DM54LS47J [FAIRCHILD]
BCD to 7-Segment Decoder/Driver with Open-Collector Outputs; BCD到7段解码器/驱动器，集电极开路输出
| 型号： | DM54LS47J |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | BCD to 7-Segment Decoder/Driver with Open-Collector Outputs |
| 文件： | 总8页 (文件大小：204K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 1998
DM74LS47
BCD to 7-Segment Decoder/Driver with Open-Collector
Outputs
General Description
Features
n Open-collector outputs
n Drive indicator segments directly
n Cascadable zero-suppression capability
n Lamp test input
The ’LS47 accepts four lines of BCD (8421) input data, gen-
erates their complements internally and decodes the data
with seven AND/OR gates having open-collector outputs to
drive indicator segments directly. Each segment output is
guaranteed to sink 24 mA in the ON (LOW) state and with-
stand 15V in the OFF (HIGH) state with a maximum leakage
current of 250 µA. Auxiliary inputs provided blanking, lamp
test and cascadable zero-suppression functions.
Connection Diagram
Dual-In-Line Package
DS009817-1
Order Number DM54LS47J, DM54LS47W,
DM74LS47M or DM74LS47N
See Package Number J16A, M16A, N16E or W16A
Pin Names
Description
A0–A3
RBI
BCD Inputs
Ripple Blanking Input (Active LOW)
Lamp Test Input (Active LOW)
LT
BI/RBO
Blanking Input (Active LOW) or
Ripple Blanking Output (Active LOW)
*
a –g
Segment Outputs (Active LOW)
*
Note 1: OC—Open Collector
© 1998 Fairchild Semiconductor Corporation
DS009817
www.fairchildsemi.com
Absolute Maximum Ratings (Note 2)
DM54LS
−55˚C to +125˚C
0˚C to +70˚C
DM74LS
Supply Voltage
7V
7V
Storage Temperature Range
−65˚C to +150˚C
Input Voltage
Operating Free Air Temperature Range
Recommended Operating Conditions
Symbol
Parameter
DM54LS47
DM74LS47
Units
Min
4.5
2
Nom
Max
Min
4.75
2
Nom
Max
VCC
Supply Voltage
5
5.5
5
5.25
V
V
VIH
VIL
IOH
High Level Input Voltage
Low Level Input Voltage
0.7
0.8
V
High Level Output Current a − g
−50
−250
µA
=
@
15V VOH (Note 3)
IOH
IOL
TA
High Level Output Current BI /RBO
Low Level Output Current
−50
24
µA
mA
˚C
12
Free Air Operating Temperature
−55
125
0
70
Note 2: 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.
Note 3: OFF state at a–g.
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 4)
=
=
VI
Input Clamp Voltage
High Level
VCC Min, II −18 mA
−1.5
V
V
=
=
VOH
VCC Min, IOH Max,
DM54
DM74
2.4
2.7
=
Output Voltage
Output High Current
Segment Outputs
Low Level
VIL Max, BI /RBO
3.4
=
=
IOFF
VCC 5.5V, VO 15V a − g
250
µA
=
=
VOL
VCC Min, IOL Max,
DM54
DM74
DM74
DM74
DM74
DM74
DM54
0.4
0.5
0.5
0.4
0.4
100
=
Output Voltage
VIH Min, a − g
0.35
0.25
=
IOL 3.2 mA, BI /RBO
V
=
IOL 12 mA, a –g
=
IOL 1.6 mA, BI /RBO
=
=
@
II
Input Current Max
VCC Max, VI 7V
µA
= =
VCC Max, VI 10V
Input Voltage
=
=
IIH
IIL
High Level Input Current
Low Level Input Current
Short Circuit
VCC Max, VI 2.7V
20
µA
mA
mA
=
=
VCC Max, VI 0.4V
−0.4
−2.0
−2.0
13
=
IOS
VCC Max
DM54
DM74
−0.3
−0.3
Output Current
(Note 5) , IOS at BI/RBO
=
ICC
Supply Current
VCC Max
mA
=
=
25˚C.
Note 4: All typicals are at V
5V, T
CC
A
Note 5: Not more than one output should be shorted at a time, and the duration should not exceed one second.
