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Watchdog Timers



DATA SHEETS
Part Number Description Key Advantages
MAX36025 Tamper-Reactive Cryptographic-Node Controller with Nonimprinting Memory

Industry's First Security Manager with Dual Encryption Engines, Authentication, and Tamper-Detection Hierarchy
DS3644 1KB Secure Memory with Programmable Tamper Hierarchy

Industry's First Secure Memory with Tamper-Detection Hierarchy
MAX6746, MAX6747, MAX6748,
...		 µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6323, MAX6324 µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset

Industry's-First µP Supervisory with Windowed Watchdog and Manual Reset
MAX6369, MAX6370, MAX6371,
...		 Pin-Selectable Watchdog Timers



Key Specifications:

Security Managers
Part Number Analog Voltages Monitored Digital Inputs Monitored Internal Key Memory
(Bytes)		 Ext. Memory Cntrl. Random Number Gen. Over Voltage Monitor Battery Monitor RoHS Available Package/Pins Smallest Available Pckg.
(mm2)		 Oper. Temp.
(°C)
max w/pins
DS3644  4 2 1024 Yes Yes Yes Yes Yes
CSBGA/49
 49 -55 to +95
See All Security Managers (10)

Supervisors (1 Monitored Voltage)
Part Number Reset Thresh.
(V)		 Reset Out tRESET Watchdog Feature Watchdog Timeout Supervisor Features Reset Thresh. Accur.
(%)		 ICC
(µA)
min @ +25°C max
MAX6746 
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Push-Pull
1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
<1ms
>1s
Adjustable
Cap Adjustable
Input (WDI)
1s to 2s
<1s
>2s
Adjustable
 Manual Reset 2 10
MAX6747 
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
<1ms
>1s
Adjustable
Cap Adjustable
Input (WDI)
 Manual Reset 2 10
MAX6748 
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Push-Pull
1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
<1ms
>1s
Adjustable
Cap Adjustable
Input (WDI)
 Adjustable Reset Input 2 10
MAX6749 
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
<1ms
>1s
Adjustable
Cap Adjustable
Input (WDI)
 Adjustable Reset Input 2 10
MAX6752 
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Push-Pull
1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
<1ms
>1s
Adjustable
Cap Adjustable
Input (WDI)
Windowed
 - 2 10
MAX6753 
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
<1ms
>1s
Adjustable
Cap Adjustable
Input (WDI)
Windowed
 - 2 10
MAX6323 
2.5 to 3.3
3.3 to 5.5
Active Low
Push-Pull
 85ms to 300ms
Input/Output (WDI/WDO)
Windowed
 Manual Reset 1.5 45
MAX6324 
2.5 to 3.3
3.3 to 5.5
Active Low
Open Drain
 85ms to 300ms
Input/Output (WDI/WDO)
Windowed
 Manual Reset 1.5 45
See All Supervisors (1 Monitored Voltage) (274)

Supervisors (2 Monitored Voltages)
Part Number Interface Reset Thresh.
(V)		 Reset Out tRESET Watchdog Feature Watchdog Timeout Supervisor Features Reset Thresh. Accur.
(%)		 ICC
(µA)
min @ +25°C max
MAX6750 
Factory Fixed
R/C Adjustable
1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active Low
Push-Pull
1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s
<1ms
>1s
Adjustable
Cap Adjustable
Input (WDI)
1s to 2s
<1s
>2s
Adjustable
 Adjustable Reset Input 2 10
MAX6751 
Active Low
Open Drain
See All Supervisors (2 Monitored Voltages) (84)

Watchdog Timers
Part Number Watchdog Feature Watchdog Timeout Watchdog Startup Delay Watchdog Output ICC
(µA)		 RoHS Available Industry Qualified Package/Pins Smallest Available Pckg.
(mm2)		 Oper. Temp.
(°C)
min max max w/pins
MAX6369 
Input (WDI)
Input/Output (WDI/WDO)
Pin Selectable
Watchdog Only
1s to 2s
<1s
>2s
Adjustable
 <60s Open-Drain 20 Yes
Automotive - AECQ100
Automotive - General
SOT/8
 9
-40 to +85
0 to +70
MAX6370  <60s Push-Pull Automotive - General
SOT/8
MAX6371  60s Open-Drain Automotive - General
SOT/8
MAX6372  60s Push-Pull Automotive - General
SOT/8
MAX6373  >60s Open-Drain Automotive - General
SOT/8
MAX6374  >60s Push-Pull
Automotive - AECQ100
Automotive - General
SOT/8
See All Watchdog Timers (9)





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