Datasheet

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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 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–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

MAX971

MAX981

OUT

IN+

HYST

REF

V-

GND

V+

IN-

THRESHOLD DETECTOR

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

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.

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

Battery-Powered

Systems

Threshold Detectors

Window Comparators

Level Translators

Oscillator Circuits

Summary of content (17 pages)

PAGE 1
9-0450; Rev 3; 2/03 Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators 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.
PAGE 2
MAX971–MAX974/MAX981–MAX984 Ultra-Low-Power, Open-Drain, 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 OUT_ ................................................................
PAGE 3
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators (V+ = 5V, V- = GND = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Output Low Voltage Output Leakage Current CONDITIONS MIN TYP MAX UNITS MAX9_2/MAX9_3, IOUT = 1.8mA V- + 0.4 MAX9_1/MAX9_4, IOUT = 1.8mA GND + 0.
PAGE 4
MAX971–MAX974/MAX981–MAX984 Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators ELECTRICAL CHARACTERISTICS—3V OPERATION (continued) (V+ = 3V, V- = GND = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators REFERENCE OUTPUT VOLTAGE vs. OUTPUT LOAD CURRENT 1.0 0.5 1.180 SOURCE 1.175 1.170 1.165 V+ = 5V OR V+ = 3V 1.160 4 8 16 12 1.17 1.16 1.15 10 5 20 15 25 30 -60 -40 -20 0 20 40 60 80 100 120 140 MAX9_1 SUPPLY CURRENT vs. TEMPERATURE MAX972 SUPPLY CURRENT vs. TEMPERATURE MAX982/MAX9_3 SUPPLY CURRENT vs. TEMPERATURE 3.0 V+ = 3V, V- = 0V 4.0 3.5 V+ = 10V, V- = 0V 3.0 2.5 V+ = 5V, V- = 0V 5.0 4.5 2.0 V+ = 5V, V- = 0V 3.5 3.0 2.
PAGE 6
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators Typical Operating Characteristics (continued) (V+ = 5V, V- = GND = 0V, TA = +25°C, unless otherwise noted.) 3.0 2.5 2.0 1.5 1.0 14 VOHL 12 0 5 4 10mV 3 100mV 2 10 1 8 0 6 4 0.5 20mV 50mV 100 0 2 0.3 0 RESPONSE TIME AT LOW SUPPLY VOLTAGES (VOHL) 100 -20mV 10 40 60 80 100 -2 2 6 10 14 LOAD CAPACITANCE (nF) RESPONSE TIME (µs) MAX9_4 SINK CURRENT AT LOW SUPPLY VOLTAGES SHORT-CIRCUIT SINK CURRENT vs.
PAGE 7
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators PIN MAX971/ MAX981 MAX972 MAX982 MAX973/ MAX983 NAME FUNCTION DIP/SO/ µMAX DIP/SO/ µMAX UCSP DIP/SO/ µMAX DIP/SO/ µMAX 1 — — — — GND Ground. Connect to V- for single-supply operation. 2 2 C2 2 2 V- Negative Supply. Connect to GND for single-supply operation (MAX9_1). 3 — — — — IN+ Noninverting Comparator Input 4 — — — — IN- Inverting Comparator Input 5 — — 5 5 HYST 6 — — 6 6 REF Reference Output.
PAGE 8
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators MAX971–MAX974/MAX981–MAX984 Pin Description (continued) PIN MAX974 MAX984 8 NAME FUNCTION 1 OUTB Comparator B Open-Drain Output. Sinks current to GND. 2 OUTA Comparator A Open-Drain Output. Sinks current to GND. 3 V+ 4 INA- Inverting Input of Comparator A 5 INA+ Noninverting Input of Comparator A 6 INB- Inverting Input of Comparator B 7 INB+ Noninverting Input of Comparator B 8 REF Reference Output. 1.
PAGE 9
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators Power-Supply and Input Signal Ranges The MAX971–MAX974/MAX981–MAX984 comprise various combinations of a micropower 1.182V reference and micropower comparators. The Typical Operating Circuit shows the MAX971/MAX981 configuration, and Figures 1a–1d show the MAX9_2–MAX9_4 configurations. Internal hysteresis in the MAX9_1, MAX982, and MAX9_3 provides the easiest method for implementing hysteresis.
