IMS82C55AZ96

Overview

The IMS82C55AZ96 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 configured in two groups of 12 bits. It operates with a supply voltage range of 4.5 V to 5.5 V and supports clock frequencies up to 8 MHz. The component is housed in a 44-pin Plastic Leadless Chip Carrier (PLCC) package with dimensions of 16.58 mm x 16.58 mm. It is designed for TTL compatibility and includes bus hold circuitry.

Feature Summary

• Fully compatible with NMOS 8255A pinouts while offering enhanced CMOS performance characteristics.
• Provides direct bit set/reset capability for individual control of Port C lines without read-modify-write cycles.
• Features enhanced control word read capability allowing the CPU to verify the current mode configuration.
• Incorporates bus hold circuitry on all I/O ports to eliminate the need for external pull-up resistors.

Applications

• General-purpose parallel interface expansion for 80C86 and 80C88 microprocessor systems.
• Industrial control applications requiring programmable I/O in harsh environments.
• Embedded systems needing low-power static operation with TTL-level signal compatibility.

Procurement Notes

Verify the specific suffix 'Z96' against official Renesas documentation to confirm packaging details such as reel or cut tape specifications. Confirm moisture sensitivity level (MSL 3) handling requirements prior to assembly. Ensure the design accounts for the 44-PLCC footprint dimensions. Check for any product change notices regarding lead-free annealing processes or RoHS compliance status updates.

Selection Notes

Select this component when a drop-in replacement for the 8255A is required with lower power consumption and higher speed capabilities. Consider the 44-PLCC package if surface-mount technology is preferred over through-hole DIP options. Verify that the system requires the specific interrupt output configuration associated with this variant compared to non-interrupt versions like the CMS prefix.

Part Context

This part belongs to the 82C55A family of programmable peripheral interfaces. It is functionally equivalent to the Intersil X82C55 but utilizes the advanced SAJI IV process. The IMS prefix typically denotes industrial temperature range variants in some Renesas lineages, though specific thermal ratings should be confirmed via datasheet. It represents the CMOS evolution of the classic 8255 architecture.

Replacement Considerations

The CS82C55AZ96 is a potential alternative within the same package and family. The CMS82C55AZ96 offers similar electrical characteristics but may lack interrupt outputs. Cross-reference the specific interrupt functionality requirements before substituting with non-interrupt variants.