54abt374 National Semiconductor Corporation, 54abt374 Datasheet - Page 2

• Manufacturer Part Number: 54abt374
• Description: Octal D-type Flip-flop With Tri-state Outputs
• Manufacturer: National Semiconductor Corporation

www.national.com
Pin Descriptions
Function Table
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
D
CP
OE
O
Names
0
0
Pin
–D
–O
7
7
Data Inputs
Clock Pulse Input (Active
Rising Edge)
TRI-STATE Output Enable
Input (Active LOW)
TRI-STATE Outputs
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
N
NC = No Change
Description
OE
H
H
H
H
= LOW-to-HIGH Transition
L
L
L
L
Inputs
CP
N
N
N
N
H
H
H
H
D
H
H
H
H
L
L
L
L
Internal
NC
NC
NC
NC
Q
H
H
L
L
2
Outputs
NC
NC
O
H
Z
Z
Z
Z
L
Functional Description
The ’ABT374 consists of eight edge-triggered flip-flops with
individual D-type inputs and TRI-STATE true outputs. The
buffered clock and buffered Output Enable are common to all
flip-flops. The eight flip-flops will store the state of their indi-
vidual D inputs that meet the setup and hold time require-
ments on the LOW-to-HIGH Clock (CP) transition. With the
Output Enable (OE) LOW, the contents of the eight flip-flops
are available at the outputs. When OE is HIGH, the outputs
are in a high impedance state. Operation of the OE input
does not affect the state of the flip-flops.
Hold
Hold
Load
Load
Data Available
Data Available
No Change in Data
No Change in Data
Function
DS100207-3