Rainbow Electronics MAX924 User Manual

19-0115; Rev 3; 3/95

Ultra Low-Power,

Single/Dual-Supply Comparators

_______________General Description

The MAX921–MAX924 single, dual, and quad micropower, 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 continuously sources as much as 40mA. And by eliminating power-supply glitches that commonly occur when comparators 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.

PART

INTERNAL 1%

PRECISION

REFERENCE

COMPARATORS

PER

PACKAGE

INTERNAL

HYSTERESIS

MAX921 Yes 1 Yes

MAX922 No 2 No

MAX923 Yes 2 Yes

MAX924 Yes 4 No

PACKAGE

8-Pin DIP/SO/µMAX

16-Pin DIP/SO/µMAX

________________________Applications

Battery-Powered Systems Threshold Detectors Window Comparators Oscillator Circuits

____________________________Features

♦ µMAX Package—Smallest 8-Pin SO

(MAX921/MAX922/MAX923)

♦ Ultra-Low 4µA Max Quiescent Current

Over Extended Temp. Range (MAX921)

♦ Power Supplies:

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

♦ Input Voltage Range Includes Negative Supply ♦ Internal 1.182V ±1% Bandgap Reference ♦ Adjustable Hysteresis ♦ TTL/CMOS-Compatible Outputs ♦ 12µs Propagation Delay (10mV Overdrive) ♦ No Switching Crowbar Current ♦ 40mA Continuous Source Current

______________Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX921CPA

MAX921CSA 0°C to +70°C 8 SO MAX921CUA 0°C to +70°C 8 µMAX MAX921C/D 0°C to +70°C Dice* 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**

Ordering Information continued at end of data sheet.

* Dice are tested at T ** Contact factory for availability and processing to MIL-STD-883.

0°C to +70°C 8 Plastic DIP

= +25°C, DC parameters only.

__________Typical Operating Circuit

V+

IN+

OUT

IN-

HYST

REF

THRESHOLD DETECTOR

MAX921

V-

GND

MAX921–MAX924

________________________________________________________________

Maxim Integrated Products

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

Ultra Low-Power, Single/Dual-Supply Comparators

ABSOLUTE MAXIMUM RATINGS

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

Current, OUT_.................................................................50mA

Voltage, REF ....................................(V+ + 0.3V) to (V- – 0.3V)

Voltage, OUT_ (MAX921/924).....(V+ + 0.3V) to (GND – 0.3V)

Voltage OUT_ (MAX922/923)...........(V+ + 0.3V) to (V- – 0.3V)

OUT_ Short-Circuit Duration (V+ ≤ 5.5V) ...............Continuous

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

MAX921–MAX924

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS: 5V OPERATION

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

PARAMETER

POWER REQUIREMENTS

Supply Voltage Range

Supply Current IN+ = IN- + 100mV

COMPARATOR

Input Offset Voltage

Input Leakage Current (HYST) Input Common-Mode Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Voltage Noise Hysteresis Input Voltage Range REF- 0.05V REF V

to T

MIN

, unless otherwise noted.)

MAX

(Note 1)

VCM= 2.5V IN+ = IN- = 2.5V MAX921, MAX923

V- to (V+ – 1.3V) V+ = 2.5V to 11V 100Hz to 100kHz MAX921, MAX923

TA= +25°C, 100pF load

CONDITIONS

Continuous Power Dissipation (TA= +70°C)

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

8-Pin CERDIP (derate 8.00mW/°C above +70°C)........640mW

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

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

16-Pin CERDIP (derate 10.00mW/°C above +70°C)......800mW

Operating Temperature Ranges:

MAX92_C_ _ .......................................................0°C to +70°C

MAX92_E_ _.....................................................-40°C to +85°C

MAX92_MJ_ ..................................................-55°C to +125°C

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

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

MIN TYP MAX UNITS

2.5 11 V

MAX921, HYST = REF

MAX922

MAX923, HYST = REF

MAX924

TA= +25°C C/E temp. ranges M temp. range TA= +25°C C/E temp. ranges M temp. range TA= +25°C C/E temp. ranges M temp. range TA= +25°C C/E temp. ranges M temp. range

