September 2004

1

MIC841/2

MIC841/2

Micrel

MIC841/842

Comparator with Reference

Typical Application

HTH

OUT

VDD

LTH

GND

MIC841

R1

R2

R3

1.5V

≤ V

5

3

1

4

2

Threshold Detection with Hysteresis Set by a Third

External Resistor

Features

• Optimized for PDAs, cellular telephones, pagers,

and other battery-powered devices

• Output can be pulled up to 6V regardless of supply

voltage (841NBC5 only)

• High

±1.25% voltage threshold accuracy

• Built in hysteresis for noise suppression

(MIC842)

• Extremely low 1.5

µA typical supply current

• Immune to brief input transients

• Teeny™ 5-lead SC-70 package

Applications

• PDAs

• Pagers

• Cordless phones

• Consumer electronics

• Embedded controllers

• Personal electronics

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

General Description

The MIC841 and MIC842 are micropower, precision voltage

comparators with an on-chip voltage reference.

Both devices are intended for voltage monitoring applications.

External resistors are used to set the voltage monitor threshold.

When the threshold is crossed, the outputs switch polarity.

The MIC842 incorporates a voltage reference and comparator

with fixed internal hysteresis; two external resistors are used to

set the switching threshold voltage. The MIC841 provides a

similar function with user adjustable hysteresis; this part re-

quires three external resistors to set the upper and lower

thresholds (the difference between the threshold voltages

being the hysteresis voltage).

Both the MIC841 and MIC842 are available with push-pull or

open-drain output stage. The push-pull output stage is config-

ured either active high or active low; the open-drain output stage

is only configured active high.

Supply current is extremely low (1.5

µA, typical), making it ideal

for portable applications.

The MIC841/2 is supplied in Micrel’s Teeny™ 5-lead SC-70

package.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Teeny™ is a trademark of Micrel, Inc.

INP

OUT

VDD

GND

MIC842

R1

R2

1.5V

≤ V

4

2

1

5

Threshold Detector with Internal Fixed Hysteresis

Teeny™