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MAX6805USD-T Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX6805USD-T Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page 4-Pin, Low-Power µP Reset Circuits with Manual Reset _______________________________________________________________________________________ 5 VCC GND MAX6804 RESET MR 100k Ω (a) VCC GND MAX6803 RESET 100k Ω* (b) *ASSUMES HIGH-Z RESET INPUT TO THE µP MR Figure 2. Ensuring Reset Valid down to VCC = 0 µPs and circuitry do not operate when VCC drops below 1V. For the MAX6804 application where RESET must be valid down to 0, adding a pulldown resistor between RESET and GND removes stray leakage currents, hold- ing RESET low (Figure 2a). The pulldown resistor value is not critical; 100k Ω is large enough not to load RESET, and small enough to pull it low. For the MAX6803, where RESET must be valid to VCC = 0, a 100k Ω pullup resistor between RESET and VCC will hold RESET high when VCC falls below 0.7V (Figure 2b). Since the MAX6805 has an open-drain, active-low out- put, it typically uses a pullup resistor. With this device, RESET will most likely not maintain an active condition, but will drift to a non-active level due to the pullup resistor and the reduced sinking capability of the open- drain device. Therefore, this device is not recommend- ed for applications where the RESET pin is required to be valid down to VCC = 0. 1 2 4 3 VCC MR (RESET) GND MAX6803 MAX6804 MAX6805 SOT143 TOP VIEW RESET ( ) ARE FOR MAX6803 MAX6804 VCC VCC RESET MR RESET GND PUSHBUTTON SWITCH VCC GND µP Pin Configuration Typical Operating Circuit |
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