Description
The U631H256XS has two separate modes of operation: SRAM mode and nonvolatile mode. In SRAM mode, the memory operates as an ordinary static RAM. In non volatile operation, data is transferred in parallel from SRAM to EEPROM or from EEPROM to SRAM. In this mode SRAM functions are disabled.

FEATUREs
High-performance CMOS non volatile static RAM 32768 x 8 bits
25 ns Access Times
10 ns Output Enable Access Times
Software STORE Initiation
Automatic STORE Timing
10⁶ STORE cycles to EEPROM
100 years data retention in EEPROM
Automatic RECALL on Power Up
Software RECALL Initiation
Unlimited RECALL cycles from EEPROM
Unlimited Read and Write to SRAM
Single 5 V ± 10 % Operation
Operating temperature ranges:
  0 to 70 °C
  -40 to 85 °C
QS 9000 Quality Standard
ESD protection > 2000 V(MIL STD 883C M3015.7-HBM)
RoHS compliance and Pb- free Package: SOP28 (330 mil)
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