SN74LS147N [ONSEMI]
LOW POWER SCHOTTKY; 小功率肖特基
| 型号： | SN74LS147N |
| 厂家： | 
ONSEMI |
| 描述： | LOW POWER SCHOTTKY |
| 文件： | 总8页 (文件大小：138K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
The SN74LS147 and the SN74LS148 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.
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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.
GUARANTEED OPERATING RANGES
16
Symbol
Parameter
Supply Voltage
Min
4.75
0
Typ
5.0
25
Max
5.25
70
Unit
V
1
V
CC
PLASTIC
N SUFFIX
CASE 648
T
A
Operating Ambient
Temperature Range
°C
I
Output Current – High
Output Current – Low
–0.4
8.0
mA
mA
OH
I
OL
16
1
SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device
Package
16 Pin DIP
16 Pin
Shipping
SN74LS147N
SN74LS147D
SN74LS148N
SN74LS148D
2000 Units/Box
2500/Tape & Reel
2000 Units/Box
16 Pin DIP
16 Pin
2500/Tape & Reel
Semiconductor Components Industries, LLC, 1999
1
Publication Order Number:
December, 1999 – Rev. 6
SN74LS147/D
SN74LS147 SN74LS148
SN74LS147
(TOP VIEW)
OUTPUT
INPUTS
OUTPUT
V
NC
15
D
3
2
1
9
A
9
CC
16
14
13
12
11
10
D
6
3
7
2
8
1
9
4
A
5
C
B
1
4
2
5
3
6
4
7
5
8
6
8
7
C
B
GND
INPUTS
OUTPUTS
SN74LS148
(TOP VIEW)
OUTPUTS
INPUTS
OUTPUT
V
EO GS
3
2
1
0
A0
9
CC
16
15
14
13
12
11
10
EO GS
3
7
2
1
0
4
A0
5
6
EI
A2
A1
1
4
2
5
3
6
4
7
5
6
8
7
E1
A2
A1 GND
INPUTS
OUTPUTS
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2
SN74LS147 SN74LS148
SN74LS147
SN74LS148
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
(11)
(12)
(10)
0
1
2
3
(15)
(14)
EO
GS
(11)
(9)
1
A
(13)
(12)
2
(8)
(7)
(6)
A0
A1
A2
(1)
(2)
(13)
3
4
5
(7)
B
(1)
(2)
(3)
4
5
6
7
(3)
6
7
8
9
(4)
(6)
C
D
(5)
(4)
(5)
(14)
(10)
EI
SN74LS147
SN74LS148
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3
SN74LS147 SN74LS148
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
IH
2.0
V
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
IL
Input LOW Voltage
V
V
V
Input Clamp Diode Voltage
Output HIGH Voltage
–0.65
3.5
–1.5
V
V
V
V
= MIN, I = –18 mA
IN
IK
CC
2.7
= MIN, I = MAX, V = V
OH IN IH
OH
CC
or V per Truth Table
IL
V
V
= V MIN,
CC
0.25
0.35
0.4
0.5
V
V
I
= 4.0 mA
= 8.0 mA
CC
OL
OL
= V or V
IH
V
OL
Output LOW Voltage
IN
IL
I
per Truth Table
Input HIGH Current
All Others
Inputs 1–7 (LS148)
20
40
µA
mA
mA
V
CC
V
CC
V
CC
= MAX, V = 2.7 V
IN
I
I
IH
All Others
Inputs 1–7 (LS148)
0.1
0.2
= MAX, V = 7.0 V
IN
Input LOW Current
All Others
Inputs 1–7 (LS148)
–0.4
–0.8
= MAX, V = 0.4 V
IL
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
= MAX, All Inputs = 4.5 V
= MAX, Inputs 7 & E1 = GND
CCH
I
Output LOW
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.
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4
SN74LS147 SN74LS148
AC CHARACTERISTICS (V = 5.0 V, T = 25°C)
CC
A
SN74LS147
Limits
From
To
(Input)
(Output)
Symbol
Waveform
Unit
Test Conditions
Min
Typ
12
Max
18
t
t
t
t
PLH
PHL
PLH
PHL
In-phase
output
Any
Any
Any
ns
12
18
C = 15 pF,
L
R = 2.0 kΩ
L
21
33
Out-of-phase
output
Any
ns
15
23
SN74LS148
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
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 = 15 pF,
L
35
In-phase
output
R = 2.0 kΩ
L
GS
9.0
16
In-phase
output
A0, A1, or A2
GS
12
12
In-phase
output
EI
14
12
PLH
PHL
In-phase
output
EI
EO
ns
28
30
40
45
(LS148)
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5
SN74LS147 SN74LS148
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
ISSUE R
NOTES:
–A–
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
16
1
9
8
B
S
INCHES
DIM MIN MAX
0.740 0.770 18.80 19.55
MILLIMETERS
MIN MAX
F
A
B
C
D
F
C
L
0.250 0.270
0.145 0.175
0.015 0.021
6.35
3.69
0.39
1.02
6.85
4.44
0.53
1.77
0.040
0.70
SEATING
–T–
G
H
J
K
L
M
S
0.100 BSC
0.050 BSC
0.008 0.015
2.54 BSC
1.27 BSC
PLANE
K
M
0.21
0.38
3.30
7.74
10
H
J
0.110
0.295 0.305
10
0.020 0.040
0.130
2.80
7.50
0
G
D 16 PL
0
0.51
1.01
M
M
0.25 (0.010)
T A
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6
SN74LS147 SN74LS148
PACKAGE DIMENSIONS
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B–05
ISSUE J
–A–
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
16
1
9
8
–B–
P 8 PL
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
M
S
0.25 (0.010)
B
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
G
MILLIMETERS
DIM MIN MAX
INCHES
MIN
MAX
0.393
0.157
0.068
0.019
0.049
F
A
B
C
D
F
9.80
3.80
1.35
0.35
0.40
10.00 0.386
4.00 0.150
1.75 0.054
0.49 0.014
1.25 0.016
R X 45
K
C
G
J
K
M
P
1.27 BSC
0.050 BSC
–T–
SEATING
PLANE
0.19
0.10
0
0.25 0.008
0.25 0.004
0.009
0.009
7
J
M
D
16 PL
7
0
5.80
0.25
6.20 0.229
0.50 0.010
0.244
0.019
M
S
S
0.25 (0.010)
T B
A
R
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7
SN74LS147 SN74LS148
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SN74LS147/D
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