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SN74GTL2003 Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce SN74GTL2003
Description  8-Bit Bidirectional Low-Voltage Translator
Download  25 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

SN74GTL2003 Fiches technique(HTML) 11 Page - Texas Instruments

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0
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0
100
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300
400
500
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700
800
900 1000
Time (ps)
CPU I/O
Chipset I/O
C001
( )
( )
Pullup voltage V
0.35 V
Resistor value
0.015 A
-
W =
SN74GTL2003
www.ti.com
SCDS305B – FEBRUARY 2011 – REVISED JUNE 2015
Typical Applications (continued)
9.2.1.1 Design Requirements
SN74GTL2003 requires industry standard GTL and LVTTL/TTL voltage levels.
Place pullup resistors of ~200k
Ω in all inputs/outputs to the GTL/TTL voltage levels.
Place 0.1-
μF bypass capacitors close to the power supply pins to reduce errors coupling in from noisy or
high-impedance power supplies.
Comply to the parameters in the Recommended Operating Conditions
9.2.1.2 Detailed Design Procedure
9.2.1.2.1
Sizing Pullup Resistors
The pullup resistor value should limit the current through the pass transistor when it is in the on state to about 15
mA. This ensures a pass voltage of 260 mV to 350 mV. If the current through the pass transistor is higher than
15 mA, the pass voltage also is higher in the on state. To set the current through each pass transistor at 15 mA,
the pullup resistor value is calculated as:
(1)
Table 4 shows resistor values for various reference voltages and currents at 15 mA, 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 device at 0.175 V, although the 15 mA only applies to current flowing through
the SN74GTL2003.
Table 4. Pullup Resistor Values(1)(2)(3)
PULLUP RESISTOR VALUE (
Ω)
15 mA
10 mA
3 mA
VOLTAGE
NOMINAL
+10%
NOMINAL
+10%
NOMINAL
+10%
5.0 V
310
341
465
512
1550
1705
3.3 V
197
217
295
325
983
1082
2.5 V
143
158
215
237
717
788
1.8 V
97
106
145
160
483
532
1.5 V
77
85
115
127
383
422
1.2 V
57
63
85
94
283
312
(1)
Calculated for VOL = 0.35 V
(2)
Assumes output driver VOL = 0.175 V at stated current
(3)
+10% to compensate for VDD range and resistor tolerance
9.2.1.3 Application Curve
Figure 7. Signal Voltage vs Time (ps) (Simulated Design Results)
Copyright © 2011–2015, Texas Instruments Incorporated
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