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UM7044A Datasheet(PDF) 4 Page - Union Semiconductor, Inc. |
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UM7044A Datasheet(HTML) 4 Page - Union Semiconductor, Inc. |
4 / 8 page ________________________________________________________________________ http://www.union-ic.com Rev.04 Jul.2012 4/8 UM70xxA Function Description The UM70xxA series are a set of voltage detectors equipped with a high stability voltage reference which is connected to the negative input of a comparator-denoted as VREF in the following figure for NMOS output voltage detector. When the voltage drop to the positive input of the comparator (i,e,VB) is higher than VREF, VOUT goes high, and VB is expressed as VBH=VDD RB / (RA+RB). If VDD is decreased so that VB falls to a value less than VREF, the comparator output inverts from high to low, VOUT goes low, VC is high. If VDD falls below the minimum operating voltage, the output becomes undefined. The figure demonstrates the NMOS output type with positive output polarity (VOUT is normally open, active low). The UM70xxA series also supplies options for other output types with active high outputs. Application circuits shown are examples of positive output polarity (normally open, active low) unless otherwise specified NMOS Output Voltage Detector (UM70xxA) |
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