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MAX6700-MAX6710 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX6700-MAX6710 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 9 page VCC powers the MAX6700/MAX6710Q and is not a monitored voltage. IN2 powers all other options for the MAX6710 and is a monitored voltage. When any supply drops below its threshold, the reset output asserts low and remains low while either IN1 or IN2 is above 1.0V. Adjustable Thresholds The MAX6700/MAX6710 offer several monitor options with adjustable reset thresholds. The threshold voltage at each adjustable IN_ input is typically 0.62V. To monitor a voltage >0.62V, connect a resistor-divider network to the circuit as shown in Figure 5. VINTH = 0.62V x (R1 + R2) / R2 or, solved in terms of R1: R1 = R2 ((VINTH / 0.62V) - 1) Because the MAX6700/MAX6710 have a guaranteed input current of ±0.2µA (±0.4µA for IN1) on their adjustable inputs, resistor values up to 100k Ω can be used for R2 with <1% error. The MAX6700/MAX6710Q include an internal voltage clamp (1.5V typ) at each of the adjustable voltage inputs. An input voltage higher than 1.5V induces a higher input current. Unused Inputs Connect unused monitor inputs to a supply voltage greater in magnitude than their specified threshold volt- ages. For unused IN_ adjustable inputs, connect a 1M Ω series resistor between the unused input and IN2 (or VCC) to limit the bias current. Use IN2 for normal opera- tion (device power-supply pin). Do not connect unused monitor inputs to ground or allow them to float. Adding Manual Reset Capability (MAX6710) Figure 6 shows an application circuit adding manual reset to the MAX6710. Depressing the pushbutton switch short- circuits the analog input to ground and initiates a RESET pulse. The switch must be open for at least 140ms in order to deassert the RESET output. No external switch debounce is required. Use a small capacitor to improve noise immunity when using long leads from the pushbut- ton switch to the adjustable input. Power-Supply Bypassing and Grounding The MAX6700/MAX6710 are normally powered from the monitored IN2 or from the VCC supply input. All monitored inputs are immune to short supply transients. For higher immunity in noisy applications, connect a 0.1µF bypass capacitor from the IN2 input to ground. Add capacitance to IN1, IN3, and IN4 to increase their noise immunity. Low-Voltage, High-Accuracy, Triple/Quad Voltage µP Supervisory Circuits in SOT Package _______________________________________________________________________________________ 7 Figure 3. RESET Output Timing Diagram Figure 5. Setting the Auxiliary Monitor VTH_ 90% 10% IN_ VTH_ RESET tRP tRD VREF = 0.62V R2 R1 VINTH R1 = R2 ( - 1 ) VINTH 0.62V Figure 4. Interfacing to Different Logic-Supply Voltage IN2 GND IN2 = +3.3V +5V MAX6700 MAX6710 VCC GND RESET RESET 100k Ω |
Similar Part No. - MAX6700-MAX6710 |
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Similar Description - MAX6700-MAX6710 |
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