Figure 6-44 shows a MAX934 connected as a simple, four-stage level detector with LED readouts. The full-scale threshold (all LEDs on) is given by VIN=(R1 + R2)/R1 volts. The other thresholds are at 3/4 full-scale, 1/2 full-scale, and 1/4 full-scale. The output resistors limit the current into the LEDs. MAXIM NEW RELEASES DATA BOOK, 1995, P. 3-58.
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 powersupply 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.
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*Ultra-Low 4µA Max Quiescent Current Over Extended Temp. Range (MAX931)* Power Supplies: Single +2.5V to +11V Dual ±1.25V to ±5.5V* 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
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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 (TA = +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
Post a Buying Lead
Required Field 
