MAXIM MAX971, MAX974, MAX981, MAX984 Technical data

General Description

The MAX971–MAX974 and MAX981–MAX984 single/
dual/quad low-voltage comparators feature the lowest
power consumption available. These micropower
devices draw less than 4µA supply current over
temperature (MAX971/MAX972/MAX981/MAX982), and
include an internal 1.182V ±1% (MAX971/MAX973/
MAX974) or ±2% (MAX981–MAX984) 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
±1.25V to ±5.5V dual supplies), and each comparator’s
input voltage ranges from the negative supply rail to within

1.3V of the positive supply.

The single MAX971/MAX981 and the dual MAX973/
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–MAX974 and MAX981–MAX984’s open­drain 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 single­ended converters. For similar devices with complementary
output stages, see the MAX921–MAX924 (1% reference)
and the MAX931–MAX934 (2% reference).

Features

♦ Available in Ultra-Small Packages:

UCSP™ (MAX972)
µMAX (MAX9_1/MAX9_2/MAX9_3)

♦ Ultra-Low Quiescent Current (4µA, max)

Over Extended Temp Range (MAX971/MAX981)

♦ Power Supplies:

Single 2.5V to 11V
Dual ±1.25V to ±5.5V

♦ Input Voltage Range Includes Negative Supply

♦ Internal Bandgap Reference

1.182V ±1% (MAX97_)

1.182V ±2% (MAX98_)

♦ 12µs Propagation Delay (10mV Overdrive)

♦ Output Has Separate GND Pin (MAX9_1/MAX9_4)

Applications

MAX971–MAX974/MAX981–MAX984

Ultra-Low-Power, Open-Drain,

Single/Dual-Supply Comparators

________________________________________________________________________________________ 1

Typical Operating Circuit

19-0450; Rev 3; 2/03

Ordering Information continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

PART

INTERNAL

PRECISION

REFERENCE

INTERNAL

HYSTERESIS

PACKAGE

MAX971 1% Yes

8-Pin
DIP/SO/µMAX

MAX972 None No

8-Pin UCSP/
DIP/SO/µMAX

MAX973 1% Yes

8-Pin
DIP/SO/µMAX

MAX974

1% No 16-Pin DIP/SO

MAX981 2% Yes

8-Pin
DIP/SO/µMAX

MAX982 2% Yes

8-Pin
DIP/SO/µMAX

MAX983 2% Yes

8-Pin
DIP/SO/µMAX

MAX984 2% No 16-Pin DIP/SO

COMPARATORS

PER

PACKAGE

1

2

2

4

1

2

2

4

Ordering Information

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.

Battery-Powered
Systems

Threshold Detectors

Window Comparators

Level Translators

Oscillator Circuits

PART TEMP RANGE PIN-PACKAGE

MAX971CPA 0°C to +70°C 8 Plastic Dip

MAX971CSA 0°C to +70°C 8 SO
MAX971CUA 0°C to +70°C 8 µMAX

V

IN

7

V+

3

IN+

IN-

4

HYST

5

REF

6

V-

THRESHOLD DETECTOR

MAX971
MAX981

21

GND

OUT

8

MAX971–MAX974/MAX981–MAX984

Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators

2 _______________________________________________________________________________________

V+ to V-, V+ to GND, GND to V-................................-0.3V, +12V

Inputs

Current: IN_+, IN_-, HYST..............................................20mA

Voltage: IN_+, IN_-, HYST ...............(V+ + 0.3V) to (V- - 0.3V)

Outputs

Current: REF...................................................................20mA

OUT_ ................................................................50mA

Voltage: REF ....................................(V+ + 0.3V) to (V- - 0.3V)

OUT_ (MAX9_1/9_4)..................12V to (GND - 0.3V)

(MAX9_2/9_3).......................12V to (V- - 0.3V)

OUT_ Short-Circuit Duration ..................................Continuous

Continuous Power Dissipation (T

A

= +70°C)

8-Bump UCSP (derate 4.7mW/°C above +70°C) ........379mW

8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ...727mW

8-Pin SO (derate 5.88mW/°C above +70°C)................471mW

8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW

16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)..842mW

16-Pin SO (derate 8.70mW/°C above +70°C) ................696mW

Operating Temperature Ranges

MAX97_C_ _/MAX98_C_ _..................................0°C to +70°C

MAX97_E_ _/MAX98_E_ _ ...............................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Bump Temperature (soldering)

