PIC16C620A-20/P
PIC16C620A-20/P - 8-bit OTP MCU, 20MHz, 13 I/O, PDIP-18 | Microchip
The Microchip Technology PIC16C620A-20/P is an 8-bit RISC CMOS microcontroller from the PIC16C62X family, delivering up to 20 MHz operation from a 2.5 V to 5.5 V supply in an 18-pin PDIP through-hole package. It integrates 896 bytes of one-time-programmable (OTP) program memory organized as 512 x 14 words, 96 bytes of RAM, and 13 digital I/O pins, making it a compact solution for cost-sensitive embedded control applications. The device executes most instructions in a single 200 ns cycle and supports only 35 single-word instructions for rapid firmware development.
An 8-bit microcontroller (MCU) is a small, self-contained computer-on-a-chip that integrates a CPU, memory, and peripherals on a single silicon die. Within the broader semiconductor taxonomy, MCUs belong to microcontrollers, which sit under microprocessors, which in turn fall under logic ICs and ultimately integrated circuits. The PIC16C62X series is a ROM/EPROM/OTP-based subset of Microchip's PICmicro family of low-cost, high-performance, fully-static 8-bit MCUs.
Key features include two analog comparators with a programmable on-chip voltage reference, a capture/compare/PWM (CCP) module, an 8-bit timer/counter with a prescaler, a watchdog timer with its own on-chip RC oscillator, and an internal MCLR reset path selectable via configuration bit. The PIC16C620A also offers programmable code protection, power-saving Sleep mode, and a wide operating temperature range suitable for both consumer and industrial environments.
Architecturally, the device is built on Microchip's mature RISC-style PIC core with a Harvard bus architecture and 14-bit wide instructions for OTP program memory, plus an 8-bit data path. This gives a clean separation between program and data buses, enabling deterministic instruction timing that simplifies real-time control loops. The CMOS process keeps quiescent current in the microamp range during Sleep, an advantage for battery-powered or energy-harvesting nodes.
Typical applications include appliance control, sensor signal conditioning, low-cost motor drivers, LED lighting controllers, security system peripherals, and general-purpose replacement of discrete logic. In each of these, the 13 I/O lines, integrated comparators, and small footprint of the PDIP-18 package reduce BOM count and PCB area compared with discrete implementations. The wide 2.5 V to 5.5 V supply range lets the same part run from a single Li-ion cell or a regulated 5 V rail.
Designers should note that OTP memory is one-time programmable: firmware is committed at production time and cannot be field-upgraded. If in-system reprogrammability is required, consider a Flash-based sibling such as the PIC16F62X family. For board layout, place a 0.1 microfarad decoupling capacitor as close as possible to the VDD pin, and follow Microchip's recommended MCLR reset circuit to ensure reliable startup.
This page synthesizes distributor pricing, drop-in same-package alternatives, comparator peripheral notes, and practical design considerations not found in the standalone Microchip datasheet.
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