CMQ82C55AZ

Overview

The CMQ82C55AZ is a CMOS Programmable Peripheral Interface manufactured by Renesas Electronics Corporation. It provides 24 programmable I/O pins organized into three 8-bit ports, functioning as an I/O expander with parallel interface capabilities. The device operates on a single 4.5V to 5.5V supply and supports a maximum clock frequency of 8 MHz. It features open-drain outputs with a drive capability of 2.5mA per pin. Packaged in a 44-MQFP (10x10) surface-mount format, it is designed for commercial temperature ranges from 0°C to +70°C.

Feature Summary

• Provides 24 individually programmable I/O lines grouped into three 8-bit ports for flexible peripheral control.
• Features fully static CMOS design ensuring low standby power consumption and TTL compatibility without external pull-up resistors.
• Supports direct bit set/reset operations and enhanced control word reading for efficient microprocessor integration.

Applications

• General-purpose programmable I/O expansion for 80C86 and 80C88 microprocessors.
• Industrial control systems requiring reliable parallel interface connectivity.
• Embedded applications needing low-power I/O buffering in commercial environments.

Procurement Notes

Verify component authenticity through authorized Renesas distributors or certified suppliers. Confirm the specific manufacturing date code and RoHS compliance status prior to procurement. As this part may be subject to obsolescence notices, check for active production status or recommended replacement alternatives to ensure long-term supply chain stability.

Selection Notes

Select the CMQ82C55AZ when a 44-pin MQFP package is required for space-constrained designs. Ensure the application environment remains within the 0°C to +70°C commercial temperature range. Verify that the system voltage aligns with the 4.5V to 5.5V operating specification and that the 2.5mA output drive current meets the load requirements.

Part Context

This component belongs to the 82C55A series of CMOS Programmable Peripheral Interfaces. It serves as a high-performance, low-power alternative to legacy NMOS versions, maintaining pin compatibility while offering improved speed and reduced power consumption. The series is widely recognized for its standard configuration and ease of integration with various microprocessor architectures.

Replacement Considerations

Check for official Renesas EOL notifications. Potential substitutes include other variants within the 82C55A family such as IQ82C55AZ or IS82C55AZ, provided package and temperature specifications match the design requirements.