5-402
FAST AND LS TTL DATA
BCD-TO-SEVEN-SEGMENT
DECODERS/DRIVERS
The SN54/74LS247 thru SN54/74LS249 are BCD-to-Seven-Segment
Decoder/Drivers.
The LS247 and LS248 are functionally and electrically identical to the LS47
and LS48 with the same pinout configuration. The LS249 is a 16-pin version
of the 14-pin LS49 and includes full functional capability for lamp test and
ripple blanking which was not available in the LS49.
The composition of all characters, except the 6 and 9 are identical between
the LS247, 248, 249 and the LS47, 48 and 49. The LS47 thru 49 compose
the and without tails, the LS247 thru 249 compose the and with
the tails. The LS247 has active-low outputs for direct drive of indicators. The
LS248 and 249 have active-high outputs for driving lamp buffers.
All types feature a lamp test input and have full ripple-blanking input/output
controls. On all types an automatic leading and/or trailing-edge zero-blanking
control (RBI and RBO) is incorporated and an overriding blanking input (BI)
is contained which may be used to control the lamp intensity by pulsing or to
inhibit the output’s lamp test may be performed at any time when the BI/RBO
node is at high level. Segment identification and resultant displays are shown
below. Display pattern for BCD input counts above 9 are unique symbols to
authenticate input conditions.
LS247
•Open-Collector Outputs Drive Indicators Directly
•Lamp-Test Provision
•Leading/Trailing Zero Suppression
LS248
•Internal Pull-Ups Eliminate Need for External Resistors
•Lamp-Test Provision
•Leading/Trailing Zero Suppression
LS249
•Open-Collector Outputs
•Lamp-Test Provision
•Leading/Trailing Zero Suppression
SEGMENT
IDENTIFICATION
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
a
b
c
d
e
f g
NUMERICAL DESIGNATIONS AND RESULTANT DISPLAYS
SN54/74LS247
SN54/74LS248
SN54/74LS249
BCD-TO-SEVEN-SEGMENT
DECODERS/DRIVERS
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16 1
16
1
16 1
D SUFFIX
SOIC
CASE 751B-03
5-403
FAST AND LS TTL DATA
SN54/74LS247 • SN54/74LS248 • SN54/74LS249
SN54/74LS247
(TOP VIEW)
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SN54/74LS248
SN54/74LS259
(TOP VIEW)
ALL CIRCUIT TYPES FEATURE LAMP INTENSITY MODULATION CAPABILITY
DRIVER OUTPUTS
TYPICAL
POWER
DISSIPATION
TYPE ACTIVE
LEVEL OUTPUT
CONFIGURATION SINK
CURRENT MAX
VOLTAGE
TYPICAL
POWER
DISSIPATION
SN54LS247 low open-collector 12 mA 15 V 35 mW
SN54LS248 high 2.0 kΩ pull-up 2.0 mA 5.5 V 125 mW
SN54LS249 high open-collector 4.0 mA 5.5 V 40 mW
SN74LS247 low open-collector 24 mA 15 V 35 mW
SN74LS248 high 2.0 kΩ pull-up 6.0 mA 5.5 V 125 mW
SN74LS249 high open-collector 8.0 mA 5.5 V 40 mW
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LOGIC DIAGRAM
LS247 LS248, LS249
5-404
FAST AND LS TTL DATA
SN54/74LS247 • SN54/74LS248 • SN54/74LS249
LS247
FUNCTION TABLE
DECIMAL
OR
FUNCTION
INPUTS
BI/RBO
OUTPUTS
NOTE
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 ON ON ON ON ON ON OFF
1 H X L L L H H OFF ON ON OFF OFF OFF OFF
2 H X L L H L H ON ON OFF ON ON OFF ON
3 H X L L H H H ON ON ON ON OFF OFF ON
4 H X L H L L H OFF ON ON OFF OFF ON ON
5 H X L H L H H ON OFF ON ON OFF ON ON
6 H X L H H L H ON OFF ON ON ON ON ON
7 H X L H H H H ON ON ON OFF OFF OFF OFF 1
8 H X H L L L H ON ON ON ON ON ON ON
9 H X H L L H H ON ON ON ON OFF ON ON
10 H X H L H L H OFF OFF OFF ON ON OFF ON
11 H X H L H H H OFF OFF ON ON OFF OFF ON
12 H X H H L L H OFF ON OFF OFF OFF ON ON
13 H X H H L H H ON OFF OFF ON OFF ON ON
14 H X H H H L H OFF OFF OFF ON ON ON ON
15 H X H H H H H OFF OFF OFF OFF OFF OFF OFF
BI X X X X X X L OFF OFF OFF OFF OFF OFF OFF 2
RBI H L L L L L L OFF OFF OFF OFF OFF OFF OFF 3
LT L X X X X X H ON ON ON ON ON ON ON 4
LS248, LS249
FUNCTION TABLE
DECIMAL
OR
FUNCTION
INPUTS
BI/RBO
OUTPUTS
NOTE
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 H H H H H H L 1
1 H X L L L H H L H H L L L L 1
2 H X L L H L H H H L H H L H
3 H X L L H H H H H H H L L H
4 H X L H L L H L H H L L H H
5 H X L H L H H H L H H L H H
6 H X L H H L H H L H H H H H
7 H X L H H H H H H H L L L L 1
8 H X H L L L H H H H H H H H
9 H X H L L H H H H H H L H H
10 H X H L H L H L L L H H L H
11 H X H L H H H L L H H L L H
12 H X H H L L H L H L L L H H
13 H X H H L H H H L L H L H H
14 H X H H H L H L L L H H H H
15 H X H H H H H L L L L L L L
BI X X X X X X L L L L L L L L 2
RBI H L L L L L L L L L L L L L 3
LT L X X X X X H H H H H H H H 4
H = HIGH Level, L = LOW Level, X = Irrelevant
NOTES: 1. The blanking input (BI) must be open or held at a high logic level when output functions 0 through 15 are desired. The ripple-blanking input (RBI) must
NOTES: 1. be open or high if blanking of a decimal zero is not desired.
