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PC87373 데이터시트(PDF) 117 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 PC87373
상세설명  LPC SuperI/O with Glue Functions
PDF  174 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87373 데이터시트(HTML) 117 Page - National Semiconductor (TI)

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9.0 Glue Functions (Continued)
117
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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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