TC1274 Datasheet, PDF (5/12 Pages) Microchip Technology – 3-Pin Reset Monitors for 5V Systems

TC1272/TC1273/TC1274
4.0 APPLICATIONS INFORMATION
4.1 Operation – Power Monitor
The TC1272/TC1273/TC1274 is designed to function
as a voltage monitor for +5V systems. These devices
provide a RESET signal to indicate that the V_CC has
dropped below a preset voltage level that is selected by
the suffix part number. In addition, the RESET is held
active for approximately 200 ms after the power supply
has risen above the voltage threshold level to allow
time for the power supply to stabilize before system
operation commences.
V_CCTP(MIN)
t_R
V_C^V_CCTCPTP^(MAX)
V_CC
RESET
t_RPU1
V_OH
FIGURE 4-1:
Timing Diagram – Power Up
(TC1272/TC1273).
V_CC
V_CCTP(MAX)
V_CCTP
t_F
V_CCTP(MIN)
V_CC
t_R
V_CCTP(MIN)
V_CCTP(MAX)
V_CCTP
t_RPU2
RESET
FIGURE 4-3:
(TC1274).
V_OL
Timing Diagram – Power Up
V_CC
V_CCTP(MAX)
V_CCTP
t_F
V_CCTP(MIN)
t_RPD2
RESET
V_OH
RESET Slews With V_CC
FIGURE 4-4:
Timing Diagram –
Power Down (TC1274).
RESET
t_RPD1
V_OL
FIGURE 4-2:
Timing Diagram – Power
Down (TC1272/TC1273).
 2003 Microchip Technology Inc.
DS21382B-page 5