Data Sheet

©2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
74AC240, 74ACT240 Rev. 1.2.0 2
74AC240, 74ACT240 — Octal Buffer/Line Driver with 3-STATE Outputs
Connection Diagram
Pin Description
Logic Symbol
IEEE/IEC
Truth Tables
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Pin Names Description
OE
1
, OE
2
3-STATE Output Enable Inputs
I
0
–I
7
Inputs
O
0
–O
7
Outputs
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OE
1
I
0
O
4
I
1
O
5
I
2
O
6
I
3
O
7
GND
V
CC
OE
2
O
0
I
4
O
1
I
5
O
2
I
6
O
3
I
7
Inputs
Outputs
(Pins 12, 14, 16, 18)OE
1
I
n
LL H
LH L
HX Z
Inputs
Outputs
(Pins 3, 5, 7, 9)OE
2
I
n
LL H
LH L
HX Z
O
0
OE
1
EN
I
0
O
1
I
1
O
2
I
2
O
3
I
3
O
4
I
4
O
5
I
5
O
6
I
6
O
7
I
7
OE
2
EN