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The 8253 is a programmable interval timer/counter specifically designed for use with the IntelTM Micro-computer systems. Its function is that of a general-purpose, multi-timing element that can be treated as an array of 1/O ports in the system software The 8253 solves one of the most common problems in any microcomputer system, the generation of accurate time delays under software control.
8253 Pinout
8253 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1-8 | D7-D0 | Port D Pin |
| 9 | CLK 0 | Clock Pin 0 |
| 10 | OUT 0 | Output Pin 0 |
| 11 | GATE 0 | Gate Pin 0 |
| 12 | GND | Ground Pin |
| 13 | OUT 1 | Output Pin 1 |
| 14 | GATE 1 | Gate Pin 1 |
| 15 | CLK 1 | Clock Pin 01 |
| 16 | GATE 2 | Gate Pin 2 |
| 17 | OUT 2 | Output Pin 2 |
| 18 | CLK 2 | Clock Pin 02 |
| 19 | A0 | Counter Pin 0 |
| 20 | A1 | Counter Pin 1 |
| 21 | CS’ | Chip Select Pin |
| 22 | RD’ | Read Data Pin |
| 23 | WR’ | Write Pin |
| 24 | VCC | Collector Supply Pin |
8253 Key Features
- MCS-85TM Compatible 8253-5
- 3 Independent 16-Bit Counters
- DC to 2.6 MHz
- Programmable Counter Modes
- Count Binary or BCD
- Single +5V Supply
You can download this datasheet for 8253 Programmable Interval Timer – Datasheet from the link given below:
