80 Seties

82C55 - CMOS Programmable Peripheral Interface

Photograph

Features Pin Compatible with NMOS 8255A 24 Programmable I/O Pins Fully TTL Compatible High Speed, No "Wait State" Operation with 5MHz Direct Bit Set/Reset Capability Enhanced Control Word Read Capability L7 Process 2.5mA Drive Capability on All I/O Ports Low Standby Power - 10µA

Pin Description Pin Number Description 1-4 PA0-PA3 - Port A 5 RD - Read (Active Low) 6 CS - Chip Select (Active Low) 7 GND - Ground 8 A0 - Address Input 9 A1 - Address Input 10-17 PC0-PC7 - Port C 18-25 PB0-PB7 - Port B 26 Vcc - +5V Power Supply Input 27-34 D0-D7 - Data Bus 35 RESET - Reset Input 36 WR - Write (Active Low) 37-40 PA4-PA7 - Port A

Pin Layout Dimensional Drawing

Technical Data Data Sheet Intersil - Data Sheet for 82C55A Application Notes Intersil - 82C55A Address to Read/Write Set Up Time