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CAT812JTBI-T3 Datasheet(PDF) 7 Page - Catalyst Semiconductor |
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CAT812JTBI-T3 Datasheet(HTML) 7 Page - Catalyst Semiconductor |
7 / 11 page CAT811, CAT812 © Catalyst Semiconductor, Inc. 7 Doc. No. MD-3005 Rev. S Characteristics subject to change without notice VALID RESET WITH VCC UNDER 1.0V To ensure that the CAT811 RESET ¯¯¯¯¯¯ pin is in a known state when VCC is under 1.0V, a 100kΩ pull-down resistor between RESET ¯¯¯¯¯¯ pin and GND is recommended; the value is not critical. For the CAT812, a pull-up resistor from RESET pin to VCC is needed. Figure 3. RESET ¯¯¯¯¯¯ Valid with VCC under 1.0V Figure 4. RESET Valid with VCC under 1.1V BI-DIRECTIONAL RESET PIN INTERFACING The CAT811/812 can interface with µP/µC bi- directional reset pins by connecting a 4.7kΩ resistor in series with the CAT811/812 reset output and the µP/µC bi-directional reset pin. Figure 5. Bi-directional Reset Pin Interfacing VCC GND 100kΩ CAT811 MR RESET Power Supply VCC GND 100kΩ CAT812 MR RESET Power Supply GND 4.7kΩ CAT811 CAT811 MR GND BUF RESET INPUT RESET RESET Power Supply µP (for example: 68HC11) Buffered Bi-directional I/O Pin VCC |
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