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74HC244 Datasheet(PDF) 5 Page - ON Semiconductor

Part No. 74HC244
Description  Octal 3−State Noninverting Buffer/Line Driver/Line Receiver
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

74HC244 Datasheet(HTML) 5 Page - ON Semiconductor

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74HC244
http://onsemi.com
5
TEST CIRCUITS
*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 kW
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 noninverted
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 noninverting buffers. 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 noninverting
outputs or high−impedance outputs.
LOGIC DETAIL
DATA
INPUT
A OR B
ENABLE A OR
ENABLE B
TO THREE OTHER
A OR B INVERTERS
ONE OF 8
INVERTERS
YA
OR
YB
VCC


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