Automatic Teller Machine (ATM) Systems



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Maxim > Solutions > Automatic Teller Machine (ATM) Systems

Watchdog Timers

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Key Advantages

8k x 8 Secure Memory with Programmable Tamper-Response Hierarchy and RTC
DS3665

Industry's First 8kB Secure Memory with Tamper-Response Hierarchy

1k x 8 Secure Memory with Programmable Tamper-Detection Hierarchy and RTC
DS3644

Industry's First Secure Memory with Tamper-Detection Hierarchy

QV PDF

µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay
MAX6746, MAX6747, MAX6748, MAX6749, MAX6750, MAX6751, MAX6752, MAX6753

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µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset
MAX6323, MAX6324

Industry's-First µP Supervisory with Windowed Watchdog and Manual Reset

QV PDF

Pin-Selectable Watchdog Timers
MAX6369, MAX6370, MAX6371, MAX6372, MAX6373, MAX6374

Key Specifications: Supervisors (1 Monitored Voltage)

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Min. Reset Timeout Range

Watchdog Feature

Nom. Watchdog Timeout Range

Supervisor Features

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

MAX6746

1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Push-Pull

15ms to 85ms
1ms to 15ms
300ms to 1s
85ms to 300ms
<1ms
>1s
Adjustable

Input (WDI)
Cap Adjustable

1s to 2s
<1s
>2s
Adjustable

Manual Reset

MAX6747

1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Open Drain

15ms to 85ms
1ms to 15ms
300ms to 1s
85ms to 300ms
<1ms
>1s
Adjustable

Input (WDI)
Cap Adjustable

1s to 2s
<1s
>2s
Adjustable

Manual Reset

MAX6748

1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Push-Pull

15ms to 85ms
1ms to 15ms
300ms to 1s
85ms to 300ms
<1ms
>1s
Adjustable

Input (WDI)
Cap Adjustable

1s to 2s
<1s
>2s
Adjustable

Adjustable Reset Input

MAX6749

1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Open Drain

15ms to 85ms
1ms to 15ms
300ms to 1s
85ms to 300ms
<1ms
>1s
Adjustable

Input (WDI)
Cap Adjustable

1s to 2s
<1s
>2s
Adjustable

Adjustable Reset Input

MAX6752

1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Push-Pull

15ms to 85ms
1ms to 15ms
300ms to 1s
85ms to 300ms
<1ms
>1s
Adjustable

Input (WDI)
Cap Adjustable
Windowed

1s to 2s
<1s
>2s
Adjustable

MAX6753

1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Open Drain

15ms to 85ms
1ms to 15ms
300ms to 1s
85ms to 300ms
<1ms
>1s
Adjustable

Input (WDI)
Cap Adjustable
Windowed

1s to 2s
<1s
>2s
Adjustable

MAX6323

2.5 to 3.3
3.3 to 5.5

Push-Pull

85ms to 300ms

Input/Output (WDI/WDO)
Windowed

1s to 2s
<1s
>2s
Adjustable

Manual Reset

1.5

MAX6324

2.5 to 3.3
3.3 to 5.5

Open Drain

85ms to 300ms

Input/Output (WDI/WDO)
Windowed

1s to 2s
<1s
>2s
Adjustable

Manual Reset

1.5

See All Supervisors (1 Monitored Voltage) (268)

Key Specifications: Supervisors (2 Monitored Voltages)

Part Number

Interface

Reset Threshold Range (V)

Active-Low Reset Output

Min. Reset Timeout Range

Watchdog Feature

Nom. Watchdog Timeout Range

Supervisor Features

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

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

Push-Pull

15ms to 85ms
1ms to 15ms
300ms to 1s
85ms to 300ms
<1ms
>1s
Adjustable

Input (WDI)
Cap Adjustable

1s to 2s
<1s
>2s
Adjustable

Adjustable Reset Input

MAX6751

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

Open Drain

15ms to 85ms
1ms to 15ms
300ms to 1s
85ms to 300ms
<1ms
>1s
Adjustable

Input (WDI)
Cap Adjustable

1s to 2s
<1s
>2s
Adjustable

Adjustable Reset Input

See All Supervisors (2 Monitored Voltages) (70)

Key Specifications: Watchdog Timers
Part Number	Watchdog Feature	Nom. Watchdog Timeout Range	Min. Watchdog Startup Delay	Watchdog Output	Max. I_CC (µA)	Industry Qualified	Package	Operating Temp. Range (°C)
MAX6369	Input (WDI) Input/Output (WDI/WDO) Pin Selectable Watchdog Only	1s to 2s <1s >2s Adjustable	<60s	Open-Drain	20	Automotive - General	SOT-23/8	-40 to +85 0 to +70
MAX6370	Input (WDI) Input/Output (WDI/WDO) Pin Selectable Watchdog Only	1s to 2s <1s >2s Adjustable	<60s	Push-Pull	20	Automotive - General	SOT-23/8	-40 to +85 0 to +70
MAX6371	Input (WDI) Input/Output (WDI/WDO) Pin Selectable Watchdog Only	1s to 2s <1s >2s Adjustable	60s	Open-Drain	20	Automotive - General	SOT-23/8	-40 to +85 0 to +70
MAX6372	Input (WDI) Input/Output (WDI/WDO) Pin Selectable Watchdog Only	1s to 2s <1s >2s Adjustable	60s	Push-Pull	20	Automotive - General	SOT-23/8	-40 to +85 0 to +70
MAX6373	Input (WDI) Input/Output (WDI/WDO) Pin Selectable Watchdog Only	1s to 2s <1s >2s Adjustable	>60s	Open-Drain	20	Automotive - General	SOT-23/8	-40 to +85 0 to +70
MAX6374	Input (WDI) Input/Output (WDI/WDO) Pin Selectable Watchdog Only	1s to 2s <1s >2s Adjustable	>60s	Push-Pull	20	Automotive - General	SOT-23/8	-40 to +85 0 to +70
See All Watchdog Timers (7)