Integrated Circuit Technologies

Q1: Which factor does not affect CMOS loading?

A Charging time associated with the output resistance of the driving gate

B Discharging time associated with the output resistance of the driving gate

C Output capacitance of the load gates

D Input capacitance of the load gates

Q2: For a CMOS gate, which is the best speed-power product?

A 1.4 pJ

B 1.6 pJ

C 2.4 pJ

D 3.3 pJ

Q3: A TTL NAND gate with IIL(max) of –1.6 mA per input drives eight TTL inputs. How much current does the drive output sink?

A –12.8 mA

B –8 mA

C –1.6 mA

D –25.6 mA

Q4: A TTL NAND gate with IIH(max) of 40 A per input drives ten TTL inputs. How much current does the drive output source?

A 40 A

B 200 A

C 400 A

D 800 A

Q5: PMOS and NMOS circuits are used largely in ________.

A MSI functions

B LSI functions

C diode functions

D TTL functions

Q6: Which transistor element is used in CMOS logic?

A FET

B MOSFET

C Bipolar

D Unijunction

Q7: It is best not to leave unused TTL inputs unconnected (open) because of TTL's ________.

A noise sensitivity

B low-current requirement

C open-collector outputs

D tristate construction

Q8: In a TTL circuit, if an excessive number of load gate inputs are connected, ________.

A VOH(min) drops below VOH

B VOH drops below VOH(min)

C VOH exceeds VOH(min)

D VOH and VOH(min) are unaffected

Q9: A standard TTL circuit with a totem-pole output can sink, in the LOW state (IOL(max)), ________.

A 16 mA

B 20 mA

C 16 A

D 20 A

Q10: An open-collector output requires ________.

A a pull-down resistor

B a pull-up resistor

C no output resistor

D an output resistor

Q11: Which equation is correct?

A VNL = VIL(max) + VOL(max)

B VNH = VOH(min) + VIH(min)

C VNL = VOH(min) – VIH(min)

D VNH = VOH(min) – VIH(min)

Q12: Which logic family combines the advantages of CMOS and TTL?

A BiCMOS

B TTL/CMOS

C ECL

D TTL/MOS

Q13: Which is not part of emitter-coupled logic (ECL)?

A Differential amplifier

B Bias circuit

C Emitter-follower circuit

D Totem-pole circuit

Q14: The nominal value of the dc supply voltage for TTL and CMOS is ________.

A +3 V

B +5 V

C +9 V

D +12 V

Q15: If ICCH is specified as 1.1 mA when VCC is 5 V and if the gate is in a static (noncharging) HIGH output state, the power dissipation (PD) of the gate is ________.

A 5.5 mW

B 5.5 W

C 5 mW

D 1.1 mW

Q16: Which is not a MOSFET terminal?

A Gate

B Drain

C Source

D Base

Q17: Most TTL logic used today is some form of ________.

A Schottky TTL

B tristate TTL

C low-power TTL

D open-collector TTL

Q18: The greater the propagation delay, the ________.

A lower the maximum frequency

B higher the maximum frequency

C maximum frequency is unaffected

D minimum frequency is unaffected

Q19: One output structure of a TTL gate is often referred to as a ________.

A totem-pole arrangement

B diode arrangement

C JBT arrangement

D base, emitter, collector arrangement

Q20: An open-drain gate is the CMOS counterpart of ________.

A an open-collector TTL gate

B a tristate TTL gate

C a bipolar junction transistor

D an emitter-coupled logic gate

Q21: Which is not a precaution for handling CMOS?

A Devices should be placed with pins down on a grounded surface, such as a metal plate.

B All tools, test equipment, and metal workbenches should be earth grounded.

C CMOS devices should not be inserted into sockets or PC boards with the power on.

D Wear wool clothes at all times.

Q22: Which is not an output state for tristate logic?

A HIGH

B LOW

C High-Z

D Low-Z

Q23: The active switching element used in all TTL circuits is the ________.

A bipolar junction transistor (BJT)

B field-effect transistor (FET)

C metal-oxide semiconductor field-effect transistor (MOSFET)

D unijunction transistor (UJ)

Q24: A certain gate draws 1.8 A when its output is HIGH and 3.3 µA when its output is LOW. VCC is 5 V and the gate is operated on a 50% duty cycle. What is the average power dissipation (PD)?

A 2.55 W

B 1.27 W

C 12.75 W

DW

Q25: TTL is alive and well, particularly in ________.

A industrial applications

B educational applications

C military applications

D commercial applications


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