71421SA55J8

Overview

The 71421SA55J8 is a dual-port, asynchronous static random-access memory (SRAM) integrated circuit manufactured by Renesas Electronics. It provides a total storage capacity of 16 kilobits, organized as 2048 words by 8 bits. The device features parallel interface access with a maximum access time of 55 nanoseconds. It operates within a supply voltage range of 4.5 volts to 5.5 volts and supports surface-mount installation in a 52-lead Plastic Leadless Chip Carrier (PLCC) package measuring 19.13mm by 19.13mm. The component is rated for operation at ambient temperatures between 0°C and 70°C.

Feature Summary

• Dual-port architecture enabling independent simultaneous access from two separate processors or systems
• Asynchronous parallel interface supporting standard logic-level control signals
• CMOS technology providing low power consumption relative to bipolar alternatives
• Volatile memory structure retaining data only while powered

Applications

• High-speed data buffering in telecommunications equipment
• Cache memory implementation in embedded processing systems
• Data logging and temporary storage in industrial control units
• Firmware staging areas in network infrastructure hardware

Procurement Notes

Verify the specific suffix J8 confirms the PLCC-52 package variant when sourcing replacements. Confirm RoHS compliance status as historical documentation indicates non-compliance with current directives. Check manufacturer end-of-life notices for availability constraints. Validate moisture sensitivity level requirements during assembly handling. Ensure voltage levels match system specifications strictly within the 4.5V to 5.5V operating range.

Selection Notes

Select this component when dual-port functionality is required for concurrent read/write operations without external arbitration logic. The 55ns speed suits moderate-frequency parallel buses where faster SRAMs are unnecessary. Consider the PLCC-52 footprint compatibility with existing PCB layouts. Evaluate thermal performance within the commercial temperature range for enclosure designs. Compare against single-port variants if simultaneous access is not needed to reduce cost.

Part Context

This part belongs to the Renesas 71421SA series of dual-port SRAMs. It shares architectural similarities with other members like the 71421LA55JI8 but differs in package type and temperature rating. The series was originally developed under IDT branding before corporate acquisition. These devices were designed for applications requiring high-bandwidth memory sharing between microprocessors and DSPs.

Replacement Considerations

IDT71421SA55J8 is a confirmed equivalent part number representing the same device prior to brand consolidation.