STK12C68

Features:

25ns, 35ns, 45ns and 55ns Access Times
"Hands-off" Automatic STORE with External 68F Capacitor on Power Down
STORE to Nonvolatile Elements Initiated by Hardware, Software or AutoStore(TM) on Power Down
RECALL to SRAM Initiated by Software or Power Restore
10mA Typical ICC at 200ns Cycle Time
Unlimited READ, WRITE and RECALL Cycles
1,000,000 STORE Cycles to Nonvolatile Ele-ments (Commercial/Industrial)
100-Year Data Retention in Nonvolatile Ele-ments (Commercial/Industrial)
Commercial, Industrial and Military Tempera-tures
28-Pin SOIC, DIP and LCC Packages


Pinout




Specifications

Voltage on Input Relative to Ground . . . . . . . . . . . . . 0.5V to 7.0V
Voltage on Input Relative to VSS  . . . . . . . . .0.6V to (VCC  + 0.5V)
Voltage on DQ0-7  or HSB. . . . . . . . . . . . . . . 0.5V to (VCC  + 0.5V)
Temperature under Bias. . . . . . . . . . . . . . . . . . . . .55°C to 125°C
Storage Temperature. . . . . . . . . . . . . . . . . . . . . . .65°C to 150°C
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1W
DC Output Current (1 output at a time, 1s duration) . . . . . . . . .15mA


Description

The Simtek STK12C68 is a fast static RAM with a nonvolatile element incorporated in each static memory cell. The SRAM can be read and written an unlimited number of times, while independent, non-volatile data resides in Nonvolatile Elements. Data transfers from the SRAM to the Nonvolatile Elements (the STORE operation) can take place automatically on power down. A 68F or larger capacitor tied from VCAP to 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. Initia-tion of STORE and RECALL cycles can also be soft-ware controlled by entering specific read sequences. A hardware STORE may be initiated with the HSB pin.