70T651S15BC

Memory IC Overview

The Renesas Electronics Corporation 70T651S15BC is a 9 Mbit (256K x 36) asynchronous dual-port static random-access memory. It operates on a single 2.5V power supply with an access time of 15 ns and supports parallel interfaces. The component is housed in a 256-CABGA package, rated for commercial temperatures from 0°C to +70°C, and has reached end-of-life status.

Memory IC Feature Summary

• Dual-port architecture enabling simultaneous independent access by two masters without external arbitration logic
• On-chip hardware support for semaphore signaling and port arbitration between the two ports
• Selectable I/O voltage compatibility allowing operation with either 3.3V or 2.5V control signals

Memory IC Applications

• High-speed data buffering in telecommunications equipment
• Cache memory implementation in embedded processing systems
• Data storage in industrial automation controllers

Memory IC Procurement Notes

This component is officially discontinued and no longer manufactured by Renesas Electronics. Verification of availability is restricted to existing stock held by distributors or secondary market suppliers. Buyers must confirm the specific revision level and packaging type, as legacy inventory may vary in condition and origin. Compliance with RoHS standards should be verified against the specific batch documentation provided by the seller.

Memory IC Selection Notes

Engineers replacing this part should evaluate current asynchronous dual-port SRAM alternatives that match the 256K x 36 organization and 256-ball BGA footprint. Key selection criteria include verifying compatible access times, ensuring identical pinout configurations to minimize PCB redesign, and confirming that the replacement device meets the required operating temperature range and power supply specifications for the target application.

Memory IC Part Context

The 70T651S15BC belongs to the 70T651 series of high-speed asynchronous dual-port RAMs. This family is designed for applications requiring full-speed, error-free operation without additional discrete logic. The series supports depth expansion through cascading and includes features like RapidWrite mode and sleep mode inputs for power optimization.

Memory IC Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.