This document describes the features and characteristics of Philips Semiconductors' 87L51FA and 87L51FB single-chip 8-bit microcontrollers.
The 87L51FA/87L51FB microcontrollers are single‑chip 3.0 V CMOS devices derived from the 80C51 family. They offer 8 KB (FA) or 16 KB (FB) EPROM, a 256 × 8 volatile RAM, four 8‑bit I/O ports, three 16‑bit timers, a programmable counter array (PCA) and a full‑duplex enhanced UART. The devices operate from 3.0 V to 4.5 V Vcc and support idle, power‑down and ONCE (on‑circuit emulation) modes for low‑power applications.
The datasheet lists several package options, including 40‑Pin Plastic Dual In‑line, 44‑Pin Plastic Leaded Chip Carrier and 40‑Pin Ceramic Dual In‑line packages. Electrical specifications cover operating temperature ranges from –40 °C to +85 °C, maximum I/O pin current of 15 mA, and an active‑mode current of 22 mA at 20 MHz.
| Supply voltage range | 3.0 V to 4.5 V Vcc |
|---|---|
| EPROM memory (FA) | 8 KB (8 k × 8) |
| EPROM memory (FB) | 16 KB (16K × 8) |
| Internal RAM | 256 × 8 volatile data memory |
| I/O ports | Four 8‑bit ports |
| 16‑bit timers | Three |
| Programmable Counter Array | Included |
| UART | Full‑duplex enhanced |
| Package options | 40‑Pin Plastic DIP, 44‑Pin Plastic Leaded Chip Carrier, 40‑Pin Ceramic DIP |
| Operating temperature range | -40 °C to +85 °C |
| Maximum I/O pin current | 15 mA per pin |
The devices operate from 3.0 V to 4.5 V Vcc.
It provides four 8‑bit I/O ports.
Available packages include a 40‑Pin Plastic Dual In‑line Package, a 44‑Pin Plastic Leaded Chip Carrier, and a 40‑Pin Ceramic Dual In‑line Package.