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IMP809MEUR-T Datasheet(PDF) 5 Page - IMP, Inc |
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IMP809MEUR-T Datasheet(HTML) 5 Page - IMP, Inc |
5 / 7 page 5 IMP809, IMP8 IMP809, IMP81100 Bi-directional Reset Pin Interfacing The IMP809/810 can interface with µP/µC bi-directional reset pins by connecting a 4.7k Ω resistor in series with the IMP809/810 reset output and the µP/µC bi-directional reset pin. Negative VCC Transients The IMP809/810 protect µPs from brownouts and low VCC. Short duration transients of 100mV amplitude and 20µs or less duration typically do not cause a false RESET. To ensure logic inputs connected to the IMP809 RESET pin are in a known state when VCC is under 1.1V, a 100kΩ pull-down resistor at RESET is needed. The value is not critical. A pull-up resistor to VCC is needed with the IMP810. Power Supply IMP810 VCC GND RESET 100k Ω 809/10_05.eps Valid Reset with VCC under 1.1V Power Supply IMP809 VCC GND RESET 100k Ω 809/10_04.eps Power Supply IMP809 VCC GND GND RESET 4.7k Ω 809/10_06.eps Bi-directional I/O Pin (Example: 68HC11) BUF Buffered RESET µC or µP RESET Input Application Information Figure 2. RESET Valid with VCC Under 1.1V Figure 3. RESET Valid with VCC Under 1.1V Figure 4. Bi-directional Reset Pin Interfacing |
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