IS82C54

Programmable Timers And Oscillators Overview

The IS82C54 is a high-performance CMOS programmable interval timer manufactured using an advanced 2-micron CMOS process. It contains three independently programmable and functional 16-bit counters, each capable of handling clock input frequencies up to 8 MHz. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports six programmable timer modes. It features a maximum propagation delay of 100 ns and is housed in a 28-pin PLCC package. The component is designed for compatibility with industry-standard microprocessors.

Programmable Timers And Oscillators Feature Summary

• Three independent 16-bit counters with 8 MHz clock frequency capability
• Six programmable timer modes for flexible timing configurations
• CMOS output type with 4.5 V to 5.5 V operating voltage range
• 100 ns maximum propagation delay for high-speed performance

Programmable Timers And Oscillators Applications

• Compatible with Intersil 80C86, 80C88, and 80C286 CMOS microprocessors
• Industrial control systems requiring precise interval timing
• General-purpose peripheral programming counters

Programmable Timers And Oscillators Procurement Notes

Verify the specific suffix (e.g., -96, -10Z) as it denotes package type, speed grade, or environmental rating. Confirm RoHS compliance status via the official datasheet, as legacy variants may differ. Check current lifecycle status, as many 82C54 derivatives are discontinued or subject to limited availability.

Programmable Timers And Oscillators Selection Notes

Select based on required clock frequency; standard IS82C54 supports 8 MHz, while -10 variants support 10 MHz. Ensure the package style (PLCC-28) matches the PCB footprint. Verify temperature range requirements against industrial (-40°C to +85°C) or commercial specifications found in the specific variant datasheet.

Programmable Timers And Oscillators Part Context

The IS82C54 belongs to the 82C54 family of CMOS programmable timers, serving as an enhanced version of the NMOS 8253. It maintains pin and instruction compatibility with the 8254 while offering improved speed and lower power consumption through CMOS technology. This series is widely used in legacy PC architectures and embedded timing applications.

Programmable Timers And Oscillators Replacement Considerations

Direct substitutes include other 82C54-compatible CMOS timers from manufacturers such as Intel (i82C54), AMD (Am72C54), or National Semiconductor (LM75C54). Verify pinout compatibility and electrical parameters before substitution.