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TC1278-10ENB bảng dữ liệu(PDF) 4 Page - Microchip Technology

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TC1278/TC1279
DS21384B-page 4
© 2002 Microchip Technology Inc.
3.0
APPLICATIONS INFORMATION
3.1
Operation – Power Monitor
The TC1278/TC1279 provide the function of detecting
out-of-tolerance power supply conditions and warning
a processor-based system of impending power failure.
When VCC is detected as out-of-tolerance, the RESET
signal is asserted. On power-up, RESET is kept active
for approximately 350msec after the power supply has
reached the selected tolerance. This allows the power
supply and microprocessor to stabilize before RESET
is released.
FIGURE 3-1:
Timing Diagram –
Power Up (TC1279)
FIGURE 3-2:
Timing Diagram –
Power Down (TC1279)
FIGURE 3-3:
Timing Diagram –
Power Up (TC1278)
FIGURE 3-4:
Timing Diagram –
Power Down (TC1278)
4.75V
4.00V
tR
VCCTP
VCC
RESET
tRPU1
VOH
VCC
RESET
4.75V
VCCTP
4.00V
VOL
tRPD1
tF
tR
tRPU2
VOL
VCCTP
VCC
RESET
VCCTP(MAX)
VCCTP(MIN)
tF
tRPD2
VCC
4.74V
VOH
RESET
VCCTP
4.00V
RESET SLEWS WITH VCC


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