CS82C55A-5Z

Overview

The CS82C55A-5Z is a CMOS Programmable Peripheral Interface (PPI) manufactured by Renesas Electronics. 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 8-bit ports (Port A, Port B, and Port C), which can be individually programmed into two groups of 12 bits. It supports three major modes of operation for flexible data handling. The component operates with a supply voltage range of 4.5 V to 5.5 V and supports maximum clock frequencies up to 8 MHz. It is housed in a 44-pin PLCC package and is fully TTL compatible.

Feature Summary

• Fully TTL compatible with bus hold circuitry eliminating the need for external pull-up resistors
• High-speed no wait state operation compatible with 5MHz and 8MHz microprocessors
• Direct bit set/reset capability for individual control of Port C lines
• Low standby power consumption with ICCSB of 10µA

Applications

• General purpose programmable I/O expansion for microprocessor systems
• Interfacing with 80C86 and 80C88 microprocessors
• Industrial control systems requiring parallel I/O expansion

Procurement Notes

Verify the specific ordering suffix to ensure the correct package type and temperature range are selected. Confirm RoHS compliance status if lead-free requirements are mandatory for the assembly process. Check moisture sensitivity level (MSL) ratings prior to storage and soldering to prevent damage during manufacturing.

Selection Notes

Select this component when a CMOS upgrade from the NMOS 8255A is required for lower power consumption without changing pinouts. Ensure the system clock does not exceed 8 MHz. Verify that the 44-pin PLCC package fits the PCB layout constraints. Consider the 4.5V to 5.5V operating voltage range for power supply design.

Part Context

The CS82C55A-5Z belongs to the 82C55A series of programmable peripheral interfaces. It is part of Renesas' portfolio of legacy-compatible logic devices designed to bridge older NMOS standards with modern CMOS efficiency. This series maintains pin compatibility with the original Intel 8255A while offering enhanced performance characteristics.

Replacement Considerations

The ISL82C55A is a functionally equivalent alternative from Intersil/Renesas. The NMOS 8255A is the predecessor but requires different power management. Verify pinout compatibility before substituting with other generic PPIs.