C/E temp. ranges M temp. range

Overdrive = 10mV Overdrive = 100mV

2.5 3.2

3.1 4.5

5.5 6.5

±0.01 ±5

±0.02 nA

0.1 1.0 mV/V

0.1 1.0 mV/V 20 µV

4 5

7.5

8.5 11

±10 mV

±40

µA

nAInput Leakage Current (IN-, IN+)

VV- V+ – 1.3

RMS

µsResponse Time

2 _______________________________________________________________________________________

Ultra Low-Power,

Single/Dual-Supply Comparators

ELECTRICAL CHARACTERISTICS: 5V OPERATION (continued)

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

PARAMETER

Output Low Voltage

REFERENCE (MAX921/MAX923/MAX924 ONLY)

Sink Current

Voltage Noise

Note 1: MAX924 comparators work below 2.5V, see

to T

MIN

, unless otherwise noted.)

MAX

CONDITIONS

MAX92_ MAX922/

MAX923 MAX921/

MAX924

100Hz to 100kHz 100 µV

C/E temp. ranges: I M temp. range: I

Low-Voltage Operation

= 17mA;

OUT

= 10mA

OUT

= 1.8mA;

OUT

= 1.2mA

OUT

= 1.8mA;

OUT

= 1.2mA

OUT

C temp. range E temp. range M temp. range TA= +25°C

M temp. range 4 TA= +25°C C/E temp. ranges 4 M temp. range

section for more details.

ELECTRICAL CHARACTERISTICS: 3V OPERATION

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

PARAMETER

POWER REQUIREMENTS

Supply Current

COMPARATOR

Input Offset Voltage

Input Leakage Current (HYST)

MIN

to T

, unless otherwise noted.)

MAX

CONDITIONS

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

VCM= 1.5V IN+ = IN- = 1.5V MAX921, MAX923

MAX921

MAX922

MAX923

MAX924

TA= +25°C C/E temp. ranges M temp. range TA= +25°C C/E temp. ranges M temp. range TA= +25°C C/E temp. ranges M temp. range TA= +25°C C/E temp. ranges M temp. range

C/E temp. ranges M temp. range

MIN TYP MAX UNITS

V+ – 0.4

V- + 0.4

GND + 0.4

1.170 1.182 1.194

1.158 1.206Reference Voltage

1.147 1.217 15 25

815

MIN TYP MAX UNITS

2.4 3.0

3.8

4.8

2.4 3.0

3.8

4.8

3.4 4.3

5.8

7.2

5.2 6.2

8.0

10.5

±10 mV

±0.01 ±5

±40

±0.02 nA

MAX921–MAX924

VOutput High Voltage

µAC/E temp. ranges 6Source Current

µA

RMS

µA

nAInput Leakage Current (IN-, IN+)

_______________________________________________________________________________________ 3

Ultra Low-Power, Single/Dual-Supply Comparators

ELECTRICAL CHARACTERISTICS: 3V OPERATION (continued)

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

MIN

to T

, unless otherwise noted.)

MAX

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Input Common-Mode Voltage Range VV- V+ – 1.3 Common-Mode Rejection Ratio 0.2 1 mV/V Power-Supply Rejection Ratio Voltage Noise Hysteresis Input Voltage Range REF- 0.05V REF V

MAX921–MAX924

Output Low Voltage

V- to (V+ – 1.3V) V+ = 2.5V to 11V 100Hz to 100kHz MAX921, MAX923

TA= +25°C, 100pF load

MAX92_ MAX922/

MAX923 MAX921/

MAX924

C/E temp. ranges: I M temp. range: I

Overdrive = 10mV Overdrive = 100mV

= 10mA;

OUT

= 6mA

OUT

= 0.8mA;

OUT

= 0.6mA

OUT

= 0.8mA;

OUT

= 0.6mA

OUT

0.1 1 mV/V 20 µV

V+ – 0.4

V- + 0.4

GND + 0.4

REFERENCE

Source Current

C temp. range E temp. range M temp. range TA= +25°C C/E temp. ranges 6

1.170 1.182 1.194

1.158 1.206Reference Voltage

1.147 1.217 15 25

M temp. range 4

Sink Current

Voltage Noise

TA= +25°C C/E temp. ranges 4 M temp. range

100Hz to 100kHz 100 µV

815

__________________________________________Typical Operating Characteristics

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

OUTPUT VOLTAGE LOW

vs. LOAD CURRENT

2.5

2.0

V+ = 3V

48 16

020

(V)

1.5

1.0

0.5

0.0

V+ = 5V

LOAD CURRENT (mA)

MAX921/4-TOC1

(V)

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

OUTPUT VOLTAGE HIGH vs.

