CP82C55A-5

Overview

The Renesas CP82C55A-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 8-bit ports (Port A, Port B, and Port C), which can be configured in two groups of 12 bits. The device supports parallel interface connections with TTL compatibility across its full operating range. It operates within a supply voltage range of 4.5V to 5.5V and features a maximum clock frequency of 8MHz. The component is housed in a 40-pin Dual In-Line Package (DIP) and is rated for commercial temperature operation from 0°C to +70°C.

Feature Summary

• Fully pin-compatible with the legacy NMOS 8255A while offering enhanced CMOS performance characteristics.
• Supports direct bit set/reset capability for individual control of Port C lines without read-modify-write cycles.
• Features bus hold circuitry that eliminates the need for external pull-up resistors on unused inputs.
• Provides low standby power consumption with an ICCSB of 10µA.

Applications

• Interfacing with 80C86 and 80C88 microprocessors in industrial control systems.
• General-purpose programmable I/O expansion in embedded computing architectures.
• Legacy system upgrades requiring CMOS replacement for NMOS peripheral interfaces.

Procurement Notes

Verify the specific suffix designation against official Renesas documentation, as the provided model lacks the standard 'Z' suffix often associated with RoHS compliance in this series. Confirm package authenticity and moisture sensitivity level handling requirements prior to assembly. Ensure the source document explicitly identifies the manufacturer as Renesas Electronics Corporation or Intersil to validate part lineage.

Selection Notes

Select this component when a drop-in replacement for the 8255A is required with lower power consumption and higher speed capabilities. Ensure the application environment remains within the commercial temperature range of 0°C to +70°C. Verify that the system design accommodates the 40-pin DIP footprint and that the 5V logic levels match the target microprocessor bus specifications.

Part Context

The CP82C55A belongs to the 82C55 family of programmable peripheral interfaces manufactured by Renesas Electronics (formerly Intersil). This family represents the CMOS evolution of the classic 8255A standard, offering improved electrical characteristics while maintaining functional equivalence. The 'CP' prefix typically denotes the commercial temperature grade and plastic DIP packaging variant within the broader product line.

Replacement Considerations

The ID82C55A serves as a functionally equivalent alternative within the same manufacturer portfolio. Both devices share identical pinouts and logical operations. Verify that the substitute part meets the specific temperature and voltage requirements of the original design before implementation.