71342SA55PF

Overview

The Renesas Electronics Corporation 71342SA55PFI is a high-speed, 32Kb (4K x 8) dual-port static random-access memory (SRAM). It features fully asynchronous parallel operation with independent access from either port. The device includes on-chip semaphore logic for hardware arbitration between ports and supports battery backup data retention at 2V. It operates on a single 5V supply within the 4.5V to 5.5V range and is available in a 64-pin TQFP package.

Feature Summary

• True dual-ported memory architecture allowing simultaneous independent access to the same memory location from both ports.
• Integrated hardware semaphore signaling block for automatic arbitration and control of shared flags between ports.
• Asynchronous operation compatible with TTL standards, supporting full on-chip circuit power-down via chip enable signals.

Applications

• High-speed data buffering in telecommunications equipment requiring concurrent read/write operations.
• Industrial control systems utilizing semaphore-based inter-process communication.
• Embedded applications requiring battery-backed volatile memory for critical data retention.

Procurement Notes

This component is officially obsolete and no longer manufactured by Renesas Electronics Corporation. Verification of availability requires checking authorized distributors for remaining stock or approved upgrade alternatives. Ensure that any substitute part number matches the required pinout, voltage specifications, and functional semaphore logic before integration into existing designs.

Selection Notes

Select this component when a design requires true dual-port SRAM with hardware semaphore support for conflict resolution. Verify that the 64-TQFP package fits the board layout constraints. Confirm that the 55ns access time meets the system timing requirements. Note that industrial temperature ranges (-40°C to +85°C) are available in specific suffixes, while commercial grades may differ.

Part Context

The 71342SA series belongs to Renesas' legacy high-speed dual-port SRAM family, originally developed under IDT branding. These devices are designed for applications demanding high bandwidth and low latency with independent port access. The 'SA' designation typically indicates standard voltage operation, while 'LA' variants often support lower voltage battery backup.

Replacement Considerations

Officially documented upgrade alternative: 71342LA25PFGI. This replacement offers faster 25ns access time and LA-series battery backup capabilities. Verify pin compatibility and electrical parameter alignment before substitution.