CS82C55A-5

Overview

The Renesas CS82C55A-5 is a CMOS Programmable Peripheral Interface (PPI) designed as a high-performance, low-power alternative to the industry-standard NMOS 8255A. It provides 24 programmable I/O pins organized into three ports (A, B, and C), which can be individually configured in two groups of twelve. The device supports parallel interface connections with open-drain outputs capable of sourcing or sinking up to 2.5mA per pin. Operating within a voltage range of 4.5V to 5.5V, it features a maximum clock frequency of 8MHz and operates reliably across an industrial temperature range of -40°C to +85°C. Packaged in a 44-pin PLCC format, it ensures TTL compatibility and static CMOS operation for minimal standby power consumption.

Feature Summary

• Fully compatible with NMOS 8255A pinouts while offering enhanced CMOS performance characteristics
• Supports direct bit set/reset capability and enhanced control word read functionality
• Eliminates the need for external pull-up resistors through integrated bus hold circuitry
• Provides high-speed operation without wait states when interfacing with 5MHz and 8MHz microprocessors

Applications

• Interfacing with 80C86, 80C88, and other compatible microprocessor systems
• General-purpose programmable I/O expansion in industrial control environments
• Embedded systems requiring low standby power and TTL-compatible logic levels

Procurement Notes

Verify that the specific part number suffix corresponds to the required moisture sensitivity level and lead-free status. Confirm package integrity upon receipt, as PLCC components are sensitive to mechanical stress during handling. Ensure storage conditions adhere to the specified humidity sensitivity等级 requirements to prevent damage before soldering.

Selection Notes

Select this component when a drop-in replacement for the legacy 8255A is required with improved power efficiency. The CS82C55A-5 is suitable for designs needing robust TTL compatibility across wide temperature variations. Consider the 44-lead PLCC package constraints regarding PCB layout space and thermal dissipation capabilities for the final application design.

Part Context

This component belongs to the 82C55A series of CMOS Programmable Peripheral Interfaces manufactured by Renesas Electronics. It serves as a modernized version of the classic 8255A standard, utilizing advanced silicon gate CMOS processes to deliver higher speed and lower power consumption while maintaining functional equivalence with existing industry standards.

Replacement Considerations

The IS82C55A-5 is a verified equivalent part number from the same manufacturer family. Both devices share identical pinouts and functional specifications, allowing for direct substitution in existing designs without circuit modification.