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MC74HC240A Datasheet(PDF) 4 Page - ON Semiconductor

Part No. MC74HC240A
Description  Octal 3-State Inverting Buffer/Line Driver/Line Receiver
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC74HC240A Datasheet(HTML) 4 Page - ON Semiconductor

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MC74HC240A
http://onsemi.com
4
SWITCHING WAVEFORMS
DATA INPUT
A OR B
OUTPUT
YA OR YB
VCC
GND
tf
tr
90%
50%
10%
90%
50%
10%
tPHL
tPLH
tTHL
tTLH
ENABLE
OUTPUT Y
OUTPUT Y
50%
50%
50%
90%
10%
tPZL
tPLZ
tPZH
tPHZ
VCC
GND
HIGH
IMPEDANCE
VOL
VOH
HIGH
IMPEDANCE
Figure 1.
Figure 2.
*Includes all probe and jig capacitance
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
Figure 3. Test Circuit
*Includes all probe and jig capacitance
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
Figure 4. Test Circuit
CONNECT TO VCC WHEN
TESTING tPLZ AND tPZL.
CONNECT TO GND WHEN
TESTING tPHZ AND tPZH.
1 k
PIN DESCRIPTIONS
INPUTS
A1, A2, A3, A4, B1, B2, B3, B4
(Pins 2, 4, 6, 8, 11, 13, 15, 17)
Data input pins. Data on these pins appear in inverted form
on the corresponding Y outputs, when the outputs are
enabled.
CONTROLS
Enable A, Enable B (Pins 1, 19)
Output enables (active–low). When a low level is applied
to these pins, the outputs are enabled and the devices
function as inverters. When a high level is applied, the
outputs assume the high–impedance state.
OUTPUTS
YA1, YA2, YA3, YA4, YB1, YB2, YB3, YB4
(Pins 18, 16, 14, 12, 9, 7, 5, 3)
Device outputs. Depending upon the state of the
output–enable pins, these outputs are either inverting
outputs or high–impedance outputs.


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