Part Number : 80C51
Function : 8-bit Microcontroller
Package : DIP 40 Pin Type
Maker : Philips Electronics
Pinouts : 
Description :
The Philips 80C51 / 87C51 / 80C52 / 87C52 is a high-performance static 80C51 design fabricated with Philips high-density CMOS technology with operation from 2.7 V to 5.5 V.
The 8xC51 and 8xC52 contain a 128 ×8 RAM and 256 ×8 RAM respectively, 32 I/O lines, three 16-bit counter/timers, a six-source, four-priority level nested interrupt structure, a serial I/O port for either multi-processor communications, I/O expansion or full duplex UART, and on-chip oscillator and clock circuits.
4 K/8 K OTP/ROM low voltage (2.7 V–5.5 V), low power, high speed (33 MHz), 128/256 B RAM
Features :
• 12-clock operation with selectable 6-clock operation
• Memory addressing capability
– 64 kbytes ROM and 64 kbytes RAM
• Power control modes:
– Clock can be stopped and resumed
– Idle mode
– Power-down mode
• CMOS and TTL compatible
Datasheet PDF Download : 
Others datasheet of same file :
P-80C52, P80C51SBAA, P80C51SBBB, P80C51SBPN