MAX6736, MAX6737, MAX6738, MAX6739, MAX6740, MAX6741, MAX6742, MAX6743, MAX6744, MAX6745 Low-Power Dual-/Triple-Voltage SC70 µP Supervisory Circuits

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The MAX6736–MAX6745 are low-power dual-/triple-voltage microprocessor (µP) supervisors. These devices assert a reset if any monitored supply falls below its factory-trimmed or adjustable threshold and maintain reset for a minimum timeout period after all supplies rise above their thresholds. The integrated dual/triple supervisory circuits significantly reduce size and power compared to separate ICs or discrete components. The low supply current of 6µA makes these devices ideal for portable equipment.

The MAX6736/MAX6737 are dual fixed-voltage µP supervisors with a manual reset input. The MAX6738/MAX6739 have one fixed and one adjustable reset threshold and a manual reset input. The MAX6740/MAX6743 are triple-voltage µP supervisors with two fixed and one user-adjustable reset threshold inputs. The MAX6741/MAX6744 are dual-voltage µP supervisors with a power-OK (POK) output ideal for power-supply sequencing. The MAX6742/MAX6745 monitor the primary V_CC supply and have an independent power-fail comparator.

The MAX6736–MAX6745 monitor I/O supply voltages (V_CC1) from 1.8V to 5.0V and core supply voltages (V_CC2) from 0.9V to 3.3V with factory-trimmed reset threshold voltage options (Table 1). An external adjustable RSTIN input option allows monitoring voltages down to 0.5V.

A variety of push-pull or open-drain reset outputs along with manual reset input and power-fail input/output features are available (see the Selector Guide). The MAX6736–MAX6745 are offered in a space-saving 5-pin SC70 package and operate over the -40°C to +85°C temperature range.

Key Features

Applications/Uses

	Dual-/Triple-Supply Reset Voltage Monitors
	Precision Factory-Set Reset Thresholds for Monitoring from 0.9V to 5.0V
	Adjustable Reset Input Down to 0.488V
	150ms and 1200ms (min) Reset Timeout Period Options
	V_CC1 Power-OK Output for Power-Supply Sequencing Applications (MAX6741/MAX6744)
	Power-Fail Input/Power-Fail Output (MAX6742/MAX6745)
	6µA Supply Current
	Tiny SC70 Package

	Controllers
	GPS Equipment
	Multivoltage Systems
	Notebook Computers
	PDAs
	Portable Battery-Powered Equipment
	POS Equipment

Key Specifications: Sequencers/Trackers

Part Number

Option

Interface

Number of Input Channels

Maximum Operating Voltage Range (V)

Features

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX6741

Sequence

Factory Fixed
R/C Adjustable

•	Reset Output

SC-70/5

-40 to +85
0 to +70

$1.50 @ 1k

MAX6744

$1.50 @ 1k

See All Sequencers/Trackers (52)

Key Specifications: Supervisors (1 Monitored Voltage)

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Min. Reset Timeout Range

Watchdog Feature

Supervisor Features

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX6742

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

85ms to 300ms
>1s

No Watchdog

Manual Reset
Power Fail Comparator

SC-70/5

-40 to +85
0 to +70

$1.38 @ 1k

MAX6745

Push-Pull

Power Fail Comparator

$1.38 @ 1k

See All Supervisors (1 Monitored Voltage) (268)

Key Specifications: Supervisors (2 Monitored Voltages)

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Min. Reset Timeout Range

Watchdog Feature

Supervisor Features

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX6736

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

85ms to 300ms
>1s

No Watchdog

Manual Reset

Yes

SC-70/5

-40 to +85
0 to +70

$1.38 @ 1k

MAX6737

Push-Pull

Manual Reset

Yes

$1.38 @ 1k

MAX6738

Open Drain

Adjustable Reset Input
Manual Reset

See Data Sheet

$1.38 @ 1k

MAX6739

Push-Pull

Adjustable Reset Input
Manual Reset

Yes

$1.38 @ 1k

MAX6741

Open Drain

Manual Reset

Yes

$1.50 @ 1k

MAX6744

Push-Pull

Yes

$1.50 @ 1k

See All Supervisors (2 Monitored Voltages) (79)

Key Specifications: Supervisors (3 Monitored Voltages)

Part Number

Interface

Reset Threshold Range (V)

Active-Low Reset Output

Min. Reset Timeout Range

Watchdog Feature

Supervisor Features

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX6740

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

85ms to 300ms
>1s

No Watchdog

Adjustable Reset Input
Manual Reset

Yes

SC-70/5

-40 to +85
0 to +70

$1.50 @ 1k

MAX6743

Push-Pull

Adjustable Reset Input

$1.50 @ 1k

See All Supervisors (3 Monitored Voltages) (21)

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.