MAX933 Maxim, MAX933 Datasheet

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MAX933

Manufacturer Part Number
MAX933
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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MAX933 Summary of contents

Page 1

... 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 ...

Page 2

... 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 A Overdrive = 100mV = +70°C) A MIN TYP MAX UNITS 2 2.5 3 ...

Page 3

... A MAX932, HYST = REF C/E temp. ranges IN+ = (IN- + 100mV +25°C A MAX933, HYST = REF C/E temp. ranges T = +25°C A MAX934 C/E temp. ranges V = 1.5V CM IN+ = IN- = 1.5V, C/E temp. ranges MAX931, MAX932, MAX933 MIN TYP MAX UNITS V+ – 0 0.4 V GND + 0.4 1.158 1.182 1.206 V 1.147 1.217 15 25 µ µ ...

Page 4

... REFERENCE Reference Voltage Source Current Sink Current Voltage Noise 4 _______________________________________________________________________________________ , unless otherwise noted.) MAX CONDITIONS V- to (V+ – 1.3V 2.5V to 11V 100Hz to 100kHz MAX931, MAX932, MAX933 Overdrive = 10mV T = +25°C, 100pF load A Overdrive = 100mV C/E temp. ranges 10mA OUT MAX932, MAX933 C/E temp. ranges 0.8mA ...

Page 5

... TEMPERATURE 1.22 1.21 EXTENDED TEMP. RANGE 1.20 COMMERCIAL 1.19 TEMP. RANGE 1.18 1.17 1.16 1.15 1.14 -60 -40 - 100 120 TEMPERATURE ( C) MAX933 SUPPLY CURRENT vs. TEMPERATURE 5.0 IN+ = IN- +100mV 4 3.5 3 2.0 -60 - 100 TEMPERATURE ( C) _______________________________________________________________________________________ Ultra Low-Power, Low-Cost Comparators with 2% Reference OUTPUT VOLTAGE HIGH vs. LOAD CURRENT 5 ...

Page 6

Ultra Low-Power, Low-Cost Comparators with 2% Reference ____________________________Typical Operating Characteristics (continued) ( GND +25°C, unless otherwise noted.) A HYSTERESIS CONTROL 80 60 OUTPUT HIGH CHANGE -20 -40 OUTPUT LOW -60 ...

Page 7

... Descriptions PIN MAX931 MAX932 MAX933 1 – – – – – – – – – 4 – – – – – – PIN NAME MAX934 1 OUTB 2 OUTA INA- 5 INA+ 6 INB- 7 INB+ ...

Page 8

... Operating the MAX931 and MAX934 at ±5V provides TTL/CMOS compatibility when monitoring bipolar input signals. TTL compatibility for the MAX932 and MAX933 is achieved by operation from a single +5V supply. The guaranteed minimum operating voltage is 2.5V (or ±1.25V). As the total supply voltage is reduced below 2 ...

Page 9

... The negative supply does not affect the output swing, and can range from 0V to -5V ±10%. The MAX932 and MAX933 do not have a GND pin, and their outputs swing from V+ to V-. Connect V- to ground and +5V supply to achieve TTL compatibility. ...

Page 10

... (mV) 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

... For example: 2MΩ x 10µF x 4.6 = 92sec. The actual time will vary with both the leakage current of the capacitor and the voltage applied to the circuit. The MAX933 is ideal for making window detectors (undervoltage/overvoltage detectors). The schematic is shown in Figure 6, with component values selected for an 4 ...

Page 12

Ultra Low-Power, Low-Cost Comparators with 2% Reference 100nA for the thresholds to be accurate. R1 values up to about 10MΩ can be used, but values in the 100kΩ to 1MΩ range are usually easier to deal with. In this example, ...

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 ...

Page 14

... MAX934EPE 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 ...

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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