MAX16997AAUA+ Maxim Integrated Products, MAX16997AAUA+ Datasheet - Page 8

• Manufacturer Part Number: MAX16997AAUA+
• Description: IC TIMER WATCHDOG 8-UMAX
• Manufacturer: Maxim Integrated Products
• Type: Watchdog Circuitr

Specifications of MAX16997AAUA+

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: Adjustable/Selectable
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-Voltage Watchdog Timers with
Adjustable Timeout Delay
Figure 3. MAX16998B/D Timing Diagram
Figure 4. RESETIN, RESET , V
8
V
V
ENABLE
V
IN
RESETIN
RESET
PON
_______________________________________________________________________________________
= ENABLE
WDI
V
RESETIN
RESET
1.1V
V
PON
WDI
t = 0
t
3 CONSECUTIVE RESETS ENABLE GOES ACTIVE LOW
RESET
t
RESET
= RESET TIMEOUT PERIOD
t
RESET
t
CW
t
WP
t
t
WDI
OW
t
OW
t
WDI
t
WP
IN
t
CW
, ENABLE , and WDI Voltage Monitoring
t
WDI
≤ t
WDI
t
t
WDI
WDI
≤ t
WP
t
WDI
t
V
OW
HYST
PROPER WATCHDOG TRIGGER RESETS THE INTERNAL ENABLE COUNTER
t
= T OPEN WINDOW
CW
t
WDI
1
V
HYST
ENABLE DOES NOT GET ASSERTED IF THE VOLTAGE
AT RESETIN IS BELOW ITS THRESHOLD.
t
WP
t
RRDL
3 CONSECUTIVE WATCHDOG TRIGGER (WDI) ENABLE GOES ACTIVE HIGH
2
t
CW
= T CLOSED WINDOW
t
WP
WHENEVER RESET IS ASSERTED.
THE WATCHDOG TIMER CLEARS
3
Timing Diagrams (continued)
t
RESET
t
t
WP
WP
= t
CW
t
WP
+ t
OW
t
RESET
t
WDI
t
WDI
t
WDI
= WDI TRIGGER PERIOD
1
t
WDI
t
WDI
t
CW
2
≤ t
t
WDI
WDI
≤ t
WP
3