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UM821RAE Datasheet(PDF) 11 Page - Union Semiconductor, Inc. |
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UM821RAE Datasheet(HTML) 11 Page - Union Semiconductor, Inc. |
11 / 17 page ________________________________________________________________________ http://www.union-ic.com Rev.01 Jan.2015 11/17 UM807/821/822 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 UM821/822 reset outputs. If, for example, the UM821 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 UM821 RESET ______________ (or UM822 RESET) output and the μP reset I/O (Figure 5). Buffer the reset output to other system components. BUFFER VCC VCC UM821 RESET GND 4.7k VCC µP RESET GND Buffered RESET to Other System Components Figure 5. Interfacing to μPs with Bidirectional Reset I/O UM821 |
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