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MAX6802UR_D_-T Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX6802UR_D_-T Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 7 page 3-Pin, Low-Power µP Reset Circuits _______________________________________________________________________________________ 5 Table 1. Factory-Trimmed Reset Thresholds TA = +25 °CTA = -40°C to +125°C RESET THRESHOLD SUFFIX MIN TYP (VTH)MAX MIN MAX 48 4.714 4.80 4.886 4.656 4.944 47 4.615 4.70 4.785 4.559 4.841 46 4.547 4.63 4.713 4.491 4.769 45 4.419 4.50 4.581 4.365 4.635 44 4.301 4.38 4.459 4.249 4.511 43 4.223 4.30 4.377 4.171 4.429 42 4.124 4.20 4.276 4.074 4.326 41 4.026 4.10 4.174 3.977 4.223 40 3.928 4.00 4.072 3.880 4.120 39 4.830 3.90 3.970 3.783 4.017 38 3.732 3.80 3.868 3.686 3.914 37 3.633 3.70 3.767 3.589 3.811 36 3.535 3.60 3.665 3.492 3.708 35 3.437 3.50 3.563 3.395 3.605 34 3.339 3.40 3.461 3.298 3.502 33 3.241 3.30 3.359 3.201 3.399 32 3.142 3.20 3.258 3.104 3.296 31 3.025 3.08 3.135 2.988 3.172 30 2.946 3.00 3.054 2.910 3.090 29 2.877 2.93 2.983 2.842 3.018 28 2.750 2.80 2.850 2.716 2.884 27 2.651 2.70 2.749 2.619 2.781 26 2.583 2.63 2.677 2.551 2.709 Ensuring a Valid Reset Output Down to VCC = 0 When VCC falls below 1V and approaches the minimum operating voltage of 0.7V, push/pull-structured reset sinking (or sourcing) capabilities decrease drastically. High-impedance CMOS-logic inputs connected to the RESET pin can drift to indeterminate voltages. This does not present a problem in most cases, since most µPs and circuitry do not operate when VCC drops below 1V. For the MAX6801 application, where RESET must be valid down to 0, adding a pulldown resistor between RESET and GND removes stray leakage cur- rents, holding 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 MAX6800 application, 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 MAX6802 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. |
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