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M40SZ100W：3 V NVRAM supervisor for LPSRAM

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 V_CCinput for an out-of-tolerance condition.

When an invalid V_CCcondition occurs, the conditioned chip enable output (E_CON)is forced inactive to write protect the stored data in the SRAM. During a power failure, the SRAM is switched from the V_CCpin 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

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