MAX921 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Ultra Low-Power, Single/Dual-Supply Comparators

19-0115; Rev 3; 3/95
Ultra Low-Power,
Single/Dual-Supply Comparators
_______________General Description
The MAX921–MAX924 single, dual, and quad micro-
power, 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 con-
tinuously sources as much as 40mA. And by eliminating
power-supply glitches that commonly occur when com-
parators 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.
MAX921 Yes
MAX922
No
MAX923 Yes
MAX924 Yes
1
Yes
8-Pin
DIP/SO/µMAX
2
No
8-Pin
DIP/SO/µMAX
2
Yes
8-Pin
DIP/SO/µMAX
4
No
16-Pin
DIP/SO/µMAX
________________________Applications
Battery-Powered Systems
Threshold Detectors
Window Comparators
Oscillator Circuits
____________________________Features
o µMAX Package—Smallest 8-Pin SO
(MAX921/MAX922/MAX923)
o Ultra-Low 4µA Max Quiescent Current
Over Extended Temp. Range (MAX921)
o Power Supplies:
Single +2.5V to +11V
Dual ±1.25V to ±5.5V
o Input Voltage Range Includes Negative Supply
o Internal 1.182V ±1% Bandgap Reference
o Adjustable Hysteresis
o TTL/CMOS-Compatible Outputs
o 12µs Propagation Delay (10mV Overdrive)
o No Switching Crowbar Current
o 40mA Continuous Source Current
______________Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX921CPA
0°C to +70°C
8 Plastic DIP
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_A = +25°C, DC parameters only.
** Contact factory for availability and processing to MIL-STD-883.
__________Typical Operating Circuit
VIN
7
V+
3 IN+
4 IN-
OUT 8
5 HYST
6 REF
V-
2
MAX921
GND
1
THRESHOLD DETECTOR
________________________________________________________________ Maxim Integrated Products 1
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