CMQ82C55AZ96

Overview

The CMQ82C55AZ96 is a CMOS Programmable Peripheral Interface (PPI) manufactured by Renesas Electronics Corporation. It provides 24 programmable I/O pins organized into three ports, compatible with the industry-standard 8255A architecture. The device operates on a single 5V supply within a voltage range of 4.5V to 5.5V and supports clock frequencies up to 8MHz for wait-state-free operation with 80C86/88 processors. It utilizes a 44-pin MQFP surface-mount package and is rated for industrial operating temperatures from 0°C to +70°C. The component features TTL compatibility and low standby power consumption.

Feature Summary

• Provides 24 general-purpose I/O lines configurable in two groups of 12.
• Supports direct bit set/reset capability for individual pin control.
• Ensures full TTL compatibility across the specified temperature range.
• Features static CMOS design for low power operation without external pull-up resistors.

Applications

• Peripheral interface for 80C86 and 80C88 microprocessor systems.
• Industrial control applications requiring parallel I/O expansion.
• General-purpose programmable input/output interfacing in embedded systems.

Procurement Notes

Verify component authenticity through authorized Renesas distributors or certified secondary market suppliers due to end-of-life status. Confirm moisture sensitivity level handling procedures during storage and assembly. Validate that the specific suffix denotes the correct package variant and temperature grade required for the target application environment before finalizing procurement.

Selection Notes

Select this component when a CMOS-compatible replacement for the NMOS 8255A is required with lower power consumption. Ensure the system design accommodates the 44-pin MQFP footprint and 5V logic levels. Verify that the 8MHz maximum clock speed meets the timing requirements of the host microprocessor bus interface.

Part Context

This part belongs to the 82C55A series of programmable peripheral interfaces. It represents the CMOS version of the legacy 8255A standard, offering enhanced performance and reduced power dissipation while maintaining pin compatibility. The series is designed for use with various Intel-compatible microprocessors.

Replacement Considerations

CMQ82C55AZ

FAQ

Is the CMQ82C55AZ96 compatible with the original NMOS 8255A?

Yes, it is pin-compatible with the NMOS 8255A and maintains functional equivalence while offering CMOS advantages.

What is the maximum operating frequency for wait-state-free operation?

The device supports high-speed, no-wait-state operation with 8MHz 80C86 and 80C88 microprocessors.

Does the device include interrupt output capabilities?

No, the CMQ82C55AZ96 does not feature an interrupt output capability.