DESCRIPTION
The M40Z300/W NVRAM SUPERVISOR 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.

FEATURES SUMMARY
■ CONVERTS LOW POWER SRAM INTO
   NVRAMs
■ PRECISION POWER MONITORING AND
   POWER SWITCHING CIRCUITRY
■ AUTOMATIC WRITE-PROTECTION WHEN
   VCC IS OUT-OF-TOLERANCE
■ TWO-INPUT DECODER ALLOWS
   CONTROL FOR UP TO 8 SRAMs (with 2
   devices active in parallel)
■ CHOICE OF SUPPLY VOLTAGES AND
   POWER-FAIL DESELECT VOLTAGES:
   – M40Z300:
      VCC = 4.5V to 5.5V
      THS = VSS: 4.5V ≤ VPFD ≤ 4.75V
      THS = VOUT: 4.2V ≤ VPFD ≤ 4.5V
   – M40Z300W:
      VCC = 3.0V to 3.6V
      THS = VSS: 2.8V ≤ VPFD ≤ 3.0V
      VCC = 2.7V to 3.3V
      THS = VOUT: 2.5 ≤ VPFD ≤ 2.7V
■ RESET OUTPUT (RST) FOR POWER ON
   RESET
■ BATTERY LOW PIN (BL)
■ LESS THAN 12ns CHIP ENABLE ACCESS
   PROPAGATION DELAY (for 5.0V device)
■ PACKAGING INCLUDES A 28-LEAD SOIC
   AND SNAPHAT® TOP (to be ordered
   separately), OR A 16-LEAD SOIC
■ SOIC PACKAGE PROVIDES DIRECT
   CONNECTION FOR A SNAPHAT TOP
   WHICH CONTAINS THE BATTERY