SN54LS47D Ver la hoja de datos (PDF) - Motorola => Freescale
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SN54LS47D Datasheet PDF : 3 Pages
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SN54 / 74LS47
LOGIC DIAGRAM
A
B
INPUT
C
D
BLANKING INPUT OR
RIPPLE-BLANKING
OUTPUT
LAMP-TEST
INPUT
RIPPLE-BLANKING
INPUT
a
a
b
b
c
c
OUTPUT
d
d
e
e
f
f
g
g
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
NUMERICAL DESIGNATIONS — RESULTANT DISPLAYS
TRUTH TABLE
INPUTS
OUTPUTS
DECIMAL
OR
FUNCTION
0
LT RBI D C B A BI/RBO
H H LLLL
H
a b c d e f g NOTE
L L L L L LH
A
1
H X LLLH
H
HL LHHHH
A
2
H X LLHL
H
L LHL LHL
3
H X L LHH
H
L L L LHHL
4
H X LHLL
H
HL LHHL L
5
H X LHLH
H
LHL LHL L
6
H X LHHL
H
HHL L L L L
7
H X LHHH
H
L L LHHHH
8
H X HLLL
H
LLLLLLL
9
H X HLLH
H
L L LHHL L
10
H X HLHL
H
HHHL LHL
11
H X HLHH
H
HHL LHHL
12
H X HHL L
H
HLHHHL L
13
H X HHLH
H
LHHLHL L
14
H X HHHL
H
HHHL L L L
15
H X HHHH
H
HHHHHHH
BI
X X XXXX
L
HHHHHHH
B
RBI
H L LLLL
L
HHHHHHH
C
LT
L X XXXX
H
LLLLLLL
D
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
NOTES:
(A) 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
of a decimal 0 is not desired. X = input may be HIGH or LOW.
(B) When a LOW level is applied to the blanking input (forced condition) all segment outputs go to a LOW level regardless of the state of
any other input condition.
(C) When ripple-blanking input (RBI) and inputs A, B, C, and D are at 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).
(D) 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.
FAST AND LS TTL DATA
5-57
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