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IMP707CPA Datasheet(PDF) 6 Page - IMP, Inc |
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IMP707CPA Datasheet(HTML) 6 Page - IMP, Inc |
6 / 9 page 6 408-432-9100/www.impweb.com © 1999 IMP, Inc. IMP705/6/7/8, 8 IMP705/6/7/8, 8113L 3L Application Information IMP70x VCC < 1.1V GND RESET 100k 9 705_06.eps VCC Ensuring That RESET is Valid Down to VCC = 0V When VCC falls below 1.1V, the IMP705-708 RESET output no longer pulls down; it becomes indeterminate. To avoid the possi- bility that stray charges build up and force RESET to the wrong state, a pull-down resistor should be connected to the RESET pin, thus draining such charges to ground and holding RESET low. The resistor value is not critical. A 100k Ω resistor will pull RESET to ground without loading it. Bi-directional Reset Pin Interfacing The IMP705/6/7/8 can interface with µP/µC bi-directional reset pins by connecting a 4.7k Ω resistor in series with the RESET output and the µP/µC bi-directional RESET pin. Power Supply IMP70x VCC GND GND RESET 4.7k Ω 705_08.eps Bi-directional I/O Pin (Example: 68HC11) BUF Buffered RESET µC or µP RESET Input Figure 3. Ensuring That RESET is Valid Down to VCC = 0V Figure 3. Bi-directional Reset Pin Interfacing |
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