Fundamentals of IC Testing 1

What is VIL test?

• to test the voltage of the output pins at logic high

• to test the voltage of the output pins at logic low

• to test the voltage of the input pins at logic low

• to test the voltage of the input pins at logic high

Why edge strobe is not a perfect test?

• it is only works for signal with low noise

• it is a faster method of strobing

• it is only one point of strobe

• noise cud come out of window

Mary searched two ICs on the VOL, IC1 measured 0.79V, and IC2 measured 0.81V. Which one is correct?

• IC1 and IC2 can be used

• IC2 can be used but IC1 need to be scrapped

• both of the ICs need to be scrapped

• Mary shud keep IC1

Sam did a search on two ICs, IC1 has VOH 2.42V and IC2 has VOH 2.401V. Which one is true

• Sam shud keep both of the units

• IC1 failed but IC2 passed

• IC1 passed but IC2 failed

• Sam should change his specs limits

What are patterns?

• supply the logic state for a pin

• supply the levels test for each of the logics

• supply when to strobe and when to compare

• all of them

An IC has 300 input pins. How many pattern resources that it needs from a tester?

• 100

• 200

• 300

• 400

The setup time for a pin is 10ns, how do you measure whether a unit pass or fail?

• set setup time at 10ns at tester, check output signal

• set setup time at 8ns at tester, check output signal

• set setup time at 12ns at tester, check output signal

• set setup time at 11ns at tester, check output signal

What is Tp?

• Setup time

• Hold time

• Rise Time

• Propagation delay

How do you test setup time for 100 pins?

• must use a pattern set.

• loop 100 times in different clock cycle

• measure manually

• it can not be measured

Which one is not true?

• it requires 13 CLK cycles to perform a basic functional test

• each AND gate is independent

• if one of the AND gate is damaged, the rest still can be used

• if one of the AND gate is damaged, you can't use the other gates.