QuickView - MAX6730, MAX6731, MAX6732, MAX6733, MAX6734, MAX6735 Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output

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Description

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The MAX6730-MAX6735 single-/dual-/triple-voltage microprocessor (µP) supervisors feature a watchdog timer and manual reset capability. The MAX6730-MAX6735 offer factory-set reset thresholds for monitoring voltages from +0.9V to +5V and an adjustable reset input for monitoring voltages down to +0.63V. The combination of these features significantly improves system reliability and accuracy when compared to separate ICs or discrete components.

The active-low reset output asserts and remains asserted for the reset timeout period after all the monitored voltages exceed their respective thresholds. Multiple factoryset reset threshold combinations reduce the number of external components required. The MAX6730/MAX6731 monitor a single fixed voltage, the MAX6732/MAX6733 monitor two fixed voltages, and the MAX6734/MAX6735 monitor two fixed voltages and one adjustable voltage. All devices are offered with six minimum reset timeout periods ranging from 1.1ms to 1120ms.

The MAX6730-MAX6735 feature a watchdog timer with an independent watchdog output. The watchdog timer prevents system lockup during code execution errors. A watchdog startup delay of 54s after reset asserts allows system initialization during power-up. The watchdog operates in normal mode with a 1.68s delay after initialization. The MAX6730/MAX6732/MAX6734 provide an active-low, open-drain watchdog output. The MAX6731/MAX6733/MAX6735 provide an active-low, push-pull watchdog output.

Other features include a manual reset input (MAX6730/MAX6731/MAX6734/MAX6735) and push-pull reset output (MAX6731/MAX6733/MAX6735) or open-drain reset output (MAX6730/MAX6732/MAX6734). The MAX6730-MAX6733 are offered in a tiny SOT23-6 package. The MAX6734/MAX6735 are offered in a space-saving SOT23-8 package. All devices are fully specified over the extended -40°C to +85°C temperature range.

Key Features

Applications/Uses

V_CC1 (Primary Supply) Reset Threshold Voltages from +1.575V to +4.63V
V_CC2 (Secondary Supply) Reset Threshold Voltages from +0.79V to +3.08V
Adjustable RSTIN Threshold for Monitoring Voltages Down to +0.63V (MAX6734/MAX6735 Only)
Six Reset Timeout Options
Watchdog Timer with Independent Watchdog Output
- 35s (min) Initial Watchdog Startup Period
- 1.12s (min) Normal Watchdog Timeout Period
Manual Reset Input (MAX6730/MAX6731/MAX6734/MAX6735)
Guaranteed Reset Valid down to V_CC1 or V_CC2 = +0.8V
Push-Pull active-low RESET or Open-Drain active-low RESET Output
Immune to Short V_CC Transients
Low Supply Current: 14µA (typ) at +3.6V
Small 6-Pin and 8-Pin SOT23 Packages

	Computers/Servers
	Industrial Equipment
	Multivoltage Systems
	Portable Battery-Powered Equipment
	Printers and Faxes
	Set-Top Boxes
	Telecom/Networking Equipment

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)

Price^**

MAX6730

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
>1s

Extended Setup Period
Input (WDI)
Input/Output (WDI/WDO)

1s to 2s
>2s

Manual Reset

2.5

$1.31 @ 1k

MAX6731

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
>1s

Extended Setup Period
Input (WDI)
Input/Output (WDI/WDO)

1s to 2s
>2s

Manual Reset

2.5

$1.31 @ 1k

See All Supervisors (1 Monitored Voltage) (270)

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

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

MAX6732

Factory Fixed

0 to 1.2
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
>1s

Extended Setup Period
Input (WDI)
Input/Output (WDI/WDO)

1s to 2s
>2s

2.5

MAX6733

Factory Fixed

0 to 1.2
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
>1s

Extended Setup Period
Input (WDI)
Input/Output (WDI/WDO)

1s to 2s
>2s

2.5

See All Supervisors (2 Monitored Voltages) (84)

Key Specifications: Supervisors (3 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)

Price^**

MAX6734

Factory Fixed
R/C Adjustable

0 to 1.2
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
>1s

Extended Setup Period
Input (WDI)
Input/Output (WDI/WDO)

1s to 2s
>2s

Adjustable Reset Input
Manual Reset

2.5

$1.79 @ 1k

MAX6735

Push-Pull

$1.79 @ 1k

See All Supervisors (3 Monitored Voltages) (32)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.