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

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The MAX6746–MAX6753 low-power microprocessor (µP) supervisory circuits monitor single/dual system supply voltages from 1.575V to 5V and provide maximum adjustability for reset and watchdog functions. These devices assert a reset signal whenever the V_CC supply voltage or RESET IN falls below its reset threshold or when manual reset is pulled low. The reset output remains asserted for the reset timeout period after V_CC and RESET IN rise above the reset threshold. The reset function features immunity to power-supply transients.

The MAX6746–MAX6753 have ±2% factory-trimmed reset threshold voltages in approximately 100mV increments from 1.575V to 5.0V and/or adjustable reset threshold voltages using external resistors.

The reset and watchdog delays are adjustable with external capacitors. The MAX6746–MAX6751 contain a watchdog select input that extends the watchdog timeout period by 128x. The MAX6752/MAX6753 contain a window watchdog timer that looks for activity outside an expected window of operation.

The MAX6746–MAX6753 are available with a push-pull or open-drain active-low RESET output. The MAX6746–MAX6753 are available in an 8-pin SOT23 package and are fully specified over the automotive temperature range (-40°C to +125°C).

Key Features

Applications/Uses

	Factory-Set Reset Threshold Options from 1.575V to 5V in ~100mV Increments
	Adjustable Reset Threshold Options
	Single/Dual Voltage Monitoring
	Capacitor-Adjustable Reset Timeout
	Capacitor-Adjustable Watchdog Timeout
	Min/Max (Windowed) Watchdog Option
	Manual Reset Input Option
	Guaranteed Active-Low RESET Valid for V_CC > 1V
	3.7µA Supply Current
	Push-Pull or Open-Drain Active-Low RESET Output Options
	Power-Supply Transient Immunity
	Small 8-Pin SOT23 Packages

	Automotive
	Battery-Powered Computers/Controllers
	Computers
	Critical µP Monitoring
	Embedded Controllers
	Intelligent Instruments
	Medical Equipment
	Portable Equipment
	Set-Top Boxes

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^**

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

$1.20 @ 1k

MAX6747

Open Drain

Input (WDI)
Cap Adjustable

Manual Reset

$1.20 @ 1k

MAX6748

Push-Pull

Input (WDI)
Cap Adjustable

Adjustable Reset Input

$1.20 @ 1k

MAX6749

Open Drain

Input (WDI)
Cap Adjustable

Adjustable Reset Input

$1.20 @ 1k

MAX6752

Push-Pull

Input (WDI)
Cap Adjustable
Windowed

$1.50 @ 1k

MAX6753

Open Drain

Input (WDI)
Cap Adjustable
Windowed

$1.50 @ 1k

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)

Price^**

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

$1.50 @ 1k

MAX6751

Open Drain

$1.50 @ 1k

See All Supervisors (2 Monitored Voltages) (70)

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.