IQ82C55AZ

Overview

The IQ82C55AZ 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 8255A, utilizing a self-aligned silicon gate process. The device provides 24 programmable I/O pins organized into three ports, supporting parallel interface expansion for microprocessor systems. It operates within 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-lead MQFP package with dimensions of 10x10 mm. It features TTL compatibility across the full industrial temperature range of -40°C to +85°C and includes bus hold circuitry to eliminate external pull-up resistors.

Feature Summary

• Static CMOS design ensures low operating power consumption while maintaining performance comparable to existing products.
• Fully TTL compatible over the complete military temperature range with integrated bus hold circuitry.
• Supports direct bit set/reset capability and enhanced control word read functionality.
• Provides 2.5 mA drive capability on all I/O ports for robust signal interfacing.

Applications

• Peripheral I/O expansion for 80C86 and 80C88 microprocessors
• General-purpose programmable I/O devices in industrial control systems
• Parallel interface modules requiring no wait state operation

Procurement Notes

Verify current availability status as this part may be subject to discontinuation notices. Confirm moisture sensitivity level (MSL 3) handling requirements during storage and assembly. Ensure the specific MQFP-44 package variant matches the target PCB footprint. Cross-reference manufacturer documentation for any product change notifications or labeling updates that may affect compliance.

Selection Notes

Select this component when a pin-compatible replacement for NMOS 8255A is required with lower power consumption. Verify that the 44-MQFP package fits the available board space. Ensure the system operates within the 4.5 V to 5.5 V supply range. Consider the industrial temperature rating if the application involves extreme environmental conditions. Check for interrupt output requirements as this specific variant configuration may differ from other series members.

Part Context

The IQ82C55AZ belongs to the 82C55A series of programmable peripheral interfaces. It is part of Renesas's portfolio of CMOS logic devices designed to replace older NMOS equivalents. The 'IQ' prefix typically denotes specific packaging or qualification variants within the Intersil/Renesas ecosystem. This component is functionally equivalent to the standard 82C55A but optimized for modern manufacturing processes.

Replacement Considerations

The CMQ82C55AZ is listed as a commercial replacement option, though it differs in temperature range (0°C to +70°C) and lacks interrupt outputs. Verify functional equivalence for critical applications. Other 82C55A derivatives in PLCC or CERDIP packages may serve as mechanical alternatives if pinout compatibility is maintained.