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MC74LVXT4053DR2G bảng dữ liệu(PDF) 11 Page - ON Semiconductor |
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MC74LVXT4053DR2G bảng dữ liệu(HTML) 11 Page - ON Semiconductor |
11 / 14 page MC74LVXT4053 http://onsemi.com 11 APPLICATIONS INFORMATION The Channel Select and Enable control pins should be at VCC or GND logic levels. VCC being recognized as a logic high and GND being recognized as a logic low. In this example: VCC = )5 V = logic high GND = 0 V = logic low The maximum analog voltage swing is determined by the supply voltages VCC and VEE. The positive peak analog voltage should not exceed VCC. Similarly, the negative peak analog voltage should not go below VEE. In this example, the difference between VCC and VEE is five volts. Therefore, using the configuration of Figure 21, a maximum analog signal of five volts peak−to−peak can be controlled. Unused analog inputs/outputs may be left floating (i.e., not connected). However, tying unused analog inputs and outputs to VCC or GND through a low value resistor helps minimize crosstalk and feedthrough noise that may be picked up by an unused switch. Although used here, balanced supplies are not a requirement. The only constraints on the power supplies are that: VEE − GND = 0 to *6 volts VCC − GND = 2.5 to 6 volts VCC − VEE = 2.5 to 6 volts and VEE v GND When voltage transients above VCC and/or below VEE are anticipated on the analog channels, external Germanium or Schottky diodes (Dx) are recommended as shown in Figure 22. These diodes should be able to absorb the maximum anticipated current surges during clipping. ANALOG SIGNAL Figure 20. Application Example ON 6 7 8 16 +3.0 V ANALOG SIGNAL +3.0 V −3.0 V +3.0 V −3.0 V 11 10 9 TO EXTERNAL CMOS CIRCUITRY 0 to 3.0 V DIGITAL SIGNALS −3.0 V Figure 21. Application Example ANALOG SIGNAL ON 6 7 8 16 +5 V ANALOG SIGNAL +5 V GND +5 V GND 11 10 9 TO EXTERNAL CMOS CIRCUITRY 0 to 5 V DIGITAL SIGNALS ON/OFF 7 8 16 VCC VEE Dx VCC Dx VEE Dx VCC Dx VEE Figure 22. External Germanium or Schottky Clipping Diodes |
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