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7446A Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor

Il numero della parte 7446A
Spiegazioni elettronici  BCD to 7-Segment Decoders/Drivers
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

7446A Scheda tecnica(HTML) 2 Page - Fairchild Semiconductor

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2
Function Table
H
= HIGH level,
L
= LOW level,
X
= Don’t Care
Note 1: BI/RBO is a wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO).
Note 2: The blanking input (BI) must be OPEN or held at a HIGH logic level when output functions 0 through 15 are desired. The ripple-blanking input (RBI)
must be OPEN or HIGH if blanking of a decimal zero is not desired.
Note 3: When a LOW logic level is applied directly to the blanking input (BI), all segment outputs are HIGH regardless of the level of any other input.
Note 4: When ripple-blanking input (RBI) and inputs A, B, C, and D are at a LOW level with the lamp test input HIGH, all segment outputs go H and the rip-
ple-blanking output (RBO) goes to a LOW level (response condition).
Note 5: When the blanking input/ripple-blanking output (BI/RBO) is OPEN or held HIGH and a LOW is applied to the lamp-test input, all segment outputs are
L.
Logic Diagram
Decimal or
Inputs
BI/RBO
Outputs
Note
Function
LT
RBI
D
C
B
A
(Note 1)
a
b
c
d
e
f
g
0
H
H
LLL
L
H
LLL
LLL
H
1
H
X
LLL
H
H
H
L
L
H
H
H
H
2
H
X
L
LH
L
H
L
L
H
L
LH
L
3
H
X
L
LH
H
H
L
L
L
LH
H
L
4
H
X
L
HL
L
H
H
L
L
H
HL
L
5
H
X
L
HL
H
H
L
H
L
L
HL
L
6
H
X
L
H
H
L
H
H
H
L
LLL
L
7
H
X
L
HHH
H
L
L
L
H
HHH
(Note 2)
8
H
X
H
LL
L
H
LLL
LLL
L
9
H
X
H
LL
H
H
LLL
H
H
L
L
10
H
X
HL
HL
H
H
H
H
L
L
HL
11
H
X
HL
H
H
H
H
H
L
L
H
HL
12
H
X
HH
L
L
H
H
L
H
HH
L
L
13
H
X
H
H
LH
H
L
H
H
LH
L
L
14
H
X
H
H
H
L
H
H
H
H
LLL
L
15
H
X
H
HHH
H
H
HHH
HHH
BI
X
X
X
X
X
X
L
H
HHH
HHH
(Note 3)
RBI
H
L
L
L
L
L
L
H
HHH
HHH
(Note 4)
LT
L
X
X
X
X
X
H
LLL
LLL
L
(Note 5)


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