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SN74LS47
BCD to 7-Segment
Decoder/Driver
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.
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.
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 T est Provision
• Leading/Trailing Zero Suppression
• Input Clamp Diodes Limit High-Speed T ermination Effects
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LOW
POWER
SCHOTTKY
16
1
PLASTIC
N SUFFIX
CASE 648
16
1
SOIC
D SUFFIX
CASE 751B
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
CC
T
I
OH
I
OL
V
O(off)
I
O(on)
Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
Supply Voltage 4.75 5.0 5.25 V
Operating Ambient
A
T emperature Range
Output Current – High
BI/RBO
Output Current – Low
BI/RBO
BI/RBO
Off–State Output Voltage
a to g
On–State Output Current
a to g
0 25 70 °C
–50
3.2 mA
15 V
24 mA
1 Publication Order Number:
ORDERING INFORMATION
Device Package Shipping
SN74LS47N 16 Pin DIP 2000 Units/Box
m
A
SN74LS47D 16 Pin
2500/Tape & Reel
SN74LS47/D
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SN74LS47
CONNECTION DIAGRAM DIP (TOP VIEW)
f
V
CC
16 15
g a b c d e
14 13 12 11 10 9
123456
BCLTBI/RBO RBI D A GND
PIN NAMES
A, B, C, D
RBI
LT
BI/RBO
a, to g
NOTES:
a) 1 Unit Load (U.L.) = 40 mA HIGH, 1.6 mA LOW.
b) Output current measured at V
b) The Output LOW drive factor is 15 U.L. for Commercial (74) Temperature Ranges.
BCD Inputs
Ripple–Blanking Input
Lamp–Test Input
Blanking Input or
Ripple–Blanking Output
Outputs
= 0.5 V
OUT
Open–Collector
8
7
(Note a)LOADING
HIGH LOW
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.
LOGIC SYMBOL
712635
A B C D LT RBI
abcdefg
13 12 11 10 9 15 14 4
V
= PIN 16
CC
GND = PIN 8
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BI/
RBO
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LOGIC DIAGRAM
INPUT
BLANKING INPUT OR
RIPPLE-BLANKING
OUTPUT
LAMP-TEST INPUT
RIPPLE-BLANKING
INPUT
SN74LS47
aa
A
B
C
D
bb
cc
OUTPUT
dd
ee
ff
gg
0 1 2 3 4 5 6 7 8 9 10 11 12 13
14 15
NUMERICAL DESIGNATIONS — RESULTANT DISPLAYS
TRUTH TABLE
INPUTS
DECIMAL
OR
FUNCTION
10 H X H L H L H H H H L L H L
11 H X H L H H H H H L L H H L
12 H X H H L L H H L H H H L L
13 H X H H L H H L H H L H L L
14 H X H H H L H H H H L L L L
15 H X H H H H H H H H H H H H
RBI H L L L L L L H H H H H H H C
LT L X X X X X H L L L L L L L D
H = HIGH Voltage Level
L = LOW Voltage Level
NOTES:
(A) BI/RBO
held at a HIGH level when output functions 0 through 15 are desired, and ripple-blanking input (RBI
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) When ripple-blanking input (RBI
go to a HIGH level and the ripple-blanking output (RBO) goes to a LOW level (response condition).
(D) When the blanking input/ripple-blanking output (BI/RBO
all segment outputs go to a LOW level.
