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IMP1834AEMA Datasheet(PDF) 6 Page - A1 PROs co., Ltd. |
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IMP1834AEMA Datasheet(HTML) 6 Page - A1 PROs co., Ltd. |
6 / 8 page IMP1 IMP183 83 4/A/D 4/A/D 6 408-432-9100/www.impweb.com © 1999 IMP, Inc. Reset Output Signal Reset output signals are valid as long as either voltage at 5VIN or 3.3VIN is above 1.2V. In addition, the IMP1834 has push-pull outputs that can remain valid below a 1.2V input level. To sink current below 1.2V, a resistor should be connected from the reset output to ground. This resistor guarantees a valid reset signal down to 0V. A 100k Ω value is suggested. The IMP1834A open drain reset outputs require pull-up resistors and must be low enough in value to pull the output into a HIGH state. Resistor value is not critical in most applications and a value of 10k Ω is suggested. See Figure 5 and Figure 6. The IMP1834A open drain reset outputs can be connected to the same potential through a single pull up resistor. In this configura- tion a failure on either supply will generate an active LOW reset. If the outputs are pulled-up to different voltages, the reset outputs (pin 2 and pin 7) should not be connected. See Figure 7. Figure 5. IMP1834 RESET Valid to 0V RESET 100k Ω 1834_06.eps µP Input Figure 6. IMP1834A Open Drain Output Pull-Up Resistor 1834_07.eps 5VIN 10k Ω 3.3V 1 3.3VIN 5VRESET 2 3.3VRESET 5VTOL IMP1834A 3 4 3.3VTOL GND 8 7 6 5 PBRST 5V 10k Ω Figure 7. IMP1834A Wired “OR” Connection 1834_08.eps 5VIN 3.3V 1 3.3VIN 5VRESET 2 3.3VRESET 5VTOL IMP1834A 3 4 3.3VTOL GND 8 7 6 5 PBRST 5V or 3.3V 5V 10k Ω Application Information |
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