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19-0194; Rev 1; 2/97
Ultra Low-Power, Low-Cost
Comparators with 2% Reference
_______________General Description
The MAX931-MAX934 single, dual, and quad micropower,
low-voltage comparators plus an on-board 2% accurate
reference feature the lowest power consumption available.
These comparators draw less than 4µA supply current
over temperature (MAX931), and include an internal
1.182V ±2% voltage reference, programmable hysteresis,
and TTL/CMOS outputs that sink and source current.
Ideal for 3V or 5V single-supply applications, the
MAX931-MAX934 operate from a single +2.5V to +11V
supply (or a ±1.25V to ±5V dual supply), and each
comparator’s input voltage range extends from the
negative supply rail to within 1.3V of the positive supply.
The MAX931-MAX934’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 MAX931-MAX934 minimize
parasitic feedback, which makes them easier to use.
The single MAX931 and dual MAX932/MAX933 provide a
unique and simple method for adding hysteresis without
feedback and complicated equations, using the HYST pin
and two resistors.
For applications that require increased precision with
similar power requirements, see the MAX921-MAX924 data
sheet. These devices include a 1% precision reference.
INTERNAL COMPARATORS
INTERNAL
2%
PER
HYSTERESIS
REFERENCE
PACKAGE
PACK-
AGE
____________________________Features
o
Ultra-Low 4µA Max Quiescent Current
Over Extended Temp. Range (MAX931)
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 ±2% 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
o
Available in Space-Saving µMAX Package
MAX931-MAX934
______________Ordering Information
PART
MAX931CPA
MAX931CSA
MAX931CUA
MAX931EPA
MAX931ESA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 SO
8 µMAX
8 Plastic DIP
8 SO
PART
MAX931
Yes
1
Yes
8-Pin
DIP/SO/
µMAX
8-Pin
DIP/SO/
µMAX
8-Pin
DIP/SO/
µMAX
16-Pin
DIP/SO
Ordering Information continued on last page.
For similar devices guaranteed over the military temp. range, see
the MAX921-MAX924 data sheet. The MAX931, MAX933, and
MAX934 are pin-compatible with the 1% accurate MAX921,
MAX923, and MAX924, respectively. The MAX932 and
MAX922 are not pin-compatible.
MAX932
Yes
2
Yes
__________Typical Operating Circuit
V
IN
7
3 IN+
V+
OUT 8
4 IN-
MAX933
Yes
2
Yes
MAX934
Yes
4
No
________________________Applications
Battery-Powered Systems
Threshold Detectors
Window Comparators
Oscillator Circuits
Alarm Circuits
5 HYST
6 REF
V-
2
MAX931
GND
1
THRESHOLD DETECTOR
1
________________________________________________________________
Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Ultra Low-Power, Low-Cost
Comparators with 2% Reference
MAX931-MAX934
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_ (MAX931/934) .....(V+ + 0.3V) to (GND – 0.3V)
Voltage, OUT_ (MAX932/933)..........(V+ + 0.3V) to (V- – 0.3V)
OUT_ Short-Circuit Duration (V+
≤
5.5V) ...............Continuous
Continuous Power Dissipation (T
A
= +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
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:
MAX93_C_ _ .......................................................0°C to +70°C
MAX93_E_ _.....................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°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, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
