ncv8508b ON Semiconductor, ncv8508b Datasheet - Page 5

• Manufacturer Part Number: ncv8508b
• Description: Ncv8508b 5.0 V, 250 Ma Ldo With Watchdog And Reset
• Manufacturer: ON Semiconductor

V
RESET
Wakeup
WDI
V
V
RESET
Wakeup
WDI
V
RESET
Wakeup
WDI
V
IN
OUT
IN
OUT
OUT
Power Up
RESET High
RESET High
Delay Time
Delay Time
Figure 4. Error Condition: Watchdog Remains Low and a RESET Is Issued
to Wakeup
to Wakeup
Pulse Width
POR
POR
POR
Watchdog
Figure 3. Power Up, Sleep Mode and Normal Operation
Microprocessor
Sleep Mode
Wakeup
Figure 5. Power Down and Restart Sequence
Period
Watchdog Pulse Width
TIMING DIAGRAMS
RESET High
Delay Time
to Wakeup
http://onsemi.com
RESET Delay Time
Normal Operation with Varying Watchdog Signal
RESET Threshold
Power Down
5
POR
Duty Cycle = 50%
WDI Pulse Must Occur with Wakeup in
Low State for 50% Duty Cycle.
Reference Figure 17 for Occurrence of
WDI with Wakeup in High State.
Wakeup Period
Wakeup