V+ = 5V

010 30 50

LOAD CURRENT

MAX921/924-TOC2

V+ = 3V

20 40

LOAD CURRENT (mA)

REFERENCE OUTPUT VOLTAGE vs.

OUTPUT LOAD CURRENT

1.190

1.185

1.180

1.175

1.170

1.165

REFERENCE OUTPUT VOLTAGE (V)

1.160

1.155 0 5 15 25

SINK

V+ = 5V 

OR

V+ = 3V

10 20

OUTPUT LOAD CURRENT (µA)

SOURCE

RMS

µsResponse Time

VOutput High Voltage

µA

RMS

MAX921/924-TOC3

4 _______________________________________________________________________________________

Ultra Low-Power,

Single/Dual-Supply Comparators

__________________________________________Typical Operating Characteristics

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

REFERENCE VOLTAGE 

vs. TEMPERATURE

1.22

1.21

1.20

1.19

1.18

1.17

1.16

REFERENCE VOLTAGE (V)

1.15

1.14

MILITARY TEMP. RANGE

EXTENDED TEMP. RANGE

COMMERCIAL 

TEMP. RANGE

-60 -20 60 140

-40 0 8040 120

20 100

TEMPERATURE (°C)

MAX923

SUPPLY CURRENT vs. TEMPERATURE

5.0

4.5

4.0

3.5

3.0

SUPPLY CURRENT (µA)

2.5

2.0

V+ = 5V, V- = 0V

V+ = 3V, V- = 0V

-60 140

-20 20 100 TEMPERATURE (°C)



HYSTERESIS CONTROL

80 60

OUTPUT HIGH

40 20

IN+ – IN- (V)

-20

-40 OUTPUT LOW

-60

-80

010 30 50

NO CHANGE

20 40

-V

(mV)

REF

HYST

_______________________________________________________________________________________

4.5 IN+ = IN- + 100mV

4.0

MAX921/924-TOC4

V+ = 5V, V- = -5V

3.5

3.0

SUPPLY CURRENT (µA)

2.5

2.0

-60 140

SUPPLY CURRENT vs. TEMPERATURE

IN+ = (IN- + 100mV)

MAX921/924-TOC7

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

SUPPLY CURRENT (µA)

-60 140

5.0

4.5

4.0

MAX921/924 TOC10

3.5

3.0

2.5

2.0

1.5

OUTPUT VOLTAGE (V)

1.0

0.5 0

-0.3 -0.1 0.3

MAX921

SUPPLY CURRENT vs. 

TEMPERATURE

V+ = 3V, V- = 0V

V+ = 5V, V- = 0V

-20 20 100 TEMPERATURE (°C)

MAX924 

V+ = 5V, V- = 0V

V+ = 3V, V- = 0V

-20 20 100 TEMPERATURE (°C)



TRANSFER FUNCTION

100k

10µF

-0.2 0 IN+ INPUT VOLTAGE (mV)

0.1

SUPPLY CURRENT vs. TEMPERATURE

MAX922 

4.5 IN+ = (IN- + 100mV)

4.0

MAX921/924-TOC5

3.5

V+ = 10V, V- = 0V

3.0

2.5

SUPPLY CURRENT (µA)

2.0

1.5

-60 140

V+ = 3V, V- = 0V

-20 20 100 TEMPERATURE (°C)

V+ = 5V, V- = 0V

MAX924

SUPPLY CURRENT vs. 

LOW SUPPLY VOLTAGES

MAX921/924-TOC8

0.1

SUPPLY CURRENT (µA)

0.01

1.0 2.0 2.5

1.5

SINGLE-SUPPLY VOLTAGE (V)

RESPONSE TIME vs. LOAD CAPACITANCE

V- = 0V

MAX921/924-TOC11

14 12

RESPONSE TIME (µs)

6 4

0.2

0 20 60 100

OHL

OLH

40 80

LOAD CAPACITANCE (nF)

MAX921-MAX924

MAX921/924-TOC6

MAX921/924-TOC9

MAX921/924 TOC12

+ 11 hidden pages