71421LA4J8

Overview

The Renesas Electronics Corporation 71421LA4J8 is a high-speed, 16-kilobit (2K x 8) dual-port static random-access memory (SRAM). It operates on a single 5V power supply with TTL-compatible inputs. The device features true dual-ported memory cells allowing simultaneous access to the same location. It supports battery backup for data retention down to 2V and includes an automatic power-down feature controlled by chip enable signals.

Feature Summary

• True dual-ported architecture enabling simultaneous independent access to shared memory locations
• TTL-compatible single 5V power supply operation
• Battery backup capability supporting data retention at voltages as low as 2V
• Automatic power-down mode controlled by chip enable inputs

Applications

• High-speed buffer applications in parallel processing systems
• Data storage in real-time control environments
• Slave dual-port RAM configurations paired with master dual-port devices
• Industrial control systems requiring reliable volatile memory

Procurement Notes

Verify component authenticity through authorized channels due to potential availability of obsolete or refurbished units. Confirm package integrity and lead condition upon receipt. Check for RoHS compliance status as older variants may not meet current environmental standards. Validate datasheet revisions against specific manufacturing lot requirements before integration into production designs.

Selection Notes

Select this component when designing systems requiring independent read/write access to shared memory without external arbitration logic. Ensure the design accommodates the 5V operating voltage and TTL input levels. Consider the physical dimensions of the PLCC package during PCB layout. Verify that the system's power supply can support the required standby and active current specifications defined in the electrical characteristics table.

Part Context

This part belongs to the 7142 series of dual-port SRAMs manufactured by Renesas Electronics. These components are designed to function as slave devices in wider word-length systems when paired with master dual-port RAMs like the 7132 series. The series provides full-speed, error-free operation without additional discrete logic, simplifying system architecture for high-performance computing tasks.

Replacement Considerations

Consult official Renesas documentation for verified cross-reference part numbers. Ensure any substitute maintains identical pinout, voltage levels, and timing parameters. Verify compatibility with existing master dual-port controllers if used in paired configurations.