74ACT18825 Fairchild Semiconductor, 74ACT18825 Datasheet - Page 2

• Manufacturer Part Number: 74ACT18825
• Description: 18-Bit Buffer/Line Driver with 3-STATE Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Functional Description
The ACT18825 contains eighteen non-inverting buffers
with 3-STATE standard outputs. The device is byte con-
trolled with each byte functioning identically, but indepen-
dently of the other. The control pins may be shorted
together to obtain full 8-bit operation. The 3-STATE outputs
are controlled by an Output Enable (OE
byte. When OE
When OE
mode, but this does not interfere with entering new data
into the inputs.
Logic Diagram
n
is HIGH, the outputs are in the high impedance
n
is LOW, the outputs are in 2-state mode.
n
) input for each
2
Truth Table
H
L
X
Z
Byte 1 (0:8) Byte 2 (8:17)
OE
H
X
H
L
L
L
L
LOW Voltage Level
HIGH Impedance
HIGH Voltage Level
Immaterial
1
OE
X
H
H
L
L
L
L
2
OE
H
H
L
L
L
X
L
Inputs
3
OE
X
H
H
L
L
L
L
4
I
0
H
H
–I
X
X
L
X
L
8
I
9
–I
H
H
X
X
X
L
L
17
O
0
H
H
–O
Z
Z
L
Z
L
Outputs
8
O
9
–O
H
H
Z
Z
Z
L
L
17