gtl2003bq NXP Semiconductors, gtl2003bq Datasheet - Page 7

• Manufacturer Part Number: gtl2003bq
• Description: 8-bit Bidirectional Low Voltage Translator
• Manufacturer: NXP Semiconductors

NXP Semiconductors
GTL2003_1
Product data sheet
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 follows:
Table 6
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.
Table 6.
Calculated for V
[1]
resistor value
Voltage
5.0 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
+ 10 % to compensate for V
summarizes resistor values for various reference voltages and currents at 15 mA
Pull-up resistor values
310
197
143
97
77
57
OL
Nominal
= 0.35 V. Assumes output driver V
=
15 mA
-----------------------------------------------------------------------------
pull-up voltage V
Rev. 01 — 27 July 2007
341
217
158
106
85
63
DD
+ 10 %
range and resistor tolerance.
Pull-up resistor value ( )
0.015 A
[1]
465
295
215
145
115
85
Nominal
–
0.35 V
8-bit bidirectional low voltage translator
OL
10 mA
= 0.175 V at stated current.
512
325
237
160
127
94
+ 10 %
[1]
1550
983
717
483
383
283
Nominal
GTL2003
© NXP B.V. 2007. All rights reserved.
3 mA
1705
1082
788
532
422
312
+ 10 %
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