MC74LCX245
V
CC
20
OE
19
B0
18
B1
17
B2
16
B3
15
B4
14
B5
13
B6
12
B7
11
OE 19
T/R 1
2
18
A0
B0
1
T/R
2
A0
3
A1
4
A2
5
A3
6
A4
7
A5
8
A6
9
A7
10
GND
A1
3
17
B1
Figure 1. Pinout
(Top View)
A2
4
16
B2
PIN NAMES
PINS
OE
T/R
A0−A7
B0−B7
FUNCTION
Output Enable Input
Transmit/Receive Input
Side A 3−State Inputs or 3−State Outputs
Side B 3−State Inputs or 3−StateOutputs
A3
5
15
B3
A4
6
14
B4
A5
7
13
B5
TRUTH TABLE
INPUTS
OE
L
L
H
T/R
L
H
X
OPERATING MODE
Non−Inverting
B Data to A Bus
A Data to B Bus
Z
A6
8
12
B6
A7
9
11
B7
H = High Voltage Level
L = Low Voltage Level
Z = High Impedance State
X = High or Low Voltage Level and Transitions are Acceptable
For I
CC
reasons, Do Not Float Inputs
Figure 2. Logic Diagram
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2