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80 Series
82C55 Datasheet - 82C55 Programmable Peripheral Interface Datasheet
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 Layout
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 |
| 27-34 | D0-D7 - Data Bus |
| 35 | RESET - Reset Input |
| 36 | WR - Write (Active Low) |
| 37-40 | PA4-PA7 - Port A |
Dimensional Drawing
Technical Data
