TC1279 Microchip Technology, TC1279 Datasheet - Page 4

• Manufacturer Part Number: TC1279
• Description: (TC1278) 3-Pin Reset Monitors for 5V Systems
• Manufacturer: Microchip Technology

TC1278/TC1279
3.0
3.1
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 V
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:
FIGURE 3-2:
DS21384B-page 4
V
RESET
V
RESET
CC
CC
CC
APPLICATIONS INFORMATION
Operation – Power Monitor
is detected as out-of-tolerance, the RESET
4.75V
V
CCTP
4.00V
Timing Diagram –
Power Up (TC1279)
Timing Diagram –
Power Down (TC1279)
4.00V
V
CCTP
V
4.75V
t
RPU
OL
t
1
F
t
R
t
RPD1
V
OH
FIGURE 3-3:
FIGURE 3-4:
V
V
RESET
RESET
CC
CC
4.74V
V
CCTP
V
V
CCTP(MIN)
OH
4.00V
Timing Diagram –
Power Up (TC1278)
Timing Diagram –
Power Down (TC1278)
©
2002 Microchip Technology Inc.
t
F
t
RPD2
RESET SLEWS WITH V
V
CCTP
t
RPU2
V
CCTP(MAX)
t
R
V
CC
OL