MC74HC597A 查看數據表（PDF） - ON Semiconductor
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MC74HC597A
ON Semiconductor
MC74HC597A Datasheet PDF : 12 Pages
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MC74HC597A
FUNCTION TABLE
Inputs
Resulting Function
Operation
Reset shift register
Serial Shift/
Reset Parallel Load
L
X
Latch
Clock
L, H,
Shift
Clock
X
Serial
Input
SA
X
Parallel
Inputs
A−H
X
Latch
Contents
U
Shift
Register
Contents
L
Output
QH
L
Reset shift register; load
L
X
parallel data into data latch
X
X
a−h
a−h
L
L
Load parallel data into data H
H
latch
L,H,
X
a−h
a−h
U
U
Transfer latch contents to
H
shift register
L
L, H,
X
X
X
U
LRN → SRN
LRH
Contents of data latch and H
H
L, H, L,H,
X
X
U
U
U
shift register are
unchanged
Load parallel data into data H
L
latch and shift register
X
X
a−h
a−h
a−h
h
Shift serial data into shift
H
H
X
register
Load parallel data into data H
H
latch and shift serial data
into shift register
D
X
D
a−h
*
SRA = D;
SRG → SRH
SRN → SRN + 1
a−h
SRA = D;
SRG → SRH
SRN → SRN + 1
LR = latch register contents
SR = shift register contents
* = depends on latch clock input
a−h = data at parallel data inputs A−H
D = data (L, H) at serial data input SA
U = remains unchanged
X = don’t care
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