IMQ82C55AZ

Overview

The IMQ82C55AZ is a CMOS Programmable Peripheral Interface manufactured by Renesas Electronics Corporation. It provides 24 programmable I/O pins organized into three 8-bit ports (Port A, Port B, and Port C). The device operates on a single 5V supply with a voltage range of 4.5V to 5.5V. It supports clock frequencies up to 8MHz for high-speed, no-wait-state operation. The component is housed in a 44-pin MQFP surface-mount package and is rated for commercial operating temperatures ranging from 0°C to +70°C.

Feature Summary

• Offers 24 individually programmable I/O lines grouped into three ports for flexible peripheral control.
• Supports multiple modes of operation including basic input/output, strobed input/output, and bidirectional bus handshaking.
• Features direct bit set/reset capability allowing individual port bits to be modified without affecting other pins.
• Ensures TTL compatibility across the full operating temperature range without requiring external pull-up resistors.

Applications

• Parallel interface expansion for microprocessor systems
• General-purpose I/O interfacing in industrial control equipment
• Peripheral management in embedded computing architectures

Procurement Notes

Verify the specific suffix 'IMQ' against official Renesas documentation to confirm the exact package type and temperature rating. Datasheets often list variants like IQ82C55AZ or IMS82C55AZ; ensure the part number matches the required physical footprint and environmental specifications before procurement.

Selection Notes

Select this component when a parallel interface solution is required for 8-bit microprocessors such as the 80C86 or 80C88. Ensure the design accommodates the 44-pin MQFP package dimensions and that the system power supply remains within the 4.5V to 5.5V range for reliable operation.

Part Context

This part belongs to the 82C55A family of programmable peripheral interfaces. It serves as a high-performance CMOS version of the industry-standard NMOS 8255A. The series is designed for compatibility with various microprocessors while offering lower standby power consumption compared to older bipolar technologies.

Replacement Considerations

Functionally equivalent parts include the IQ82C55AZ and CS82C55AZ. Verify pinout compatibility and package dimensions before substitution, as different suffixes may indicate variations in packaging or temperature ranges rather than electrical performance.