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UM810VS Datasheet(PDF) 7 Page - Union Semiconductor, Inc. |
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UM810VS Datasheet(HTML) 7 Page - Union Semiconductor, Inc. |
7 / 14 page ________________________________________________________________________ http://www.union-ic.com Rev.06 Apr.2015 7/14 UM809/810 enough not to load RESET _____________ and small enough to pull RESET _____________ to ground. A 100kΩ pull-up resistor to VCC is also recommended for the UM810 if RESET is required to remain valid for VCC < 1V. Figure 10. RESET _____________ Valid to VCC=Ground Circuit Interfacing to μPs with Bidirectional Reset Pins Some µP’s (such as Motorola 68HC11) have bi-directional reset pins. Depending on the current drive capability of the processor pin, an indeterminate logic level may result in series with the output of the UM809 (Figure 11). If there are other components in the system which requires a reset signal, they should be buffered so as not to load the reset line. If the other components are required to follow the reset I/O of the μP, the buffer should be connected as shown with the solid line. ( )* for UM810 Figure 11. Interfacing to Bidirectional Reset I/O Benefits of Highly Accurate Reset Threshold Most µP supervisor circuits have reset threshold voltages between 5% and 10% below the value of nominal supply voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. When using ICs rated at only the nominal supply ±5%, this leaves a zone of uncertainty where the supply is between 5% and 10% low, and where the reset may or may not be asserted. The UM8_ L/T/Z use highly accurate circuitry to ensure that reset is asserted close to the 5% limit, and long before the supply has declined to 10% below nominal. |
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