7140SA55J

Overview

The Renesas Electronics Corporation 7140SA55J is an asynchronous dual-port static random-access memory (SRAM) integrated circuit. It provides a storage capacity of 8 kilobits, organized as 1K words by 8 bits. The device features a parallel interface with a maximum access time of 55 nanoseconds and a write cycle time of 55 nanoseconds. It operates within a supply voltage range of 4.5V to 5.5V and supports surface-mount installation in a 52-pin Plastic Leadless Chip Carrier (PLCC) package.

Feature Summary

• Dual-port architecture enabling independent simultaneous read/write operations on two separate ports
• Asynchronous operation allowing flexible timing control without external clock synchronization
• CMOS technology providing low power consumption characteristics relative to older bipolar implementations

Applications

• High-speed data buffering in telecommunications equipment
• Cache memory implementation in embedded processing systems
• Data storage for network switching applications

Procurement Notes

This component has been officially discontinued by the manufacturer. Verification of availability is restricted to existing stock held by distributors or secondary market suppliers. Buyers must confirm the specific revision level and physical condition of units prior to acquisition, as original manufacturing support and new production are no longer available.

Selection Notes

Engineers should evaluate alternative components from current product lines due to the discontinuation status of this part. Selection criteria must account for pin compatibility if maintaining legacy footprints, while ensuring that newer replacements meet the required 55ns access speed and 3.3V or 5V logic levels. Cross-referencing datasheets for electrical parameters is essential to guarantee functional equivalence in existing designs.

Part Context

The 7140SA55J belongs to the IDT 7140 series of dual-port SRAMs, originally developed by Integrated Device Technology before its acquisition by Renesas Electronics. This series was designed for high-performance applications requiring fast, independent port access. The 'LA' suffix typically denotes lead-free packaging variants within the broader family, though specific RoHS compliance details vary by manufacturing batch and date code.

Replacement Considerations

Publicly confirmed substitute part numbers are not explicitly listed in the provided documentation. Engineers should consult official Renesas replacement guides or contact technical support directly for validated cross-reference recommendations.