71421LA5J8

Overview

The Renesas Electronics Corporation 71421LA5J8 is a high-speed 2K x 8 dual-port static random-access memory (SRAM) component. It operates with a single 5V ±10% power supply and features TTL-compatible inputs. The device supports simultaneous access to the same memory location via true dual-ported cells. Key electrical parameters include an access time of 55 ns, a core voltage of 5.0 V, and a density of 16 kb organized as 2k x 8 bits. It utilizes a parallel asynchronous interface and includes busy flag functionality for slave I/O operations.

Feature Summary

• Supports simultaneous independent access to shared memory locations by two separate ports without external arbitration logic.
• Integrates automatic power-down circuitry controlled by chip enable signals to minimize standby power consumption.
• Includes battery backup capability allowing data retention at low voltages down to 2V.

Applications

• High-speed data buffering in industrial equipment requiring error-free operation.
• Real-time engine control systems utilizing master-slave dual-port architectures.
• Parallel communication interfaces in embedded systems needing fast concurrent read/write cycles.

Procurement Notes

Verify component authenticity through authorized channels due to end-of-life status. Confirm package integrity and moisture sensitivity level handling procedures before assembly. Check for lead-free compliance requirements against original specifications. Validate pin compatibility with existing PCB footprints. Review datasheet revisions for any functional updates or environmental regulation changes affecting procurement.

Selection Notes

Select this component when designing systems requiring true dual-port memory with slave configuration capabilities. Ensure the design accommodates the 52-pin PLCC package dimensions and pitch constraints. Verify that the system power supply maintains the required 5V tolerance. Consider the 55 ns access speed relative to the host processor clock cycle. Evaluate thermal management needs within the specified operating temperature range.

Part Context

This part belongs to the 7142 series of dual-port SRAMs originally developed by Integrated Device Technology (IDT) and later acquired by Renesas Electronics. The series is designed to replace discrete logic solutions in multi-port memory applications. The 71421 variant specifically targets 2K x 8 configurations, offering a compact solution for legacy and specialized industrial memory interfaces.

Replacement Considerations

Public confirmed substitute part numbers: IDT71421LA55J8, 7142SA55J8, 71421SA55J8.