PIC16C54A-04/SS
PIC16C54A-04/SS - 8-Bit 4MHz OTP MCU, 768B | Microchip
The Microchip Technology PIC16C54A-04/SS is an 8-bit EPROM/ROM-based CMOS microcontroller from the PIC16C5x family operating at up to 4MHz, with 768 bytes (512 x 12) of One-Time-Programmable (OTP) program memory and 25 bytes of RAM, housed in a 20-pin SSOP package. It delivers 12 I/O pins, a two-level deep hardware stack, and a single 8-bit Timer0 with a programmable prescaler, providing a compact, low-cost RISC control platform for simple embedded designs.
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, I/O peripherals, and timers on one die. The PIC16C54A belongs to the original PIC16C5x baseline family introduced by Microchip in the early 1990s; these were the industry's first 8-bit RISC microcontrollers with 12-bit-wide instructions and an 8-bit-wide data path, achieving 2:1 code compression over competing 8-bit architectures in the same price tier. This category sits within the broader hierarchy: 8-bit microcontroller -> RISC microcontroller -> embedded controller -> integrated circuit.
Key features of the PIC16C54A-04/SS include 33 single-word, single-cycle instructions, direct/indirect/relative addressing modes, a power-on reset, a watchdog timer with on-chip RC oscillator, and a wide operating voltage range from 2.5V to 6.0V. The '04' speed grade specifies a 4MHz maximum clock, and the OTP EPROM program memory is ideal for low- to medium-volume production where mask-ROM tooling is uneconomical. CMOS technology delivers low power consumption (typically < 2 mA at 5V/4MHz), making this part suitable for battery-aware applications.
Architecturally, the device uses a Harvard-style separate code and data bus, a 12-bit instruction word, and a small register file of seven or eight special-function hardware registers. This minimal footprint is intentional: the design optimises die area, cost, and predictability for high-volume appliance and consumer-electronics tasks rather than peripheral-rich applications. There is no ADC, no UART, no interrupts, and no on-chip oscillator, keeping the silicon die small and the unit price low.
Typical applications include remote controls, small appliance controls, LED driving patterns, simple sensor interfaces, battery chargers, security keypads, and any cost-sensitive volume-production design that previously used discrete logic. The SSOP-20 footprint is well supported on standard pick-and-place lines and accepts hand-soldering for prototyping.
When designing with this part, note that Microchip's product page explicitly states: a newer device is available, please consider PIC16F54. The PIC16F54 is the recommended flash-memory successor for new designs. The PIC16C54A-04/SS remains in production for existing designs and maintenance spares but should not be selected for new projects.
This page synthesises distributor pricing, cross-reference alternatives, and design notes not found in the manufacturer datasheet alone. Engineers comparing OTP vs flash 8-bit MCUs will find the comparison table and alternatives array particularly useful.
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