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The DS1228S is a nonvolatile static RAM (NVSRAM) manufactured by DALLAS (now Maxim Integrated). Below are its key specifications, descriptions, and features:

Specifications:

• Memory Size: 64Kb (8K x 8-bit)
• Technology: Combines SRAM with an integrated lithium energy source for nonvolatile data retention.
• Data Retention: Minimum 10 years without power.
• Access Time: 150ns (max).
• Operating Voltage: 5V ±10%.
• Operating Temperature Range: 0°C to +70°C (commercial).
• Package: 28-pin DIP (Dual In-line Package).
• Pin Compatibility: Directly replaces standard 8K x 8 SRAMs.

Descriptions:

• The DS1228S integrates a lithium battery, control circuitry, and SRAM into a single module, ensuring data retention even when power is lost.
• It functions as a standard SRAM during normal operation but automatically switches to battery backup when power is interrupted.
• Designed for applications requiring nonvolatile memory with fast read/write performance.

Features:

• Nonvolatile Data Storage: Maintains data for at least 10 years without external power.
• Automatic Power-Fail Protection: Seamlessly switches to battery backup during power loss.
• No External Support Circuitry Needed: Integrated control logic simplifies design.
• High Reliability: Lithium energy source ensures long-term data retention.
• Industry-Standard Pinout: Compatible with JEDEC-standard 8K x 8 SRAMs.

This device is commonly used in industrial, medical, and embedded systems where data integrity is critical.