MC74AC57 MOTOROLA [Motorola, Inc], MC74AC57 Datasheet - Page 2

• Manufacturer Part Number: MC74AC57
• Description: OCTAL D-TYPE FLIP-FLOP WITH 3-STATE OUTPUTS
• Manufacturer: MOTOROLA [Motorola, Inc]

FUNCTIONAL DESCRIPTION
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. Operation of the OE
input does not affect the state of the flip-flops.
CP
OE
The MC74AC574/74ACT574 consists of eight edge-
O 0
C
Q
D 0
D
O 1
C
Q
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
D 1
D
MC74AC57 MC74ACT574
O 2
C
Q
D 2
D
LOGIC DIAGRAM
FACT DATA
O 3
C
Q
5-2
D 3
D
FUNCTION TABLE
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
NC = No Change
OE
H
H
H
H
L
L
L
L
= LOW-to-HIGH Clock Transition
O 4
C
Q
Inputs
CP
H
H
H
H
D 4
D
D
H
H
H
H
L
L
L
L
O 5
C
Q
Internal
NC
NC
NC
NC
Q
H
H
L
L
D 5
D
Outputs
NC
NC
O n
Z
Z
Z
Z
H
L
O 6
C
Q
Hold
Hold
Load
Load
Data Available
Data Available
No Change in Data
No Change in Data
D 6
D
Function
Function
O 7
Q
C
D 7
D