MC74AC564 Datasheet, PDF (2/8 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
LOGIC DIAGRAM
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.
FACT DATA
5-2