GTL2010 Datasheet, PDF (10/15 Pages) NXP Semiconductors – 10-bit GTL Processor Voltage Clamp

GTL2010
10-BIT BIDIRECTIONAL LOW-VOLTAGE TRANSLATOR
SCDS221 – SEPTEMBER 2006
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APPLICATION INFORMATION (continued)
Unidirectional Down Translation
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 kΩ). 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-kΩ 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.
V_DPU = 5V
V_REF = 1.8V
S_REF
GTL2010
G_REF
D_REF
200K Ω
CPU I/O
S1
SW
D1
S2
D2
SW
Sn
Dn
GND
Chipset
I/O
Figure 6. Unidirectional Down Translation to Protect Low-Voltage Processor Pins
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