MC54-74HC240A MOTOROLA [Motorola, Inc], MC54-74HC240A Datasheet - Page 4

• Manufacturer Part Number: MC54-74HC240A
• Description: Octal 3-State Inverting 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)
on the corresponding Y outputs, when the outputs are
enabled.
CONTROLS
Enable A, Enable B (Pins 1, 19)
MC54/74HC240A
Data input pins. Data on these pins appear in inverted form
Output enables (active–low). When a low level is applied
DATA INPUT
YA OR YB
OUTPUT
A OR B
* Includes all probe and jig capacitance
t PHL
t THL
DEVICE
UNDER
TEST
Figure 3. Test Circuit
10%
50%
90%
Figure 1.
90%
50%
t r
10%
OUTPUT
TEST POINT
C L *
t f
t PLH
SWITCHING WAVEFORMS
t TLH
PIN DESCRIPTIONS
V CC
GND
4
OUTPUT Y
OUTPUT Y
to these pins, the outputs are enabled and the devices func-
tion 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)
enable pins, these outputs are either inverting outputs or
high–impedance outputs.
ENABLE
Device outputs. Depending upon the state of the output–
DEVICE
UNDER
TEST
* Includes all probe and jig capacitance
50%
OUTPUT
50%
50%
Figure 4. Test Circuit
TEST POINT
t PZH
t PZL
Figure 2.
C L *
t PHZ
t PLZ
1 k
High–Speed CMOS Logic Data
CONNECT TO V CC WHEN
CONNECT TO GND WHEN
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