Document
19-0450; Rev 3; 2/03
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators
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).
COMPARATORS PER PACKAGE INTERNAL HYSTERESIS INTERNAL PRECISION REFERENCE
Features
o Available in Ultra-Small Packages: UCSP™ (MAX972) µMAX (MAX9_1/MAX9_2/MAX9_3) o Ultra-Low Quiescent Current (4µA, max) Over Extended Temp Range (MAX971/MAX981) o Power Supplies: Single 2.5V to 11V Dual ±1.25V to ±5.5V o Input Voltage Range Includes Negative Supply o Internal Bandgap Reference 1.182V ±1% (MAX97_) 1.182V ±2% (MAX98_) o 12µs Propagation Delay (10mV Overdrive) o Output Has Separate GND Pin (MAX9_1/MAX9_4)
MAX971–MAX974/MAX981–MAX984
Applications
Battery-Powered Systems Threshold Detectors Window Comparators Level Translators Oscillator Circuits
Ordering Information
PART MAX971CPA MAX971CSA MAX971CUA TEMP RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C PIN-PACKAGE 8 Plastic Dip 8 SO 8 µMAX
PACKAGE
Ordering Information continued at end of data sheet.
PART
Typical Operating Circuit
VIN 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/µMAX 8-Pin UCSP/ DIP/SO/µMAX 8-Pin DIP/SO/µMAX 16-Pin DIP/SO 8-Pin DIP/SO/µMAX 8-Pin DIP/SO/µMAX 8-Pin DIP/SO/µMAX 16-Pin DIP/SO
5 HYST
6 REF V2
MAX971 MAX981
GND 1
THRESHOLD DETECTOR UCSP is a trademark of Maxim Integrated Products, Inc.
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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.
Free Datasheet http://www.datasheet4u.com/
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators MAX971–MAX974/MAX981–MAX984
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_ ................................................................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 (TA = +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
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.
ELECTRICAL CHARACTERISTICS—5V OPERATION
(V+ = 5V, V- = GND = 0V, TA = TMIN to TMAX, unles.