This is the preliminary version of PIC18F2423/2523/4423/4523 data sheet published by Microchip Technology Inc. in 2006.
The PIC18F2423/2523/4423/4523 family are 28‑, 40‑, and 44‑pin enhanced‑flash microcontrollers featuring 12‑bit, up to 13‑channel A/D converters, nanoWatt low‑power modes, and a rich set of peripherals such as dual comparators, multiple UARTs, SPI, I²C, and PWM modules. They operate from 2.0 V to 5.5 V and include advanced features like a 8×8 hardware multiplier, extended watchdog timer, and high/low‑voltage detection.
The datasheet provides detailed electrical characteristics, pin diagrams, oscillator configurations, power‑managed mode currents, memory sizes, and packaging information, helping designers select the appropriate device and integrate it into their applications.