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SEMICONDUCT OR

Test Circuits and Waveforms

FIGURE 1. HC AND HCU TRANSITION TIMES AND PROPAGA-

TION DELAY TIMES, COMBINATION LOGIC

FIGURE 2. HCT TRANSITION TIMES AND PROPAGATION

DELAY TIMES, COMBINATION LOGIC

90%

50%

10%

50%

10%

INVERTING

OUTPUT

INPUT

GND

90%

2.7V

1.3V

0.3V

1.3V

10%

INVERTING

OUTPUT

INPUT

GND

3V

90%

CD74HC157, CD74HCT157, CD74HC158, CD74HCT158