M40SZ100W

M40SZ100W 3 V NVRAM supervisor for LPSRAM 16 1 SO16 Features  Convert low power SRAMs into NVRAMs  3 V operating voltage  Precision power monitoring and power switching circuitry  Automatic write-protection when VCC is out-of- tolerance  Choice of supply voltage and power-fail deselect voltage: – VCC = 2.7 to 3.6 V; 2.55 V  VPFD  2.70 V  Reset output (RST) for power on reset  1.25 V reference (for PFI/PFO)  Less than 15 ns chip enable access propagation delay  Battery low pin (BL)  RoHS compliant – Lead-free second level interconnect Datasheet - production data Description The M40SZ100W NVRAM controller is a selfcontained device which converts a standard lowpower SRAM into a non-volatile memory. A precision voltage reference and comparator monitors the VCC input for an out-of-tolerance condition. When an invalid VCC condition occurs, the conditioned chip enable output (ECON) is forced inactive to write protect the stored data in the SRAM. During a power failure, the SRAM is switched from the VCC pin to the external battery to provide the energy required for data retention. On a subsequent power-up, the SRAM remains write-protected until a valid power condition returns. December 2013 This is information on a product in full production. DocID007528 Rev 4 1/20 www.st.com Contents Contents M40SZ100W 1 Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Operation . . . . . . . . . . . . . . . . . . . . . ...