Unused TTL inputs should be tied LOW.

More Questions from Integrated Circuit Technologies

• There are four different logic level ranges for TTL and CMOS: VIL, VIH, VOL, and VOH.
• ECL IC technology is faster than TTL technology.
• The speed-power product provides a basis for the comparison of logic circuits when power dissipation and propagation delay are important considerations in the selection of the type of logic to be used.
• A pull-down resistor must be used with open-collector TTL circuits.
• Power dissipation is a measure of a circuit's noise immunity.
• CMOS is a more dominant IC technology than TTL.
• The total sink current decreases with an increase in each load gate input.
• The greater the propagation delay, the higher the maximum frequency.
• Metal-oxide semiconductor field-effect transistors (MOSFETs) are the active switching elements in CMOS circuits.

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