74LCX574 Fairchild Semiconductor, 74LCX574 Datasheet - Page 2

• Manufacturer Part Number: 74LCX574
• Description: Low Voltage Octal D-Type Flip-Flop with 5V Tolerant Inputs and Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Functional Description
The LCX574 consists of eight edge-triggered flip-flops with
individual D-type inputs and 3-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
individual D inputs that meet the setup and hold time
requirements 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 go to the high impedance state. Opera-
tion of the OE input does not affect the state of the flip-
flops.
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.
2
Truth Table
H
L
X

Z
NC
OE CP D
H
H
H
H
L
L
L
L
LOW Voltage Level
High Impedance
HIGH Voltage Level
Immaterial
LOW-to-HIGH Transition
No Change
Inputs




H
H
H
H
H
H
H
H
L
L
L
L
Internal
NC
NC
NC
NC
Q
H
H
L
L
Outputs
NC
NC
O
H
Z
Z
Z
Z
L
n
Hold
Hold
Load
Load
Data Available
Data Available
No Change in Data
No Change in Data
Function