STK11C68-SF25

Overview

The Simtek STK11C68-SF25 is a Non-Volatile SRAM featuring an 8K x 8 bit memory density and a 25 ns access time. It utilizes CMOS technology and operates with a single 5V power supply. The device integrates standard SRAM cells with nonvolatile EEPROM elements, enabling unlimited read/write cycles for the SRAM while retaining data in the EEPROM for up to 10 years or 100,000 cycles. Data transfers between the volatile and nonvolatile sections are managed via software STORE and RECALL sequences.

Feature Summary

• Integrates fast static RAM with embedded nonvolatile EEPROM elements within each memory cell
• Provides unlimited read and write cycles to the SRAM section
• Supports automatic data recall from nonvolatile memory upon power-up
• Maintains independent nonvolatile data integrity through software-initiated store operations

Applications

• Industrial control systems requiring persistent configuration storage
• Data logging applications needing frequent updates without wear on flash memory
• Embedded systems demanding rapid random access with nonvolatile retention

Procurement Notes

Verify the specific suffix SF25 against official Simtek documentation to confirm package type and temperature range. Ensure compatibility with existing system voltage requirements of 5V ± 10%. Cross-reference pinouts with industry-standard SRAMs if replacing legacy components. Confirm availability of datasheets for accurate timing parameters.

Selection Notes

Select this component when high-speed random access is required alongside nonvolatile data retention. It serves as a drop-in replacement for standard SRAMs where power loss protection is necessary. Consider the 25 ns access speed for synchronous or asynchronous interfaces. Evaluate the 8K x 8 capacity against application memory needs before finalizing the design.

Part Context

This part belongs to the Simtek SoftStore nvSRAM family, which combines the performance of SRAM with the persistence of EEPROM. The STK11C68 variant specifically offers 64 Kbit capacity. These devices were originally developed by Simtek and later continued under Cypress Semiconductor after acquisition, maintaining pin compatibility with standard SRAM packages.

Replacement Considerations

Check for STK11C68-5 variants which share similar specifications but may differ in access speed or package options. Verify that substitute parts support the same 5V operation and software-controlled store/recall mechanisms.