IQ82C55A

Overview

The IQ82C55A is a CMOS Programmable Peripheral Interface (PPI) manufactured by Renesas Electronics Corporation, belonging to the 82C55A series. It provides 24 programmable I/O pins organized into three 8-bit ports (Port A, Port B, and Port C), which can be further grouped into two 12-bit sets. The device operates with a supply voltage range of 4.5V to 5.5V and supports clock frequencies up to 8MHz. It features TTL compatibility, low standby power consumption, and direct bit set/reset capability. The component is housed in a 44-pin MQFP package and is rated for an industrial operating temperature range of -40°C to +85°C.

Feature Summary

• Fully compatible with industry-standard NMOS 8255A pinouts while offering enhanced CMOS performance and lower power consumption.
• Supports multiple modes of operation including basic input/output, strobed input/output, and bidirectional bus handshaking.
• Features static CMOS design that eliminates the need for external pull-up resistors due to integrated bus hold circuitry.

Applications

• Parallel interface expansion for 80C86 and 80C88 microprocessor systems.
• General-purpose programmable I/O control in industrial automation equipment.
• Embedded system designs requiring flexible digital input and output port configuration.

Procurement Notes

Verify the specific suffix 'Z' against official Renesas documentation to confirm if it denotes lead-free compliance or packaging variations, as suffixes can indicate distinct manufacturing attributes. Confirm current availability status, as this part may be subject to discontinuation notices. Ensure that the 44-MQFP package dimensions match your PCB footprint requirements before finalizing procurement decisions.

Selection Notes

Select the IQ82C55A when a CMOS version of the 8255A PPI is required for systems needing low power consumption and high-speed operation up to 8MHz. Ensure the design environment supports the 4.5V to 5.5V supply voltage range. Consider the 44-pin MQFP package constraints during layout. Verify that the industrial temperature range of -40°C to +85°C meets the operational requirements of the target application environment.

Part Context

The IQ82C55A is part of the broader 82C55A family of programmable peripheral interfaces produced by Renesas (formerly Intersil). This family serves as a CMOS upgrade to the legacy NMOS 8255A, providing equivalent functionality with improved electrical characteristics. It is designed to interface seamlessly with various microprocessors, maintaining pin compatibility while reducing power dissipation through advanced silicon gate CMOS processes.

Replacement Considerations

The ID82C55A is a documented alternative within the same product family, offering similar functional specifications but typically in a CDIP-40 through-hole package. Verify pinout compatibility and package dimensions when substituting, as physical mounting differences exist between the MQFP and DIP formats. Check datasheets for any minor electrical parameter deviations between the surface-mount and through-hole variants.