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/.