Reflow ..........................................................................+235°C

ELECTRICAL CHARACTERISTICS—5V OPERATION

(V+ = 5V, V- = GND = 0V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

ABSOLUTE MAXIMUM RATINGS

POWER REQUIREMENTS

Supply Voltage Range (Note 2) 2.5 11 V

Output Voltage Range 0 11 V

Supply Current

COMPARATOR

Input Offset Voltage VCM = 2.5V ±10 mV

Input Leakage Current (IN-, IN+) IN+ = IN- = 2.5V C/E temp ranges ±0.01 ±5 nA

Input Leakage Current (HYST) MAX9_1/MAX982/MAX9_3 ±0.02 nA

Input Common-Mode Voltage
Range

Common-Mode Rejection Ratio V- to (V+ - 1.3V) 0.1 1.0 mV/V

Power-Supply Rejection Ratio V+ = 2.5V to 11V 0.1 1.0 mV/V

Voltage Noise 100Hz to 100kHz 20 µV

Hysteresis Input Voltage Range MAX9_1/MAX982/MAX9_3 REF - 0.05 REF V

Response Time (High-to-Low
Transition)

Response Time (Low-to-High
Transition) (Note 3)

PARAMETER CONDITIONS MIN TYP MAX UNITS

MAX9_1,
HYST = REF

IN+ = IN- +
100mV

TA = +25°C, 100pF load,
1MΩ pullup to V+

= +25°C, 100pF load, 1MΩ pullup to V+ 300 µs

T

A

MAX972

MAX982/
MAX9_3,
HYST = REF

MAX9_4

TA = +25°C 2.5 3.2

C/E temp ranges 4

TA = +25°C 2.5 3.2

C/E temp ranges 4

TA = +25°C 3.1 4.5

C/E temp ranges 6

TA = +25°C 5.5 6.5

C/E temp ranges 8.5

V- V+ - 1.3 V

Overdrive = 10mV 12

Overdrive = 100mV 4

µA

RMS

µs

MAX971–MAX974/MAX981–MAX984

Ultra-Low-Power, Open-Drain,

Single/Dual-Supply Comparators

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—5V OPERATION (continued)

(V+ = 5V, V- = GND = 0V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

ELECTRICAL CHARACTERISTICS—3V OPERATION

(V+ = 3V, V- = GND = 0V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Output Low Voltage

Output Leakage Current V

REFERENCE (MAX9_1/MAX982/MAX9_3/MAX9_4 ONLY)

Reference Voltage

Source Current

Sink Current

Voltage Noise 100Hz to 100kHz 100 µV

PARAMETER CONDITIONS MIN TYP MAX UNITS

MAX9_2/MAX9_3, I

MAX9_1/MAX9_4, I

= 11V 100 nA

OUT

MAX971/MAX973/
MAX974

MAX981–MAX984

TA = +25°C1525

C/E temp ranges 6

TA = +25°C815

C/E temp ranges 4

= 1.8mA V- + 0.4

OUT

= 1.8mA

OUT

C temp range 1% 1.170 1.182 1.194

E temp range 2% 1.158 1.206

C temp range 2% 1.158 1.182 1.206

E temp range 3% 1.147 1.217

GND
+ 0.4

POWER REQUIREMENTS

Supply Current

COMPARATOR

Input Offset Voltage VCM = 1.5V ±10 mV

Input Leakage Current (IN-, IN+) IN+ = IN- = 1.5V C/E temp ranges ±0.01 ±5 nA

Input Leakage Current (HYST) MAX9_1/MAX982/MAX9_3 ±0.02 nA

Input Common-Mode Voltage
Range

Common-Mode Rejection Ratio V- to (V+ - 1.3V) 0.2 1 mV/V

Power-Supply Rejection Ratio V+ = 2.5V to 11V 0.1 1 mV/V

Voltage Noise 100Hz to 100kHz 20 µV

Hysteresis Input Voltage Range MAX9_1/MAX982/MAX9_3 REF - 0.05 REF V

PARAMETER CONDITIONS MIN TYP MAX UNITS

TA = +25°C 2.4 3.0

C/E temp ranges 3.8

TA = +25°C 2.4 3.0

C/E temp ranges 3.8

TA = +25°C 3.4 4.3

C/E temp ranges 5.8

TA = +25°C 5.2 6.2

C/E temp ranges 8.0

V- V+ - 1.3 V

HYST = REF,
IN+ = (IN- +
100mV)

