MAX921 Maxim Integrated Products, MAX921 Datasheet
MAX921
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MAX921 Summary of contents
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... 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. ...
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... Current, REF....................................................................20mA Current, OUT_ .................................................................50mA Voltage, REF ....................................(V+ + 0.3V) to (V- – 0.3V) Voltage, OUT_ (MAX921/924) .....(V+ + 0.3V) to (GND – 0.3V) Voltage OUT_ (MAX922/923)...........(V+ + 0.3V) to (V- – 0.3V) OUT_ Short-Circuit Duration (V+ ≤ 5.5V) ...............Continuous 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 ...
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... Output High Voltage MAX92_ MAX922/ MAX923 Output Low Voltage MAX921/ MAX924 X REFERENCE (MAX921/MAX923/MAX924 ONLY) Reference Voltage Source Current Sink Current Voltage Noise 100Hz to 100kHz Note 1: MAX924 comparators work below 2.5V, see Low-Voltage Operation section for more details. ELECTRICAL CHARACTERISTICS: 3V OPERATION ( GND = 0V, T ...
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... MAX PARAMETER Input Common-Mode Voltage Range Common-Mode Rejection Ratio V- to (V+ – 1.3V) Power-Supply Rejection Ratio V+ = 2.5V to 11V Voltage Noise 100Hz to 100kHz Hysteresis Input Voltage Range MAX921, MAX923 Response Time T A Output High Voltage MAX92_ MAX922/ MAX923 Output Low Voltage MAX921/ MAX924 ...
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... TEMPERATURE ( C) HYSTERESIS CONTROL 80 60 OUTPUT HIGH CHANGE -20 -40 OUTPUT LOW -60 - (mV) REF HYST _______________________________________________________________________________________ Ultra Low-Power, Single/Dual-Supply Comparators MAX921 SUPPLY CURRENT vs. TEMPERATURE 4.5 IN+ = IN- + 100mV 4 5V 3 2.0 -60 - 100 140 TEMPERATURE ( C) MAX924 SUPPLY CURRENT vs. TEMPERATURE 10 IN+ = (IN- + 100mV 5V -5V 6 ...
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... TOTAL SUPPLY VOLTAGE (V) FUNCTION Ground. Connect to V- for single-supply operation. Output swings from V+ to GND. Comparator A output. Sinks and sources current. Swings from V+ to V-. Negative supply. Connect to ground for single-supply operation (MAX921). Noninverting comparator input Noninverting input of comparator A Inverting comparator input ...
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... Single/Dual-Supply Comparators _______________________________________________Pin Descriptions (continued) PIN NAME MAX921 MAX922 MAX923 – INB- 5 – 5 HYST 6 – 6 REF – 6 – INB – – OUT – OUTB PIN NAME MAX924 1 OUTB Comparator B output. Sinks and sources current. Swings from V+ to GND. 2 OUTA Comparator A output. Sinks and sources current. Swings from V+ to GND. ...
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... It also produces faster hysteresis action and consumes much less current than circuits using external positive feedback. Power-Supply and Input Signal Ranges This family of devices operates from a single +2.5V to +11V power supply. The MAX921 and MAX924 have a MAX922 OUTA 1 2 ...
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... With 100mV of overdrive, propagation delay is typically 3µs. The Typical Operating Characteristics show the propagation delay for various overdrive levels. The MAX921 and MAX924 output swings from V+ to GND, so TTL compatibility is assured by using a +5V ±10% supply. The negative supply does not affect the output swing, and can range from 0V to -5V ± ...
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... Hysteresis (MAX922/MAX924) 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 MAX921 and MAX923, and the high 10 ______________________________________________________________________________________ feedback impedance slows hysteresis. The design procedure is as follows: 1. Choose R3. The leakage current of IN+ is under 1nA (up to +85° ...
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... With a 10mA load, it typically provides a voltage of (V BATT quiescent current. This circuit takes advantage of the four key features of the MAX921: 2.5µA supply current internal reference, hysteresis, and high current output. Using the component values shown, the three resistor voltage divider programs the maximum ± ...
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... R1 R1 294k Figure 6. Window Detector The high output source capability of the MAX921 series is useful for driving LEDs. An example of this is the simple four-stage level detector shown in Figure 7. The full-scale threshold (all LEDs on) is given by V (R1 + R2)/R1 volts. The other thresholds are at 3/4 full scale, 1/2 full scale, and 1/4 full scale ...
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+ MAX924 1.182V 8 REF INA+ 182k OUTA INA- 7 INB+ 250k OUTB 1 INB- 750mV 6 11 INC+ 250k OUTC 16 500mV 10 INC- 13 IND+ 250k ...
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... Ultra Low-Power, Single/Dual-Supply Comparators _________________Pin Configurations TOP VIEW 1 8 GND OUT MAX921 3 6 REF IN HYST IN- DIP/SO/ MAX 1 8 OUTA OUTB MAX922 3 6 INB+ INA INB- INA- DIP/SO/ MAX 1 8 OUTA OUTB MAX923 3 6 REF INA HYST INB- DIP/SO/ MAX OUTB OUTC ...
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... Topographies MAX921/MAX922/MAX923 0.059" (1.50mm) DIE PAD MAX921 MAX922 1 GND OUTA IN+ INA+ 5 IN- INA- 6 HYST INB- 7 REF INB OUT OUTB TRANSISTOR COUNT: 164 SUBSTRATE CONNECTED TO V+ ______________________________________________________________________________________ Ultra Low-Power, Single/Dual-Supply Comparators OUTA 0.075" (1.91mm INA- INA+ INB- MAX923 OUTA V- V- INA+ ...
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... 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 © 1995 Maxim Integrated Products ...