A current-sourcing transistor may also be referred to as a pull-down transistor.

More Questions from Integrated-Circuit Logic Families

• An unused input of a NAND gate can be left unconnected, pulled high by a pull-up resistor and tied together with another input and not change the logic output.
• The major advantage of CMOS logic circuits over TTL is very low power consumption.
• The abbreviated designator for a HIGH input voltage is VIH.
• CMOS stands for "complementary metal-oxide semiconductors" and the FETs are normally enhancement mode devices.
• The TTL HIGH level source current is higher than the LOW level sinking current.
• Usually P-MOS and N-MOS circuits are identical with the exception of the voltage polarities.
• The time it takes for a square wave to go from 10% to 90% of its voltage level is called propagation delay.
• A common means for measuring and comparing the overall performance of an IC family is the speed-power product.
• The noise margin for TTL is 0.8 V.
• The data sheet for the 74 series of TTL ICs shows that Vcc has a range of 4.5 V to 5.5 V.

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