IS82C55A96

Overview

The IS82C55A96 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, a maximum clock frequency of 8MHz, and an operating temperature range from -40°C to +85°C. The component is housed in a 44-lead Plastic Leadless Chip Carrier (PLCC) package.

Feature Summary

• Fully TTL compatible across the full military temperature range without requiring external pull-up resistors due to integrated bus hold circuitry.
• High-speed operation capability supporting 5MHz and 8MHz clocks with no wait states required for 80C86 and 80C88 processors.
• Provides direct bit set/reset capability for individual control of Port C lines and enhanced control word read functionality.

Applications

• General-purpose programmable I/O expansion for 80C86 and 80C88 microprocessor systems.
• Industrial control interfaces requiring robust TTL compatibility and low standby power consumption.
• Embedded systems utilizing parallel data transfer between microcontrollers and peripheral devices.

Procurement Notes

Verify the specific suffix '96' against official Renesas documentation to confirm package type and moisture sensitivity level details. Confirm RoHS compliance status as historical Intersil/Renesas products may have varying environmental declarations depending on the manufacturing date code. Check for End-of-Life notifications or Product Change Notices that may affect long-term availability or pinout consistency.

Selection Notes

Select this component when a CMOS upgrade to the legacy 8255A is required for lower power consumption while maintaining pin compatibility. Ensure the design environment supports PLCC-44 surface mount assembly. Verify that the system logic levels are compatible with the specified 4.5V to 5.5V supply range and that the 8MHz maximum clock speed meets the processor's timing requirements.

Part Context

The IS82C55A belongs to the 82C55A family of CMOS Programmable Peripheral Interfaces originally developed by Intersil and now produced by Renesas Electronics. This series represents the static CMOS evolution of the classic NMOS 8255A, offering significantly reduced power dissipation while preserving functional equivalence. The 'IS' prefix typically denotes Intersil branding within the Renesas portfolio, indicating its heritage in high-performance interface solutions.

Replacement Considerations

The IMS82C55AZ is a functionally equivalent part number within the same family, often sharing identical electrical characteristics and pinouts. Both components serve as CMOS replacements for the NMOS 8255A. Verify package variations and specific suffix designators to ensure mechanical compatibility during replacement.