74ACT16373 Fairchild Semiconductor, 74ACT16373 Datasheet - Page 2

• Manufacturer Part Number: 74ACT16373
• Description: 16-Bit Transparent Latch with 3-STATE Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Functional Description
The ACT16373 contains sixteen D-type latches with 3-
STATE standard outputs. The device is byte controlled with
each byte functioning identically, but independent of the
other. Control pins can be shorted together to obtain full
16-bit operation. The following description applies to each
byte. When the Latch Enable (LE
the D
transparent, i.e., a latch output will change states each time
its D input changes. When LE
information that was present on the D inputs a setup time
preceding the HIGH-to-LOW transition of LE
STATE standard outputs are controlled by the Output
Enable (OE
puts are in the 2-state mode. When OE
dard outputs are in the high impedance mode but this does
not interfere with entering new data into the latches.
Logic Diagrams
n
enters the latches. In this condition the latches are
n
) input. When OE
n
n
is LOW, the standard out-
is LOW, the latches store
n
) input is HIGH, data on
n
is HIGH, the stan-
n
. The 3-
2
Truth Tables
H
L
X
Z
Previous
LOW Voltage Level
High Impedance
HIGH Voltage Level
Immaterial
LE
LE
X
H
H
X
H
H
L
L
2
1
previous output prior to HIGH-to-LOW transition of LE
OE
OE
Inputs
Inputs
H
L
L
L
H
L
L
L
2
1
I
I
8
0
–I
–I
X
H
X
X
H
X
L
L
15
7
(Previous)
(Previous)
Outputs
Outputs
O
O
0
8
–O
H
–O
Z
L
Z
L
H
7
15