74ACT18825MTD Просмотр технического описания (PDF) - Fairchild Semiconductor
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74ACT18825MTD Datasheet PDF : 6 Pages
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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 (OEn) input for each
byte. When OEn is LOW, the outputs are in 2-state mode.
When OEn is HIGH, the outputs are in the high impedance
mode, but this does not interfere with entering new data
into the inputs.
Truth Table
Inputs
Outputs
Byte 1 (0:8) Byte 2 (8:17)
I0–I8 I9–I17 O0–O8 O9–O17
OE1 OE2 OE3 OE4
LL
L
L
HH
H
H
HX L
L
XL
Z
L
XH L
L
XH
Z
H
LL
H
X
L
X
L
Z
L
L
X
H
H
X
H
Z
HH
H
H
X
X
Z
Z
LL
L
L
L
L
L
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = HIGH Impedance
Logic Diagram
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