Automatic Teller Machine (ATM) Systems



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Maxim > Solutions > Automatic Teller Machine (ATM) Systems

Watchdog Timers

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Title/Parts

Key Advantages

1k x 8 Secure Memory with Programmable Tamper-Detection Hierarchy and RTC
MAX36025B, MAX36025B+TRL

Industry's First Security Manager with Dual Encryption Engines, Authentication, and Tamper-Detection Hierarchy

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

QV PDF

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 Thresh.
(V)

Reset Out

t_RESET

Watchdog Feature

Watchdog Timeout

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(µA)

Active Low

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

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

MAX6747

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Open Drain

1ms to 15ms

15ms to 85ms

85ms to 300ms

300ms to 1s

<1ms

>1s

Adjustable

Cap Adjustable

Input (WDI)

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

1ms to 15ms

15ms to 85ms

85ms to 300ms

300ms to 1s

<1ms

>1s

Adjustable

Cap Adjustable

Input (WDI)

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

1ms to 15ms

15ms to 85ms

85ms to 300ms

300ms to 1s

<1ms

>1s

Adjustable

Cap Adjustable

Input (WDI)

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

1ms to 15ms

15ms to 85ms

85ms to 300ms

300ms to 1s

<1ms

>1s

Adjustable

Cap Adjustable

Input (WDI)

Windowed

MAX6753

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Open Drain

1ms to 15ms

15ms to 85ms

85ms to 300ms

300ms to 1s

<1ms

>1s

Adjustable

Cap Adjustable

Input (WDI)

Windowed

MAX6323

2.5 to 3.3

3.3 to 5.5

Push-Pull

85ms to 300ms

Input/Output (WDI/WDO)

Windowed

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

Manual Reset

1.5

See All Supervisors (1 Monitored Voltage) (274)

Key Specifications: Supervisors (2 Monitored Voltages)

Part Number

Interface

Reset Thresh.
(V)

Reset Out

t_RESET

Watchdog Feature

Watchdog Timeout

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(µA)

Active Low

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

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

MAX6751

Open Drain

See All Supervisors (2 Monitored Voltages) (84)

Key Specifications: Watchdog Timers

Part Number

Watchdog Feature

Watchdog Timeout

Watchdog Startup Delay

Watchdog Output

I_CC
(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

Yes

Automotive - General

SOT/8

-40 to +85

0 to +70

MAX6370

<60s

Push-Pull

SOT/8

MAX6371

60s

Open-Drain

SOT/8

MAX6372

60s

Push-Pull

SOT/8

MAX6373

>60s

Open-Drain

SOT/8

MAX6374

>60s

Push-Pull

SOT/8

See All Watchdog Timers (7)