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參數(shù)資料
| 型號： | AN10145 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Bi-directional low voltage translators |
| 中文描述： | 雙向低電壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 325K |
| 代理商： | AN10145 |
13
Calculating Pull-Up Resistor Values
The pull-up resistor value needs to limit the current through the pass transistor when it is in the "on" state to about 15
mA. This will guarantee a pass voltage of 260 to 350 mV. If the current through the pass transistor is higher than 15
mA, the pass voltage will also be higher in the "on" state. To set the current through each pass transistor at 15 mA,
calculate the pull-up resistor value as follows:
Table 3 below summarizes resistor values for various reference voltages and currents at 15 mA and also at 10 mA and 3
mA. The resistor value shown in the highlighted box or a larger value should be used to ensure that the pass voltage of
the transistor would be 350 mV or less. The external driver must be able to sink the total current from the resistors on
both sides of the GTL-TVC device at 0.175 V, although the 15 mA only applies to current flowing through the GTL-
TVC device.
Pull Up Resistor value (ohms)
15 mA
10 mA
Voltage
Nominal
+ 10 %
Nominal
5.0 V
310
341
465
3.3 V
197
217
295
2.5 V
143
158
215
1.8 V
97
106
145
1.5 V
77
85
115
1.2 V
57
63
85
1) Calculated for Vol = 0.35 V
2) Assumes output driver Vol = 0.175 V at stated current.
3) + 10 % to compensate for V
DD
range and resistor tolerance.
Table 3. Pull Up Resistor Values
Alternate Sources
The Texas Instruments TVC devices operate the same as the Philips Semiconductors GTL-TVC devices but have
different names for the connections as shown in table 4. The data sheet specifications are marginally different. The Texas
Instruments TVC devices are CMOS construction.
Philips Semiconductors GTL-TVC
GREF
DREF
SREF
Table 4. Device Pin Name Comparison
3 mA
+ 10 %
512
325
237
160
127
94
Nominal
1550
983
717
483
383
283
+ 10 %
1705
1082
788
532
422
312
Texas Instruments TVC
GATE
Vbias
Vref
Resistor Value (in
) =
V
pull-up
(in V) - 0.350 V
0.015 A
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