Q.1

The number of inputs that a gate output can drive without possible logic errors is the _______.

  • propagation delay
  • noise margin
  • speed-power product
  • fanout
Q.2

The TTL HIGH level source current is higher than the LOW level sinking current.

  • True
  • False
Q.3

When an IC has two rows of parallel connecting pins, the device is referred to as:

  • a QFP
  • a DIP
  • a phase splitter
  • CMOS
Q.4

The term buffer/driver signifies the ability to provide low output currents to drive light loads.

  • True
  • False
Q.5

Which of the following summarizes the important features of emitter-coupled logic (ECL)?

  • negative voltage operation, high speed, and high power consumption
  • good noise immunity, negative logic, high frequency capability, low power dissipation, and short propagation time
  • slow propagation time, high frequency response, low power consumption, and high output voltage swings
  • poor noise immunity, positive supply voltage operation, good low-frequency operation, and low power
Q.6

Totem pole outputs _________ be connected __________ because ____________.

  • can, in parallel, sometimes higher current is required
  • cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
  • should, in series, certain applications may require higher output voltage
  • can, together, together they can handle larger load currents and higher output voltages
Q.7

In order to get a HIGH or a LOW output from an open-collector gate, an external _________ must be connected between +VCC and the collector.

  • pull-down resistor
  • pull-up resistor
  • diode
  • buffer
Q.8

Integrated-injection logic offers high component density and is easier to fabricate than TTL.

  • True
  • False
Q.9

Which digital IC package type makes the most efficient use of printed circuit board space?

  • SMT
  • TO can
  • flat pack
  • DIP
Q.10

What quantities must be compatible when interfacing two different logic families?

  • only the currents
  • both the voltages and the currents
  • only the voltages
  • both the power dissipation and the impedance
Q.11

An open collector output can ________ current, but it cannot ___________________.

  • sink, source current
  • source, sink current
  • sink, source voltage
  • source, sink voltage
Q.12

An undefined state, neither high nor low, is called _________.

  • don't care
  • floating
  • minimum state
  • noise
Q.13

CMOS logic is probably the best all-around circuitry because of its:

  • packing density
  • low power consumption
  • very high noise immunity
  • low power consumption and very high noise immunity
Q.14

The output current capability of a single 7400 NAND gate when HIGH is called _____________.

  • source current
  • sink current
  • IOH
  • source current or IOH
Q.15

When the output of a standard TTL gate is HIGH, it can ___________________.

  • sink 16 mA of current from the attached input gates
    mu.gif
    mu.gif
  • source 400 mu.gifA of current to no more than 10 attached gates
  • source 16 mA of current to no more than 10 attached gates
    mu.gif
  • sink a maximum of 400 mu.gifA from no more than 10 load gates
0 h : 0 m : 1 s