Datasheet

S
REF
D
REF
G
REF
SW
SW
GTL2003
D1
S1
D2S2
Sn
GND
Dn
R
R
R
PU
PU
PU
V = 1.8V
REF
R
200K
PU
Ω
CPU I/O
Chipset
I/O
V = 5 V
DPU
SN74GTL2003
www.ti.com SCDS305A –FEBRUARY 2011–REVISED MARCH 2013
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, since 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.
Figure 8. Unidirectional Up Translation to Higher-Voltage Chipsets
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