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UM811ZE Datasheet(PDF) 10 Page - Union Semiconductor, Inc. |
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UM811ZE Datasheet(HTML) 10 Page - Union Semiconductor, Inc. |
10 / 14 page ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2015 10/14 UM805/811/812 Figure 4. RESET ____________ Valid to VCC = Ground Circuit Interfacing to μPs with Bidirectional Reset Pins μPs with bidirectional reset pins (such as the Motorola68HC11 series) can contend with the UM811/812 reset outputs. If, for example, the UM811 RESET ______________ output is asserted high and the μP wants to pull it low, indeterminate logic levels may result. To correct such cases, connect a 4.7kΩ resistor between the UM811 RESET ______________ (or UM812 RESET) output and the μP reset I/O (Figure 5). Buffer the reset output to other system components. BUFFER VCC VCC UM811 RESET GND 4.7k VCC µP RESET GND Buffered RESET to Other System Components Figure 5. Interfacing to μPs with Bidirectional Reset I/O |
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