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S-801 Datasheet(PDF) 14 Page - Seiko Instruments Inc |
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S-801 Datasheet(HTML) 14 Page - Seiko Instruments Inc |
14 / 33 page ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR WITH DELAY CIRCUIT (INTERNAL DELAY TIME SETTING) S-801 Series Rev.3.3_00 14 Seiko Instruments Inc. Operation 1. Basic Operation: CMOS Output (Active Low) 1-1. When the power supply voltage (VDD) is higher than the release voltage (+VDET), the Nch transistor is OFF and the Pch transistor is ON to provide VDD (high) at the output. Since the Nch transistor N1 in Figure 10 is OFF, the comparator input voltage is C B A DD C B R R R V ) R R ( + + • + . 1-2. When the VDD goes below +VDET, the output provides the VDD level, as long as VDD remains above the detection voltage (–VDET). When the VDD falls below –VDET (point A in Figure 11), the Nch transistor becomes ON, the Pch transistor becomes OFF, and the VSS level appears at the output. At this time the Nch transistor N1 in Figure 10 becomes ON, the comparator input voltage is changed to B A DD B R R V R + • . 1-3. When the VDD falls below the minimum operating voltage, the output becomes undefined, or goes to VDD when the output is pulled up to VDD. 1-4. The VSS level appears when VDD rises above the minimum operating voltage. The VSS level still appears even when VDD surpasses the –VDET, as long as it does not exceed the release voltage +V DET. 1-5. When VDD rises above +VDET (point B in Figure 11), the Nch transistor becomes OFF and the Pch transistor becomes ON to provide VDD at the output. The VDD at the OUT pin is delayed for tD due to the delay circuit. *1 DS *1 RC RB Pch Nch VREF VDD + − RA N1 VSS OUT Delay circuit *1. Paracitic diode Figure 10 Operation 1 |
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