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DM74LS47 Datasheet(PDF) 3 Page - Fairchild Semiconductor

No. de pieza DM74LS47
Descripción Electrónicos  BCD to 7-Segment Decoder/Driver with Open-Collector Outputs
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

DM74LS47 Datasheet(HTML) 3 Page - Fairchild Semiconductor

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Switching Characteristics
at V
CC = +5.0V, TA = +25˚C
R
L = 665Ω
Symbol
Parameter
Conditions
C
L = 15 pF
Units
Min
Max
t
PLH
Propagation Delay
100
ns
t
PHL
An to a –g
100
t
PLH
Propagation Delay
100
ns
t
PHL
RBI to a –g (Note 6)
100
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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