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MAX6709LUB Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX6709LUB Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 13 page as an adjustable voltage monitor, general-purpose comparator, or digital-level translator. The MAX6714 quad voltage monitor/reset offers one fixed input with internal timing for µP reset, three power- fail comparators, and a manual reset input (MR). RESET asserts low when VCC drops below its threshold or MR is driven low. Each of the three power-fail inputs connects directly to one of the comparator inputs. When any input is higher than the threshold level, the output is high. The output goes low as the input drops below the threshold voltage. The undervoltage lockout circuitry remains active and all outputs remain low with VCC down to 1V (Figures 1 and 2). Applications Information Hysteresis When the voltage on one comparator input is at or near the voltage on another input, ambient noise generally causes the comparator output to oscillate. The most common way to eliminate this problem is through hys- teresis. When the two comparator input voltages are equal, hysteresis causes one comparator input voltage to move quickly past the other, thus taking the input out of the region where oscillation occurs. Standard com- parators require hysteresis to be added through the use of external resistors. The external resistive network usually provides a positive feedback to the input in order to cause a jump in the threshold voltage when output toggles in one direction or the other. These Low-Voltage, High-Accuracy, Quad Voltage Monitors in µMAX Package 8 _______________________________________________________________________________________ UNDERVOLTAGE LOCKOUT TIMEOUT (200ms) 0.62V REFERENCE PFO2 PFI3 (ADJ) PFI2 (ADJ) PFI1 (ADJ) VCC (5.0V/3.3V) VCC MAX6714 VCC VCC VCC VCC PFO3 PFO1 RESET MR Figure 2. MAX6714 Functional Diagram |
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