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2
Switching Characteristics
=
=
at VCC +5.0V, TA +25˚C
=
RL 665Ω
=
Symbol
tPLH
Parameter
Conditions
CL 15 pF
Units
ns
Min
Max
100
100
100
100
Propagation Delay
An to a –g
tPHL
tPLH
tPHL
Propagation Delay
RBI to a –g (Note 6)
ns
=
=
Note 6: LT HIGH, A0–A3 LOW
Functional Description
The ’LS47 decodes the input data in the pattern indicated in
the Truth Table and the segment identification illustration. If
the input data is decimal zero, a LOW signal applied to the
RBI blanks the display and causes a multidigit display. For
example, by grounding the RBI of the highest order decoder
and connecting its BI/RBO to RBI of the next lowest order
decoder, etc., leading zeros will be suppressed. Similarly, by
grounding RBI of the lowest order decoder and connecting
its BI/RBO to RBI of the next highest order decoder, etc.,
trailing zeros will be suppressed. Leading and trailing zeros
can be suppressed simultaneously by using external gates,
i.e.: by driving RBI of a intermediate decoder from an OR
gate whose inputs are BI/RBO of the next highest and lowest
order decoders. BI/RBO also serves as an unconditional
blanking input. The internal NAND gate that generates the
RBO signal has a resistive pull-up, as opposed to a totem
pole, and thus BI/RBO can be forced LOW by external
means, using wired-collector logic. A LOW signal thus ap-
plied to BI/RBO turns off all segment outputs. This blanking
feature can be used to control display intensity by varying
the duty cycle of the blanking signal. A LOW signal applied to
LT turns on all segment outputs, provided that BI/RBO is not
forced LOW.
3
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Logic Diagram
DS009817-3
Numerical Designations—Resultant Displays
DS009817-4
www.fairchildsemi.com
4
Logic Symbol
DS009817-2
=
V
Pin 16
CC
=
GND Pin 8
Truth Table
Decimal
or
Inputs
Outputs
Note
Function
LT
H
RBI
H
A3
L
A2
L
A1
L
A0
L
BI/RBO
a
L
H
L
L
b
c
L
L
H
L
d
L
H
L
L
e
L
f
g
H
H
L
0
1
2
3
H
H
H
H
L
L
L
L
L
(Note 7)
(Note 7)
H
X
L
L
L
H
L
H
L
H
H
H
H
X
L
L
H
H
H
X
L
L
H
H
L
4
5
6
7
8
H
H
H
H
H
X
X
X
X
X
L
L
L
L
H
H
H
H
H
L
L
L
L
H
L
H
H
H
H
H
H
L
L
H
H
L
L
L
L
L
L
H
L
H
H
L
L
L
L
H
L
L
L
L
H
L
H
H
L
H
L
L
H
L
H
L
H
L
L
L
9
H
H
H
H
H
X
X
X
X
X
H
H
H
H
H
L
L
L
H
H
L
H
L
H
H
H
H
H
L
H
H
H
L
L
H
H
L
L
H
L
H
L
H
L
L
H
H
L
L
L
L
L
L
10
11
12
13
L
H
L
L
H
H
H
H
H
H
H
H
L
L
H
H
L
14
15
H
H
X
H
L
X
X
X
L
H
H
X
L
H
H
X
L
H
H
X
L
L
H
X
L
H
H
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
L
H
H
H
L
L
H
H
H
L
L
H
H
H
L
L
H
H
H
L
BI
(Note 8)
(Note 9)
(Note 10)
RBI
LT
L
X
X
X
X
X
H
Note 7: BI/RBO is wire-AND logic serving as blanking input (BI ) and/or ripple-blanking output (RBO ). The blanking out (BI ) must be open or held at a HIGH level
=
when output functions 0 through 15 are desired, and ripple-blanking input (RBI ) must be open or at a HIGH level if blanking or a decimal 0 is not desired. X input
may be HIGH or LOW.
Note 8: When a LOW level is applied to the blanking input (forced condition) all segment outputs go to a HIGH level regardless of the state of any other input con-
dition.
Note 9: When ripple-blanking input (RBI) and inputs A0, A1, A2 and A3 are LOW level, with the lamp test input at HIGH level, all segment outputs go to a HIGH level
and the ripple-blanking output (RBO ) goes to a LOW level (response condition).
Note 10: When the blanking input/ripple-blanking output (BI/RBO ) is open or held at a HIGH level, and a LOW level is applied to lamp test input, all segment outputs
go to a LOW level.
5
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Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Ceramic Dual-In-Line Package (J)
Order Number DM54LS47J
Package Number J16A
16-Lead Small Outline Molded Package (M)
Order Number DM74LS47M
Package Number M16A
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6
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS47N
Package Number N16E
16-Lead Ceramic Flat Package (W)
Order Number DM54LS47W
Package Number W16A
7
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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
Fairchild Semiconductor
Europe
Fairchild Semiconductor
Hong Kong Ltd.
National Semiconductor
Japan Ltd.
Americas
Customer Response Center
Tel: 1-888-522-5372
Fax: +49 (0) 1 80-530 85 86
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Tel: +39 (0) 2 57 5631
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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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