Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6 1Publication Order Number:
SN74LS47/D
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 Test Provision
•Leading/Trailing Zero Suppression
•Input Clamp Diodes Limit High-Speed Termination Ef fects
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 4.75 5.0 5.25 V
TAOperating Ambient
Temperature Range 0 25 70 °C
IOH Output Current – High
BI/RBO –50
m
A
IOL Output Current – Low
BI/RBO
BI/RBO
3.2 mA
VO(off) Of f–State Output Voltage
a to g 15 V
IO(on) On–State Output Current
a to g 24 mA
LOW
POWER
SCHOTTKY
SOIC
D SUFFIX
CASE 751B
http://onsemi.com
PLASTIC
N SUFFIX
CASE 648
16
1
16
1
Device Package Shipping
ORDERING INFORMATION
SN74LS47N 16 Pin DIP 2000 Units/Box
SN74LS47D 16 Pin 2500/Tape & Reel
SN74LS47
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2
LOGIC SYMBOL
CONNECTION DIAGRAM DIP (TOP VIEW)
BCD Inputs
Ripple–Blanking Input
Lamp–Test Input
Blanking Input or
Ripple–Blanking Output
Outputs
A, B, C, D
RBI
LT
BI/RBO
a, to g
0.5 U.L.
0.5 U.L.
0.5 U.L.
0.5 U.L.
1.2 U.L.
Open–Collector
0.25 U.L.
0.25 U.L.
0.25 U.L.
0.75 U.L.
2.0 U.L.
15 U.L.
NOTES:
a) 1 Unit Load (U.L.) = 40
m
A HIGH, 1.6 mA LOW.
b) Output current measured at VOUT = 0.5 V
b) The Output LOW drive factor is 15 U.L. for Commercial (74) Temperature Ranges.
HIGH LOW
(Note a)LOADING
PIN NAMES
14 13 12 11 10 9
123456
VCC
7
16 15
8
fg a b c d e
BCLTBI/RBO RBI D A GND
VCC = PIN 16
GND = PIN 8
712635
13 12 11 10 9 15 14 4
A B C D LT RBI
abcdefgBI/
RBO
TRUTH TABLE
INPUTS OUTPUTS
SN74LS47
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3
14 15
LOGIC DIAGRAM
NUMERICAL DESIGNATIONS — RESULTANT DISPLAYS
0 1 2 3 4 5 6 7 8 9 10 11 12 13
INPUT
BLANKING INPUT OR
RIPPLE-BLANKING
OUTPUT
RIPPLE-BLANKING
INPUT
LAMP-TEST INPUT
A
B
C
D
aa
bb
cc
dd
ee
ff
gg
OUTPUT
DECIMAL
OR
FUNCTION 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
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
BI X X X X X X L H H H H H H H B
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
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) When ripple-blanking input (RBI) and inputs A, B, C, and D are at LOW level, with the lamp test input at HIGH level, all segment outputs
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) 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.
SN74LS47
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4
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
VIH Input HIGH Voltage 2.0 VGuaranteed Input HIGH Theshold Voltage
for All Inputs
VIL Input LOW Voltage 0.8 VGuaranteed Input LOW Threshold Voltage
for All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VO
Out
p
ut HIGH Voltage BI/RBO
24
42
V
VCC = MIN, IOH = –50 µA,
V
OH
O
u
tp
u
t
HIGH
Voltage
,
BI/RBO
2
.
4
4
.
2
V
CC OH µ
VIN = VIN or VIL per Truth Table
VO
Output LOW Voltage 0.25 0.4 V IOL = 1.6 mA VCC = MIN, VIN = VIN
V
OL
g
BI/RBO 0.35 0.5 V IOL = 3.2 mA
CC IN IN
or VIL per T ruth Table
IO(off) Off-State Output Current
a thru g 250 µAVCC = MAX, VIN = VIN or VIL per Truth
Table, VO(off)
= 15 V
VO( )
On-State Output Voltage 0.25 0.4 V IO (on) = 12 mA VCC = MAX, VIN = VIH
V
O (on)
g
a thru g 0.35 0.5 V IO (on) = 24 mA or VIL per Truth Table
I
In
p
ut HIGH Current
20 µA VCC = MAX, VIN = 2.7 V
I
IH
Inp
u
t
HIGH
C
u
rrent
0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current BI/RBO
Any Input except BI/RBO –1.2
–0.4 mA VCC = MAX, VIN = 0.4 V
IOS BI/RBO Output Short Circuit Current (Note 1) –0.3 –2.0 mA VCC = MAX, VOUT = 0 V
ICC 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 (TA = 25°C)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
tPHL
tPLH Propagation Delay, Address
Input to Segment Output 100
100 ns
ns V
CC
= 5.0 V
tPHL
tPLH Propagation Delay, RBI Input
To Segment Output 100
100 ns
ns
CC
CL = 15 pF
AC WAVEFORMS
VIN
VOUT
1.3 V 1.3 V
1.3 V 1.3 V
tPHL tPLH
Figure 1. Figure 2.
1.3 V 1.3 V
1.3 V1.3 V
tPLH
tPHL
VIN
VOUT
SN74LS47
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5
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
ISSUE R
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.
–A–
B
FC
S
HGD
J
L
M
16 PL
SEATING
18
916
K
PLANE
–T–
M
A
M
0.25 (0.010) T
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.740 0.770 18.80 19.55
B0.250 0.270 6.35 6.85
C0.145 0.175 3.69 4.44
D0.015 0.021 0.39 0.53
F0.040 0.70 1.02 1.77
G0.100 BSC 2.54 BSC
H0.050 BSC 1.27 BSC
J0.008 0.015 0.21 0.38
K0.110 0.130 2.80 3.30
L0.295 0.305 7.50 7.74
M0 10 0 10
S0.020 0.040 0.51 1.01
____
SN74LS47
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6
PACKAGE DIMENSIONS
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B–05
ISSUE J
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)
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.
18
16 9
SEATING
PLANE
F
J
M
RX 45
_
G
8 PLP
–B–
–A–
M
0.25 (0.010) B S
–T–
D
K
C
16 PL
S
B
M
0.25 (0.010) A S
T
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
A9.80 10.00 0.386 0.393
B3.80 4.00 0.150 0.157
C1.35 1.75 0.054 0.068
D0.35 0.49 0.014 0.019
F0.40 1.25 0.016 0.049
G1.27 BSC 0.050 BSC
J0.19 0.25 0.008 0.009
K0.10 0.25 0.004 0.009
M0 7 0 7
P5.80 6.20 0.229 0.244
R0.25 0.50 0.010 0.019
____
SN74LS47
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Notes
SN74LS47
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8
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