STK14C88-M

Features:

• Nonvolatile Storage without Battery Problems
• 35ns and 45ns Access Times
• "Hands-off" Automatic STORE with External
   68mF Capacitor on Power Down
• STORE to EEPROM Initiated by Hardware,
   Software or AutoStore™ 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
• 100,000 STORE Cycles to EEPROM
• 10-Year Data Retention in EEPROM
• Single 5V + 10% Operation
• Not Sensitive to Power On/Off Ramp Rates
• No Data Loss from Undershoot
• 32-Pad LCC and 32-Pin 300 mil CDIP Packages


Pinout




Specifications

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 STK14C88-M is a fast static RAM with a nonvolatile, electrically erasable PROM element incorporated in each static memory cell. The SRAM can be read and written an unlimited number of times, while independent nonvolatile data resides in EEPROM. Data transfers from the SRAM to the EEPROM (the STOREoperation) can take place automatically on power down. A 68mF 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 EEPROM to the SRAM (the RECALL operation) take place automatically on restoration of power. Initiation of STORE and RECALL cycles can also be software controlled by entering specific read sequences. A hardware STOREmay be initiated with the HSB pin.