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19-0450; Rev 0; 11/95

Ultra-Low-Power, Open-Drain,

Single/Dual-Supply Comparators

_______________General Description

The MAX971鈥揗AX974 and MAX981鈥揗AX984 single/

dual/quad low-voltage comparators feature the lowest

power consumption available. These micropower

devices draw less than 4碌A(chǔ) supply current over

temperature (MAX971/MAX972, MAX981/MAX982), and

include an internal 1.182V 鹵1% (MAX971/MAX973/

MAX974) or 鹵2% (MAX981鈥揗AX984) voltage reference

and programmable hysteresis.

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

devices operate from a single +2.5V to +11V supply (or

鹵1.25V to 鹵5.5V dual supplies), and each comparator鈥檚

input voltage ranges from the negative supply rail to within

1.3V of the positive supply.

The single MAX971 and MAX981 and the dual MAX973

and MAX982/MAX983 provide a unique, simple method

for adding hysteresis without feedback or complicated

equations, simply by using the HYST pin plus two

resistors.

The MAX971鈥揗AX974 and MAX981鈥揗AX984鈥檚 open-

drain outputs permit wire-ORed configurations. Thanks to

an 11V output range and separate GND pin for the output

transistor (MAX971/MAX974, MAX981/MAX984), these

devices are ideal for level translators and bipolar to single-

ended converters. For similar devices with complementary

output stages, see the MAX921鈥揗AX924 (1% reference)

and the MAX931鈥揗AX934 (2% reference).

COMPARATORS

PER

PACKAGE

____________________________Features

o

碌MAX Package鈥擲mallest 8-Pin SO

(MAX9_1/MAX9_2/MAX9_3)

o

Ultra-Low 4碌A(chǔ) Max Quiescent Current

Over Extended Temp. Range (MAX971/MAX981)

o

Power Supplies: Single +2.5V to +11V

Dual 鹵1.25V to 鹵5.5V

o

Input Voltage Range Includes Negative Supply

o

Internal 1.182V 鹵1% Bandgap Reference

o

12碌s Propagation Delay (10mV Overdrive)

o

Output Has Separate GND Pin (MAX9_1/MAX9_4)

MAX971鈥揗AX974/MAX981鈥揗AX984

________________________Applications

Battery-Powered Systems

Threshold Detectors

Window Comparators

Level Translators

Oscillator Circuits

______________Ordering Information

PART

MAX971CPA

MAX971CSA

MAX971CUA

MAX971C/D

TEMP. RANGE

0擄C to +70擄C

0擄C to +70擄C

0擄C to +70擄C

0擄C to +70擄C

PIN-PACKAGE

8 Plastic DIP

8 SO

8 碌MAX

Dice*

INTERNAL

HYSTERESIS

INTERNAL

PRECISION

REFERENCE

PACKAGE

Ordering Information continued at end of data sheet.

* Dice are tested at T

A

= +25擄C, DC parameters only.

PART

__________Typical Operating Circuit

V

IN

7

V+

3 IN+

OUT 8

4 IN-

MAX971

MAX972

MAX973

MAX974

MAX981

MAX982

MAX983

MAX984

1%

None

1%

1%

2%

2%

2%

2%

1

2

2

4

1

2

2

4

Yes

No

Yes

No

Yes

Yes

Yes

No

8-Pin

DIP/SO/碌MAX

8-Pin

DIP/SO/碌MAX

8-Pin

DIP/SO/碌MAX

16-Pin DIP/SO

8-Pin

DIP/SO/碌MAX

8-Pin

DIP/SO/碌MAX

8-Pin

DIP/SO/碌MAX

16-Pin DIP/SO

5 HYST

6 REF

V-

2

MAX971

MAX981

GND

1

THRESHOLD DETECTOR

1

________________________________________________________________

Maxim Integrated Products

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

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