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Unidirectional Down Translation
S
REF
D
REF
G
REF
SW
SW
GTL2010
D1
S1
D2
S2
Sn
GND
Dn
V =5V
DPU
V =1.8V
REF
200K Ω
CPUI/O
Chipset
I/O
GTL2010
10-BIT BIDIRECTIONAL LOW-VOLTAGE TRANSLATOR
SCDS221 – SEPTEMBER 2006
APPLICATION INFORMATION (continued)
For unidirectional clamping (higher voltage to lower voltage), the G
REF
input must be connected to D
REF
and both
pins pulled to the higher-side V
CC
through a pullup resistor (typically 200 k Ω ). A filter capacitor on D
REF
is
recommended. Pullup resistors are required if the chipset I/Os are open drain. The opposite side of the
reference transistor (S
REF
) is connected to the processor core power-supply voltage. When D
REF
is connected
through a 200-k Ω resistor to a 3.3-V to 5.5-V V
CC
supply and S
REF
is set between 1 V to V
CC
– 1.5 V, the output
of each Sn has a maximum output voltage equal to S
REF
.
Figure 6. Unidirectional Down Translation to Protect Low-Voltage Processor Pins
10
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