Description
The UL635H256 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 disabled.

Features
• High-performance CMOS nonvolatile static RAM 32768 x 8 bits
• 35 and 45 ns Access Times
• 15 and 20 ns Output Enable Access Times
• ICC = 8 mA typ. at 200 ns Cycle Time
• Automatic STORE to EEPROM on Power Down using system capacitance
• Software initiated STORE
• 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
• Wide voltage range: 2.7 ... 3.6 V (3.0 ... 3.6 V for 35 ns type)
• Operating temperature range: 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)