MC54-74HC244A MOTOROLA [Motorola, Inc], MC54-74HC244A Datasheet - Page 4

• Manufacturer Part Number: MC54-74HC244A
• Description: Octal 3-State Noninverting Buffer/Line Driver/Line Receiver
• Manufacturer: MOTOROLA [Motorola, Inc]

MOTOROLA
INPUTS
A1, A2, A3, A4, B1, B2, B3, B4
(Pins 2, 4, 6, 8, 11, 13, 15, 17)
form on the corresponding Y outputs, when the outputs are
enabled.
CONTROLS
Enable A, Enable B (Pins 1, 19)
MC54/74HC244A
DATA INPUT
Data input pins. Data on these pins appear in noninverted
Output enables (active–low). When a low level is applied
YA OR YB
OUTPUT
A OR B
* Includes all probe and jig capacitance
t PLH
DEVICE
UNDER
TEST
t r
Figure 3. Test Circuit
t TLH
10%
10%
50%
50%
90%
90%
OUTPUT
Figure 1.
TEST POINT
C L *
t f
t PHL
t THL
SWITCHING WAVEFORMS
V CC
GND
PIN DESCRIPTIONS
TEST CIRCUITS
4
DEVICE
UNDER
TEST
to these pins, the outputs are enabled and the devices func-
tion 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)
enable pins, these outputs are either noninverting outputs or
high–impedance outputs.
OUTPUT Y
OUTPUT Y
ENABLE
Device outputs. Depending upon the state of the output–
A OR B
* Includes all probe and jig capacitance
OUTPUT
50%
TEST POINT
Figure 4. Test Circuit
50%
50%
t PZL
t PZH
C L *
1 k
Figure 2.
t PHZ
t PLZ
CONNECT TO GND WHEN
CONNECT TO V CC WHEN
High–Speed CMOS Logic Data
TESTING t PLZ AND t PZL .
TESTING t PHZ AND t PZH .
10%
90%
DL129 — Rev 6
V CC
GND
HIGH
IMPEDANCE
V OL
V OH
HIGH
IMPEDANCE