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DS1831S Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS1831S Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 14 page DS1831/A/B 8 of 14 The output associated with the specific input will be held low if the voltage on the input pin is less than 1.25V. If the voltage is above 1.25V the output will not sink current and will be pulled up by the required pull up resistor. The value of the resistors is not critical in most cases but must be set low enough to pull the output to a high state. A common value used is 10k W. If a NMI output is connected to a pushbutton input an additional pull-up resistor can be used (to improve speed of transitions) but is not required. During a power-up, any detected IN pin levels above VTP by the comparator are disabled from generating an inactive (high) interrupt until at least 1 supply on the VIN inputs rises above 1.5 volts. All NMI outputs will be held active (low) until at least one VIN reaches 1.5 volts at which point the NMI outputs will be based on the value of the associated IN input. TIMING DIAGRAM—NON-MASKABLE INTERRUPT Figure 8 VIN >1.25V VTP VTP(min) VTP(max) tIPD NMI VOL VTP VTP(min) VTP(max) VOH tNMI |
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