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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 A. 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 Effects
GUARANTEED OPERATING RANGES
Symbol VCC TA IOH IOL Parameter Supply Voltage Operating Ambient Temperature 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 Min 4.75 0 Typ 5.0 25 Max 5.25 70 - 50 3.2 Unit V C
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LOW POWER SCHOTTKY
16 1
PLASTIC N SUFFIX CASE 648
16 1
SOIC D SUFFIX CASE 751B
ORDERING INFORMATION
Device SN74LS47N SN74LS47D Package 16 Pin DIP 16 Pin Shipping 2000 Units/Box 2500/Tape & Reel
mA
mA
VO(off) IO(on)
15 24
V mA
(c) Semiconductor Components Industries, LLC, 1999
1
December, 1999 - Rev. 6
Publication Order Number: SN74LS47/D
SN74LS47
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 f 15 g 14 a 13 b 12 c 11 d 10 e 9
1 B
2 C
3
4
5
6 D
7 A
8 GND
LT BI / RBO RBI
LOADING (Note a) PIN NAMES A, B, C, D RBI LT BI/RBO a, to g BCD Inputs Ripple-Blanking Input Lamp-Test Input Blanking Input or Ripple-Blanking Output Outputs HIGH 0.5 U.L. 0.5 U.L. 0.5 U.L. 0.5 U.L. 1.2 U.L. Open-Collector LOW 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 mA 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.
LOGIC SYMBOL
712635
A B C D LT RBI BI/ f g RBO
a
bcd
e
13 12 11 10 9 15 14 4 VCC = PIN 16 GND = PIN 8
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SN74LS47
LOGIC DIAGRAM
a A b B INPUT C D d BLANKING INPUT OR RIPPLE-BLANKING OUTPUT d c c OUTPUT b a
e
e
f LAMP-TEST INPUT RIPPLE-BLANKING INPUT
f
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 DECIMAL OR FUNCTION 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 BI RBI LT OUTPUTS
LT H H H H H H H H H H H H H H H H X H L
RBI H X X X X X X X X X X X X X X X X L X
D L L L L L L L L H H H H H H H H X L X
C L L L L H H H H L L L L H H H H X L X
B L L H H L L H H L L H H L L H H X L X
A L H L H L H L H L H L H L H L H X L X
BI/RBO H H H H H H H H H H H H H H H H L L H
a L H L L H L H L L L H H H L H H H H L
b L L L L L H H L L L H H L H H H H H L
c L L H L L L L L L L H L H H H H H H L
d L H L L H L L H L H L L H L L H H H L
e L H L H H H L H L H L H H H L H H H L
f L H H H L L L H L L H H L L L H H H L
g H H L L L L L H L L L L L L L H H H L
NOTE A A
B C 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.
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SN74LS47
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VIL VIK VO OH VO OL IO (off) VO (on) () IIH IIL IOS BI / RBO ICC Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage BI / RBO Voltage, Output LOW Voltage g BI / RBO Off-State Output Current a thru g On-State Output Voltage g a thru g Input HIGH Current Input LOW Current BI / RBO Any Input except BI / RBO Output Short Circuit Current (Note 1) Power Supply Current - 0.3 7.0 0.25 0.35 2.4 24 - 0.65 4.2 42 0.25 0.35 0.4 0.5 250 0.4 0.5 20 0.1 - 1.2 - 0.4 -2.0 13 Min 2.0 0.8 - 1.5 Typ Max Unit V V V V V V A V V A mA mA mA mA Test Conditions Guaranteed Input HIGH Theshold Voltage for All Inputs Guaranteed Input LOW Threshold Voltage for All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = - 50 A, VIN = VIN or VIL per Truth Table IOL = 1.6 mA IOL = 3.2 mA VCC = MIN, VIN = VIN or VIL per Truth Table
VCC = MAX, VIN = VIN or VIL per Truth Table, VO (off) = 15 V IO (on) = 12 mA IO (on) = 24 mA VCC = MAX, VIN = VIH or VIL per Truth Table
VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V VCC = MAX, VOUT = 0 V VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25C)
Limits Symbol tPHL tPLH tPHL tPLH Parameter Propagation Delay, Address Input to Segment Output Propagation Delay, RBI Input To Segment Output Min Typ Max 100 100 100 100 Unit ns ns ns ns Test Conditions VCC = 5.0 V CL = 15 pF
AC WAVEFORMS
VIN
1.3 V tPHL
1.3 V tPLH 1.3 V 1.3 V
VIN
1.3 V tPHL
1.3 V tPLH 1.3 V
VOUT
VOUT
1.3 V
Figure 1.
Figure 2.
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SN74LS47
PACKAGE DIMENSIONS
N SUFFIX PLASTIC PACKAGE CASE 648-08 ISSUE R
-A-
16 9 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 A B C D F G H J K L M S INCHES MIN MAX 0.740 0.770 0.250 0.270 0.145 0.175 0.015 0.021 0.040 0.70 0.100 BSC 0.050 BSC 0.008 0.015 0.110 0.130 0.295 0.305 0_ 10 _ 0.020 0.040 MILLIMETERS MIN MAX 18.80 19.55 6.35 6.85 3.69 4.44 0.39 0.53 1.02 1.77 2.54 BSC 1.27 BSC 0.21 0.38 2.80 3.30 7.50 7.74 0_ 10 _ 0.51 1.01
B
1 8
F S
C
L
-T- H G D
16 PL
SEATING PLANE
K
J TA
M
M
0.25 (0.010)
M
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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. 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. MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019
16
9
-B-
1 8
P
8 PL
0.25 (0.010)
M
B
S
G F
K C -T-
SEATING PLANE
R
X 45 _
M D
16 PL M
J
0.25 (0.010)
TB
S
A
S
DIM A B C D F G J K M P R
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SN74LS47
Notes
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SN74LS47
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
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SN74LS47/D

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