CQ82C55A96

Overview

The CQ82C55A96 is a CMOS Programmable Peripheral Interface (PPI) manufactured by Renesas Electronics Corporation. 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 parallel interface communication with microprocessors such as the 80C86 and 80C88. Key electrical specifications include a supply voltage range of 4.5V to 5.5V, an operating temperature range of 0°C to 70°C, and a maximum clock frequency of 8MHz. The unit is housed in a 44-MQFP package measuring 10x10mm.

Feature Summary

• Fully TTL compatible input and output logic levels across the full commercial temperature range.
• High-speed operation capability allowing no wait-state interfacing with 5MHz and 8MHz processors.
• Direct bit set/reset functionality for individual control of Port C lines without read-modify-write cycles.
• Low standby power consumption achieved through static CMOS design technology.

Applications

• General-purpose programmable I/O expansion for 8-bit and 16-bit microprocessor systems.
• Interfacing peripheral devices such as keyboards, displays, and ADCs in industrial control environments.
• Parallel data acquisition and output control in embedded instrumentation applications.

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to end-of-life status. Confirm specific ordering suffixes match required package and temperature grades. Request original datasheets and material compliance documentation prior to purchase. Validate that the supplier provides traceability records for legacy semiconductor components.

Selection Notes

Select this component when pin compatibility with the legacy 8255A is required alongside lower power consumption. Ensure the system operates within the specified 4.5V to 5.5V voltage range. Verify that the 44-MQFP surface mount package fits the PCB layout constraints. Consider the 0°C to 70°C commercial temperature rating against environmental requirements.

Part Context

This part belongs to the 82C55A family of programmable peripheral interfaces. It represents the CMOS evolution of the classic NMOS 8255A, offering identical pinouts and functionality with improved power efficiency. The series is widely recognized for its role in bridging microprocessors with external hardware in legacy and modern industrial designs.

Replacement Considerations

The CMQ82C55AZ96 is a documented commercial replacement variant within the same family. Both parts share the 44-MQFP package and 24 I/O configuration. Verify if the specific suffix indicates differences in moisture sensitivity or RoHS compliance before substitution.