NCV8141 ON Semiconductor, NCV8141 Datasheet - Page 8

• Manufacturer Part Number: NCV8141
• Description: 5v, 500ma Linear Regulator With Enable, /reset, And Watchdog
• Manufacturer: ON Semiconductor

V
V
R(PEAK)
WDI Held High After a Normal Period
RESET
V
R(LO)
V
V
WDI Held Low or is too Slow after
R(HI)
OUT
OUT
V
a Normal Period of Operation;
of Operation; ENABLE = LOW
Figure 10. Power RESET and Power Down
V
OUT
OUT
High and ENABLE = HIGH
When Watchdog is Held Low
When Watchdog is too Slow
and ENABLE = HIGH
and ENABLE = HIGH
V
R(LO)
When Watchdog is Held
ENABLE = LOW
t
POR
Figure 9. Timing Diagrams for Watchdog and ENABLE Functions
ENABLE
ENABLE
ENABLE
ENABLE
ENABLE
RESET
RESET
RESET
RESET
RESET
V
V
V
V
V
WDI
WDI
WDI
OUT
OUT
OUT
WDI
WDI
OUT
OUT
V
V
V
V
V
IN
IN
IN
IN
IN
0 V
0 V
0 V
0 V
0 V
0 V
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0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
0 V
NCV8141
POR Normal Operation
POR Normal Operation
Batt
Batt
POR Normal Operation
POR Normal Operation
POR
Batt
Batt
Batt
Batt
Batt
Batt
Batt
Batt
8
V
OUT
Operation
RESET
Normal
-4.5%
5.0 V
V
Figure 11. Undervoltage Triggered RESET
OUT
WDI
low
WDI
high
< 6.0 ms
Sleep Mode
Sleep Mode
Slow WDI signal
WDI held High
WDI held Low
≥ 6.0 ms
POR Normal Operation
POR Normal Operation
t
POR