The SN74GTL3004 provides for a selectable GTL Voltage Reference (GTL VREF). The value of the GTL VREF can be adjusted using S0 and S1 select pins.
The S0 and S1 pins contain glitch-suppression circuitry for excellent noise immunity. When left floating, the S0 and S1 control input pins have 100-kµ pullups that set the GTL VREF default value to the 0.67 × VTT ratio
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(S0 = 1 and S1 =1).