GTL2002 查看數據表（PDF） - Philips Electronics
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GTL2002 Datasheet PDF : 24 Pages
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Figure 8. V – I Electrical Chacteristics at VSREF = 1.0 Volt
As can be seen in Figure 8, the current is controlled by the 150 Ω resistor on the drain (RDn) until the source voltage is
within about 0.5 volts of the SREF voltage where the pass transistor resistance increases rapidly to the point that the
current through the pass transistor is just a few µA. This occurs as the source (Sn) voltage reaches the SREF voltage.
In any system, or logic level definition, there is a maximum low level input voltage (Vil) specified for the device. When
a GTL-TVC device is used, the series combination of the driver and GTL-TVC device must not exceed the maximum
Vil allowed for the logic family. Normally the allowed low level voltage is divided between the driver and the GTL-TVC
device. If the driver is weak or the allowed low level voltage is small, it would be necessary to operate at a lower current
than 15 mA. For example, if the GTL-TVC device is used as a translator for an I2C bus, the current would be limited to 3
mA. On the other hand, if the driver is very strong and/or the allowed low level is large, it may be possible to operate the
GTL-TVC device at currents higher than 15 mA, but in this case, it must be remembered that the voltage drop across the
device will be greater than the 0.175 V maximun specified in the electrical characteristics of the data sheet.
0
0.0E+00
-2.0E-03
-4.0E-03
-6.0E-03
-8.0E-03
-1.0E-02
-1.2E-02
-1.4E-02
-1.6E-02
-1.8E-02
-2.0E-02
-2.2E-02
0.25 0.5 0.75
1 1.25 1.5 1.75 2 2.25 2.5
VDDref = 3.3v
VDDpass = 3.3v
RDn = 150 ohms
RDref = 200k
VSn (V)
Vsref = 1.5v
25 deg C
85 deg C
-40 deg C
Figure 9. V-I Electrical Characteristics at VSREF = 1.5 Volt
0
0.0E+00
-2.0E-03
-4.0E-03
-6.0E-03
-8.0E-03
-1.0E-02
-1.2E-02
-1.4E-02
-1.6E-02
-1.8E-02
-2.0E-02
-2.2E-02
0.25 0.5 0.75
1 1.25 1.5 1.75 2 2.25 2.5
VDDref = 3.3v
VDDpass = 3.3v
RDn = 150 ohms
RDref = 200k
VSn (V)
Vsref = 2v
25 deg C
85 deg C
-40 deg C
Figure 10. V-I Electrical Characteristics at VSREF = 2.0 Volt
9
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