MIC841/842

Comparator with 1.25% Reference

and Adjustable Hysteresis

Teeny™ is a trademark of Micrel, Inc.

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 requires 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

configured either active high or active low; the open-drain

output stage is only configured active low.

Supply current is extremely low (1.5μA, typical), making it

ideal for portable applications.

The MIC841/2 is supplied in Micrel’s Teeny™ 5-pin

SC-70 package.

Data sheets and support documentation are found on the

Micrel web site: www.micrel.com.

Features

• 1.5V to 5.5V operating range

• 1.5μA typical supply current

• ±1.25% voltage threshold accuracy

• 10nA max input leakage current over temperature

• 10µs propagation delay

• Externally adjustable hysteresis (MIC841)

• Internal 20mV hysteresis (MIC842)

• Output options

- Push-pull, active high

- Push-pull, active low

- Open drain, active low

• Immune to brief input transients

• Teeny™ 5-pin SC-70 package

Applications

• Smart phones

• PDAs

• Precision battery monitoring

• Battery chargers

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Typical Application

Threshold Detection with

Adjustable Hysteresis

Threshold Detector with

Internal Fixed Hysteresis

March 2011

M9999-030811-B