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PC87373 数据表(PDF) 117 Page - National Semiconductor (TI) |
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PC87373 数据表(HTML) 117 Page - National Semiconductor (TI) |
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117 / 174 page  9.0 Glue Functions (Continued) 117 www.national.com Revision 1.1 The voltage levels at both sides of switch “S” are measured by the comparator (“Comp”), which controls the state of the switch as follows: q If VA >VB, then VDD3 >VDD5; the switch is closed, and the output voltage VREF5V =VDD3. q If VA <VB, then VDD3 <VDD5; the switch is open, and the output voltage VREF5V =VDD5, through the external 1KΩ resistor, is connected to the VDD5 power supply. The internal circuit is powered from the VDD3 supply. For VDD3 <VSO, switch “S” is open; therefore, the VREF5V output tracks only the VDD5 supply. Figure 22 shows REF5 output in four cases of VDD3 and VDD5 ramp up and ramp down. Figure 22. REF5 as a Function of VDD3 and VDD5 Table 44 defines the DC characteristics of the REF5 output, relative to the VDD3 supply. For the AC characteristics, see High- est Active Main and Standby Supply Reference on page 170. Table 44. REF5V DC Characteristics Symbol Parameter Conditions Min Max Unit VSO Switch Open, VDD3 Voltage Range 0 < VDD5 < 5.5V 0 1.51 1. Not tested. Guaranteed by characterization. V VTRK Output Voltage Tracking of VDD3 Voltage 1, 1.5V < VDD3, VDD5 <VDD3 + 150 mV − 150 + 150 mV a. VDD3 Ramps Up Before and Ramps Down After VDD5 0V VSO 3.3V 5V VDD3 VDD5 REF5V b. VDD3 Ramps Up After and Ramps Down Before VDD5 0V VSO 3.3V 5V VDD3 VDD5 REF5V VDD3 REF5V VDD3 VDD5 |
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