M40SZ100WMQ6F

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 V_CC input for an out-of-tolerance condition. When an invalid V_CC condition occurs, the conditioned chip enable output (E_CON（overline）) is forced inactive to write protect the stored data in the SRAM. During a power failure, the SRAM is switched from the V_CC 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.

Key features

• Convert low power SRAMs into NVRAMs
• 3 V operating voltage
• Precision power monitoring and power switching circuitry
• Automatic write-protection when V_CC is out-oftolerance
• Choice of supply voltage and power-fail deselect voltage: – V_CC = 2.7 to 3.6 V; 2.55 V ≤ V_PFD ≤ 2.70 V
• Reset output (RST (overline)) 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