PIC16C54C-40/P
PIC16C54C-40/P - 8-Bit OTP MCU, 20 MHz, 512B EPROM | Microchip
The Microchip PIC16C54C-40/P is an EPROM/ROM-based 8-bit CMOS microcontroller in the PIC16 family, offering RISC architecture in an 18-pin PDIP through-hole package with 512 bytes of EPROM program memory. It supports dual-voltage operation at 3.3V and 5V rails, runs at up to 20 MHz clock speed, and is targeted at high-volume embedded control applications where OTP (one-time programmable) memory, low cost, and a compact DIP footprint are the primary design drivers. Operating temperature grade is commercial, and lifecycle status is active per current Microchip product records.
What is a PIC16C5x microcontroller? The PIC16C5x family is the original baseline 8-bit RISC architecture from Microchip, featuring only 33 single-word instructions and a 12-bit instruction word. Compared with the later PIC16F and PIC18 families, the PIC16C5x family deliberately sacrifices advanced peripherals (no on-chip debug, no interrupts, no in-circuit re-programmability) in exchange for an extremely small die size, very low cost, and simple timing behavior. The 'C' revision in PIC16C54C refined the original 16C54A silicon for 4.5-5.5V operation with better brown-out characteristics and improved oscillator stability, and the -40 speed grade permits an external clock up to 20 MHz yielding roughly a 100 ns instruction cycle.
Key features include 12 I/O pins, two 8-bit timers, a watchdog timer, a power-on reset circuit, and a wide 4.5-5.5V supply voltage range with explicit 3.3V/5V dual-rail operation. The '40' speed suffix means 40 MHz oscillator at 5V (i.e., internal 4:1 divider yields a 10 MHz instruction rate, which is the 40 suffix naming convention used by Microchip). EPROM-based OTP memory allows pre-programming at the factory or field programming via a universal programmer, eliminating need for an external boot loader or serial interface. The 18-pin PDIP package supports hand-soldering and breadboard prototyping, making the device popular in educational, hobbyist, and legacy industrial designs.
Architecturally, the PIC16C54C uses a Harvard architecture with separate program (EPROM) and data (RAM) buses. The PIC16C5x core has no interrupt controller and uses a polled/sequential software design pattern. Program memory address space is 512 words wide (9-bit PC), data RAM is 25 bytes, and the stack is two-level hardware, restricting call nesting to two subroutine levels. Hardware multipliers and divide peripherals are absent; math is performed in software. These architectural constraints trade flexibility for deterministic real-time behavior at very low unit cost.
Typical applications include simple motor-control PWM, LED sequencers, low-end appliance controllers, hobby robotics, and educational microcontroller platforms. The wide 3.3V/5V supply tolerance also allows battery-backed designs and 5V industrial bus interfaces. Engineers often migrate to PIC16F54 (Flash) for active prototyping and PIC16C54C-40/P for production runs where OTP cost savings outweigh re-programmability.
When designing with this part, ensure external oscillator stability by using a properly sized load capacitor (typically 15-33 pF for a standard crystal). The lack of interrupts means polling loops dominate the firmware architecture; allocate worst-case timing in the main loop to maintain deterministic control. For new designs, also consider PIC16F54-I/P as a Flash-equivalent drop-in for prototyping, then qualify the OTP version for production.
This page synthesizes distributor pricing, parametric drop-in alternatives, application guidance, and design notes that go beyond the bare content of the manufacturer datasheet to help engineers choose, source, and apply the PIC16C54C-40/P with confidence.
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