POWER REQUIREMENTS
Supply Voltage Range
(Note 1)
MAX931,
HYST = REF
MAX932,
HYST = REF
Supply Current
IN+ = IN- + 100mV
MAX933,
HYST = REF
T
A
= +25°C
C/E temp. ranges
T
A
= +25°C
MAX934
C/E temp. ranges
COMPARATOR
Input Offset Voltage
Input Leakage Current (IN-, IN+)
Input Leakage Current (HYST)
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Voltage Noise
Hysteresis Input Voltage Range
Response Time
V
CM
= 2.5V
IN+ = IN- = 2.5V, C/E temp. ranges
MAX931, MAX932, MAX933
V-
V- to (V+ – 1.3V)
V+ = 2.5V to 11V
100Hz to 100kHz
MAX931, MAX932, MAX933
T
A
= +25°C, 100pF load
Overdrive = 10mV
Overdrive = 100mV
0.1
0.1
20
REF – 0.05
12
4
±0.01
±0.02
V+ – 1.3
1.0
1.0
REF
8.5
±10
±5
mV
nA
nA
V
mV/V
mV/V
µV
RMS
V
µs
5.5
3.1
4.5
6
6.5
T
A
= +25°C
C/E temp. ranges
T
A
= +25°C
C/E temp. ranges
3.1
2.5
2.5
11
3.2
4
4.5
6
µA
V
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Ultra Low-Power, Low-Cost
Comparators with 2% Reference
ELECTRICAL CHARACTERISTICS—5V Operation (continued)
(V+ = 5V, V- = GND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
Output High Voltage
CONDITIONS
C/E temp. ranges, I
OUT
= 17mA
MAX932,
MAX933
MAX931,
MAX934
MIN
V+ – 0.4
V- + 0.4
V
GND + 0.4
TYP
MAX
UNITS
V
MAX931-MAX934
Output Low Voltage
C/E temp. ranges,
I
OUT
= 1.8mA
REFERENCE
X
C temp. range
Reference Voltage
E temp. range
T
A
= +25°C
Source Current
C/E temp. ranges
T
A
= +25°C
Sink Current
C/E temp. ranges
Voltage Noise
100Hz to 100kHz
4
100
µV
RMS
6
8
15
µA
1.147
15
25
µA
1.217
1.158
1.182
1.206
V
Note 1:
MAX934 comparators work below 2.5V, see
Low-Voltage Operation
section for more details.
ELECTRICAL CHARACTERISTICS—3V Operation
(V+ = 3V, V- = GND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
POWER REQUIREMENTS
MAX931,
HYST = REF
CONDITIONS
MIN
TYP
MAX
UNITS
T
A
= +25°C
C/E temp. ranges
T
A
= +25°C
C/E temp. ranges
T
A
= +25°C
C/E temp. ranges
T
A
= +25°C
2.4
3.0
3.8
MAX932,
HYST = REF
3.4
4.3
5.8
µA
Supply Current
IN+ = (IN- + 100mV)
MAX933,
HYST = REF
3.4
4.3
5.8
5.2
6.2
8.0
MAX934
C/E temp. ranges
COMPARATOR
Input Offset Voltage
Input Leakage Current (IN-, IN+)
Input Leakage Current (HYST)
V
CM
= 1.5V
IN+ = IN- = 1.5V, C/E temp. ranges
MAX931, MAX932, MAX933
±0.01
±0.02
±10
±1
mV
nA
nA
_______________________________________________________________________________________
3
Ultra Low-Power, Low-Cost
Comparators with 2% Reference
MAX931-MAX934
ELECTRICAL CHARACTERISTICS—3V Operation (continued)
(V+ = 3V, V- = GND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Voltage Noise
Hysteresis Input Voltage Range
Response Time
Output High Voltage
V- to (V+ – 1.3V)
V+ = 2.5V to 11V
100Hz to 100kHz
MAX931, MAX932, MAX933
T
A
= +25°C, 100pF load
Overdrive = 10mV
Overdrive = 100mV
V+ – 0.4
MAX932,
MAX933
MAX931
REFERENCE
C temp. range
Reference Voltage
E temp. range
T
A
= +25°C
Source Current
C/E temp. ranges
T
A
= +25°C
Sink Current
C/E temp. ranges
Voltage Noise
100Hz to 100kHz
4
100
µV
RMS
6
8
15
µA
1.147
15
25
µA
1.217
1.158
1.182
1.206
V
V- + 0.4
V
GND + 0.4
REF – 0.05
14
5
CONDITIONS
MIN
V-
0.2
0.1
20
REF
TYP
MAX
V+ – 1.3
1
1
UNITS
V
mV/V
mV/V
µV
RMS
V
µs
V
C/E temp. ranges, I
OUT
= 10mA
Output Low Voltage
C/E temp. ranges, I
OUT
= 0.8mA
4
_______________________________________________________________________________________
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