IS82C50A-5Z

Overview

The IS82C50A-5Z is a CMOS Programmable Peripheral Interface manufactured by Renesas Electronics Corporation. It serves as a high-performance, low-power alternative to 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). It supports parallel interface communication with microprocessors such as the 80C86 and 80C88. Key electrical characteristics include TTL compatibility across the full military temperature range, static CMOS design for low standby power consumption, and operation speeds up to 5 MHz without wait states. The component is housed in a 44-pin PLCC package.

Feature Summary

• Fully pin-compatible with the legacy NMOS 8255A standard while offering enhanced CMOS performance.
• Provides direct bit set/reset capability for individual control of Port C lines.
• Incorporates bus hold circuitry to eliminate the need for external pull-up resistors.
• Supports multiple modes of operation including basic input/output, strobed input/output, and bidirectional bus transfer.

Applications

• General-purpose programmable I/O expansion for 8-bit and 16-bit microprocessor systems.
• Interface solutions for industrial control applications requiring robust TTL compatibility.
• Embedded system designs utilizing 80C86 or 80C88 processor architectures.

Procurement Notes

Verify component authenticity through authorized distributors or official Renesas channels. Confirm RoHS compliance status and anneal specifications against current datasheets. Check for end-of-life notifications or discontinuance alerts prior to procurement planning. Ensure moisture sensitivity level handling procedures are followed during storage and assembly.

Selection Notes

Select this component when a drop-in replacement for the 8255A is required with lower power consumption. Consider the PLCC-44 package constraints for PCB layout. Evaluate thermal requirements for military temperature ranges if operating outside commercial limits. Verify voltage levels match the target microprocessor bus specifications.

Part Context

The IS82C50A-5Z belongs to the 82C55A family of CMOS Programmable Peripheral Interfaces. This series represents the CMOS evolution of the classic 8255A, maintaining functional equivalence while improving power efficiency and speed. It is part of Renesas' broader portfolio of interface ICs designed for legacy and modern microprocessor integration.

Replacement Considerations

The IS82C50A-5Z is functionally equivalent to the Intel 82C55A and compatible with the NMOS 8255A. Other valid substitutes include the AMD Am7C55A or generic 82C55A variants from other manufacturers, provided they share the same pinout and electrical characteristics.