TL/F/10187
DM54LS447/DM74LS447 BCD to 7-Segment Decoder/Driver with Open-Collector Outputs
May 1992
DM54LS447/DM74LS447
BCD to 7-Segment Decoder/Driver
with Open-Collector Outputs
General Description
The ’LS447 is the same as the ’LS247 except that the Out-
put OFF Voltage, VOH is specified as 7.0V rather than 15V,
with the same IOH limit of 250 mA. For all other information
please refer to the ’LS247 data sheet.
Connection Diagram
Dual-In-Line Package
TL/F/10187–1
Order Number DM54LS447J, DM54LS447W, DM74LS447M or DM74LS447N
See NS Package Number J16A, M16A, N16E or W16A
C1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
Absolute Maximum Ratings (Note)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range
DM54LS b55§Ctoa
125§C
DM74LS 0§Ctoa
70§C
Storage Temperature Range b65§Ctoa
150§C
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.
Recommended Operating Conditions
Symbol Parameter DM54LS447 DM74LS447 Units
Min Nom Max Min Nom Max
VCC Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
VIH High Level Input Voltage 2 2 V
VIL Low Level Input Voltage 0.7 0.8 V
IOH High Level Output Current (BI/RBO) b50 b50 mA
IOL Low Level Output Current 12 24 mA
TAFree Air Operating Temperature b55 125 0 70 §C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min Typ Max Units
(Note 1)
VIInput Clamp Voltage VCC eMin, IIeb
18 mA b1.5 V
VOH High Level Output VCC eMin, IOH eMax, DM54 2.4 V
Voltage VIL eMax (BI/RBO) DM74 2.4 3.4
IOFF High Level Output Current Segment Outputs, VOe7.0V (a–g) 250 mA
VOL Low Level Output VCC Min, IOL eMax, DM54 0.4
Voltage VIH eMin DM74 0.35 0.5 V
IOL e12 mA, VCC eMin DM74 0.25 0.4
IIInput Current @Max VCC eMax, VIe7V 0.1 mA
Input Voltage VIe10V (DM54)
IIH High Level Input Current VCC eMax, VIe2.7V 20 mA
IIL Low Level Input Current VCC eMax, VIe0.4V Others b0.4 mA
BI/RBO Inputs b1.2 mA
IOS Short Circuit VCC eMax DM54 b0.3 b2.0 mA
Output Current (Note 2) DM74 b0.3 b2.0
ICC Supply Current VCC eMax 13 mA
Note 1: All typicals are at VCC e5V, TAe25§C.
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Switching Characteristics at VCC e5V, TAe25§C
Symbol Parameter RLe2kX,C
Le15 pF Units
Min Max
tPLH Propagation Delay 100 ns
tPHL 100
2
Logic Symbol
TL/F/10187–2
VCC ePin 16
GND ePin 8
State Diagram
TL/F/10187–3
3
Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number DM54LS447J
NS Package Number J16A
4
Physical Dimensions inches (millimeters) (Continued)
16-Lead Small Outline Molded Package (M)
Order Number DM74LS447M
NS Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS447N
NS Package Number N16E
5
DM54LS447/DM74LS447 BCD to 7-Segment Decoder/Driver with Open-Collector Outputs
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number DM54LS447W
NS Package Number W16A
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systems which, (a) are intended for surgical implant support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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