54abt16374 National Semiconductor Corporation, 54abt16374 Datasheet - Page 2

• Manufacturer Part Number: 54abt16374
• Description: 16-bit D Flip-flop With Tri-state Outputs
• Manufacturer: National Semiconductor Corporation

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Functional Description
The ABT16374 consists of sixteen edge-triggered flip-flops
with individual D-type inputs and TRI-STATE true outputs.
The device is byte controlled with each byte functioning
identically, but independent of the other. The control pins can
be shorted together to obtain full 16-bit operation. Each byte
has a buffered clock and buffered Output Enable common to
all flip-flops within that byte. The description which follows
applies to each byte. Each flip-flop will store the state of their
individual D inputs that meet the setup and hold time require-
ments on the LOW-to-HIGH Clock (CP
Output Enable (OE
available at the outputs. When OE
to the high impedance state. Operation of the OE
does not affect the state of the flip-flops.
Logic Diagrams
n
) LOW, the contents of the flip-flops are
n
is HIGH, the outputs go
n
) transition. With the
n
input
Byte 2 (8:15)
Byte 1 (0:7)
2
Truth Tables
H = High Voltage Level
L = Low Voltage Level
X = Immaterial
Z = High Impedance
CP
CP
N
N
X
N
N
X
L
L
2
1
OE
Inputs
OE
Inputs
H
L
L
L
H
L
L
L
2
1
D
D
8
0
–D
H
H
L
X
X
–D
L
X
X
15
7
(Previous)
(Previous)
DS100224-3
DS100224-4
Outputs
Outputs
O
O
8
0
–O
H
–O
L
Z
H
L
Z
15
7