2. When a low logic level is applied directly to the blanking input (BI), all segment outputs are off regardless of the level of any other input.
3. When ripple-blanking input (RBI) and inputs A, B, C, and D are at a low level with the lamp test input high, all segment outputs go off and the
NOTES: 1. ripple-blanking output (RBO) goes to a low level (response condition).
4. When the blanking input/ripple blanking output (BI/RBO) is open or held high and a low is applied to the lamp-test input, all segment outputs are on.
BI/RBO is wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO).
5-405
FAST AND LS TTL DATA
SN54/74LS247
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 54
74 4.5
4.75 5.0
5.0 5.5
5.25 V
TAOperating Ambient Temperature Range 54
74 –55
025
25 125
70 °C
IOH Output Current — High BI/RBO 54, 74 –50 µA
IOL Output Current — Low BI/RBO 54
74 1.6
3.2 mA
VO(off) Off-State Output Voltage a–g 54, 74 15 V
IO(on) On-State Output Current a–g
On-State Output Current a–g 54
74 12
24 mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for
All Inputs
VIL
54 0.7
V
Guaranteed Input LOW Voltage for
All Inputs
VIL
74 0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VOH
Output HIGH Voltage
54 2.4 4.2 V
V
CC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOH
74 2.4 4.2 V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOL
Output LOW Voltage
54, 74 0.25 0.4 V IOL = 1.6 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VOL
74 0.35 0.5 V IOL = 3.2 mA
VIN = VIL or VIH
per Truth Table
IO(off) Off-State Output Current
a–g 54, 74 250 µAVCC = MAX, VIH = 2.0 V,
VO(off) = 15 V, VIL = MAX
VO(on)
On-State Output Voltage
54, 74 0.25 0.4 V IO(on) = 12 mA
V
CC = MIN, VIH = 2.0 V,
VIL per Truth Table
VO(on)
74 0.35 0.5 V IO(on) = 24 mA
VCC = MIN, VIH = 2.0 V,
VIL per Truth Table
IIH
Input HIGH Current
20 µA VCC = MAX, VIN = 2.7 V
IIH
Input HIGH Current
0.1 mA VCC = MAX, VIN = 7.0 V
I
IL
Input LOW Current
Any Input, except BI/RBO –0.4
mA V
CC = MAX, VIN = 0.4 V
IIL
BI/RBO –1.2
mA
VCC = MAX, VIN = 0.4 V
IOS Short Circuit Current
BI/RBO (Note 1) –0.3 –2.0 mA VCC = MAX
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 (VCC = 5.0 V, TA = 25°C)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
tPLH
tPHL Turn-Off Time from A Input
Turn-On Time from A Input 100
100 ns
C
L = 15 pF,
RL = 665 Ω
tPHL
tPLH Turn-Off Time from RBI Input
Turn-On Time from RBI Input 100
100 ns
CL = 15 pF,
RL = 665 Ω
5-406
FAST AND LS TTL DATA
SN54/74LS248
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 54
74 4.5
4.75 5.0
5.0 5.5
5.25 V
TAOperating Ambient Temperature Range 54
74 –55
025
25 125
70 °C
IOH
Output Current — High BI/RBO 54, 74 –50
µA
OH
Output Current — High a–g 54, 74 –100
IOL
Output Current — Low BI/RBO
Output Current — Low BI/RBO 54
74 1.6
3.2
mA
Output Current — Low a–g
Output Current — Low a–g 54
74 2.0
6.0
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for
All Inputs
VIL
54 0.7
V
Guaranteed Input LOW Voltage for
All Inputs
VIL
74 0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VOH
Output HIGH Voltage
54 2.4 4.2 V
V
CC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOH
74 2.4 4.2 V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
IOH Output Current
a–g 54, 74 –1.3 –2.0 mA VCC = MIN, VO = 0.85 V,
Input Conditions as for VOH
VOL
Output LOW Voltage
a–g 54, 74 0.25 0.4
V
IOL = 2.0 mA
VCC = MIN, VIH = 2.0 V,
VIL = per Truth Table
V
OL
74 0.35 0.5
V
IOL = 6.0 mA
VCC = MIN, VIH = 2.0 V,
VIL = per Truth Table
VOL
BI/RBO 54, 74 0.25 0.4
V
IOL = 1.6 mA
VIL = per Truth Table
74 0.35 0.5
V
IOL = 3.2 mA
IIH
Input HIGH Current
Any Input, except BI/RBO
20 µA VCC = MAX, VIN = 2.7 V
IIH
Input HIGH Current
Any Input, except BI/RBO
0.1 mA VCC = MAX, VIN = 7.0 V
I
IL
Input LOW Current
Any Input, except BI/RBO –0.4
mA V
CC = MAX, VIN = 0.4 V
IIL
BI/RBO –1.2
mA
VCC = MAX, VIN = 0.4 V
IOS Short Circuit Current
BI/RBO (Note 1) –0.3 –2.0 mA VCC = MAX
