71421LA20JG

Overview

The Renesas Electronics Corporation 71421LA20JG is a dual-port static random-access memory (SRAM) integrated circuit. It features an 8Kb storage capacity organized as 1K words by 8 bits. The device supports parallel interface communication with a maximum access time of 20 nanoseconds. It operates on a single 5V power supply within a voltage range of 4.5V to 5.5V. The component is housed in a 52-pin PLCC package and is designed for asynchronous operation.

Feature Summary

• True dual-ported memory architecture enabling simultaneous independent access to the same memory location from both ports without conflict.
• Integrated interrupt logic providing two INT flags for direct port-to-port processor communications.
• On-chip arbitration logic manages bus access, featuring a BUSY output flag to indicate port availability.
• Automatic power-down mode controlled by chip enable signals to minimize standby power consumption.

Applications

• Interprocessor communication links between microprocessors or digital signal processors.
• High-speed data buffering in embedded systems requiring low-latency access.
• Master-slave memory expansion configurations to increase data bus width beyond 8 bits.
• Battery-backed volatile memory applications utilizing the LA series 2V retention capability.

Procurement Notes

Verify component authenticity through authorized distributors due to end-of-life status. Confirm RoHS compliance requirements against specific project standards, as legacy variants may differ. Check for moisture sensitivity level handling instructions prior to surface mount assembly. Validate pinout compatibility with existing PCB footprints before finalizing procurement decisions.

Selection Notes

Select this component when simultaneous bidirectional data access is required without external arbitration logic. Choose the LA variant if battery backup operation down to 2V is necessary for data retention during power transitions. Ensure the system design accommodates the 52-pin PLCC footprint and 5V TTL-compatible I/O levels. Consider the 20ns access speed for timing constraints in high-frequency asynchronous buses.

Part Context

This part belongs to the IDT 71421LA family of dual-port SRAMs manufactured by Renesas Electronics. The family includes variations with different access speeds and packages. The 71421LA specifically denotes the 20ns speed grade in a 52-pin PLCC package. It is often paired with master devices like the 71321 for expanded memory architectures.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify cross-references with manufacturer obsolescence notices for equivalent speed grades and package types.