70121S55J

Memory IC Overview

The 70121S55J is a high-speed 2K x 9 Dual-Port Static RAM manufactured by Renesas Electronics. It operates asynchronously with a maximum access time of 55 ns and supports parallel interfaces. The device functions as a standalone memory unit or as a master component in expanded systems, utilizing on-chip arbitration logic for port management.

Memory IC Feature Summary

• Supports fully asynchronous operation from either port
• Includes on-chip port arbitration logic
• Provides BUSY output flag for status indication

Memory IC Applications

• Standalone 9-bit dual-port memory systems
• Master component in 18-bit or wider word width architectures
• Systems requiring automatic power-down via CE control

Memory IC Procurement Notes

Verify the exact manufacturer designation and RoHS compliance status through official datasheets, as sourcing information indicates potential discontinuation or limited availability. Confirm package dimensions and moisture sensitivity levels before integration to ensure supply chain reliability.

Memory IC Selection Notes

Select this component when simultaneous independent access to shared memory locations is required without external arbitration logic. It is suitable for applications needing low standby power modes controlled by chip enable signals and TTL-compatible signal levels.

Memory IC Part Context

This part belongs to the IDT 70121 series of dual-port SRAMs. It is designed to expand data bus widths up to 18 bits or more when paired with slave devices like the 70125, enabling full-speed error-free operation in complex memory configurations.

Memory IC Replacement Considerations

Public confirmed substitute part numbers are not available.