IMP1233M
Application Information
Operation – Power Monitor
The IMP1233M detects out-of-tolerance power supply conditions.
It resets a processor during power-up and issues a reset to the
system processor when the monitored power supply voltage
is below the reset threshold (power-down). When an out-of-
tolerance VCC voltage is detected, the RESET signal is asserted. On
power-up, RESET is kept active (LOW) for approximately 350ms
after the power supply voltage has reached the selected tolerance.
This allows the power supply and microprocessor to stabilize
before RESET is released.
tR
VHTL
VCCTP
VLTL
VCC
tRPU
VOH
RESET
1233M_05.eps
Figure 1. Timing Diagram: Power-Up
tF
VCC
VHTL
VCCTP
VLTL
tRPD
RESET
VOL
1233M_06.eps
Figure 2. Timing Diagram: Power-Down
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© 1999 IMP, Inc.
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