Capstore 32k X 8 NvsramThe U637256 has two separate
modes of operation: SRAM mode
and nonvolatile mode. In SRAM
mode, the memory operates as an
ordinary static RAM. In nonvolatile
operation, data is transferred in
parallel from SRAM to EEPROM or
from EEPROM to SRAM In this
mode SRAM functions are disab-
LED
The U637256 is a static RAM with
a nonvolatile electrically erasable
PROM (EEPROM) element incor-
porated in each static memory cell.
The SRAM CAN be read and written
an unlimited number of times, while
independent nonvolatile data resi-
des in EEPROM Data transfers
from the SRAM to the EEPROM
(the STORE operation) take place
automatically upon power down
using charge stored in an integraed
capacitor. Transfers from the
EEPROM to the SRAM (the
RECALL operation) take place
automatically on power up. The
U637256 combines the ease of use
of an SRAM with nonvolatile data
integrity. By Unkown
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