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參數(shù)資料
| 型號(hào)： | 74LS194A |
| 廠商： | National Semiconductor Corporation |
| 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)： | 3/8頁(yè) |
| 文件大小： | 166K |
| 代理商： | 74LS194A |
Switching Characteristics
at V
CC
e
5V and T
A
e
25
§
C (See Section 1 for Test Waveforms and Output Load)
From (Input)
54LS
DM74LS
Symbol
Parameter
To (Output)
C
L
e
15 pF
C
L
e
50 pF
R
L
e
2 k
X
Units
Min
Max
Min
Max
f
MAX
Maximum Clock
Frequency
30
20
MHz
t
PLH
Propagation Delay Time
Low to High Level Output
Clock to
Any Q
21
26
ns
t
PHL
Propagation Delay Time
High to Low Level Output
Clock to
Any Q
24
35
ns
t
PHL
Propagation Delay Time
High to Low Output
Clear to
Any Q
26
38
ns
Note 1:
All typicals are at V
CC
e
5V, T
A
e
25
§
C.
Note 2:
Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 3:
With all outputs open, inputs A through D grounded, and 4.5V applied to S0, S1, CLEAR, and the serial inputs, I
CC
is tested with momentary ground, then
4.5V applied to CLOCK.
Logic Diagram
LS194A
TL/F/6407–2
Function Table
Inputs
Outputs
Clear
Mode
Clock
Serial
Parallel
Q
A
Q
B
Q
C
Q
D
S1
S0
Left
Right
A
B
C
D
L
H
H
H
H
H
H
H
X
X
H
L
L
H
H
L
X
X
H
H
H
L
L
L
X
L
u
u
u
u
u
X
X
X
X
X
X
H
L
X
X
X
X
H
L
X
X
X
X
X
a
X
X
X
X
X
X
X
b
X
X
X
X
X
X
X
c
X
X
X
X
X
X
X
d
X
X
X
X
X
L
L
L
L
Q
A0
a
H
L
Q
Bn
Q
Bn
Q
A0
Q
B0
b
Q
An
Q
An
Q
Cn
Q
Cn
Q
B0
Q
C0
c
Q
Bn
Q
Bn
Q
Dn
Q
Dn
Q
C0
Q
D0
d
Q
Cn
Q
Cn
H
L
Q
D0
H
e
High Level (steady state), L
e
Low Level (steady state), X
e
Don’t Care (any input, including transitions)
u
e
Transition from low to high level
a, b, c, d
e
The level of steady state input at inputs A, B, C or D, respectively.
Q
A0
, Q
B0
, Q
C0
, Q
D0
e
The level of Q
A
, Q
B
, Q
C
, or Q
D
, respectively, before the indicated steady state input conditions were established.
Q
An
, Q
Bn
, Q
Cn
, Q
Dn
e
The level of Q
A
, Q
B
, Q
C
, respectively, before the most-recent
u
transition of the clock.
3
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|---|---|
| 74LS194ADC | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| 74LS194DC | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 74LS194PC | 制造商:Texas Instruments 功能描述: |
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