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MC74VHCT244A_14 Datasheet, PDF (5/7 Pages) ON Semiconductor – Octal Bus Buffer/Line Driver with 3-State Outputs
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MC74VHCT244A
A or B
tPLH
YA or YB
1.5 V
1.5 V
3V
GND
tPHL
VOH
VOL
Figure 3. Switching Waveform
OEA or OEB
YA or YB
YA or YB
1.5 V
tPZL
tPLZ
1.5 V
tPZH
tPHZ
1.5 V
3V
GND
HIGH
IMPEDANCE
VOL +0.3 V
VOH -0.3 V
HIGH
IMPEDANCE
Figure 4. Switching Waveform
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
CL*
*Includes all probe and jig capacitance
Figure 5. Test Circuit
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
1 kW
CL*
CONNECT TO VCC WHEN
TESTING tPLZ AND tPZL.
CONNECT TO GND WHEN
TESTING tPHZ AND tPZH.
*Includes all probe and jig capacitance
Figure 6. Test Circuit
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