82C54 is a high performance CMOS programmable interval timer manufactured by Harris using an advanced 2 micron CMOS process. The 82C54 has three independently programmable and functional 16-bit counters, each capable of handling clock input frequencies of up to 8MHz (82C54) or 10MHz (82C54-10) or 12MHz (82C54-12). The high speed and industry standard configuration of the 82C54 make it compatible with the Harris 80C86, 80C88, and 80C286 CMOS microprocessors along with many other industry standard processors. Six programmable timer modes allow the 82C54 to be used as an event counter, elapsed time indicator, programmable one-shot, and many other applications. Static CMOS circuit design insures low power operation.
The Harris 82C54 is a high‑performance CMOS programmable interval timer compatible with the NMOS 8254. It offers three independent 16‑bit counters, a wide clock input range, and full TTL compatibility, making it suitable for a variety of microcomputer applications.
This manual covers ordering information, pin descriptions, functional and operational details, and step‑by‑step programming procedures, including control word formats, counter latch commands, and read‑back operations. It also lists temperature ranges, package options, and power requirements.
| Clock Input Frequency | 8 MHz to 12 MHz |
|---|---|
| Power Supply | 5 V (single supply) |
| Temperature Range (PDIP, CERDIP, SOIC) | 0 °C to +70 °C |
| Temperature Range (PLCC) | -40 °C to +85 °C |
| Temperature Range (Extended) | -55 °C to +125 °C |
| Number of Counters | Three independent 16‑bit counters |
| Compatibility | Fully TTL compatible, compatible with Harris 80C86, 80C88, 80C286 |
The 82C54 supports clock input frequencies from 8 MHz up to 12 MHz.
It contains three independently programmable 16‑bit counters.
The device operates from a single 5 V power supply.