DM74LS247
BCD to 7-Segment Decoder/Driver with Open-Collector
Outputs
General Description
The 'LS247 has active LOW open-collector outputs guaran-
teed to sink 24 mA. It has the same electrial characteristics
and pin connections as the 'LS47. The only difference is that
the 'LS247 will light the top bar (segment a) for numeral 6
and the bottom bar (segment d) for number 9. For detailed
description and specifications please refer to the 'LS47 data
sheet.
Connection Diagram
Logic Symbol
Pin Names
Description
A0A3
BCD Inputs
RBI
Ripple Blanking Input (Active LOW)
LT
Lamp Test Input (Active LOW)
BI/RBO
Blanking Input (Active LOW) or
Ripple Blanking Output (Active LOW)
ag
Segment Outputs (Active LOW)
Dual-In-Line Package
DS009822-1
Order Number DM74LS247M or DM74LS247N
See Package Number M16A or N16E
DS009822-2
V
CC
= Pin 16
GND = Pin 8
March 1998
DM74LS247
BCD
to
7-Segment
Decoder/Driver
with
Open-Collector
Outputs
1998 Fairchild Semiconductor Corporation
DS009822
www.fairchildsemi.com
Absolute Maximum Ratings
(Note 1)
Supply Voltage
7V
Input Voltage
7V
Operating Free Air
Temperature Range
0C to +70C
Storage Temperature Range
-65C to +150C
Recommended Operating Conditions
Symbol
Parameter
Min
Nom
Max
Units
V
CC
Supply Voltage
4.75
5
5.25
V
V
IH
High Level Input Voltage
2
V
V
IL
Low Level Input Voltage
0.8
V
I
OH
High Level Output Current BI/RBO
-50
A
I
OL
Low Level Output Current
24
mA
T
A
Free Air Operating Temperature
0
70
C
Note 1:
The "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these
limits. The parametric values defined in the "Electrical Characteristics" table are not guaranteed at the absolute maximum ratings. The "Recommended Operating
Conditions" table will define the conditions for actual device operation.
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 2)
V
I
Input Clamp Voltage
V
CC
= Min, I
I
= - 18 mA
-1.5
V
V
OH
High Level Output Voltage
V
CC
= Min, I
OH
= Max, V
IL
= Max
2.4
3.4
V
I
OFF
Output High Current
V
CC
= 5.5V, V
O
= 15V
250
A
Segment Outputs
V
OL
Low Level Output Voltage
V
CC
=
Min
I
OL
= Max, V
IH
= Min
0.35
0.5
V
I
OL
= 3.2 mA
BI/RBO
0.5
I
OL
= 12 mA
a g
0.25
0.4
I
OL
= 1.6 mA
BI/RBO
0.4
I
I
Input Current
@
Max
V
CC
= Max, V
I
= 7V
0.1
mA
Input Voltage
I
IH
High Level Input Current
V
CC
= Max, V
I
= 2.7V
20
A
I
IL
Low Level Input Current
V
CC
= Max, V
I
= 0.4V
Other Inputs
-0.4
mA
V
CC
= Max, V
I
= 0.4V
BI/RBO Input
-1.2
mA
I
OS
Short Circuit Output Current
V
CC
= Max (Note 3)
-0.3
-2.0
mA
I
CC
Supply Current
V
CC
= Max
13
mA
Note 2: All typicals are at V
CC
= 5V, T
A
= 25C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Switching Characteristics
V
CC
= +5V, T
A
= +25C
R
L
= 2 k
Symbol
Parameter
C
L
= 15 pF
Units
Min
Max
t
PLH
Propagation Delay Time
100
ns
Low to High Level Output
t
PHL
Propagation Delay Time
100
ns
High to Low Level Output
www.fairchildsemi.com
2
Physical Dimensions
inches (millimeters) unless otherwise noted
16-Lead Small Outline Molded Package (M)
Order Number DM74LS247M
Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS247N
Package Number N16E
3
www.fairchildsemi.com
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE-
VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMI-
CONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or sys-
tems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, and (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
Fairchild Semiconductor
Corporation
Americas
Customer Response Center
Tel: 1-888-522-5372
www.fairchildsemi.com
Fairchild Semiconductor
Europe
Fax: +49 (0) 1 80-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 8 141-35-0
English
Tel: +44 (0) 1 793-85-68-56
Italy
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Hong Kong Ltd.
13th Floor, Straight Block,
Ocean Centre, 5 Canton Rd.
Tsimshatsui, Kowloon
Hong Kong
Tel: +852 2737-7200
Fax: +852 2314-0061
National Semiconductor
Japan Ltd.
Tel: 81-3-5620-6175
Fax: 81-3-5620-6179
DM74LS247
BCD
to
7-Segment
Decoder/Driver
with
Open-Collector
Outputs
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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