FAIRCHILD DM74LS247

DM74LS247
BCD to 7-Segment Decoder/Driver with Open-Collector
Outputs
General Description
The ’LS247 has active LOW open-collector outputs guaranteed to sink 24 mA. It has the same electrial characteristics
and pin connections as the ’LS47. The only difference is that
Connection Diagram
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.
Logic Symbol
Dual-In-Line Package
DS009822-2
VCC = Pin 16
GND = Pin 8
DS009822-1
Order Number DM74LS247M or DM74LS247N
See Package Number M16A or N16E
Pin Names
Description
A0–A3
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)
a–g
© 1998 Fairchild Semiconductor Corporation
DS009822
Segment Outputs (Active LOW)
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DM74LS247 BCD to 7-Segment Decoder/Driver with Open-Collector Outputs
March 1998
Absolute Maximum Ratings (Note 1)
Supply Voltage
Input Voltage
Operating Free Air
Temperature Range
Storage Temperature Range
7V
7V
0˚C to +70˚C
−65˚C to +150˚C
Recommended Operating Conditions
Symbol
Parameter
Min
Nom
Max
Units
4.75
5
5.25
V
Low Level Input Voltage
0.8
V
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
2
V
IOH
High Level Output Current BI/RBO
−50
µA
IOL
Low Level Output Current
24
mA
TA
Free Air Operating Temperature
70
˚C
0
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)
VI
Input Clamp Voltage
VOH
High Level Output Voltage
IOFF
Output High Current
VCC = Min, II = − 18 mA
VCC = Min, IOH = Max, VIL = Max
VCC = 5.5V, VO = 15V
−1.5
2.4
3.4
V
V
250
µA
0.35
0.5
V
0.25
0.4
Segment Outputs
VOL
Low Level Output Voltage
Input Current @ Max
II
VCC =
Min
VCC
IOL = Max, VIH = Min
IOL = 3.2 mA
IOL = 12 mA
IOL = 1.6 mA
= Max, VI = 7V
0.5
BI/RBO
a –g
0.4
BI/RBO
0.1
mA
Input Voltage
IIH
High Level Input Current
IIL
Low Level Input Current
IOS
Short Circuit Output Current
VCC = Max, VI = 2.7V
VCC = Max, VI = 0.4V
VCC = Max, VI = 0.4V
VCC = Max (Note 3)
ICC
Supply Current
VCC = Max
Other Inputs
BI/RBO Input
−0.3
20
µA
−0.4
mA
−1.2
mA
−2.0
mA
13
mA
Note 2: All typicals are at VCC = 5V, TA = 25˚C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Switching Characteristics
VCC = +5V, TA = +25˚C
Symbol
RL = 2 kΩ
CL = 15 pF
Parameter
Min
tPLH
Propagation Delay Time
Units
Max
100
ns
100
ns
Low to High Level Output
tPHL
Propagation Delay Time
High to Low Level Output
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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
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DM74LS247 BCD to 7-Segment Decoder/Driver with Open-Collector Outputs
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into
sonably expected to cause the failure of the life support
the body, or (b) support or sustain life, and (c) whose
device or system, or to affect its safety or effectiveness.
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.
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