2Mx8 Nonvolatile SRAM
BQ4017Texas Instruments   2048Kx8 Nonvolatile SRAM, 5% Voltage Tolerance 
BQ4017YTexas Instruments   2048Kx8 Nonvolatile SRAM, 10% Voltage Tolerance 
DS1254Maxim   2M x 8 NV SRAM with Phantom Clock 
DS1270ABMaxim   16M Nonvolatile SRAM 
DS1270WMaxim   3.3V 16Mb Nonvolatile SRAM 
DS1270YMaxim   16M Nonvolatile SRAM 

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