參數(shù)資料
型號(hào): 74HC194
廠商: NXP Semiconductors N.V.
英文描述: 4-bit bidirectional universal shift register
中文描述: 4位雙向通用移位寄存器
文件頁數(shù): 4/10頁
文件大小: 79K
代理商: 74HC194
December 1990
4
Philips Semiconductors
Product specification
4-bit bidirectional universal shift register
74HC/HCT194
FUNCTION TABLE
Notes
1.
H
h
L
I
q,d = lower case letters indicate the state of the referenced input (or output) one set-up time prior to the
LOW-to-HIGH CP transition
X
= don’t care
= LOW-to-HIGH CP transition
= HIGH voltage level
= HIGH voltage level one set-up time prior to the LOW-to-HIGH CP transition
= LOW voltage level
= LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition
OPERATING MODES
INPUTS
OUTPUTS
CP
MR
S
1
X
I
h
h
I
I
h
S
0
X
I
I
I
h
h
h
D
SR
X
X
X
X
I
h
X
D
SL
X
X
I
h
X
X
X
D
n
X
X
X
X
X
X
d
n
Q
0
L
q
0
q
1
q
1
L
H
d
0
Q
1
L
q
1
q
2
q
2
q
0
q
0
d
1
Q
2
L
q
2
q
3
q
3
q
1
q
1
d
2
Q
3
L
q
3
L
H
q
2
q
2
d
3
reset (clear)
hold (“do nothing”)
X
X
L
H
H
H
H
H
H
shift left
shift right
parallel load
Fig.4 Functional diagram.
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