7 Parameter Measurement Information

• Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators

having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tt < 6 ns.

• The outputs are measured one at a time, with one input transition per measurement.

CL

(1)

From Output

Under Test

Test

Point

A.

CL= 50 pF and includes probe and jig capacitance.

Figure 7-1. Load Circuit

VOH

VOL

Output

VCC

0 V

Input

tf

(1)

tr

(1)

90%

10%

90%

10%

tr

(1)

90%

10%

tf

(1)

90%

10%

A.

tt is the greater of tr and tf.

Figure 7-2. Voltage Waveforms Transition Times

50%

Input

50%

VCC

0 V

50%

50%

VOH

VOL

tPLH

(1)

tPHL

(1)

VOH

VOL

tPHL

(1)

tPLH

(1)

Output

Output

50%

50%

A.

The maximum between tPLH and tPHL is used for tpd.

Figure 7-3. Voltage Waveforms Propagation Delays

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CD74HC30, CD54HC30

SCHS121E – AUGUST 1997 – REVISED APRIL 2021

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