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Unidirectional Up Translation
S
REF
D
REF
G
REF
SW
SW
GTL2010
D1
S1
D2S2
Sn
GND
Dn
R
PU
R
PU
R
PU
V =5V
DPU
V =1.8V
REF
R
PU
200K Ω
CPUI/O
Chipset
I/O
GTL2010
10-BIT BIDIRECTIONAL LOW-VOLTAGE TRANSLATOR
SCDS221 – SEPTEMBER 2006
APPLICATION INFORMATION (continued)
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 7. Unidirectional Up Translation to Higher-Voltage Chipsets
11
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