CS82C55A-596

Overview

The CS82C55A-596 is a CMOS Programmable Peripheral Interface manufactured by Renesas Electronics Corporation. It serves as a high-performance, low-power CMOS version of the industry-standard NMOS 8255A. The device features 24 programmable I/O pins organized into three ports (A, B, and C) with flexible configuration options. It operates at clock frequencies up to 8 MHz without wait states and maintains full TTL compatibility. Key electrical specifications include a supply voltage range of 4.5 V to 5.5 V and a maximum operating frequency of 8 MHz. The component supports direct bit set/reset capabilities and enhanced control word reading functions.

Feature Summary

• CMOS technology providing low standby power consumption and high-speed operation compatible with 5MHz and 8MHz processors.
• Pin-compatible design with the legacy NMOS 8255A, ensuring seamless integration into existing architectures.
• Full TTL compatibility across the operating temperature range, eliminating the need for external pull-up resistors.

Applications

• General-purpose parallel I/O expansion for microprocessor systems.
• Interface solutions for 80C86 and 80C88 microprocessors.
• Industrial control applications requiring reliable programmable peripheral interfaces.

Procurement Notes

Verify the specific suffix '596' against official Renesas documentation to confirm it denotes a military-grade or specific variant within the 82C55A family. Ensure that the ordering information matches the required package type and temperature range. Cross-reference the datasheet revision history to confirm current availability status and any recent manufacturing changes.

Selection Notes

Select this component when a CMOS upgrade from the 8255A is required for lower power consumption while maintaining pin compatibility. Consider the 8 MHz maximum clock speed for system timing requirements. Verify that the package style and thermal characteristics meet the target application's constraints before finalizing the design.

Part Context

The 82C55A is a widely used standard programmable peripheral interface originally developed for Intel microprocessors. Renesas produces the CMOS version using advanced SAJI process technology. This part belongs to the broader family of I/O expanders designed to bridge microprocessors with external devices in embedded systems.

Replacement Considerations

The CS82C55A-596 is functionally equivalent to the Intel 82C55A and NMOS 8255A due to pin compatibility. Verify if alternative manufacturers offer identical CMOS versions with matching electrical characteristics for supply chain diversification.