learning embedded systems, because the UV-erasable window lets students re-program the same chip dozens of times. The 12-bit instruction set is small enough to teach RISC fundamentals (single-cycle execution, Harvard separation of program/data memory) without overwhelming beginners, yet powerful enough to demonstrate timers, interrupts-free polling, and I/O expansion. Educational kits pair the PIC16C54/JW with simple LED, button, and seven-segment peripherals on a breadboard-compatible PCB. The /JW windowing also teaches UV-EPROM erase mechanics, a foundational concept in computing history.
Recommended
Legacy Embedded System Maintenance
The PIC16C54/JW remains in service across thousands of legacy industrial and scientific instruments installed in the 1990s and early 2000s. Field service engineers keep a stock of windowed CERDIP PIC16C54/JW units to replace failed MCUs in equipment where re-programming the original firmware is required. The JW window allows the engineer to read firmware from a known-good device using an EPROM programmer, then duplicate it onto a fresh device. The 4 MHz / 768 B EPROM combination is sufficient for vintage instruments that run simple polling loops without networking.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C54/JW β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C54A-I/JW | PIC16C54C-I/JW | PIC16C54/JW (industrial) | PIC16F54-I/P | Z86E02 |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Zilog |
| Package | 18-CERDIP (windowed) | 18-CERDIP (windowed) - same | 18-CERDIP (windowed) - same | 18-CERDIP (windowed) - same | 18-PDIP - same footprint family | 18-DIP - same footprint |
| Program Memory Type | UV-EPROM (windowed) | UV-EPROM (windowed) - same | UV-EPROM (windowed) - same | UV-EPROM (windowed) - same | Flash (electrically erasable) | OTP/EPROM |
| Program Memory Size | 768 B (512 x 12) | 768 B (512 x 12) | 768 B (512 x 12) | 768 B (512 x 12) | 768 B (512 x 12) - same | 2 KB |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz (higher performance) | 8 MHz |
| RAM | 25 B | 25 B | 25 B | 25 B | 25 B | 61 B |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 14 |
| Core Architecture | PIC16C5X (12-bit baseline) | PIC16C5X (12-bit baseline) - same | PIC16C5X (12-bit baseline) - same | PIC16C5X (12-bit baseline) - same | Enhanced PIC16 (14-bit baseline) | Z8 (8-bit) |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.0 V to 5.5 V (wider range) | 3.5 V to 5.5 V |
Key Differentiators
- Windowed CERDIP allows UV erasure and many re-programming cycles (vs PIC16C54-04/P)
- C-grade silicon revision provides improved electrical characteristics (vs PIC16C54/JW (original))
- Flash memory eliminates UV eraser dependency (vs PIC16F54-I/P)
- Cross-brand Z8 architecture upgrade with more memory and I/O (vs Z86E02)
Design Notes
The PIC16C54's 2-level hardware stack restricts nested subroutine calls to a depth of 2. Calling depth 3 or more (without manual stack emulation in RAM) causes a stack overflow and PC corruption. This is the single most common source of mysterious resets on PIC16C5X firmware β keep call graphs flat, or migrate to PIC16F84 or PIC16F628 which have 8-level stacks.
Keep the MCLR/VPP trace short and place a 10 kohm pull-up to VDD. During in-circuit programming, VPP rises to ~13 V; long MCLR traces pick up noise that can trigger spurious resets. Place the 4 MHz crystal or resonator within 1 cm of OSC1/OSC2 with a solid ground plane underneath, and add 15-33 pF load capacitors per the crystal datasheet (not the MCU datasheet).
Estimated: at 5 V supply, 4 MHz clock, all 12 I/O pins unloaded, the PIC16C54/JW draws approximately 2 mA active and 1 uA sleep (per DS30400D DC characteristics). Add a 100 nF decoupling cap close to VDD pin 14 and a 10 uF bulk cap on the board's 5 V rail to handle in-rush during Flash/EPROM programming transients.
Erasing the PIC16C54/JW windowed CERDIP requires a UV EPROM eraser with intensity >= 15 W-s/cm^2 at 253.7 nm for approximately 20 to 45 minutes. Sunlight and fluorescent lights can erase the EPROM slowly; always shield the window with opaque labels after programming. Do not scratch the window β physical damage to the quartz window permanently leaks UV and corrupts retention.
Compliance Information
Windowed CERDIP package typically uses Sn/Pb solder finish (not lead-free) β RoHS compliance depends on specific distributor lot and date code. Not AEC-Q100 qualified; for automotive applications use AEC-Q100-qualified successors such as PIC16F15313-I/SN.
