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## MAX990ESA Datasheet(PDF) 8 Page - Maxim Integrated Products

 Part # MAX990ESA Description Micropower, Low-Voltage, UCSP/SC70, Rail-to-Rail I/O Comparators Download 13 Pages Scroll/Zoom 100% Manufacturer MAXIM [Maxim Integrated Products] Direct Link https://www.maximintegrated.com/en.html Logo

## MAX990ESA Datasheet(HTML) 8 Page - Maxim Integrated Products

 8 / 13 pageMicropower, Low-Voltage, UCSP/SC70,Rail-to-Rail I/O Comparators8_______________________________________________________________________________________5) Calculate R2 as follows. For this example, choose an8.2kΩ standard value:6) Verify trip voltages and hysteresis as follows:MAX986/MAX990/MAX994The MAX986/MAX990/MAX994 have ±3mV internalhysteresis. They have open-drain outputs and requirean external pullup resistor (Figure 2). Additional hys-teresis can be generated using positive feedback, butthe formulas differ slightly from those of theMAX985/MAX989/MAX993.Use the following procedure to calculate resistorvalues:1) Select R3 according to the formulas R3 = VREF /500µA or R3 = (VREF - VCC) / 500µA - R4. Use thesmaller of the two resulting resistor values.2) Choose the hysteresis band required (VHB). For thisexample, choose 50mV.3) Calculate R1 according to the following equation:R1 = (R3 + R4) x (VHB / VCC)4) Choose the trip point for VIN rising (VTHR; VTHF isthe trip point for VIN falling). This is the thresholdvoltage at which the comparator switches its outputfrom low to high as VIN rises above the trip point.5) Calculate R2 as follows:6) Verify trip voltages and hysteresis as follows:Board Layout and BypassingPower-supply bypass capacitors are not typically need-ed, but use 100nF bypass capacitors when supplyimpedance is high, when supply leads are long,or when excessive noise is expected on the supplylines. Minimize signal trace lengths to reduce straycapacitance.Vrising: V= Vx R1 x1R1VfallingINTHRREFIN:+++⎛⎝⎜⎞⎠⎟=−+⎛⎝⎜⎞⎠⎟=−12134134RRRVVRx VRRHysteresisVVTHFTHRCCTHRTHFR2 =1VVTHRREF xRRRR111134⎛⎝⎜⎞⎠⎟ −−+Vrising: V= Vx R1 x1R1VfallingINTHRREFIN:++⎛⎝⎜⎞⎠⎟=−⎛⎝⎜⎞⎠⎟=−121313RRVVRx VRHysteresisVVTHFTHRCCTHRTHFR2 =1VVR2 =13.0V1.2 x 12kTHRREF..xRRRkMk11113112122803⎛⎝⎜⎞⎠⎟ −−⎛⎝⎜⎞⎠⎟ −−=ΩΩΩΩVEEVCCOUTR3R2R1R4VREFVINVCCMAX986MAX990MAX994Figure 2. Additional Hysteresis (MAX986/MAX990/MAX994)

## Similar Part No. - MAX990ESA

 Manufacturer Part # Datasheet Description Maxim Integrated Produc... MAX990ESA 453Kb / 13P Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators Rev 3; 9/02 MAX990ESA++ 309Kb / 12P Micropower, Low-Voltage, UCSP/SC70, Rail-to-Rail I/O Comparators Rev 5; 4/12
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## Similar Description - MAX990ESA

 Manufacturer Part # Datasheet Description Maxim Integrated Produc... MAX985 369Kb / 12P Micropower, Low-Voltage, UCSP/SC70, Rail-to-Rail I/O Comparators Rev 6; 8/12 MAX985_V5 309Kb / 12P Micropower, Low-Voltage, UCSP/SC70, Rail-to-Rail I/O Comparators Rev 5; 4/12 MAX985 453Kb / 13P Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators Rev 3; 9/02 MAX987 329Kb / 13P High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators Rev 2; 1/07 MAX987 141Kb / 12P High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators Rev 0b; 7/97 STMicroelectronics TS334IDT 1Mb / 27P Micropower low-voltage, rail-to-rail comparators Maxim Integrated Produc... MAX965 116Kb / 12P Single/Dual/Quad, Micropower, Ultra-Low-Voltage, Rail-to-Rail I/O Comparators Rev 0; 4/97 MAX4162 329Kb / 13P UCSP, Micropower, Single-Supply, 10V, Rail-to-Rail I/O Op Amps Rev 3; 1/10 MAX4162 304Kb / 14P UCSP, Micropower, Single-Supply, 10V, Rail-to-Rail I/O Op Amps Rev 2; 5/09 MAX4162 2Mb / 13P UCSP, Micropower, Single-Supply, 10V, Rail-to-Rail I/O Op Amps 2019
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