M40SZ100W Datasheet PDF - ST Microelectronics

●The M40SZ100W NVRAM controller is a self-contained device which converts a standard low-power SRAM into a non-volatile memory. A precision voltage reference and comparator monitors the VCCinput for an out-of-tolerance condition.

●When an invalid VCCcondition 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 VCCpin 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.

●Key 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