71342LA45JI8

Overview

The Renesas Electronics Corporation 71342LA45JI8 is a high-speed, 32Kb (4K x 8) dual-port static random-access memory (SRAM). It features fully asynchronous operation with an access time of 45 ns and operates on a single 5V TTL-compatible power supply. The device includes independent semaphore logic for port arbitration and supports battery backup data retention down to 2V. It is housed in a 52-pin PLCC package and is rated for commercial operating temperatures ranging from 0°C to +70°C.

Feature Summary

• True dual-ported architecture allowing simultaneous independent access to the same memory location by two separate ports.
• Integrated hardware semaphore signaling block for automatic arbitrating between ports without software intervention.
• Automatic power-down feature controlled by chip enable and semaphore signals to achieve very low standby power consumption.
• Battery backup capability ensuring data retention at voltages as low as 2V.

Applications

• High-speed data buffering in telecommunications equipment
• Cache memory implementation in industrial control systems
• Data storage in network routers and switches
• Real-time processing units in embedded computing applications

Procurement Notes

Verify component authenticity through authorized channels due to potential availability of refurbished or obsolete stock. Confirm that the specific suffix matches the required 52-pin PLCC package and commercial temperature range. Check for RoHS compliance status as older variants may not meet current environmental regulations. Ensure proper handling procedures are followed during installation to prevent electrostatic discharge damage to the sensitive CMOS circuitry.

Selection Notes

Select this component when simultaneous bidirectional access to shared memory is required without external arbitration logic. The integrated semaphore mechanism simplifies system design compared to single-port alternatives requiring complex handshake protocols. Consider the 45 ns access speed against system clock requirements and verify that the 5V supply voltage aligns with the target platform's power distribution network constraints.

Part Context

This part belongs to the Renesas 71342LA series of dual-port SRAMs, originally developed under the IDT brand before acquisition. The series is characterized by its true dual-port capability and dedicated semaphore logic for efficient multi-processor communication. These devices serve as critical interconnect components in systems requiring high-bandwidth data sharing between independent processing units.

Replacement Considerations

Cross-reference with IDT71342LA45J8I for pin-compatible equivalents. Verify functional equivalence regarding semaphore logic behavior and power-down modes. Ensure replacement parts match the 52-pin PLCC physical footprint and 0°C to +70°C operating temperature specifications.