DESCRIPTION

The Simtek STK14C88 is a fast static RAMwith a nonvolatile element incorporated in each static

memory cell. The SRAMcan be read and written an unlimited number of times, while independent, nonvolatile data resides in the nonvolatile elements. Data transfers from the SRAMto the nonvolatile elements (the STOREoperation) can take place automatically on power down. A 68μF or larger capacitortied from VCAPto ground guarantees the STORE operation, regardless of power-down slew rate or loss of power from “hot swapping”. Transfers from the nonvolatile elements to the SRAM(the RECALL operation) take place automatically on restoration of power. Initiation of STOREand RECALLcycles can also be software controlled by entering specific read

sequences. A hardware STOREmay be initiated with the HSBpin.

FEATURES

? 25ns, 35ns and 45ns Access Times

? “Hands-off” Automatic STOREwith External 68μF Capacitor on Power Down

? STOREto nonvolatile elements Initiated by Hardware, Software or AutoStore?

? RECALLto SRAM Initiated by Software or Power Restore

? 10mA Typical ICC at 200ns Cycle Time

? Unlimited READ, WRITE and RECALLCycles

? 1,000,000 STORECycles to nonvolatile elements (Commercial/Industrial)

? 100-Year Data Retention in nonvolatile elements (Commercial/Industrial)

? Single 5V +10 Operation

? Commercial, Industrialand Military Temperatures

? 32-Pin SOIC, DIP and LCC Packages