MAX6715, MAX6716, MAX6717, MAX6718, MAX6719, MAX6720, MAX6721, MAX6722, MAX6723, MAX6724, MAX6725, MAX6726, MAX6727, MAX6728, MAX6729 Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits

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Description

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The MAX6715-MAX6729 are ultra-low-voltage microprocessor (µP) supervisory circuits designed to monitor two or three system power-supply voltages. These devices assert a system 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 improve system reliability and reduce size compared to separate ICs or discrete components.

These devices monitor primary supply voltages (V_CC1) from 1.8V to 5.0V and secondary supply voltages (V_CC2) from 0.9V to 3.3V with factory-trimmed reset threshold voltage options (see Reset Voltage Threshold Suffix Guide). An externally adjustable RSTIN input option allows customers to monitor a third supply voltage down to 0.62V. These devices are guaranteed to be in the correct reset output logic state when either V_CC1 or V_CC2 remains greater than 0.8V.

A variety of push-pull or open-drain reset outputs along with watchdog input, manual reset input, and power-fail input/output features are available (see Selector Guide). Select reset timeout periods from 1.1ms to 1120ms (min) (see Reset Timeout Period Suffix Guide). The MAX6715-MAX6729 are available in small 5, 6, and 8-pin SOT23 packages and operate over the -40°C to +85°C temperature range.

Key Features

Applications/Uses

V_CC1 (primary supply) Reset Threshold Voltages from 1.58V to 4.63V
V_CC2 (secondary supply) Reset Threshold Voltages from 0.79V to 3.08V
Externally Adjustable RSTIN Threshold for Auxiliary/Triple-Voltage Monitoring (0.62V internal reference)
Watchdog Timer Option
- 35s (min) Long Startup Period
- 1.12s (min) Normal Timeout Period
Manual Reset Input Option
Power-Fail Input/Power-Fail Output Option (Push-Pull and Open-Drain Active-Low)
Guaranteed Reset Valid Down to V_CC1 or V_CC2 = 0.8V
Reset Output Logic Options
Immune to Short V_CC Transients
Low Supply Current 14µA (typ) at 3.6V
Small 5, 6, 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 (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^**

MAX6715

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

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

No Watchdog

Manual Reset

2.5

$1.38 @ 1k

MAX6716

Push-Pull

No Watchdog

Manual Reset

$1.38 @ 1k

MAX6717

Open Drain

No Watchdog

Manual Reset

$1.16 @ 1k

MAX6718

Push-Pull

No Watchdog

Manual Reset

$1.16 @ 1k

MAX6721

Open Drain

Input (WDI)
Extended Setup Period

1s to 2s
>2s

Manual Reset

$1.38 @ 1k

MAX6722

Push-Pull

Input (WDI)
Extended Setup Period

1s to 2s
>2s

Manual Reset

$1.38 @ 1k

MAX6728

Open Drain

Input (WDI)
Extended Setup Period

1s to 2s
>2s

Adjustable Reset Input
Manual Reset
Power Fail Comparator

$1.50 @ 1k

MAX6729

Push-Pull

Input (WDI)
Extended Setup Period

1s to 2s
>2s

Adjustable Reset Input
Manual Reset
Power Fail Comparator

$1.50 @ 1k

See All Supervisors (2 Monitored Voltages) (70)

Key Specifications: Supervisors (3 Monitored Voltages)

Part Number

Interface

Reset Threshold Range (V)

Active-Low Reset Output

Active-High Reset Output

Min. Reset Timeout Range

Watchdog Feature

Nom. Watchdog Timeout Range

Supervisor Features

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

Price^**

MAX6719

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

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

No Watchdog

Adjustable Reset Input
Manual Reset

2.5

$1.38 @ 1k

MAX6720

Push-Pull

No Watchdog

Adjustable Reset Input
Manual Reset

$1.38 @ 1k

MAX6723

Open Drain

Input (WDI)
Extended Setup Period

1s to 2s
>2s

Adjustable Reset Input

$1.38 @ 1k

MAX6724

Push-Pull

Input (WDI)
Extended Setup Period

1s to 2s
>2s

Adjustable Reset Input

$1.38 @ 1k

MAX6725

Open Drain

Input (WDI)
Extended Setup Period

1s to 2s
>2s

Adjustable Reset Input
Manual Reset

$1.50 @ 1k

MAX6726

Push-Pull

Input (WDI)
Extended Setup Period

1s to 2s
>2s

Adjustable Reset Input
Manual Reset

$1.50 @ 1k

MAX6727

Open Drain

Input (WDI)
Extended Setup Period

1s to 2s
>2s

Adjustable Reset Input
Manual Reset

$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.