General Description

The MXD1810–MXD1813/MXD1815–MXD1818 family of

microprocessor (µP) reset circuits monitor power sup-

plies in µP and digital systems. These devices provide

excellent circuit reliability and low cost by eliminating

external components and adjustments when used with

+2.5V/+3.0V/+3.3V (MXD1815–MXD1818), and +5V

(MXD1810–MXD1813) systems.

supply voltage declines below a preset threshold,

rises above the reset threshold. The MXD1813/

MXD1818 also keep reset asserted for at least 100ms

after the output is momentarily pulled to GND by an

external push-button switch.

The MXD1812/MXD1817 have an active-high push-pull

RESET output. The MXD1810/MXD1815 (push-pull) and

MXD1811/MXD1813/MXD1816/MD1818 (open-drain)

have an active-low RESET output. The open-drain

devices (MXD1811/MXD1813/MXD1816/MXD1818)

MXD1813/MXD1818 feature a debounced manual reset

feature that asserts a reset if the RESET pin is pulled

low for more than 1.5µs. When used to initiate manual

reset, RESET debounces signals from devices such as

mechanical switches. For devices with this feature, the

release of the external switch triggers the reset period.

The MXD1810–MXD1813/MXD1815–MXD1818 are

down to +1V. These ICs provide a reset comparator

thresholds are available between +2.18V and +4.62V.

These small, low-power (4µA) devices are ideal for use

in portable equipment. All are available in space-saving

3-pin SC70 and SOT23 packages, and are specified

from -40°C to +105°C.

Applications

Computers and Controllers

Intelligent Instruments

Set-Top Boxes

Printers

Automotive Systems

Critical µP and µC Monitoring

Portable/Battery-Powered Equipment

Features

o Precision Monitoring of +2.5V, +3V, +3.3V, and

+5V Power-Supply Voltages

o Available in Four Reset Output Configurations

o Factory-Set Reset Threshold Voltages: 2.18V,

2.31V, 2.55V, 2.88V, 3.06V, 4.12V, 4.37V, 4.62V

o ±2.5% Reset Threshold Accuracy Over

Temperature

o Fixed Reset Timeout Period: 100ms (min)

o Debounced Manual Reset Detect

(MXD1813/MXD1818)

o Power-Supply Transient Immunity

o No External Components

o Low Power Consumption (4µA)

o Pin Compatible with DS181_ Products (SOT23)

o 3-Pin SC70 and SOT23 Packages

Low-Power µP Reset Circuits in 3-Pin

SC70/SOT23

________________________________________________________________ Maxim Integrated Products

1

RESET

(RESET)

1

3

GND

MXD181_X

SC70-3

TOP VIEW

2

() ARE FOR THE MXD1812/MXD1817

RESET

(RESET)

1

3

GND

MXD181_U

SOT23-3

2

Pin Configurations

Ordering Information

19-2243; Rev 0; 10/01

Ordering Information continued at end of data sheet.

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.

PART

†

TEMP. RANGE

PIN-PACKAGE

MXD1810UR_ _-T

-40

3 SOT23-3

MXD1810XR_ _-T

-40

3 SC70-3

(MXD1815–MXD1818) and +4.12V to +4.62V (MXD1810–

MXD1813). Choose the desired reset-threshold suffix from the

Reset Threshold Table and insert it in place of the “_ _” follow-

ing “R” in the part number. All devices are available in tape-

and-reel only in 2500 unit increments. Other threshold voltages

may be available. Contact factory for availability.

*Patent pending