CMS82C55AZ96

Overview

The CMS82C55AZ96 is a CMOS Programmable Peripheral Interface (PIA) manufactured by Renesas Electronics Corporation, formerly Intersil. 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, allowing flexible configuration for various microprocessor systems. It operates on a single 5V power supply with a voltage range of 4.5 V to 5.5 V and supports clock frequencies up to 8 MHz. Designed for compatibility with 80C86, 80C88, and other microprocessors, it ensures low standby power consumption while maintaining TTL compatibility across its operating temperature range.

Feature Summary

• Fully static CMOS design eliminates wait states and reduces power consumption significantly compared to NMOS equivalents.
• Pin-compatible with the legacy NMOS 8255A, facilitating direct upgrades in existing designs without board layout changes.
• Supports direct bit set/reset capability and enhanced control word read functionality for precise I/O management.
• Incorporates bus hold circuitry to maintain signal integrity without requiring external pull-up resistors.

Applications

• General-purpose programmable I/O expansion for 8-bit and 16-bit microprocessor systems.
• Interface modules for industrial control applications requiring reliable parallel data transfer.
• Legacy system modernization projects replacing obsolete NMOS components with CMOS alternatives.

Procurement Notes

Verify the specific suffix 'Z96' against official Renesas documentation to confirm package type and temperature grade. Confirm RoHS compliance status through current datasheets, as manufacturing processes may evolve. Check for end-of-life notifications or product discontinuance alerts prior to finalizing procurement plans. Ensure sourcing channels provide genuine parts with traceable origin from Renesas or authorized distributors.

Selection Notes

Select this component when a drop-in replacement for the 8255A is required with improved power efficiency and higher speed capabilities. Consider the PLCC-44 package constraints if space is limited. Evaluate the 8 MHz maximum clock frequency against system timing requirements. Verify that the commercial temperature range meets the environmental conditions of the target application.

Part Context

The CMS82C55AZ96 belongs to the 82C55A family of programmable peripheral interfaces. This series represents the CMOS evolution of the classic 8255A standard, offering faster operation and lower power draw. It is part of Renesas's broader portfolio of interface ICs designed to support legacy microprocessor architectures while providing modern performance benefits.

Replacement Considerations

The CMS82C55AZ96 is functionally equivalent to the Intel 82C55A and compatible with the NMOS 8255A. Other variants within the 82C55A family, such as IQ82C55AZ96, may offer different temperature ranges or packaging options. Verify pinout compatibility before substituting with other manufacturers' CMOS PIA devices.