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| 型號： | GTL2002D |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 電壓/頻率轉(zhuǎn)換 |
| 英文描述： | 2-bit bidirectional low voltage translator |
| 封裝： | GTL2002D/DG<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<Always Pb-free,;GTL2002D<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 5, 2 |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 129K |
| 代理商： | GTL2002D |
GTL2002_7
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 07 — 2 July 2009
7 of 22
NXP Semiconductors
GTL2002
2-bit bidirectional low voltage translator
8.4 Sizing pull-up resistor
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 mV 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, the
pull-up resistor value is calculated as shown in
Equation 1
:
(1)
Table 6
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 +10 % column 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. See application note AN10145, “Bidirectional low
voltage translators”for more information.
[1]
Calculated for V
OL
= 0.35 V.
Assumes output driver V
OL
= 0.175 V at stated current.
+ 10 % to compensate for V
DD
range and resistor tolerance.
[2]
[3]
Table 6.
Pull-up resistor values
Pull-up resistor value (
)
[1]
Voltage
15 mA
[2]
10 mA
[2]
3 mA
[2]
Nominal
310
197
143
97
77
57
+ 10 %
[3]
341
217
158
106
85
63
Nominal
465
295
215
145
115
85
+ 10 %
[3]
512
325
237
160
127
94
Nominal
1550
983
717
483
383
283
+ 10 %
[3]
1705
1082
788
532
422
312
5.0 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
resistor value
(
)
pull
-
up voltage V
---------------------------------------------------------------------------
0.35 V
–
0.015 A
=
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