MC74AC564 Datasheet, PDF (2/9 Pages) Motorola, Inc – OCTAL D-TYPE LATCH WITH 3-STATE OUTPUTS

MC74AC564 MC74ACT564
FUNCTIONAL DESCRIPTION
The MC74AC564/74ACT564 consists of eight edge-
triggered flip-flops with individual D-type inputs and
3-state complementary 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 times 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.
FUNCTION TABLE
Inputs
OE CP D
Internal Outputs
Q
O
Function
H
H
L
NC
H
H
H
NC
H
L
H
H
H
L
L
L
H
L
H
L
L
H
L
NC
L
H
H
NC
Z
Hold
Z
Hold
Z
Load
Z
Load
H Data Available
L
Data Available
NC No Change in Data
NC No Change in Data
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
= LOW-to-HIGH Transition
NC = No Change
D₀
D₁
D₂
D₃
D₄
D₅
D₆
D₇
CP
CD
Q
CD
Q
CD
Q
CD
Q
CD
Q
CD
Q
CD
Q
CD
Q
OE
O₀
O₁
O₂
O₃
O₄
O₅
O₆
O₇
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
Figure 3. Logic Diagram
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