M40Z300_05 Datasheet, PDF (1/21 Pages) STMicroelectronics – 5V or 3V NVRAM Supervisor for Up to 8 LPSRAMs

M40Z300
M40Z300W
5V or 3V NVRAM Supervisor for Up to 8 LPSRAMs
FEATURES SUMMARY
■ CONVERTS LOW POWER SRAM INTO
NVRAMs
■ PRECISION POWER MONITORING AND
POWER SWITCHING CIRCUITRY
■ AUTOMATIC WRITE-PROTECTION WHEN
V_CC 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:
V_CC = 4.5V to 5.5V
THS = V_SS: 4.5V ≤ V_PFD ≤ 4.75V
THS = V_OUT: 4.2V ≤ V_PFD ≤ 4.5V
– M40Z300W:
V_CC = 3.0V to 3.6V
THS = V_SS: 2.8V ≤ V_PFD ≤ 3.0V
V_CC = 2.7V to 3.3V
THS = V_OUT: 2.5 ≤ V_PFD ≤ 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
Figure 1. 16-pin SOIC Package
16
1
SO16 (MQ)
Figure 2. 28-pin SOIC Package
SNAPHAT (SH)
Crystal/Battery
28
1
SOH28 (MH)
February 2005
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