SN74LS47N [ONSEMI]
BCD to 7-Segment Decoder/Driver; BCD到7段解码器/驱动器
| 型号： | SN74LS47N |
| 厂家： | 
ONSEMI |
| 描述： | BCD to 7-Segment Decoder/Driver |
| 文件： | 总8页 (文件大小：136K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
The SN74LS47 are Low Power Schottky BCD to 7-Segment
Decoder/Drivers consisting of NAND gates, input buffers and seven
AND-OR-INVERT gates. They offer active LOW, high sink current
outputs for driving indicators directly. Seven NAND gates and one
driver are connected in pairs to make BCD data and its complement
available to the seven decoding AND-OR-INVERT gates. The
remaining NAND gate and three input buffers provide lamp test,
blanking input/ripple-blanking output and ripple-blanking input.
The circuits accept 4-bit binary-coded-decimal (BCD) and,
depending on the state of the auxiliary inputs, decodes this data to
drive a 7-segment display indicator. The relative positive-logic output
levels, as well as conditions required at the auxiliary inputs, are shown
in the truth tables. Output configurations of the SN74LS47 are
designed to withstand the relatively high voltages required for
7-segment indicators.
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LOW
POWER
SCHOTTKY
These outputs will withstand 15 V with a maximum reverse current
of 250 µA. Indicator segments requiring up to 24 mA of current may
be driven directly from the SN74LS47 high performance output
transistors. Display patterns for BCD input counts above nine are
unique symbols to authenticate input conditions.
16
1
PLASTIC
N SUFFIX
CASE 648
The SN74LS47 incorporates automatic leading and/or trailing-edge
zero-blanking control (RBI and RBO). Lamp test (LT) may be
performed at any time which the BI/RBO node is a HIGH level. This
device also contains an overriding blanking input (BI) which can be
used to control the lamp intensity by varying the frequency and duty
cycle of the BI input signal or to inhibit the outputs.
• Lamp Intensity Modulation Capability (BI/RBO)
• Open Collector Outputs
• Lamp Test Provision
16
1
SOIC
D SUFFIX
CASE 751B
• Leading/Trailing Zero Suppression
• Input Clamp Diodes Limit High-Speed Termination Effects
GUARANTEED OPERATING RANGES
Symbol
Parameter
Supply Voltage
Min
4.75
0
Typ
5.0
25
Max
5.25
70
Unit
V
ORDERING INFORMATION
V
CC
Device
Package
16 Pin DIP
16 Pin
Shipping
T
A
Operating Ambient
Temperature Range
°C
SN74LS47N
SN74LS47D
2000 Units/Box
2500/Tape & Reel
I
Output Current – High
BI/RBO
–50
3.2
A
OH
I
OL
Output Current – Low
BI/RBO
mA
BI/RBO
V
Off–State Output Voltage
a to g
15
24
V
O(off)
I
On–State Output Current
a to g
mA
O(on)
Semiconductor Components Industries, LLC, 1999
1
Publication Order Number:
December, 1999 – Rev. 6
SN74LS47/D
SN74LS47
CONNECTION DIAGRAM DIP (TOP VIEW)
V
CC
f
g
a
b
c
d
e
16
15
14
13
12
11
10
9
1
2
3
4
5
6
8
7
B
C
LT BI/RBO RBI
D
A
GND
LOADING (Note a)
HIGH
LOW
PIN NAMES
A, B, C, D
RBI
LT
BCD Inputs
0.5 U.L.
0.5 U.L.
0.5 U.L.
0.5 U.L.
1.2 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
0.75 U.L.
2.0 U.L.
15 U.L.
Ripple–Blanking Input
Lamp–Test Input
Blanking Input or
Ripple–Blanking Output
Outputs
BI/RBO
a, to g
Open–Collector
NOTES:
a) 1 Unit Load (U.L.) = 40 A HIGH, 1.6 mA LOW.
b) Output current measured at V = 0.5 V
OUT
b) The Output LOW drive factor is 15 U.L. for Commercial (74) Temperature Ranges.