X = Immaterial
is wire-AND logic serving as blanking Input (BI) and/or ripple-blanking output (RBO). The blanking out (BI) must be open or
LT RBI D C B A BI/RBO a b c d e f g NOTE
0 H H L L L L H L L L L L L H A
1 H X L L L H H H L L H H H H A
2 H X L L H L H L L H L L H L
3 H X L L H H H L L L L H H L
4 H X L H L L H H L L H H L L
5 H X L H L H H L H L L H L L
6 H X L H H L H H H L L L L L
7 H X L H H H H L L L H H H H
8 H X H L L L H L L L L L L L
9 H X H L L H H L L L H H L L
BI X X X X X X L H H H H H H H B
) and inputs A, B, C, and D are at LOW level, with the lamp test input at HIGH level, all segment outputs
) is open or held at a HIGH level, and a LOW level is applied to lamp test input,
OUTPUTS
) must be open or at a HIGH level
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SN74LS47
VOHOutput HIGH Voltage, BI/RBO
2.4
4.2
V
CC OH
µ
V
g
CC IN IN
V
g
IIHInput HIGH Current
CC
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter
V
IH
V
IL
V
IK
Input HIGH Voltage 2.0 V
Input LOW Voltage
Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
Min Typ Max
p
OL
I
O(off)
O (on)
Output LOW Voltage
BI/RBO
Off-State Output Current
thru g
a
On-State Output Voltage
a thru g
0.25 0.4 V IOL = 1.6 mA
0.35 0.5 V IOL = 3.2 mA
250 µA
0.25 0.4 V I
0.35 0.5 V I
p
I
IL
Input LOW Current BI/RBO
Any Input except BI/RBO
–1.2
–0.4
IOS BI/RBO Output Short Circuit Current (Note 1) –0.3 –2.0 mA VCC = MAX, V
I
CC
Power Supply Current 7.0 13 mA VCC = MAX
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
t
PHL
t
PLH
t
PHL
t
PLH
Propagation Delay, Address
Input to Segment Output
Propagation Delay, RBI Input
To Segment Output
Min Typ Max
100
100
100
100
Unit Test Conditions
Guaranteed Input HIGH Theshold Voltage
for All Inputs
0.8
Guaranteed Input LOW Threshold Voltage
V
for All Inputs
VCC = MIN, IOH = –50 µA,
VIN = VIN or VIL per Truth Table
VCC = MAX, VIN = VIN or VIL per Truth
O(off)
= 12 mA
= 24 mA
= 15 V
Table, V
O (on)
O (on)
20 µA VCC = MAX, VIN = 2.7 V
0.1 mA VCC = MAX, VIN = 7.0 V
mA VCC = MAX, VIN = 0.4 V
OUT
Unit Test Conditions
ns
ns
ns
VCC = 5.0 V
CL = 15 pF
ns
VCC = MIN, VIN = V
or VIL per Truth Table
VCC = MAX, VIN = V
or VIL per Truth Table
= 0 V
IN
IH
AC WAVEFORMS
V
IN
V
OUT
1.3 V 1.3 V
t
PHL
t
PLH
1.3 V 1.3 V
V
IN
V
OUT
1.3 V 1.3 V
t
PHL
t
PLH
1.3 V1.3 V
Figure 1. Figure 2.
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P ACKAGE DIMENSIONS
–A–
916
B
18
F
H
G
D
16 PL
0.25 (0.010) T
C
S
SEATING
–T–
PLANE
K
M
A
SN74LS47
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
ISSUE R
L
J
M
NOTES:
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.
DIM MIN MAX MIN MAX
A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.70 1.02 1.77
G 0.100 BSC 2.54 BSC
M
H 0.050 BSC 1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M 0 10 0 10
S 0.020 0.040 0.51 1.01
MILLIMETERSINCHES
____
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SN74LS47
P ACKAGE DIMENSIONS
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B–05
ISSUE J
–T–
–A–
16 9
–B–
18
G
K
C
SEATING
PLANE
D
16 PL
0.25 (0.010) A
M
S
B
T
S
8 PLP
0.25 (0.010) B
M
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
M
S
X 45
R
_
F
J
PER SIDE.
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.
DIM MIN MAX MIN MAX
A 9.80 10.00 0.386 0.393
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019
F 0.40 1.25 0.016 0.049
G 1.27 BSC 0.050 BSC
J 0.19 0.25 0.008 0.009
K 0.10 0.25 0.004 0.009
M 0 7 0 7
____
P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019
INCHESMILLIMETERS
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Notes
SN74LS47
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SN74LS47
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8
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