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MC54-74HC251 Datasheet(PDF) 4 Page - Motorola, Inc

Part No. MC54-74HC251
Description  8-Input Data Selector/Multiplexer with 3-State Outputs
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC54-74HC251 Datasheet(HTML) 4 Page - Motorola, Inc

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MC54/74HC251
MOTOROLA
High–Speed CMOS Logic Data
DL129 — Rev 6
4
SWITCHING WAVEFORMS
Figure 1.
Figure 2.
Figure 3.
VCC
GND
tf
tr
INPUT D
OUTPUT Y
10%
50%
90%
10%
50%
90%
tTLH
tPLH
tPHL
tTHL
tr
tf
VCC
GND
INPUT D
OUTPUT Y
tPHL
tPLH
tTLH
tTHL
10%
50%
90%
10%
50%
90%
VCC
GND
50%
INPUT A
tPLH
tPHL
50%
OUTPUT
Y OR Y
Figure 4.
VALID
VALID
OUTPUT
ENABLE
Y OR Y
Y OR Y
50%
50%
50%
90%
10%
tPZL
tPLZ
tPZH
tPHZ
VCC
GND
HIGH
IMPEDANCE
VOL
VOH
HIGH
IMPEDANCE
TEST CIRCUITS
* Includes all probe and jig capacitance
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
Figure 5.
* Includes all probe and jig capacitance
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
Figure 6.
CONNECT TO VCC WHEN
TESTING tPLZ AND tPZL.
CONNECT TO GND WHEN
TESTING tPHZ AND tPZH.
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