Integrated-Circuit Logic Families Questions

• A logic signal experiences a delay in going through a circuit. The two propagation delay times are defined as:
• What is the increase in switching speed between 74LS series TTL and 74HC/HCT (High-Speed CMOS)?
• What type of circuit is shown below, and how is the output ordinarily connected?
• Generally, the voltage measured at an unused TTL input would typically be measured between:
• Refer the given figure. Which of the following describes the operation of the circuit?
• What must be done to interface TTL to CMOS?
• What is unique about TTL devices such as the 74S00?
• What type of circuit is represented in the given figure, and which statement best describes its operation?
• Which of the following summarizes the important features of ECL?
• Logic circuits that are designated as buffers, drivers, or buffer/drivers are designed to have:
• Power-supply decoupling uses a radio-frequency capacitor to short out high frequency spikes.
• The CMOS series that is pin-compatible with the TTL family is the 4000 series.
• The fan-out of CMOS gates is frequency dependent.
• The 74XX series TTL operates using saturated switching in which many of the transistors, when conducting, will be in the saturated condition.
• The maximum current for a LOW output on a standard TTL gate is 100 µA.
• A major drawback in using ECL logic circuits in conjunction with TTL and MOS circuits is its negative supply voltages and logic levels.
• Integrated injection logic offers high component density and is easier to fabricate than TTL.
• The noise immunity of a logic circuit refers to the circuit's ability to tolerate noise by causing spurious charges in the output voltage.
• A current-sourcing transistor may also be referred to as a pull-down transistor.
• 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.