NVRAM CONTROLLER for up to EIGHT LPSRAM

DESCRIPTION
The M40Z300/W 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 VCC input for an out-of-tolerance condition.

■ CONVERT LOW POWER SRAMs 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
■ LESS THAN 12ns CHIP ENABLE ACCESS
   PROPAGATION DELAY (for 5.0V device)
■ PACKAGING INCLUDES a 28-LEAD SOIC
   and SNAPHAT® TOP, or a 16-LEAD SOIC
   (to be Ordered Separately)
■ SOIC PACKAGE PROVIDES DIRECT
   CONNECTION for a SNAPHAT TOP which
   CONTAINS the BATTERY
■ BATTERY LOW PIN (BL)