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參數(shù)資料
| 型號(hào)： | 74LS194 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | LOW POWER SCHOTTKY |
| 中文描述： | 低功耗肖特基 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大小： | 135K |
| 代理商： | 74LS194 |
SN74LS194A
http://onsemi.com
4
MODE SELECT — TRUTH TABLE
OPERATING MODE
INPUTS
OUTPUTS
Q
2
MR
S
1
X
S
0
X
D
SR
X
D
SL
X
P
n
X
Q
0
L
Q
1
L
Q
3
L
Reset
L
L
Hold
H
I
I
X
X
X
q
0
q
1
q
1
L
H
q
1
q
2
q
2
q
0
q
0
P
1
q
2
q
3
q
3
q
1
q
1
P
2
q
3
L
H
Shift Left
H
H
h
h
I
I
X
X
I
X
X
h
Shift Right
H
H
I
I
h
h
I
h
X
X
X
X
q
2
q
2
P
3
Parallel Load
L = LOW Voltage Level
H = HIGH Voltage Level
X = Don’t Care
I = LOW voltage level one set-up time prior to the LOW to HIGH clock transition
h = HIGH voltage level one set-up time prior to the LOW to HIGH clock transition
p
n
(q
n
) = Lower case letters indicate the state of the referenced input (or output) one set-up time prior to the LOW to HIGH clock transition.
H
h
h
X
X
P
n
P
0
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
V
IH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
V
IL
Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
V
IK
Input Clamp Diode Voltage
–0.65
–1.5
V
V
CC
= MIN, I
IN
= –18 mA
V
OH
Output HIGH Voltage
2.7
3.5
V
V
CC
= MIN, I
OH
= MAX, V
IN
= V
IH
or V
IL
per Truth Table
V
OL
Output LOW Voltage
0.25
0.4
V
I
OL
= 4.0 mA
V
CC
= V
CC
MIN,
V
IN
= V
IL
or V
IH
per Truth Table
0.35
0.5
V
I
OL
= 8.0 mA
I
IH
Input HIGH Current
20
μ
A
V
CC
= MAX, V
IN
= 2.7 V
0.1
mA
V
CC
= MAX, V
IN
= 7.0 V
I
IL
Input LOW Current
–0.4
mA
V
CC
= MAX, V
IN
= 0.4 V
I
OS
Short Circuit Current (Note 1)
–20
–100
mA
V
CC
= MAX
I
CC
Power Supply Current
23
mA
V
CC
= MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS
(T
A
= 25
°
C)
Limits
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
f
MAX
Maximum Clock Frequency
25
36
MHz
t
PLH
t
PHL
Propagation Delay,
Clock to Output
14
17
22
26
ns
V
CC
= 5.0 V
= 15 pF
C
L
15 F
t
PHL
Propagation Delay,
MR to Output
19
30
ns
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