PIC16LC54A-04/P
PIC16LC54A-04/P - 4MHz 8-Bit OTP MCU 18-PDIP | Microchip
The Microchip Technology PIC16LC54A-04/P is an 8-bit RISC microcontroller from the PIC16C5x family, delivering 4 MHz CPU performance with 768 bytes (512 x 12) of One-Time Programmable (OTP) program memory in an 18-pin PDIP (Plastic DIP) through-hole package. It operates from a 3 V to 6.25 V supply and is rated for the commercial temperature range of 0C to +70C. With 12 digital I/O lines, 25 bytes of RAM, a single 8-bit timer/counter (TMR0), and a 2-level hardware stack, this part targets cost-sensitive embedded applications that need predictable RISC execution with minimal peripheral overhead.
An 8-bit OTP microcontroller is a small, fixed-instruction CPU with on-chip non-volatile program memory that the end user programs once at production time. The PIC16C5x family is positioned in the broader hierarchy of: microcontroller -> 8-bit MCU -> RISC MCU -> PIC16 family -> PIC16C5x sub-family -> PIC16LC54A variant. OTP memory (One-Time Programmable, EPROM-based) is the predecessor to Flash memory and is characterized by bit-by-bit programmability and no in-circuit re-programmability, which historically made these parts attractive for high-volume, low-cost, read-mostly applications.
Key features of the PIC16LC54A-04/P include: 12-bit wide instruction words with a symmetric instruction set delivering roughly 2:1 code compression versus typical 8-bit CISC competitors; a Harvard architecture with separate program and data buses; 33 single-word instructions, all single-cycle (4 oscillator clocks) except branches which take two cycles; an 8-bit real-time clock/counter (TMR0) with an 8-bit programmable prescaler; and seven or eight special-function hardware registers. The "04" suffix denotes 4 MHz maximum clock speed, and the "LC" prefix indicates the low-power CMOS variant versus the original PIC16C54. The "/P" package suffix denotes 18-pin PDIP (Plastic DIP).
Architecturally, the PIC16LC54A-04/P uses a two-stage pipeline and a 2-level deep hardware stack, with direct, indirect, and relative addressing modes for both instructions and data. The watchdog timer is independent of the TMR0 prescaler, giving designers a clean separation between task timing and system recovery. The part supports power-on reset, brown-out detection via configuration bit, and an external MCLR reset, giving flexible bring-up options. Compared with the PIC16C54, the "A" revision added improved oscillator tolerance and wider supply voltage range.
Typical applications include: simple logic-replacement glue logic (button debouncers, sequencers, PWM LED drivers), appliance controllers (washing-machine user-interface boards, microwave user panels, thermostat slave controllers), battery chargers (lead-acid float chargers with discrete FET control), remote-control transmitter encoders, security-system keypads, and educational microcontroller kits. The wide supply range and low cost make it a popular choice for designers migrating from discrete 4000-series CMOS logic to a programmable solution.
When designing with the PIC16LC54A-04/P, note that OTP memory cannot be re-programmed in-circuit - firmware changes require a UV-erase windowed CERDIP variant (PIC16C54A-04/JW) or a new chip. For modern designs, consider migrating to a Flash-based PIC16F54, which is pin-compatible in the 18-pin PDIP footprint and provides in-circuit reprogramming. For new designs today, prefer PIC16F or PIC18 baseline parts for higher memory density, more peripherals, and modern development-tool support.
This page synthesizes verified distributor pricing, parametric data, pin-compatible drop-in alternatives, and practical design notes that the manufacturer datasheet alone does not present in a single view.
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