MAX6443, MAX6444, MAX6445, MAX6446, MAX6447, MAX6448, MAX6449, MAX6450, MAX6451, MAX6452 µP Reset Circuits with Long Manual Reset Setup Period

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The MAX6443-MAX6452 low-current microprocessor reset circuits feature single or dual manual reset inputs with an extended 6.72s setup period. Because of the extended setup period, short switch closures (nuisance resets) are ignored.

On all devices, the reset output asserts when any of the monitored supply voltages drops below its specified threshold. The reset output remains asserted for the reset timeout period (210ms typ) after all monitored supplies exceed their reset thresholds. The reset output is one-shot pulse asserted for the reset timeout period (140ms min) when selected manual reset input(s) are held low for an extended setup timeout period of 6.72s. These devices ignore manual reset transitions of less than 6.72s (typ).

The MAX6443-MAX6448 are single fixed-voltage µP supervisors. The MAX6443/MAX6444 have a single extended manual reset input. The MAX6445/MAX6446 have two extended manual reset inputs. The MAX6447/ MAX6448 have one extended and one immediate manual reset input.

The MAX6449-MAX6452 have one fixed-threshold µP supervisor and one adjustable-threshold µP supervisor. The MAX6449/MAX6450 have two delayed manual reset inputs. The MAX6451/MAX6452 have one delayed and one immediate manual reset input.

The MAX6443-MAX6452 have an active-low RESET with push-pull or open-drain output logic options. These devices, offered in small SOT packages, are fully guaranteed over the extended temperature range (-40°C to +85°C).

Key Features

Applications/Uses

Single- or Dual-Supply Voltage Monitors
Precision Factory-Set Reset Thresholds from 1.6V to 4.6V
Adjustable Threshold to Monitor Voltages Down to 0.63V (MAX6449-MAX6452)
Single or Dual Manual Reset Inputs with Extended 6.72s Setup Period
Optional Short Setup Time Manual Reset Input (MAX6447/MAX6448 and MAX6451/MAX6452)
Immune to Short Voltage Transients
Low 6µA Supply Current
Guaranteed Valid Reset Down to V_CC = 1.0V
Active-Low RESET (Push-Pull or Open-Drain) Outputs
140ms (min) Reset Timeout Period
Small SOT143 and SOT23 Packages

	Automotive
	Consumer Electronics
	DVD Players
	Industrial Equipment
	Medical Devices
	Modems
	MP3 Players
	Set-Top Boxes

Key Specifications: Pushbutton Devices

Part Number

Number of Monitored Voltages

Manual Reset Feature

MR1 Setup Time

MR2 Setup Time

Reset Threshold Range (V)

Active-Low Reset Output

Min. Reset Timeout Range

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

Package

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

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX6443

Extended Setup Period

6.72s

1.2 to 1.79
1.8 to 2.49
2.5 to 3.29
3.3 to 4.99

Push-Pull

85ms to 300ms

2.5

SOT-143/4

Yes

-40 to +85
0 to +70

$0.99 @ 1k

MAX6444

Open Drain

SOT-143/4

$0.99 @ 1k

MAX6445

6.72s

Push-Pull

SOT-23/5

$1.09 @ 1k

MAX6446

6.72s

Open Drain

SOT-23/5

$1.09 @ 1k

MAX6447

1µs

Push-Pull

SOT-23/5

$1.09 @ 1k

MAX6448

1µs

Open Drain

SOT-23/5

$1.09 @ 1k

MAX6449

6.72s

Push-Pull

SOT-23/6

$1.50 @ 1k

MAX6450

6.72s

Open Drain

SOT-23/6

$1.50 @ 1k

MAX6451

1µs

Push-Pull

SOT-23/6

$1.50 @ 1k

MAX6452

1µs

Open Drain

SOT-23/6

$1.50 @ 1k

See All Pushbutton Devices (17)

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.