_______________General Description

The MAX921–MAX924 single, dual, and quad micro-

power, low-voltage comparators feature the lowest

power consumption available. These comparators draw

less than 4µA supply current over temperature

(MAX921/MAX922), and include an internal 1.182V

±1% voltage reference, programmable hysteresis, and

TTL/CMOS outputs that sink and source current.

Ideal for 3V or 5V single-supply applications, the

MAX921–MAX924 operate from a single +2.5V to +11V

supply (or a ±1.25V to ±5V dual supply), and each

comparator’s input voltage range swings from the

negative supply rail to within 1.3V of the positive

supply.

The MAX921–MAX924’s unique output stage con-

tinuously sources as much as 40mA. And by eliminating

power-supply glitches that commonly occur when com-

parators change logic states, the MAX921–MAX924

minimize parasitic feedback, which makes them easier to

use.

The single MAX921 and dual MAX923 provide a unique

and simple method for adding hysteresis without

feedback and complicated equations, simply by using

the HYST pin and two resistors.

________________________Applications

Battery-Powered Systems

Threshold Detectors

Window Comparators

Oscillator Circuits

____________________________Features

o µMAX Package—Smallest 8-Pin SO

(MAX921/MAX922/MAX923)

o Ultra-Low 4µA Max Quiescent Current

Over Extended Temp. Range (MAX921)

o Power Supplies:

Single +2.5V to +11V

Dual ±1.25V to ±5.5V

o Input Voltage Range Includes Negative Supply

o Internal 1.182V ±1% Bandgap Reference

o Adjustable Hysteresis

o TTL/CMOS-Compatible Outputs

o 12µs Propagation Delay (10mV Overdrive)

o No Switching Crowbar Current

o 40mA Continuous Source Current

______________Ordering Information

Ordering Information continued at end of data sheet.

*

** Contact factory for availability and processing to MIL-STD-883.

Ultra Low-Power,

Single/Dual-Supply Comparators

________________________________________________________________

Maxim Integrated Products

1

MAX921

OUT

IN+

HYST

REF

V-

GND

V+

21

4

5

6

8

3

7

IN-

THRESHOLD DETECTOR

__________Typical Operating Circuit

Call toll free 1-800-998-8800 for free samples or literature.

19-0115; Rev 3; 3/95

PART

TEMP. RANGE

PIN-PACKAGE

MAX921CPA

0°C to +70°C

8 Plastic DIP

MAX921CSA

0°C to +70°C

8 SO

MAX921C/D

0°C to +70°C

Dice*

MAX921

Yes

1

Yes

8-Pin

DIP/SO/µMAX

MAX922

No

2

No

8-Pin

DIP/SO/µMAX

MAX923

Yes

2

Yes

8-Pin

DIP/SO/µMAX

MAX924

Yes

4

No

16-Pin

DIP/SO/µMAX

MAX921EPA

-40°C to +85°C

8 Plastic DIP

MAX921ESA

-40°C to +85°C

8 SO

MAX921MJA

-55°C to +125°C

8 CERDIP**

MAX921CUA

0°C to +70°C

8 µMAX