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CAT810 Datasheet(PDF) 8 Page - Catalyst Semiconductor |
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CAT810 Datasheet(HTML) 8 Page - Catalyst Semiconductor |
8 / 13 page 8 CAT809, CAT810 Doc. No. 3004, Rev. S Patent Pending VALID RESET WITH VCC UNDER 1.0 V To ensure that the CAT809 RESET pin is in a known state when VCC is under 1.0 V, a 100 k Ω pull-down resistor between RESET pin and GND is recommended; the value is not critical. For the CAT810, a pull-up resistor from RESET pin to VCC is needed. BI-DIRECTIONAL RESET PIN INTERFACING The CAT809/810 can interface with µP/µC bi-directional reset pins by connecting a 4.7 kΩ resistor in series with the CAT809/810 reset output and the µP/µC bi-directional reset pin. CAT809 GND VCC 100k Ω Power Supply RESET CAT810 GND VCC 100k Ω Power Supply RESET FIGURE 3. RESET RESET RESET RESET RESET Valid with VCC Under 1.0 V FIGURE 4. RESET Valid with VCC Under 1.1 V FIGURE 5. Bi-directional Reset Pin Interfacing CAT809 GND VCC 4.7k Ω Power Supply RESET Buffered RESET BUF RESET INPUT GND Bi-directional I/O Pin µP (For example: 68HC11) |
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