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AN2504 数据表(PDF) 5 Page - STMicroelectronics |
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AN2504 数据表(HTML) 5 Page - STMicroelectronics |
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5 / 14 page  AN2504 - Application note Operation 5/14 3 Operation The voltage detector monitors VCC voltage input continuously (see Figure 1) and compares it with the precision voltage reference, VREF. When VCC falls below a specified trip point threshold, the output (OUT) is forced low and remains asserted as long as the VCC input remains below VTH+, where VTH+ = VTH– + VHYST (hysteresis) see Figure 3. Remember that a pull-up resistor on the voltage detector open-drain output is required for proper functionality (see Figure 2). Figure 3. Voltage timing waveform AI10483 VCC VCC (min) VSS VTH+ VTH– tPR Release Delay tPD Detect Delay Release Voltage (VTH+ = VTH– + VHYST) Detect Voltage VSS VOUT |
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