SN74LS147JDS [MOTOROLA]
LS SERIES, 9-BIT ENCODER, CDIP16, CERAMIC, DIP-16;
| 型号： | SN74LS147JDS |
| 厂家： | 
MOTOROLA |
| 描述： | LS SERIES, 9-BIT ENCODER, CDIP16, CERAMIC, DIP-16 运算电路 逻辑集成电路 光电二极管 编码器 |
| 文件： | 总7页 (文件大小：234K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54/74LS147
SN54/74LS148
SN54/74LS748
10-LINE-TO-4-LINE
AND 8-LINE-TO-3-LINE
PRIORITY ENCODERS
The SN54/74LS147 and the SN54/74LS148 are Priority Encoders. They
provide priority decoding of the inputs to ensure that only the highest order
data line is encoded. Both devices have data inputs and outputs which are
active at the low logic level.
The LS147 encodes nine data lines to four-line (8-4-2-1) BCD. The implied
decimal zero condition does not require an input condition because zero is
encoded when all nine data lines are at a high logic level.
10-LINE-TO-4-LINE
AND 8-LINE-TO-3-LINE
PRIORITY ENCODERS
LOW POWER SCHOTTKY
The LS148 encodes eight data lines to three-line (4-2-1) binary (octal). By
providing cascading circuitry (Enable Input EI and Enable Output EO) octal
expansion is allowed without needing external circuitry.
The SN54/74LS748 is a proprietary Motorola part incorporating a built-in
deglitcher network which minimizes glitches on the GS output. The glitch
occurs on the negative going transition of the EI input when data inputs 0–7
are at logical ones.
The only dc parameter differences between the LS148 and the LS748 are
that (1) Pin 10 (input 0) has a fan-in of 2 on the LS748 versus a fan-in of 1 on
the LS148; (2) Pins 1, 2, 3, 4, 11, 12 and 13 (inputs 1, 2, 3, 4, 5, 6, 7) have a
fan-in of 3 on the LS748 versus a fan-in of 2 on the LS148.
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
The only ac difference is that t
45 ns.
from EI to EO is changed from 40 to
PHL
16
SN54/74LS147
1
(TOP VIEW)
D SUFFIX
SOIC
CASE 751B-03
16
1
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
SN54/74LS148
SN54/74LS748
(TOP VIEW)
FAST AND LS TTL DATA
5-245
SN54/74LS147 • SN54/74LS148 • SN54/74LS748
SN54/74LS148
SN54/74LS147
SN54/74LS748
FUNCTION TABLE
FUNCTION TABLE
INPUTS
OUTPUTS
INPUTS
OUTPUTS
A2 A1 A0 GS EO
1
2
3
4
5
6
7
8
9
D
C
B
A
EI
0
1
2
3
4
5
6
7
H
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
L
H
X
X
X
X
X
L
H
H
H
H
X
X
X
X
L
H
H
H
H
H
X
X
X
L
H
H
H
H
H
H
X
X
L
H
H
H
H
H
H
H
X
L
H
H
H
H
H
H
H
H
L
H
L
L
H
H
H
H
H
H
H
H
H
H
L
L
L
H
H
H
L
H
L
H
L
H
L
H
L
H
L
L
L
L
L
L
L
L
L
X
H
X
X
X
X
X
X
X
L
X
H
X
X
X
X
X
X
L
X
H
X
X
X
X
X
L
X
H
X
X
X
X
L
H
H
H
X
H
X
X
X
L
H
H
H
H
X
H
X
X
L
H
H
H
H
H
X
H
X
L
H
H
H
H
H
H
X
H
L
H
H
H
H
H
H
H
H
H
L
L
L
H
H
L
H
H
L
H
L
H
L
H
L
H
H
L
L
L
L
L
L
L
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
H
H
L
L
H
H
H
H
L
L
H
L
L
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H = HIGH Logic Level, L = LOW Logic Level, X = Irrelevant
