IS82C55A-5Z

Overview

The IS82C55A-5Z is a CMOS Programmable Peripheral Interface (PPI) manufactured by Renesas Electronics. It provides 24 programmable I/O pins organized into three 8-bit ports, compatible with the industry-standard NMOS 8255A. The device operates on a single 5V supply within a voltage range of 4.5V to 5.5V and supports parallel interface connections. It features open-drain outputs with a drive capability of 2.5mA per pin. The component is housed in a 44-pin PLCC package designed for surface mount technology. It functions at clock speeds up to 5MHz and operates reliably across an industrial temperature range from -40°C to +85°C.

Feature Summary

• Fully TTL compatible logic levels ensure seamless integration with standard digital systems without requiring external pull-up resistors due to integrated bus hold circuitry.
• Direct bit set/reset capability allows individual control of specific I/O lines, enhancing flexibility for complex peripheral management tasks.
• Enhanced control word read capability improves system reliability by verifying configuration states during operation.

Applications

• General-purpose programmable I/O expansion for microprocessor-based embedded systems
• Interface solutions for legacy 80C86 and 80C88 microprocessor architectures
• Industrial control panels requiring robust parallel data handling

Procurement Notes

Verify authenticity through authorized distributors as the component may be subject to discontinuation notices. Confirm RoHS compliance status and lead-free annealing specifications against current datasheets. Check moisture sensitivity level (MSL 3) requirements for storage and handling prior to assembly to prevent package damage during reflow soldering processes.

Selection Notes

Select this component when a CMOS upgrade to the NMOS 8255A is required for lower power consumption while maintaining pin compatibility. Ensure the design accommodates the 44-pin PLCC footprint and 5V logic levels. Verify that the 2.5mA output drive current meets the load requirements of the connected peripherals without additional buffering.

Part Context

This part belongs to the 82C55A series of programmable peripheral interfaces. It represents the CMOS version of the classic 8255A, offering similar functionality with improved power efficiency and speed. The 'IS' prefix typically denotes Intersil/Renesas manufacturing, while the '-5Z' suffix indicates specific packaging and environmental compliance variations.

Replacement Considerations

The IS82C55A-5Z is functionally pin-compatible with the NMOS 8255A. Other CMOS equivalents such as the Intel 82C55 or generic 82C55 variants may serve as substitutes if electrical characteristics like drive current and operating voltage ranges are verified to match the original design constraints.