IS82C55A

Overview

The IS82C55A is a high-performance CMOS Programmable Peripheral Interface (PPI) manufactured by Renesas Electronics Corporation. It serves as the CMOS equivalent of the industry-standard NMOS 8255A, offering pin compatibility while utilizing a self-aligned silicon gate process for reduced power consumption. The device provides 24 programmable I/O pins organized into three 8-bit ports, supporting parallel interface connections. It operates within a supply voltage range of 4.5V to 5.5V and supports data rates up to 8MHz with no wait states. Key electrical characteristics include open-drain outputs with a drive capability of 2.5mA per pin and low standby current of 10µA.

Feature Summary

• Fully TTL compatible across the full military temperature range without requiring external pull-up resistors due to integrated bus hold circuitry.
• Supports direct bit set/reset operations and enhanced control word read capabilities for flexible peripheral management.
• Features static CMOS design ensuring low operating power and high-speed operation compatible with 80C86 and 80C88 microprocessors.

Applications

• General-purpose programmable I/O expansion in embedded systems using 80C/82C microprocessors.
• Industrial control interfaces requiring TTL-compatible parallel communication.
• Military applications necessitating operation across extended temperature ranges with low power consumption.

Procurement Notes

Verify component authenticity through authorized distributors or official Renesas channels. Confirm RoHS compliance status and moisture sensitivity level (MSL 3) prior to assembly. Check for specific ordering suffixes that may indicate package variations or lead-free processing. Ensure storage conditions adhere to humidity sensitivity guidelines to prevent damage before soldering.

Selection Notes

Select the IS82C55A when a CMOS upgrade from the legacy 8255A is required for lower power consumption without changing the PCB footprint. Ensure the system design accommodates the 4.5V to 5.5V supply voltage range. Verify that the 2.5mA output drive current meets the load requirements of the connected peripherals. Consider the PLCC-44 package dimensions if surface mount technology is specified for the target application.

Part Context

The IS82C55A belongs to the 82C55A series of programmable peripheral interfaces. It is part of Renesas' portfolio of interface ICs designed to bridge microprocessors with external devices. This component represents the evolution of the classic 8255A architecture into a modern CMOS process, maintaining functional equivalence while improving efficiency and performance metrics for contemporary electronic designs.

Replacement Considerations

The IS82C55A is functionally pin-compatible with the NMOS 8255A. Other CMOS variants such as the IMS82C55AZ or CS82C55A-5Z offer similar specifications but may differ in package type or manufacturing origin. Verify exact pinout and electrical parameters against the original design requirements before substituting.