SN74GTL2003_15 Datasheet, PDF (13/25 Pages) Texas Instruments – 8-Bit Bidirectional Low-Voltage Translator

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SN74GTL2003
SCDS305B – FEBRUARY 2011 – REVISED JUNE 2015
Table 5. Pullup Resistor Values^(1)(2)(3)
VOLTAGE
5.0 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
15 mA
NOMINAL
310
197
143
97
77
57
PULLUP RESISTOR VALUE (Ω)
10 mA
+10%
NOMINAL
+10%
341
465
512
217
295
325
158
215
237
106
145
160
85
115
127
63
85
94
(1) Calculated for V_OL = 0.35 V
(2) Assumes output driver V_OL = 0.175 V at stated current
(3) +10% to compensate for V_DD range and resistor tolerance
3 mA
NOMINAL
1550
983
717
483
383
283
+10%
1705
1082
788
532
422
312
9.2.3 Unidirectional Up Translation
For unidirectional up translation (lower voltage to higher voltage), the reference transistor is connected the same
as for a down translation. A pullup resistor is required on the higher voltage side (Dn or Sn) to get the full HIGH
level, because the GTL device only passes the reference source (S_REF) voltage as a HIGH when doing an up
translation. The driver on the lower voltage side only needs pullup resistors if it is open drain.
V_DPU = 5 V
V_REF = 1.8V
R_PU
R_PU
200K Ω
S_REF
GTL2003
G_REF
D_REF
R_PU
R_PU
CPU I/O
S1
SW
D1
S2
D2
SW
Chipset
I/O
Sn
Dn
GND
Figure 9. Unidirectional Up Translation to Higher-Voltage Chipsets
9.2.3.1 Design Requirements
• SN74GTL2003 requires industry standard GTL and LVTTL/TTL voltage levels.
• Place pullup resistors of ~200kΩ 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
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