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PARAMETER MEASURMENT INFORMATION

NOTES: A. C includesprobeandtest-fixturecapacitance.

B. Phaserelationshipsbetweenwaveformswerechosenarbitrarily. Allinputpulsesaresuppliedbygeneratorshavingthefollowing

characteristics:PRR

1MHz,Z =50

,t =6ns,t =6ns.

C. Theoutputsaremeasuredoneatatimewithoneinputtransitionpermeasurement.

D.t

andt

arethesameast .

L

O

r

f

PLH

PHL

pd

≤

FromOutput

UnderTest

C =50pF

(seeNote A)

L

LOADCIRCUIT

Test

Point

VOLTAGEWAVEFORMS

INPUTRISE ANDFALL TIMES

Input

90%

90%

50%

50%

10%

10%

t

f

t

r

0V

V

CC

VOLTAGEWAVEFORMS

PROPAGATIONDELAY ANDOUTPUTTRANSITIONTIMES

t

PLH

t

PLH

t

PHL

t

PHL

Input

In-Phase

Output

Out-of-Phase

Output

90%

90%

90%

50%

10%

10%

10%

50%

50%

50%

50%

t

f

t

f

t

r

90%

10%

50%

t

r

V

CC

V

OL

V

OH

V

OH

0V

V

OL

SN54HC08, SN74HC08

QUADRUPLE 2-INPUT POSITIVE-AND GATES

SCLS081F – DECEMBER 1982 – REVISED JANUARY 2007

Figure 1. Load Circuit and Voltage Waveforms

5

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