MAX9_1

MAX972

MAX982/
MAX9_3

MAX9_4

V

V

µA

µA

RMS

µA

RMS

MAX971–MAX974/MAX981–MAX984

Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—3V OPERATION (continued)

(V+ = 3V, V- = GND = 0V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Note 1: The MAX972EBL is 100% tested at T

A

= +25°C. Temperature limits are guaranteed by design.

Note 2: MAX974/MAX984 comparators work below 2.5V; see Low-Voltage Operation section for more details.
Note 3: Low-to-high response time is the result of the 1MΩ pullup and the 100pF capacitive load, based on three time constants.

A faster response time is achieved with a smaller RC.

Response Time (High-to-Low
Transition)

Response Time (Low-to-High
Transition) (Note 3)

Output Low Voltage

Output Leakage Current V

REFERENCE

Reference Voltage

Source Current

Sink Current

Voltage Noise 100Hz to 100kHz 100 µV

PARAMETER CONDITIONS MIN TYP MAX UNITS

TA = +25°C, 100pF load,
1MΩ pullup to V+

T

= +25°C, 100pF load, 1MΩ pullup to V+ 300 µs

A

MAX9_2/MAX9_3, I

MAX9_1/MAX9_4, I

= 11V 100 nA

OUT

MAX971/MAX973/
MAX974

MAX981–MAX984

TA = +25°C1525

C/E temp ranges 6

TA = +25°C815

C/E temp ranges 4

OUT

OUT

Overdrive = 10mV 12

Overdrive = 100mV 4

= 0.8mA V- + 0.4

= 0.8mA GND + 0.4

C temp range 1% 1.170 1.182 1.194

E temp range 2% 1.158 1.206

C temp range 2% 1.158 1.182 1.206

E temp range 3% 1.147 1.217

µs

V

V

µA

µA

RMS

MAX971–MAX974/MAX981–MAX984

Ultra-Low-Power, Open-Drain,

Single/Dual-Supply Comparators

_______________________________________________________________________________________ 5

__________________________________________Typical Operating Characteristics

(V+ = 5V, V- = GND = 0V, TA = +25°C, unless otherwise noted.)

0

020

OUTPUT VOLTAGE LOW

vs. LOAD CURRENT

0.5

2.5

MAX971-4/981-4-TOC1

LOAD CURRENT (mA)

V

OL

(V)

12

1.5

1.0

48 16

2.0

V+ = 5V

V+ = 3V

1.155
0 5 15 25

REFERENCE OUTPUT VOLTAGE vs.

OUTPUT LOAD CURRENT

1.165

1.185

MAX971-4/981-4 TOC2

OUTPUT LOAD CURRENT (µA)

REFERENCE OUTPUT VOLTAGE (V)

10 20

1.175

1.190

1.160

1.180

1.170

V+ = 5V

OR

V+ = 3V

30

SINK

SOURCE

1.22

1.14

-60 -20 60 140

MAX971/MAX973/MAX974

REFERENCE VOLTAGE vs. TEMPERATURE

1.16

1.20

MAX971-4/981-4 TOC3

TEMPERATURE (°C)

REFERENCE VOLTAGE (V)

20 100

1.18

1.21

1.15

1.19

1.17

-40 0 8040 120

EXTENDED TEMP RANGE

COMMERCIAL

TEMP RANGE

MAX9_1

SUPPLY CURRENT vs.

