PIC16C63T-04/SO
PIC16C63T-04/SO - 4MHz 8-Bit OTP MCU, 7KB Flash, 28-SOIC
The Microchip Technology PIC16C63T-04/SO is an 8-bit RISC microcontroller from the PIC16C6X family, delivering 4MHz maximum clock speed with 7KB (4K x 14) of One-Time-Programmable (OTP) program memory and 192 bytes of data RAM, housed in a 28-pin SOIC (SO) package. This CMOS, fully-static device operates from a 4.0V to 5.5V supply voltage and exposes 22 I/O pins, making it suitable for a wide range of embedded control applications.
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + RAM), and peripherals onto one silicon die. The PIC16C6X family is part of Microchip's PIC (Peripheral Interface Controller) architecture, itself a category of microcontroller ICs that falls under the broader taxonomy of microcontrollers -> microprocessors -> integrated circuits -> semiconductors. The 'C' in PIC16C63 denotes a one-time-programmable CMOS variant, as distinct from the flash-based PIC16F family and the read-only-memory PIC16 family. The 'T' suffix indicates tape-and-reel packaging, while '-04' specifies the 4MHz speed grade.
Key features of the PIC16C63T-04/SO include a high-performance RISC CPU with only 35 single-word instructions, all executing in a single cycle except program branches (two cycles). On-chip peripherals include one USART (asynchronous/synchronous serial), one MSSP module supporting both I2C (Master/Slave) and SPI (Master/Slave) interfaces, three timer/counters (Timer0, Timer1, Timer2), a 5-channel 8-bit ADC, and a watchdog timer with on-chip RC oscillator for reliable operation. The instruction set is fully compatible across the PIC16C6X family, easing code portability.
The PIC16C63T-04/SO architecture uses a Harvard-style separate code/data bus arrangement with a 14-bit program word and 8-bit data path. Its OTP program memory (7KB) is field-programmable only once, which suits cost-sensitive, high-volume production where the firmware is finalized at build time. Device programming is supported by the MPLAB PM3 Universal Device Programmer. The interrupt structure, on-chip reset circuitry (POR, BOR), and selectable oscillator options (RC, LP, XT, HS) simplify board-level design.
Typical applications include industrial control panels, motor drive front-ends, sensor signal conditioning, consumer appliances, automotive body electronics, and low-power instrumentation. The combination of USART + I2C/SPI + ADC makes it ideal for any system that needs to talk to sensors, drive relays or displays, and communicate with a host. Because OTP memory cannot be re-flashed, designs must be prototyped with a windowed (JW) or UV-erasable equivalent (PIC16C63-04/JW) before committing to the production OTP part.
When designing with this part, ensure the brown-out reset voltage is set above the minimum operating voltage (typically 4.0V) to avoid code corruption at slow VDD ramp times. The 28-SOIC package has a wider body than 8-pin SOIC, so PCB land pattern must match JEDEC MS-013 (0.300 inch body width). Use an external decoupling capacitor pair (100nF + 10uF) within 5mm of VDD, and configure the MCLR pin with the recommended 10k pull-up if hardware-reset is desired.
This page synthesizes distributor pricing from DigiKey, Mouser, and Octopart, lists same-brand drop-in alternatives within the PIC16C6X family, and provides practical design notes not found in the manufacturer datasheet alone.
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