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CAT803STBI-GT3 Datasheet(PDF) 7 Page - ON Semiconductor |
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CAT803STBI-GT3 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 11 page CAT803, CAT809, CAT810 http://onsemi.com 7 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 >10 kW pull−down resistor between RESET pin and GND is recommended. For the CAT810, a pull−up resistor from RESET pin to VCC is needed. Figure 8. RESET Valid with VCC Under 1.0 V Figure 9. RESET Valid with VCC Under 1.1 V CAT809 GND Power 10 kW Supply CAT810 GND Power Supply RESET VCC RESET 10 kW VCC Bi−directional Reset Pin Interfacing The CAT809/810 can interface with mP/mC bi−directional reset pins by connecting a 4.7 kW resistor in series with the CAT809/810 reset output and the mP/mC bi−directional reset pin. Figure 10. Bi−directional Reset Pin Interfacing CAT809 GND Power Supply BUF Buffered RESET GND Bi−directional I/O Pin mP (For example: 68HC11) VCC VCC 4.7 kW RESET RESET INPUT CAT803 Open−Drain RESET Application The CAT803 features an open−drain RESET output and therefore needs a pull−up resistor on the output for proper operation, as shown on Figure 11. An advantage of the open−drain output includes the ability to “wire AND” several outputs together to form an inexpensive logic circuit. It is also possible to have the pull−up resistor connected to a different supply which can be higher than the CAT803 VCC pin. The value of the pull−up resistor is not critical in most applications, typical values being between 5 k W and 10 kW. Figure 11. Typical CAT803 Open−Drain Circuit Configuration CAT803 GND Power Supply GND mP VCC VCC 5 kW RESET RESET INPUT |
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