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| GTL2010 Datasheet, PDF (11/15 Pages) NXP Semiconductors – 10-bit GTL Processor Voltage Clamp | |||
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GTL2010
10-BIT BIDIRECTIONAL LOW-VOLTAGE TRANSLATOR
SCDS221 â SEPTEMBER 2006
APPLICATION INFORMATION (continued)
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 (SREF) 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.
VDPU = 5V
VREF = 1.8V
RPU
RPU
200K Ω
SREF
GTL2010
GREF
DREF
RPU
RPU
CPU I/O
S1
SW
D1
S2
D2
SW
Chipset
I/O
Sn
Dn
GND
Figure 7. Unidirectional Up Translation to Higher-Voltage Chipsets
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