CS82C55AZ

Overview

The CS82C55AZ is a CMOS Programmable Peripheral Interface (PPI) manufactured by Renesas Electronics Corporation, belonging to the 82C55A series. It provides 24 programmable I/O pins organized into three 8-bit ports. The device operates on a single 5V supply with a voltage range of 4.5V to 5.5V and supports clock frequencies up to 8MHz. It features TTL compatibility, open-drain outputs with 2.5mA drive capability, and interrupt generation. The component is housed in a 44-pin PLCC package and is rated for commercial temperature operation from 0°C to +70°C.

Feature Summary

• Provides 24 individually programmable I/O lines grouped into three ports for flexible peripheral interfacing.
• Supports multiple operating modes including basic input/output, strobed input/output, and bidirectional bus handshaking.
• Features direct bit set/reset capability for individual port pin control without affecting other pins.
• Ensures full TTL compatibility across the operating temperature range with bus hold circuitry.

Applications

• Interfacing with 80C86 and 80C88 microprocessors in industrial control systems.
• Peripheral expansion for embedded instrumentation and measurement devices.
• General-purpose parallel I/O expansion in computer terminal applications.

Procurement Notes

Verify end-of-life status and discontinuance notifications prior to design implementation. Confirm moisture sensitivity level handling requirements during storage and assembly. Ensure the specific suffix matches the required package type and temperature grade. Check for available replacement components if long-term supply is critical for production.

Selection Notes

Select this component when a CMOS-compatible PPI with 8MHz performance is required for 5V logic systems. Compare against the CS82C55A-5Z for lower speed variants or IQ82C55AZ for MQFP packaging options. Verify that the 44-pin PLCC footprint aligns with the target PCB layout constraints and thermal management needs.

Part Context

The CS82C55AZ is part of the broader 82C55A family of programmable interface chips. It serves as a high-performance CMOS alternative to older NMOS versions like the 8255A. The device maintains pin compatibility while offering reduced power consumption and higher speed operation suitable for modern microprocessor-based designs.

Replacement Considerations

Consider the CS82C55A-5Z for applications requiring lower maximum clock speeds. Evaluate the IQ82C55AZ for surface-mount MQFP packaging requirements instead of PLCC. Generic 82C55A equivalents may be used if pinout and electrical specifications are verified.