IMP1812
Application Information
Operation – Power Monitor
The IMP1812 detects out-of-tolerance power supply conditions. It
resets a processor during power-up, power-down and issues a
reset to the system processor when the monitored power supply
voltage is below the reset threshold. When an out-of-tolerance VCC
voltage is detected, the RESET signal is asserted. On power-up,
RESET is kept active (HIGH) for approximately 150ms after the
power supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stabilize before
RESET is released.
tF
VCC
VCCTP (MAX)
VCCTP
VCCTP (MIN)
tRPD
VOH
tR
RESET Slews with VCC
RESET
VCCTP (MAX)
1812_07.eps
VCCTP
VCCTP (MIN)
Figure 2. Timing Diagram: Power-Down
VIN
tRPU
VOL
RESET
1812_06.eps
Figure 1. Timing Diagram: Power-Up
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© 1999 IMP, Inc.
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