Wednesday, February 29, 2012

Digital questions-2


A 0.01-F capacitor is recommended by TTL manufacturers for ________ the power supply.

A.

decoupling

B.

filtering

C.

rectifying

D.

grounding



7.

Why does the data sheet for the 7476 only give a minimum value for the clock pulse width (both HIGH and LOW)?

A.

nominal value

B.

best-case condition

C.

worst-case condition



8.

Why is the Schmitt trigger needed in the 60-Hz TTL-level clock pulse generator?

A.

to provide a triangle wave

B.

to provide a sine wave

C.

to provide a rounded pulse waveform

D.

to provide a sharp pulse waveform


9.

The main concern when using a pull-down resistor is:

A.

the low power dissipation of the resistor

B.

it will keep a floating terminal LOW

C.

the high power dissipation of the resistor

D.

it will cause false triggering


10.

Look up the propagation delay from the clock to the output for the 7476. Are the HIGH-to-LOW and LOW-to-HIGH propagation delays the same?

A.

yes

B.

no, tPLH = 25 ns, tPHL = 40 ns

C.

no, tPLH = 40 ns, tPHL = 25 ns

D.

no, tPHL = 25 ns, tPLH = 40 ns


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