ICC Power Supply Current 25 38 mA VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (VCC = 5.0 V, TA = 25°C)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
tPLH
tPHL Propagation Delay Time, High-to-Low-Level Output from A Input
Propagation Delay Time, Low-to-High-Level Output from A Input 100
100 ns CL = 15 pF
RL = 4.0 kΩ
tPHL
tPLH Propagation Delay Time, High-to-Low-Level Output from RBI Input
Propagation Delay Time, Low-to-High-Level Output from RBI Input 100
100 ns CL = 15 pF
RL = 6.0 kΩ
5-407
FAST AND LS TTL DATA
SN54/74LS249
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 54
74 4.5
4.75 5.0
5.0 5.5
5.25 V
TAOperating Ambient Temperature Range 54
74 –55
025
25 125
70 °C
IOH Output Current — High BI/RBO 54, 74 –50 µA
IOL Output Current — Low BI/RBO
Output Current — Low BI/RBO 54
74 1.6
3.2 mA
VOH Output Voltage — High a–g 54, 74 5.5 V
IOL Output Current — Low a–g
Output Current — Low a–g 54
74 4.0
8.0 mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for
All Inputs
VIL
54 0.7
V
Guaranteed Input LOW Voltage for
All Inputs
VIL
74 0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VOH
Output HIGH Voltage
54 2.4 4.2 V
V
CC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOH
74 2.4 4.2 V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
IOH Output HIGH Current
a–g 54, 74 250 µAVCC = MIN, VIH = 2.0 V,
VOH = 5.5 V, VIL = MAX
VOL
Output LOW Voltage
BI/RBO 54, 74 0.25 0.4
V
IOL = 1.6 mA
VCC = MIN, VIH = 2.0 V,
VIL = per Truth Table
V
OL
74 0.35 0.5
V
IOL = 3.2 mA
VCC = MIN, VIH = 2.0 V,
VIL = per Truth Table
VOL
a–g 54, 74 0.25 0.4
V
IOL = 4.0 mA
VIL = per Truth Table
74 0.35 0.5
V
IOL = 8.0 mA
IIH
Input HIGH Current
Any Input, except BI/RBO
20 µA VCC = MAX, VIN = 2.7 V
IIH
Input HIGH Current
Any Input, except BI/RBO
0.1 mA VCC = MAX, VIN = 7.0 V
I
IL
Input LOW Current
Any Input, except BI/RBO –0.4
mA V
CC = MAX, VIN = 0.4 V
IIL
BI/RBO –1.2
mA
VCC = MAX, VIN = 0.4 V
IOS Short Circuit Current
BI/RBO (Note 1) –0.3 –2.0 mA VCC = MAX
ICC Power Supply Current 8.0 15 mA VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (VCC = 5.0 V, TA = 25°C)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
tPHL
tPLH Propagation Delay Time, High-to-Low-Level Output from A Input
Propagation Delay Time, Low-to-High-Level Output from A Input 100
100 ns CL = 15 pF, RL = 2.0 Ω
tPHL
tPLH Propagation Delay Time, High-to-Low-Level Output from RBI Input
Propagation Delay Time, Low-to-High-Level Output from RBI Input 100
100 ns CL = 15 pF, RL = 6.0 Ω
5-408
FAST AND LS TTL DATA
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16-Pin Plastic
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16-Pin Ceramic Dual In-Line
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5-409
FAST AND LS TTL DATA
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola 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 consequential or incidental damages. “Typical” parameters can and do vary in different
applications. All operating parameters, including “T ypicals” must be validated for each customer application by customer’s technical experts. Motorola does
not convey any license under its patent rights nor the rights of others. Motorola 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 Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such
unintended or unauthorized application, Buyer shall indemnify and hold Motorola 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 Motorola was negligent regarding the design or manufacture of the part.
Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Af firmative Action Employer.
Literature Distribution Centers:
USA: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036.
EUROPE: Motorola Ltd.; European Literature Centre; 88 Tanners Drive, Blakelands, Milton Keynes, MK14 5BP, England.
JAPAN: Nippon Motorola Ltd.; 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan.
ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong.
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