TEMPERATURE

4.5
IN+ = IN- + 100mV

4.0

V+ = 5V, V- = - 5V

3.5

3.0

SUPPLY CURRENT (µA)

2.5

2.0

V+ = 5V, V- = 0V

-20 20 100

-60 140

TEMPERATURE (°C)

V+ = 3V, V- = 0V

60

4.5

4.0

MAX971-4/981-4 TOC4

3.5

3.0

2.5

SUPPLY CURRENT (µA)

2.0

1.5

SUPPLY CURRENT vs. TEMPERATURE

IN+ = (IN- + 100mV)

V+ = 10V, V- = 0V

-60 140

MAX972

V+ = 5V, V- = 0V

V+ = 3V, V- = 0V

-20 20 100

TEMPERATURE (°C)

60

5.0

4.5

MAX971-4/981-4 TOC5

4.0

3.5

3.0

SUPPLY CURRENT (µA)

2.5

2.0

SUPPLY CURRENT vs. TEMPERATURE

MAX982/MAX9_3

V+ = 5V, V- = 0V

V+ = 3V, V- = 0V

-20 20 100

-60 140

TEMPERATURE (°C)

60

MAX971-4/981-4 TOC6

SUPPLY CURRENT vs. TEMPERATURE

MAX9_4

10

IN+ = (IN- + 100mV)

9

8

7

V+ = 5V, V- = -5V

6

5

SUPPLY CURRENT (µA)

4

3

-60 140

V+ = 3V, V- = 0V

-20 20 100

TEMPERATURE (°C)

V+ = 5V, V- = 0V

60

MAX971-4/981-4 TOC7

MAX9_4

SUPPLY CURRENT vs.

LOW SUPPLY VOLTAGES

10

1

0.1

SUPPLY CURRENT (µA)

0.01

1.0 2.0 2.5

1.5

SINGLE-SUPPLY VOLTAGE (V)

MAX971-4/981-4 TOC8

IN+ - IN- (V)

-20

-40

-60

-80

MAX9_1/MAX982/MAX9_3

HYSTERESIS CONTROL

80

60

OUTPUT HIGH

40

20

0

OUTPUT LOW

010 30 50

NO CHANGE

20 40

V

- V

HYST

(mV)

REF

MAX971-4/981-4 TOC9

Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V+ = 5V, V- = GND = 0V, TA = +25°C, unless otherwise noted.)

1000

1

1.0 2.0 2.2 2.4

RESPONSE TIME

AT LOW SUPPLY VOLTAGES (V

OHL

)

10

100

MAX971-4/981-4 TOC13

SINGLE-SUPPLY VOLTAGE (V)

RESPONSE TIME (µs)

1.2 1.4 1.6 1.8

-20mV

-100mV

R

PULLUP

= 10kΩ

100

0.1

1.0 2.0 2.5

MAX9_4

SINK CURRENT

AT LOW SUPPLY VOLTAGES

1

10

MAX971-4/981-4 TOC14

SINGLE-SUPPLY VOLTAGE (V)

CURRENT (mA)

1.5

SINK CURRENT AT V

OUT

= 0.4V

20

15

0

010

SHORT-CIRCUIT SINK CURRENT

vs. SUPPLY VOLTAGE

MAX971-4/981-4 TOC15

TOTAL SUPPLY VOLTAGE (V)

SINK CURRENT (mA)

5

10

5

25

OUT CONNECTED TO V+

GND CONNECTED TO V-

5.0

0

-0.3 -0.1 0.3

MAX9_1/MAX972/MAX9_4

TRANSFER FUNCTION

1.0

4.0

MAX971-4/981-4 TOC10

IN+ INPUT VOLTAGE (mV)

OUTPUT VOLTAGE (V)

0.1

3.0

2.0

4.5

0.5

3.5

2.5

1.5

-0.2 0

0.2

100kΩ

+5V

10kΩ

V

0

10µF

18

2

0 20 60 100

RESPONSE TIME vs.
LOAD CAPACITANCE

6

14

MAX971-4/981-4 TOC11

LOAD CAPACITANCE (nF)

RESPONSE TIME (µs)

40 80

10

16

4

12

8

V- = 0V

V

OHL

-2 2 10 18

RESPONSE TIME FOR VARIOUS

INPUT OVERDRIVES (V

OHL

)

0

4

MAX971-4/981-4 TOC12

RESPONSE TIME (µs)

V

OUT

(V)

614

2

0

5

100

3

1

50mV

100mV

20mV

10mV

V

IN

(mV)