參數(shù)資料
型號(hào): HD74HC194
廠商: Hitachi,Ltd.
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(yè)數(shù): 2/8頁(yè)
文件大?。?/td> 49K
代理商: HD74HC194
HD74HC194
2
Function Table
Inputs
Operating
Mode
Serial
Parallel
Outputs
Mode
Clear S
1
L
S
0
X
Clock
Shift Left
Shift Right
A B
C D Q
A
X X L
Q
B
L
Q
C
L
Q
D
L
Clear
X
X
X
X
X X
Parallel load
H
H
H
X
X
a
b
c
d
a
b
c
d
Shift right
H
L
H
X
H
X X
X X H
Q
An
Q
Bn
Q
Cn
H
L
H
X
L
X X
X X L
Q
An
Q
Bn
Q
Cn
Shift left
H
H
L
H
X
X X
X X Q
Bn
Q
Cn
Q
Dn
H
H
H
L
L
X
X X
X X Q
Bn
Q
Cn
Q
Dn
L
Hold
H
L
L
X
X
X
X X
X X Q
A0
X X Q
A0
X X Q
A0
Q
B0
Q
B0
Q
B0
Q
C0
Q
C0
Q
C0
Q
D0
Q
D0
Q
D0
H
X
X
L
X
X
X X
H
X
X
H
X
X
X X
H :
L
X :
high level (Steady state)
low level (Steady state)
don’t care
:
transition from low to high level.
a, b, c, d
:
the level of steady-state input at inputs A, B, C or D respectively.
Q
A0
, Q
B0
, Q
C0
, Q
D0
:
the level of Q
, Q
, Q
or Q
D
respectively, before the indicated steady-state input
conditions were established.
Q
An
, Q
Bn
, Q
Cn
, Q
Dn
:
the level of Q
A
, Q
B
, Q
C
or Q
D
respectively before the most recent
the clock.
:
transition of
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