NVRAM supervisor
M40SZ100W
3 V NVRAM supervisor for LPSRAM
16
1
SO16
Features
Convert low power SRAMs into NVRAMs 3 V operating vol...
Description
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 . . . . . . . . . . . . . . . . . . . . . ...
Similar Datasheet