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National Semiconductor Electronic Components Datasheet


74247

BCD to 7-Segment Decoder/Driver


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74247 pdf
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
Dual-In-Line Package
May 1992
TL F 9822 – 1
Order Number DM74LS247M or DM74LS247N
See NS Package Number M16A or N16E
VCC e Pin 16
GND e Pin 8
Pin Names
A0 – A3
RBI
LT
BI RBO
a–g
Description
BCD Inputs
Ripple Blanking Input (Active LOW)
Lamp Test Input (Active LOW)
Blanking Input (Avtive LOW) or
Ripple Blanking Output (Active LOW)
Segment Outputs (Active LOW)
TL F 9822 – 2
C1995 National Semiconductor Corporation TL F 9822
RRD-B30M115 Printed in U S A



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74247 pdf
Absolute Maximum Ratings (Note)
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current BI RBO
Low Level Output Current
Free Air Operating Temperature
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed 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
Min Nom Max Units
4 75 5 5 25 V
2V
08 V
b50
mA
24 mA
0 70 C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
VI
VOH
IOFF
Input Clamp Voltage
High Level Output Voltage
Output High Current
Segment Outputs
VCC e Min II e b 18 mA
VCC e Min IOH e Max VIL e Max
VCC e 5 5V VO e 15V
BI RBO
a–g
VOL Low Level Output Voltage VCC e Min IOL e Max VIH e Min a – g
IOL e 3 2 mA
BI RBO
IOL e 12 mA
a–g
IOL e 1 6 mA
BI RBO
II Input Current Max VCC e Max VI e 7V
Input Voltage
IIH
High Level Input Current
VCC e Max VI e 2 7V
IIL
Low Level Input Current
VCC e Max VI e 0 4V
Other Inputs
VCC e Max VI e 0 4V
BI RBO Input
IOS Short Circuit Output Current VCC e Max (Note 2)
ICC Supply Current
VCC e Max
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second
Min
24
b0 3
Typ
(Note 1)
34
0 35
0 25
Max
b1 5
250
05
05
04
04
01
20
b0 4
b1 2
b2 0
13
Units
V
V
mA
V
mA
mA
mA
mA
mA
mA
Switching Characteristics
VCC e a5V TA e a25 C
Symbol
Parameter
tPLH
Propagation Delay Time
Low to High Level Output
tPHL
Propagation Delay Time
High to Low Level Output
RL e 2 kX
CL e 15 pF
Min Max
100
100
Units
ns
ns
2



Part Number 74247
Description BCD to 7-Segment Decoder/Driver
Maker National Semiconductor - National Semiconductor
Total Page 4 Pages
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