PIC16LC56A-04/SO
PIC16LC56A-04/SO - 1.5KB OTP 8-bit MCU 4MHz SOIC-18 | Microchip
The Microchip Technology PIC16LC56A-04/SO is an 8-bit RISC microcontroller from the PIC16C5X family, featuring 1.5KB (1K x 12) of One-Time Programmable (OTP) program memory, 25 bytes of RAM, and 12 I/O pins, operating at up to 4 MHz from a 3V to 6.25V supply in an 18-pin SOIC package. The part is a low-power CMOS variant of the PIC16C56A, identified by the "LC" prefix denoting the wide-voltage "L" family and OTP "C" memory type, designed for cost-sensitive embedded control applications where deterministic execution and minimal external component count are critical.
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data RAM, and peripheral I/O on one die. MCUs sit at the top of the embedded system hierarchy alongside DSPs, FPGAs, and ASICs, and the PIC16C5X family in particular pioneered the Harvard-architecture 8-bit RISC segment, delivering 12-bit-wide instructions with 2:1 code compression versus typical 8-bit CISC competitors, which translates into higher effective code density per kilobyte of program memory.
Key features include a 4 MHz maximum clock rate, a 33-instruction RISC core with 12-bit opcode width, two 8-bit I/O ports (Port A and Port B) totaling 12 I/O lines, a programmable watchdog timer, an 8-bit real-time counter/counter (TMR0) with programmable prescaler, and power-saving SLEEP mode. The OTP memory is one-time programmable, making this part well suited to volume production runs that do not require firmware updates in the field.
The PIC16LC56A-04/SO uses a Harvard architecture with separate program and data buses, enabling single-cycle instruction fetch except for program branches. The four-megahertz internal oscillator divider and the integrated power-on reset and brown-out detect (not always present on the 16C5X base line, please verify per revision) simplify external circuitry. The "-04" speed suffix designates the 4 MHz maximum clock, distinguishing it from the "-10" and "-20" variants that operate at higher frequencies.
Typical applications include low-cost consumer appliances, remote control transmitters, sensor signal conditioning front-ends, battery-powered timer products, automotive body electronics modules, and simple industrial control replacement of discrete logic. The 12 I/O lines comfortably drive LED arrays, keypads, small character LCDs and relay or triac interfaces. The wide 3V to 6.25V supply range is friendly to both 3.3V and 5V rails.
When designing with this device, plan the OTP programming step into your production flow because OTP cannot be erased or rewritten. Reserve a 100 nF decoupling capacitor close to VDD and a 10 kohm pull-up on MCLR, and verify timing margins at the worst-case 4 MHz and the minimum VDD of 3.0V, since CMOS RISC cores can slow dramatically near the lower supply bound.
This page synthesizes distributor pricing across Mouser, LCSC and Jotrin, parametric alternatives from the PIC16C5X pin-compatible family, and practical design notes that go beyond the bare Microchip datasheet.
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