80C51/87C51/80C31 80C51 8-bit microcontroller family 4K/128 OTP/ROM/ROMless low voltage (2.7V–5.5V), low power, high speed (33 MHz) Product specification
The Philips 80C51 family includes the 80C51, 87C51 and 80C31 microcontrollers. They are low‑voltage (2.7 V‑5.5 V) CMOS devices offering up to 33 MHz operation, static power‑saving modes and a rich set of on‑chip peripherals.
The document provides detailed specifications, pin descriptions, package options and operating modes such as idle and power‑down, as well as information on security bits and programming features.
| ROM size | 4 KB |
|---|---|
| RAM size | 128 bytes |
| Operating voltage | 2.7 V – 5.5 V |
| Maximum clock frequency | 33 MHz |
| I/O ports | Four 8‑bit ports |
| Counters/timers | Three 16‑bit counter/timers |
| Power‑reduction modes | Idle mode, Power‑down mode |
| Security bits | ROM (2 bits), OTP/EPROM (3 bits) |
| Package types | PLCC, PQFP, PDIP, QFP44 |
The devices operate from 2.7 V to 5.5 V.
They can run up to 33 MHz.
Each device provides four 8‑bit bidirectional I/O ports.
The microcontrollers support an idle mode and a power‑down mode.