E6C11
CIRCUIT COMPONENTS · Digital ICs: families of digital ICs; gates; programmable logic devices
E6C11E6C →
In Figure E6-3, which is the schematic symbol for the NOT operation (inversion)?
- A2
- B4
- C5
- D6
Why The NOT gate, or inverter, is drawn as a plain triangle pointing at its output with a small circle (bubble) at the tip. The triangle alone is a buffer; the bubble is what says "invert," so the output is the logical complement of the single input. Unlike every other gate in the figure, it has only one input, which is the quickest way to spot it. In Figure E6-3 that symbol is number 5.
Watch out The other numbered symbols are two-input gates: AND and NAND use the flat-backed D shape, OR and NOR use the curved shield shape, and the ones with bubbles on their outputs (NAND, NOR) are inverted versions of two-input functions, not simple inversion.
One input, triangle plus bubble equals NOT. Bubble always means invert; count the inputs to tell NOT from NAND/NOR.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
The rest of E6C
- E6C01 What is the function of hysteresis in a comparator?
- E6C02 What happens when the level of a comparator's input signal crosses the threshold voltage?
- E6C03 What is tri-state logic?
- E6C04 Which of the following is an advantage of BiCMOS logic?
- E6C05 Which of the following digital logic families has the lowest power consumption?
- E6C06 Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?
- E6C07 What best describes a pull-up or pull-down resistor?
- E6C08 In Figure E6-3, which is the schematic symbol for a NAND gate?
- E6C09 What is used to design the configuration of a field-programmable gate array (FPGA)?
- E6C10 In Figure E6-3, which is the schematic symbol for a NOR gate?
- E6C11 In Figure E6-3, which is the schematic symbol for the NOT operation (inversion)?