7164S45DB

Overview

The Renesas Electronics Corporation 7164S45DB is a 64K-bit (8K x 8) Static Random Access Memory (SRAM) component manufactured using BICMOS technology. It operates within the 7164S35 series and is housed in a 28-CDIP package with a width of 0.600 inches (15.24mm). The device functions as an asynchronous parallel SRAM, providing non-volatile data retention capabilities when paired with battery backup systems in its low-power variants. This specific part number represents a legacy product currently classified as obsolete by the manufacturer.

Feature Summary

• Utilizes BICMOS technology for high-speed asynchronous parallel memory access
• Offers reduced power standby mode functionality for energy efficiency
• Supports battery backup configurations to maintain data integrity during power loss

Applications

• Legacy industrial control systems requiring reliable static RAM
• Embedded applications utilizing older microcontroller architectures
• Equipment maintenance involving obsolete electronic assemblies

Procurement Notes

This component is officially designated as obsolete by Renesas Electronics Corporation. Availability is restricted to surplus or secondary market channels. Buyers must verify the authenticity of the source and inspect the physical condition of the CDIP-28 package before acquisition. Compliance with RoHS directives may vary; confirm the specific revision status with the supplier. Due to the end-of-life status, long-term supply continuity cannot be guaranteed through standard manufacturing channels.

Selection Notes

Engineers replacing this obsolete part should evaluate modern SRAM alternatives that match the 8K x 8 organization and 28-pin DIP footprint. Verify voltage compatibility, as the 7164 series typically operates at 5V. Consider interface differences between asynchronous parallel SRAM and newer serial interfaces. Ensure the replacement supports the required operating temperature range and maintains signal integrity for the original system design without necessitating major PCB modifications.

Part Context

The 7164S45DB belongs to the 7164S35 family of static random access memories produced by Renesas Electronics. This family includes variations such as the 7164S35DB and 7164S45DB, which share similar organizational structures but may differ in speed grades or packaging options. These components were widely used in computing and industrial electronics prior to the dominance of higher-density flash and DRAM technologies.

Replacement Considerations

Publicly confirmed substitute part numbers include IDT7164S35DB.