MAX6841, MAX6842, MAX6843, MAX6844, MAX6845 Ultra-Low-Voltage µP Reset Circuits and Voltage Detectors

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The MAX6841–MAX6845 microprocessor (µP) supervisory circuits monitor ultra-low-voltage power supplies in µP and digital systems. They provide excellent circuit reliability at low cost by eliminating external components and adjustments when used with +0.9V to +1.5V systems. Factory-trimmed reset thresholds are available for the MAX6841/MAX6842. The MAX6843/MAX6844/MAX6845 provide a RESET IN input, allowing the user to externally adjust the reset threshold. The MAX6841–MAX6845 family features a debounced manual reset input (active-low MR). The reset comparator is designed to ignore fast transients on V_CC.

The MAX6841–MAX6845 assert a reset signal whenever the V_CC supply voltage declines below a preset or adjustable threshold or whenever manual reset (active-low MR) is asserted. Reset remains asserted for a fixed timeout delay after V_CC has risen above the reset threshold and when manual reset is deasserted. Five timeout periods are available for each part: 150µs (voltage detector version), 1.5ms, 30ms, 210ms, and 1.68s (typ).

The MAX6841/MAX6843 have an active-low push-pull reset output. The MAX6841/MAX6842/MAX6844 have an active-high push-pull reset output, and the MAX6842/MAX6845 have an active-low open-drain reset output. The active-low open-drain reset output requires a pullup resistor that can be connected to a voltage from 0 to V_CC.

The low supply current (5.7µA) and small package (SOT23-5) make the MAX6841–MAX6845 ideal for use in portable equipment.

Key Features

Applications/Uses

Factory-Set Reset Threshold Voltages for Monitoring Supplies from 0.9V to 1.5V (MAX6841/MAX6842)
Adjustable Threshold RESET IN (MAX6843/MAX6844/MAX6845)
Low Power Consumption: 5.7µA (typ)
±2.5% Reset Threshold Accuracy Over Temperature
Five Timeout Periods: 150µs (Voltage Detector Version), 1.5ms, 30ms, 210ms, and 1.68s
Available in Three Output Configurations
- Push-Pull active-low RESET
- Push-Pull RESET
- Open-Drain active-low RESET
Guaranteed Reset Valid to V_CC = 0.55V (Active Low)
Manual Reset Input
Immune to Short V_CC Transients
Space-Saving 5-Pin SOT23 Package

	Computers
	Controllers
	Critical µP and µC Power Monitoring
	Intelligent Instruments
	Portable Battery-Powered Equipment
	Servers and Workstations
	Telecom/Networking Equipment
	Wireless Base Stations

Key Specifications: Supervisors (1 Monitored Voltage)

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Active-High Reset Output

Min. Reset Timeout Range

Watchdog Feature

Supervisor Features

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

RoHS Available

Package

Operating Temp. Range (°C)

Price^**

MAX6841

0 to 1.2
1.2 to 1.8

Push-Pull

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

No Watchdog

Manual Reset

2.5

Yes

SOT-23/5

-40 to +85
0 to +70

$1.16 @ 1k

MAX6842

0 to 1.2
1.2 to 1.8

Open Drain

Push-Pull

Manual Reset

$1.16 @ 1k

MAX6843

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

Adjustable Reset Input
Manual Reset

$1.16 @ 1k

MAX6844

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

Adjustable Reset Input
Manual Reset

$1.16 @ 1k

MAX6845

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

Adjustable Reset Input
Manual Reset

$1.16 @ 1k

See All Supervisors (1 Monitored Voltage) (268)

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.