General Description

The MAX6841–MAX6845 microprocessor (µP) supervi-

sory circuits monitor ultra-low-voltage power supplies in

µP and digital systems. They provide excellent circuit

reliability at low cost by eliminating external compo-

nents and adjustments when used with +0.9V to +1.5V

systems. Factory-trimmed reset thresholds are avail-

able 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 man-

ual reset input (MR). The reset comparator is designed

The MAX6841–MAX6845 assert a reset signal whenev-

adjustable threshold or whenever manual reset (MR) is

asserted. Reset remains asserted for a fixed timeout

when manual reset is deasserted. Five timeout periods

are available for each part: 150µs (voltage detector ver-

sion), 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

The low supply current (5.7µA) and small package

(SOT23-5) make the MAX6841–MAX6845 ideal for use

in portable equipment.

Applications

Computers

Controllers

Intelligent Instruments

Critical µP and µC Power Monitoring

Portable/Battery-Powered Equipment

Telecom/Networking Equipment

Basestations

Servers/Workstations

Features

♦ 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 RESET

Push-Pull RESET

Open-Drain RESET

(Active Low)

♦ Manual Reset Input

♦ Space-Saving 5-Pin SOT23 Package

Ultra-Low-Voltage µP Reset Circuits and

Voltage Detectors

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-2625; Rev 2; 12/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Selector Guide and Typical Operating Circuit appear at end

of data sheet.

PART

TEMP RANGE

PIN-PACKAGE

MAX6841_UKD_-T

-40

°C to +85°C5 SOT23-5

MAX6842_UKD_-T

-40

°C to +85°C5 SOT23-5

MAX6843UKD_-T

-40

°C to +85°C5 SOT23-5

MAX6844UKD_-T

-40

°C to +85°C5 SOT23-5

MAX6845UKD_-T

-40

°C to +85°C5 SOT23-5

GND

RESET

MAX6841

MAX6842

SOT23-5

TOP VIEW

2

34

RESET

MR

( ) ARE FOR 6844

GND

RESET IN

MAX6843

MAX6844

MAX6845

SOT23-5

2

34

RESET

(RESET)

MR

Pin Configurations

Note: Insert desired suffix letter (from the Threshold Suffix Guide

and the Active Timeout Period tables) into the blanks to com-

plete the part number. For example, the MAX6842GUKD1 has a

reset threshold of 1.11V and a typical reset timeout period of

1.5ms. Sample stock is generally available on standard versions

only (see the Standard Versions table). Standard versions

require a minimum order increment of 2.5k units. Nonstandard

versions must be ordered in 10k-unit increments. Contact factory

for availability. All parts are offered in tape-and-reel only.

Devices are available in both leaded and lead-free packaging.

Specify lead-free by replacing “-T” with “+T” when ordering.