MAX934 Maxim, MAX934 Datasheet

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MAX934

Manufacturer Part Number
MAX934
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
Manufacturer
Maxim
Datasheet

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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.
________________________Applications
19-0194; Rev 1; 2/97
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX931
MAX932
MAX933
MAX934
_______________General Description
PART
Battery-Powered Systems
Threshold Detectors
Window Comparators
Oscillator Circuits
Alarm Circuits
REFERENCE
INTERNAL
Yes
Yes
Yes
Yes
2%
________________________________________________________________ Maxim Integrated Products
COMPARATORS
PACKAGE
PER
1
2
2
4
HYSTERESIS
INTERNAL
Comparators with 2% Reference
Yes
Yes
Yes
No
8-Pin
DIP/SO/
µMAX
8-Pin
DIP/SO/
µMAX
8-Pin
DIP/SO/
µMAX
16-Pin
DIP/SO
PACK-
AGE
Ultra Low-Power, Low-Cost
____________________________Features
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.
__________Typical Operating Circuit
______________Ordering Information
MAX931CPA
MAX931CSA
MAX931CUA
MAX931EPA
MAX931ESA
Ultra-Low 4µA Max Quiescent Current
Over Extended Temp. Range (MAX931)
Power Supplies:
Input Voltage Range Includes Negative Supply
Internal 1.182V ±2% Bandgap Reference
Adjustable Hysteresis
TTL-/CMOS-Compatible Outputs
12µs Propagation Delay (10mV Overdrive)
No Switching Crowbar Current
40mA Continuous Source Current
Available in Space-Saving µMAX Package
PART
Single +2.5V to +11V
Dual ±1.25V to ±5.5V
V
IN
THRESHOLD DETECTOR
-40°C to +85°C
-40°C to +85°C
3
4
5
6
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
IN+
IN-
HYST
REF
2
V-
MAX931
V+
7
GND
1
8 Plastic DIP
8 SO
8 µMAX
8 Plastic DIP
8 SO
OUT
PIN-PACKAGE
8
1

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MAX934 Summary of contents

Page 1

... HYSTERESIS AGE For similar devices guaranteed over the military temp. range, see the MAX921-MAX924 data sheet. The MAX931, MAX933, and 8-Pin MAX934 are pin-compatible with the 1% accurate MAX921, Yes DIP/SO/ MAX923, and MAX924, respectively. The MAX932 and µMAX MAX922 are not pin-compatible. ...

Page 2

... MAX932, HYST = REF C/E temp. ranges IN+ = IN- + 100mV T = +25°C A MAX933, HYST = REF C/E temp. ranges T = +25°C A MAX934 C/E temp. ranges V = 2.5V CM IN+ = IN- = 2.5V, C/E temp. ranges MAX931, MAX932, MAX933 V- to (V+ – 1.3V 2.5V to 11V 100Hz to 100kHz MAX931, MAX932, MAX933 Overdrive = 10mV T = +25°C, 100pF load ...

Page 3

... PARAMETER Output High Voltage Output Low Voltage X REFERENCE Reference Voltage Source Current Sink Current Voltage Noise Note 1: MAX934 comparators work below 2.5V, see Low-Voltage Operation section for more details. ELECTRICAL CHARACTERISTICS—3V Operation ( GND = 0V MIN PARAMETER POWER REQUIREMENTS ...

Page 4

Ultra Low-Power, Low-Cost Comparators with 2% Reference ELECTRICAL CHARACTERISTICS—3V Operation (continued) ( GND = 0V MIN PARAMETER Input Common-Mode Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Voltage Noise Hysteresis ...

Page 5

... 1.160 1.155 OUTPUT LOAD CURRENT ( A) MAX932 SUPPLY CURRENT vs. TEMPERATURE 5.0 IN+ = IN- +100mV 4 3.5 3 2.0 140 -60 - 100 TEMPERATURE ( C) MAX934 SUPPLY CURRENT vs. LOW SUPPLY VOLTAGES 10 IN+ = IN- +100mV 1 0.1 0.01 140 1.0 1.5 2.0 SINGLE-SUPPLY VOLTAGE ( 140 2.5 5 ...

Page 6

... RESPONSE TIME vs. LOAD CAPACITANCE OHL OLH 0 LOAD CAPACITANCE (nF) MAX934 RESPONSE TIME AT LOW SUPPLY VOLTAGES 10 1 20mV OVERDRIVE 0.1 100mV OVERDRIVE 0.01 18 1.0 1.5 2.0 SINGLE-SUPPLY VOLTAGE (V) SHORT-CIRCUIT SINK CURRENT vs. SUPPLY VOLTAGE OUT CONNECTED TO V+ GND CONNECTED 5.0 ...

Page 7

... PIN NAME MAX934 1 OUTB 2 OUTA INA- 5 INA+ 6 INB- 7 INB+ 8 REF INC- 11 INC+ 12 IND- 13 IND+ 14 GND 15 OUTD 16 OUTC _______________________________________________________________________________________ Ultra Low-Power, Low-Cost ...

Page 8

... Connect V- to GND when operating the MAX931 and the MAX934 from a single supply. The maximum supply voltage in this case is still 11V. For proper comparator operation, the input signal can be driven from the negative supply (V-) to within one volt of the positive supply (V+ - 1V) ...

Page 9

... The reference will not function below about 2.2V, although the comparators will continue to operate with a total supply voltage as low as 1V. While the MAX934 has comparators that may be used at supply voltages below 2V, the MAX931, MAX932, and MAX933 may not be used with supply voltages significantly below 2.5V. At low supply voltages, the comparators’ ...

Page 10

... HB When hysteresis is obtained in this manner for the MAX932/MAX933, the same hysteresis applies to both comparators. Hysteresis (MAX934) Hysteresis can be set with two resistors using positive feedback, as shown in Figure 4. This circuit generally draws more current than the circuits using the HYST pin on the MAX931/MAX932/MAX933, and the high feedback impedance slows hysteresis ...

Page 11

... IN- voltage at 100mV. This gives an IN+ trip threshold of approximately 50mV for IN+ falling. The RC time constant determines the maximum power- on time of the OUT pin before power-down occurs. This period can be approximated by 4.6sec 4 ...

Page 12

... R3) R1 250k 500mV R2 R3) (R1 + R2) 250k 250mV REF R4 250k Figure 7. Bar-Graph Level Gauge Level Shifter Two-Stage Low-Voltage Detector is higher than the + MAX934 8 REF INA+ 2 OUTA 1V 4 INA- 330 7 INB+ 1 OUTB 6 INB- 330 11 INC+ 16 OUTC 10 INC- 330 ...

Page 13

... V+ MAX934 10k INA+ V INA INA- 10k INB+ V INB INB- 10k INC+ V INC INC- 10k IND+ V IND OUTD IND- V- GND -5V Figure 8. Level Shifter: ±5V Input to CMOS Output ______________________________________________________________________________________ Ultra Low-Power, Low-Cost Comparators with 2% Reference 0 FOR V < 0V INA 1 FOR V > 0V OUTA INB ...

Page 14

... REF MAX934ESE HYST 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. OUTB V+ REF ...

Page 15

Information ______________________________________________________________________________________ Ultra Low-Power, Low-Cost Comparators with 2% Reference 15 ...

Page 16

... Comparators with 2% Reference __________________________________________Package Information (continued) 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. 16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © ...

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