Datasheet

This is information on a product in full production.
December 2013 DocID007528 Rev 4 1/20
M40SZ100W
3 V NVRAM supervisor for LPSRAM
Datasheet - production data
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-of-
tolerance
 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) 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
Description
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
CC
input for an out-of-tolerance
condition.
When an invalid V
CC
condition 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
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.
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