LOGIC SYMBOL
7
1 2 6 3 5
A B C D LT RBI
BI/
RBO
a
b
c
d
e
f g
13 12 11 10 9 15 14
= PIN 16
4
V
CC
GND = PIN 8
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2
SN74LS47
LOGIC DIAGRAM
a
a
A
B
b
b
INPUT
C
D
c
d
e
c
d
e
OUTPUT
BLANKING INPUT OR
RIPPLE-BLANKING
OUTPUT
f
f
LAMP-TEST INPUT
RIPPLE-BLANKING
INPUT
g
g
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
NUMERICAL DESIGNATIONS — RESULTANT DISPLAYS
TRUTH TABLE
INPUTS
OUTPUTS
DECIMAL
OR
LT
RBI
D
C
B
A
BI/RBO
a
b
c
d
e
f
g
NOTE
FUNCTION
0
1
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
X
H
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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
L
L
L
L
L
L
H
L
L
H
L
L
H
H
H
L
H
H
L
L
L
L
L
H
L
L
L
L
L
L
L
H
H
H
L
A
A
2
L
L
H
H
L
L
H
L
3
L
L
H
L
L
L
L
H
H
H
L
4
L
H
H
H
H
L
H
L
L
L
H
L
5
L
L
H
L
H
H
L
L
L
6
L
H
H
L
H
L
L
L
L
7
L
H
L
L
H
L
H
L
H
L
8
H
H
H
H
H
H
H
H
X
L
L
L
L
9
L
L
H
L
L
L
L
H
L
H
L
L
10
11
12
13
14
15
BI
RBI
LT
L
H
H
L
H
H
H
L
H
H
L
H
L
H
H
L
L
H
L
L
H
H
H
L
H
H
H
H
X
L
H
H
H
H
H
H
L
H
L
L
H
L
H
H
H
H
H
L
L
H
H
X
L
H
H
H
H
L
L
L
H
X
L
H
H
H
L
H
H
H
L
H
H
H
L
B
C
D
L
X
X
X
X
X
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
NOTES:
(A) BI/RBO is wire-AND logic serving as blanking Input (BI) and/or ripple-blanking output (RBO). The blanking out (BI) must be open or
held at a HIGH level when output functions 0 through 15 are desired, and ripple-blanking input (RBI) must be open or at a HIGH level
if blanking of a decimal 0 is not desired. X = input may be HIGH or LOW.
(B) When a LOW level is applied to the blanking input (forced condition) all segment outputs go to a LOW level regardless of the state
of any other input condition.
(C)Whenripple-blankinginput(RBI)andinputsA, B, C, andDareatLOWlevel, withthelamptestinputatHIGHlevel, allsegmentoutputs
go to a HIGH level and the ripple-blanking output (RBO) goes to a LOW level (response condition).
(D)Whentheblankinginput/ripple-blankingoutput(BI/RBO) is open or held at a HIGH level, and a LOW level is applied to lamp test input,
all segment outputs go to a LOW level.
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3
SN74LS47
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Min
Typ
Max
Guaranteed Input HIGH Theshold Voltage
for All Inputs
V
2.0
V
IH
0.8
Guaranteed Input LOW Threshold Voltage
for All Inputs
V
V
V
Input LOW Voltage
V
V
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage, BI/RBO
–0.65
4.2
–1.5
V
CC
= MIN, I = –18 mA
IN
IK
V
V
= MIN, I = –50 µA,
OH
CC
2.4
OH
= V or V per Truth Table
IN
IN
IL
0.25
0.35
0.4
0.5
V
V
I
= 1.6 mA
= 3.2 mA
Output LOW Voltage
BI/RBO
V
= MIN, V = V
OL
CC IN IN
V
OL
or V per Truth Table
IL
I
OL
Off-State Output Current
a thru g
V
= MAX, V = V or V per Truth
CC
IN
IN
IL
I
250
µA
O (off)
Table, V
= 15 V
O (off)
V
= MAX, V = V
0.25
0.35
0.4
0.5
20
V
V
I
I
= 12 mA
= 24 mA
On-State Output Voltage
a thru g
CC
IN
IH
O (on)
V
O (on)
or V per Truth Table
IL
O (on)
µA
mA
V
V
= MAX, V = 2.7 V
IN
CC
I
I
Input HIGH Current
IH
0.1
= MAX, V = 7.0 V
IN
CC
Input LOW Current BI/RBO
Any Input except BI/RBO
–1.2
–0.4
mA
V
= MAX, V = 0.4 V
IL
CC IN
I
I
BI/RBO Output Short Circuit Current (Note 1)
Power Supply Current
–0.3
–2.0
13
mA
mA
V
V
= MAX, V
= MAX
= 0 V
OUT
OS
CC
7.0
CC
CC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (T = 25°C)
A
Limits
Symbol
Parameter
Unit
Test Conditions
Min
Typ
Max
t
t
Propagation Delay, Address
Input to Segment Output
100
100
ns
ns
PHL
PLH
V
CC
= 5.0 V
C = 15 pF
L
t
t
Propagation Delay, RBI Input
To Segment Output
100
100
ns
ns
PHL
PLH
AC WAVEFORMS
V
IN
1.3 V
1.3 V
1.3 V
1.3 V
V
IN
t
t
PLH
t
PHL
t
PLH
PHL
V
OUT
1.3 V
1.3 V
1.3 V
1.3 V
V
OUT
Figure 1.
Figure 2.
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4
SN74LS47
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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5
SN74LS47
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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6
SN74LS47
Notes
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7
SN74LS47
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SN74LS47/D
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