ID82C55A

Overview

The ID82C55A is a CMOS Programmable Peripheral Interface manufactured by Renesas Electronics Corporation. It serves as a high-performance, static CMOS version of the industry-standard NMOS 8255A. The device features 24 programmable I/O pins organized into three ports (A, B, and C), which can be individually programmed in two groups of twelve. It operates with a single 5V power supply, supporting a maximum clock frequency of 8 MHz. The component is designed for industrial temperature ranges, functioning reliably between -40°C and +85°C. It offers full TTL compatibility and low standby power consumption.

Feature Summary

• Fully static CMOS design ensures low operating power and eliminates the need for pull-up resistors through bus hold circuitry.
• Pin-compatible with the legacy NMOS 8255A, allowing for direct upgrades to CMOS technology without board redesign.
• Supports fully TTL-compatible operation across the entire military temperature range.
• Provides enhanced control word read capability and direct bit set/reset functionality for flexible I/O management.

Applications

• General-purpose programmable I/O expansion for microprocessor systems
• Interface solutions for 80C86, 80C88, and other compatible microprocessors
• Industrial control systems requiring robust I/O handling in varying temperatures

Procurement Notes

Verify current availability status as distribution channels may report limited stock or discontinuation notices. Confirm RoHS compliance details and moisture sensitivity level requirements before procurement. Ensure the specific package type matches the target PCB footprint. Check for any recent product change notifications regarding labeling or packaging formats that might affect inventory management.

Selection Notes

Select this component when a CMOS upgrade from the 8255A is required for lower power consumption while maintaining pin compatibility. It is suitable for applications needing 24 programmable I/O lines with interrupt capabilities. Consider the CDIP-40 package constraints for through-hole mounting. Verify that the 8 MHz clock speed meets the system timing requirements.

Part Context

The ID82C55A belongs to the 82C55 series of programmable peripheral interfaces. This family represents the CMOS evolution of the classic 8255A standard, offering improved performance and power efficiency. It is part of Renesas' broader portfolio of interface ICs designed for legacy and modern microprocessor integration.

Replacement Considerations

The CS82C55A-5Z is a surface-mount alternative within the same series. For leaded through-hole replacements, verify IMS82C55AZ specifications. Ensure functional equivalence regarding voltage levels and timing characteristics when substituting.