71421LA35J

Overview

The Renesas Electronics Corporation 71421LA35J is a dual-port static random-access memory (SRAM) integrated circuit. It features a storage capacity of 16 kilobits organized as 2K by 8 bits. The device supports parallel asynchronous interface operations with a maximum access time of 35 nanoseconds. It operates within a supply voltage range of 4.5 volts to 5.5 volts and is designed for surface-mount installation in a 52-pin Plastic Leadless Chip Carrier package.

Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to the same memory location from two separate ports.
• Integrated interrupt logic providing internal flags for direct interprocessor communication without discrete external components.
• On-chip port arbitration logic manages bus conflicts, ensuring error-free operation during concurrent data transfers.

Applications

• Stand-alone high-speed dual-port RAM systems
• Master dual-port RAM configuration in expanded word width architectures
• Interprocessor communication interfaces requiring low-latency data exchange

Procurement Notes

Verify component authenticity through authorized channels due to end-of-life status. Confirm RoHS compliance requirements against project specifications, as this specific variant may not meet current environmental directives. Validate package integrity upon receipt to ensure suitability for automated surface-mount assembly processes.

Selection Notes

Select this component when simultaneous bidirectional data access is required between processing units. Ensure system design accommodates the 52-pin PLCC footprint and 5-volt logic levels. Consider the 35-nanosecond access speed relative to processor clock cycles to prevent bus contention or timing violations in the target application environment.

Part Context

This part belongs to the 71421LA series of dual-port SRAMs manufactured by Renesas Electronics. It serves as a master device capable of expanding data bus widths when paired with compatible slave devices. The series utilizes CMOS technology to provide high-speed performance while maintaining compatibility with standard TTL logic families for broader integration flexibility.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify functional equivalence with other 71421 series variants or cross-reference manufacturer obsolescence notices for recommended upgrades.