PAGE 10
MAX971–MAX974/MAX981–MAX984 Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators THRESHOLDS IN+ INVREF - VHYST HYSTERESIS VHB The negative supply does not affect the output sink current. The positive supply provides gate drive for the output N-channel MOSFET and heavily influences the output current capability, especially at low supply voltages (see Typical Operating Characteristics section). The MAX9_2 and MAX9_3 have no GND pin, and their outputs sink current to V-.
PAGE 11
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators V+ Hysteresis RH Hysteresis increases the comparators’ noise margin by increasing the upper threshold and decreasing the lower threshold (Figure 2). Hysteresis (MAX9_1/MAX982/MAX9_3) To add hysteresis to the MAX9_1, MAX982, or MAX9_3, connect resistor R1 between REF and HYST, and connect resistor R2 between HYST and V- (Figure 3). If no hysteresis is required, connect HYST to REF.
PAGE 12
MAX971–MAX974/MAX981–MAX984 Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators 2) Select R1. The leakage current into INB- is normally under 1nA, so the current through R1 should exceed 100nA for the thresholds to be accurate. R1 values up to about 10MΩ can be used, but values in the 100kΩ to 1MΩ range are usually easier to deal with. In this example, choose R1 = 294kΩ. VIN VOTH = 5.5V VUTH = 4.5V R3 1MΩ 3) Calculate R2 + R3. The overvoltage threshold should be 5.5V when V IN is rising.
PAGE 13
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators 3.3V 3 WALL ADAPTER V+ 9V DC 10kΩ STEP-DOWN REGULATOR 3.3V LOGIC SUPPLY Q1 5 INA+ VINA MAX974 MAX984 OUTA 2 4 INA- 1MΩ 10kΩ 7 V+ BATTERY (4 CELLS) 7 INB+ VINB OUTB 1 MAX973 MAX983 953kΩ 10kΩ 6 INB- 4 INB- 10kΩ OUTB 8 470kΩ VINC 11 INC+ LOW BATT OUTC 16 1 OUTA R1 110kΩ 10 INC- DC OK 10kΩ VIND 3 INA+ 13 IND+ OUTD 15 REF 6 20kΩ R2 47kΩ 12 INDREF HYST 5 V2 2.4MΩ GND 14 8 N.C. V9 -5V Figure 6.
PAGE 14
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators MAX971–MAX974/MAX981–MAX984 Pin Configurations TOP VIEW GND 1 V- 2 MAX971 MAX981 IN+ 3 IN- 4 8 OUT 7 V+ 6 REF INA+ 3 5 HYST INA- 4 OUTA 1 V- 2 DIP/SO/µMAX MAX972 8 OUTB 7 V+ 6 INB+ INA+ 3 5 INB- INB+ 4 OUTA 1 V- 2 MAX982 8 OUTB 7 V+ 6 REF 5 HYST DIP/SO/µMAX DIP/SO/µMAX TOP VIEW (BUMPS ON BOTTOM) A 1 2 3 OUTA V+ OUTB OUTA 1 V- 2 B INA- MAX972 INB- INA+ 3 MAX973 MAX983 INB- 4 C INA+ V-
PAGE 15
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators PART PART TEMP RANGE PIN-PACKAGE TEMP RANGE PIN-PACKAGE MAX971EPA -40°C to +85°C 8 Plastic Dip MAX981CSA MAX971ESA -40°C to +85°C 8 SO MAX981CUA 0°C to +70°C MAX972CPA 0°C to +70°C 8 Plastic Dip MAX981EPA -40°C to +85°C 8 Plastic Dip MAX972CSA 0°C to +70°C 8 SO MAX981ESA -40°C to +85°C 8 SO 8 µMAX MAX982CPA 0°C to +70°C 8 Plastic Dip 8 SO MAX972CUA 0°C to +70°C 0°C to +70°C 8 SO 8 µMAX MAX972EBL-T* -40°C to +85°C
PAGE 16
Package Information 4X S 8 8 E ÿ 0.50±0.1 H MIN 0.002 0.030 0.6±0.1 L 1 α 0.6±0.1 S BOTTOM VIEW D MAX 0.043 0.006 0.037 0.05 0.75 1.10 0.15 0.95 0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0∞ 6∞ 0.5250 BSC 0.010 0.014 0.005 0.007 0.116 0.120 0.0256 BSC 0.116 0.120 0.188 0.198 0.016 0.026 6∞ 0∞ 0.0207 BSC c D e E H 1 MILLIMETERS MAX MIN INCHES DIM A A1 A2 b 8LUMAXD.EPS (The package drawing(s) in this data sheet may not reflect the most current specifications.
PAGE 17
Ultra Low-Power, Open-Drain, Single/Dual-Supply Comparators 9LUCSP, 3x3.EPS PDIPN.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.