FUNCTIONAL BLOCK DIAGRAMS
SN54/74LS147
SN54/74LS148
FAST AND LS TTL DATA
5-246
SN54/74LS147 • SN54/74LS148 • SN54/74LS748
FUNCTIONAL BLOCK DIAGRAMS (continued)
SN54/74LS748
FAST AND LS TTL DATA
5-247
SN54/74LS147 • SN54/74LS148 • SN54/74LS748
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°C
I
I
Output Current — High
Output Current — Low
54, 74
–0.4
mA
mA
OH
54
74
4.0
8.0
OL
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Min
Typ
Max
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
54
74
0.7
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage
–0.65
3.5
–1.5
V
V
V
V
V
= MIN, I = –18 mA
IN
IK
CC
54
74
2.5
2.7
= MIN, I
OH
= MAX, V = V
IN
CC
IH
OH
or V per Truth Table
IL
3.5
V
V
= V
CC
MIN,
= V or V
IL IH
54, 74
74
0.25
0.35
0.4
0.5
V
V
I
= 4.0 mA
= 8.0 mA
CC
IN
OL
OL
V
OL
Output LOW Voltage
I
per Truth Table
Input HIGH Current
All Others
Input 0 (LS748)
Inputs 1–7 (LS148)
Inputs 1–7 (LS748)
20
40
40
60
µA
mA
mA
V
CC
V
CC
V
CC
= MAX, V = 2.7 V
IN
I
IH
All Others
0.1
0.2
0.2
0.3
Input 0 (LS748)
Inputs 1–7 (LS148)
Inputs 1–7 (LS748)
= MAX, V = 7.0 V
IN
Input LOW Current
All Others
Input 0 (LS748)
Inputs 1–7 (LS148)
Inputs 1–7 (LS748)
–0.4
–0.8
–0.8
–1.2
I
IL
= MAX, V = 0.4 V
IN
I
I
Short Circuit Current (Note 1)
–20
–100
17
mA
mA
V
V
V
= MAX
OS
CC
CC
CC
Power Supply Current Output HIGH
Output LOW
= MAX, All Inputs = 4.5 V
CCH
= MAX, Inputs 7 & E1 = GND
I
20
mA
CCL
All Other Inputs = 4.5 V
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
5-248
SN54/74LS147 • SN54/74LS148 • SN54/74LS748
AC CHARACTERISTICS (V
= 5.0 V, T = 25°C)
CC
A
SN54/74LS147
Limits
Typ
12
From
(Input)
To
(Output)
Symbol
Waveform
Unit
Test Conditions
Min
Max
18
t
t
t
t
PLH
In-phase
output
Any
Any
ns
12
18
PHL
PLH
PHL
C
L
L
= 15 pF,
R
= 2.0 kΩ
21
33
Out-of-phase
output
Any
Any
ns
15
23
SN54/74LS148
SN54/74LS748
Limits
Typ
14
From
(Input)
To
(Output)
Symbol
Waveform
Unit
Test Conditions
Min
Max
18
25
36
29
18
40
55
21
25
25
17
36
21
t
t
t
t
t
t
t
t
t
t
t
t
t
t
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
In-phase
output
1 thru 7
1 thru 7
0 thru 7
0 thru 7
EI
A0, A1, or A2
A0, A1, or A2
EO
ns
15
20
Out-of-phase
output
ns
ns
ns
ns
ns
16
7.0
25
Out-of-phase
output
C
R
= 15 pF,
= 2.0 kΩ
L
L
35
In-phase
output
GS
9.0
16
In-phase
output
A0, A1, or A2
GS
12
12
In-phase
output
EI
14
12
In-phase
output
EI
EO
ns
28
30
40
45
(LS148)
(LS748)
FAST AND LS TTL DATA
5-249
Case 751B-03 D Suffix
16-Pin Plastic
SO-16
-A-
16
1
9
8
P
C
-B-
R X 45°
G
-T-
J
M
F
D
°
°
°
°
K
Case 648-08 N Suffix
16-Pin Plastic
-A-
16
1
9
B
S
8
F
L
C
K
-T-
M
H
J
G
D
°
°
°
°
Case 620-09 J Suffix
16-Pin Ceramic Dual In-Line
-A-
16
9
-B-
1
8
L
C
-T-
K
M
N
E
J
F
G
D
°
°
°
°
FAST AND LS TTL DATA
5-250
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