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MC74HC257 View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
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MC74HC257
Quad 2-Input Data Selector/Multiplexer with 3-State Outputs
Motorola => Freescale
MC74HC257 Datasheet PDF : 6 Pages
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MC74HC257
SWITCHING WAVEFORMS
tr
NIBBLE INPUT
A OR B
tPLH
OUTPUT Y
90%
50%
10%
90%
50%
10%
tTLH
tf
VCC
GND
tPHL
tTHL
SELECT
tPLH
OUTPUT Y
VALID
50%
50%
VALID
VCC
GND
tPHL
Figure 1.
Figure 2.
OUTPUT
ENABLE
OUTPUT Y
OUTPUT Y
50%
tPZL tPLZ
50%
tPZH tPHZ
50%
Figure 3.
VCC
GND
HIGH
IMPEDANCE
10% VOL
90% VOH
HIGH
IMPEDANCE
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
CL*
TEST CIRCUITS
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
1 k
Ω
CL*
CONNECT TO VCC WHEN
TESTING tPLZ AND tPZL.
CONNECT TO GND WHEN
TESTING tPHZ AND tPZH.
* Includes all probe and jig capacitance
Figure 4.
* Includes all probe and jig capacitance
Figure 5.
MOTOROLA
4
High–Speed CMOS Logic Data
DL129 — Rev 6
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