71421LA20JG8

Overview

The Renesas Electronics Corporation 71421LA20JG8 is a dual-port static random-access memory (SRAM) integrated circuit. It features an 8Kb storage capacity organized as 1K x 8 bits. The device utilizes a parallel interface with a 20 ns access time and operates on a single 5V power supply ranging from 4.5V to 5.5V. It is housed in a 64-TQFP surface-mount package measuring 14x14 mm. The component supports asynchronous operation and includes battery backup capabilities for data retention down to 2V.

Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to the same memory location by two processors.
• Integrated interrupt logic designed to facilitate efficient interprocessor communication without requiring additional discrete logic components.
• Automatic power-down functionality controlled by chip enable signals, allowing the internal circuitry to enter a low standby power mode.

Applications

• Stand-alone 8-bit dual-port RAM systems
• Master dual-port RAM configurations in 16-bit or wider word width systems
• Interprocessor communication interfaces

Procurement Notes

Verify component authenticity through authorized channels due to discontinuation status. Confirm RoHS compliance requirements against specific project standards, as manufacturing variations may exist. Validate package dimensions and pinout compatibility during integration planning. Review official datasheets for updated environmental classifications and handling instructions prior to procurement.

Selection Notes

Select this component when simultaneous bidirectional memory access is required for high-speed data exchange between processors. The integrated interrupt logic simplifies system design by eliminating external arbitration hardware. Ensure the application environment remains within the specified commercial temperature range of 0°C to 70°C. Verify that the 64-TQFP package fits the available board space constraints.

Part Context

This part belongs to the IDT71421LA series of dual-port SRAMs manufactured by Renesas Electronics. These devices are engineered for applications demanding fast, error-free data transfer between multiple processing units. The LA suffix indicates commercial temperature rating and TTL-compatible voltage levels. The series supports expansion to wider data buses when paired with compatible slave devices.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult manufacturer archives for legacy replacements or evaluate equivalent dual-port SRAMs with matching speed, capacity, and package specifications.