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MC74HC589AF View Datasheet(PDF) - ON Semiconductor

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MC74HC589AF Datasheet PDF : 14 Pages
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MC74HC589A
FUNCTION TABLE
Inputs
Operation
Output Serial Shift/ Latch
Enable Parallel Load Clock
Force Output into High
H
X
X
Impedance State
Load Parallel Data into Data L
H
Latch
Transfer Latch Contents to
L
Shift Register
L
L, H,
Contents of Input Latch and
L
Shift Register are Unchanged
H
L, H,
Load Parallel Data into Data L
L
Latch and Shift Register
Shift Serial Data into Shift
L
H
X
Register
Load Parallel Data in Data
L
H
Latch and Shift Serial Data
into Shift Register
LR =
SR =
ah =
D=
latch register contents
shift register contents
data at parallel data inputs AH
data (L, H) at serial data input SA
Shift
Clock
X
L, H,
X
L, H,
X
Serial
Input
SA
X
Parallel
Inputs
AH
X
Resulting Function
Data
Latch
Contents
Shift
Register
Contents
Output
QH
X
X
Z
X
ah
ah
U
U
X
X
X
X
U
LRN SRN
LRH
U
U
U
X
ah
ah
ah
h
D
X
D
ah
*
SRA = D, SRG SRH
SRN SRN+1
ah
SRA = D, SRG SRH
SRN SRN+1
U = remains unchanged
X = don’t care
Z = high impedance
* = depends on Latch Clock input
Switching Waveforms
tr
tf
LATCH
CLOCK
90%
50%
10%
tw
tPLH
tPHL
QH
90%
50%
10%
tTLH
tTHL
VCC
GND
SHIFT
CLOCK
tw
50%
1/fmax
QH 50%
tPLH
tPHL
VCC
GND
Figure 3. (Serial Shift/Parallel Load = L)
Figure 4. (Serial Shift/Parallel Load = H)
OUTPUT
ENABLE
QH
QH
50%
tPZL tPLZ
50%
tPZH tPHZ
50%
Figure 5.
10%
90%
VCC
GND
HIGH
IMPEDANCE
VOL
VOH
HIGH
IMPEDANCE
SERIAL SHIFT/
PARALLEL LOAD
tw
50%
tPLH
QH
50%
Figure 6.
50%
tPHL
http://onsemi.com
7
VCC
GND
 

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