Datasheet

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PARAMETER MEASURMENT INFORMATION
NOTES: A. C includesprobeandtest-fixturecapacitance.
B. Phaserelationshipsbetweenwaveformswerechosenarbitrarily. Allinputpulsesaresuppliedbygeneratorshavingthefollowing
characteristics:PRR 1MHz,Z =50 ,t =6ns,t =6ns.
C. Theoutputsaremeasuredoneatatimewithoneinputtransitionpermeasurement.
D.t andt arethesameast .
L
O r f
PLH PHL pd
≤ Ω
FromOutput
UnderTest
C =50pF
(seeNote A)
L
LOADCIRCUIT
Test
Point
VOLTAGEWAVEFORMS
INPUTRISE ANDFALL TIMES
Input
90%
90%
50%
50%
10%
10%
t
f
t
r
0V
V
CC
VOLTAGEWAVEFORMS
PROPAGATIONDELAY ANDOUTPUTTRANSITIONTIMES
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
0V
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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