PIC16F627-20I/P
PIC16F627-20I/P - 8-bit Flash MCU, 20MHz, 1.75KB | Microchip
The Microchip Technology PIC16F627-20I/P is an 8-bit Flash-based CMOS microcontroller in a 18-pin PDIP package, delivering up to 20 MHz instruction execution with 200 ns per instruction cycle. It integrates 1.75 KB of Flash program memory, 224 bytes of RAM, 128 bytes of EEPROM data memory, 16 I/O pins, three timers, two analog comparators, a USART module, and a capture/compare/PWM peripheral. The "I" suffix denotes the industrial temperature grade of -40C to +85C, and the "20" speed grade caps the oscillator at 20 MHz, while the "/P" suffix identifies the through-hole PDIP-18 package.
An 8-bit microcontroller (MCU) is a self-contained computing IC that integrates a CPU, non-volatile program memory (Flash or ROM), volatile data memory (RAM), and peripheral blocks such as timers, communication interfaces, and analog comparators on a single silicon die. The PIC16F627 belongs to Microchip's mid-range PIC16 family, sitting in the broader hierarchy: PIC16F -> 8-bit PIC microcontroller -> microcontroller -> embedded controller -> semiconductor device. PIC MCUs are widely used because they employ a Harvard architecture with separated program and data buses, a RISC instruction set of only 35 single-word instructions, and deterministic interrupt latency that simplifies real-time firmware design.
Key features of the PIC16F627-20I/P include 1.75 KB of self-programmable Flash (100K erase/write cycles typical), 224 bytes of RAM, and 128 bytes of EEPROM for non-volatile data storage with 1M erase/write endurance. The device supports an operating voltage range of 2.0 V to 5.5 V, low-power Sleep mode with wake-up on pin change, and an internal oscillator option on later "A" revision silicon. It also provides a programmable brown-out reset, a watchdog timer with its own on-chip RC oscillator, and In-Circuit Serial Programming (ICSP) for in-system firmware updates.
Architecturally, the PIC16F627-20I/P uses a 14-bit instruction word with a hardware multiplier absent, single-cycle branch execution, and a two-stage pipeline. Its USART supports both asynchronous RS-232 and synchronous SPI master/slave modes, while the two analog comparators can be software-routed to internal reference voltages for threshold detection. These features make the device well suited to small embedded control tasks where deterministic timing and minimal external components matter more than raw compute throughput.
Typical applications include appliance control boards, sensor signal conditioning, automotive body modules (non-safety), remote controls, low-cost motor drivers, security keypads, LED lighting controllers, and small industrial sensor nodes. The wide 2.0 V to 5.5 V supply range also enables battery-powered designs powered by 2xAA or single-cell Li-ion chemistries.
When designing with this part, observe the maximum clock rate of 20 MHz versus the slower 4 MHz and 32 kHz internal oscillator options for low-power operation. Place a 100 nF decoupling capacitor close to VDD, and configure the MCLR pin with the recommended 10 kohm pull-up plus optional reset capacitor to avoid spurious resets. For designs migrating to the higher-integration PIC16F627A revision silicon, verify that any pinout or register-level changes are accommodated before qualification.
This page synthesizes distributor pricing, drop-in alternatives drawn from the PIC16F62X family, and practical design notes not consolidated in the Microchip datasheet alone.
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