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MC33064D-5R2G Folha de dados(PDF) 4 Page - ON Semiconductor |
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MC33064D-5R2G Folha de dados(HTML) 4 Page - ON Semiconductor |
4 / 12 page MC34064, MC33064, NCV33064 http://onsemi.com 4 Figure 8. Clamp Diode Forward Current versus Voltage Figure 9. Low Voltage Microprocessor Reset Figure 10. Low Voltage Microprocessor Reset with Additional Hysteresis 80 60 40 20 0 0 0.4 0.8 1.2 1.6 VF , FORWARD VOLTAGE (V) Vin = 0 V TA = 25°C A time delayed reset can be accomplished with the addition of CDLY. For systems with extremely fast power supply rise times (<500 ns) it is recommended that the RCDLY time constant be greater than 5.0 ms. Vth(MPU) is the microprocessor reset input threshold. tDLY = RCDLY In 1 1 − Vth(MPU) Power Supply + − 2 (2) R 1 (1) Reset CDLY Microprocessor Circuit 1.2 Vref 3 (4) − + Power Supply + − 2 (2) RL 1 (1) Reset Microprocessor Circuit 1.2Vref 3 (4) − + VH ≈ 4.6 RH + 0.02 DVth(lower) ≈ 340 RH x 10−6 Where:RH ≤ 150 W Where: RL ≥ 1.5 W, ≤ 10 kW Comparator hysteresis can be increased with the addition of resistor RH. The hysteresis equation has been simplified and does not account for the change of input current Iin as VCC crosses the comparator threshold (Figure 4). An increase of the lower threshold DVth(lower) will be observed due to Iin which is typically 340 mA at 4.59V. The equations are accurate to ±10% with RH less than 150 W and RL between 1.5 kW and 10 kW. Iin RH Vin RL TEST DATA VH (mV) DVth (mV) RH ( W) RL (k W) 20 51 40 81 71 112 100 164 190 327 276 480 0 3.4 6.8 6.8 10 10 16 16 34 34 51 51 0 10 20 20 30 30 47 47 100 100 150 150 0 1.5 4.7 1.5 2.7 1.5 2.7 1.5 2.7 1.5 2.7 1.5 |
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