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7447 Scheda tecnica(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte 7447
Spiegazioni elettronici  BCD to 7-Segment Decoders/Drivers
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

7447 Scheda tecnica(HTML) 4 Page - National Semiconductor (TI)

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’47A Switching Characteristics
at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
Conditions
Min
Max
Units
tPLH
Propagation Delay Time
CL e 15 pF
100
ns
Low to High Level Output
RL e 120X
tPHL
Propagation Delay Time
100
ns
High to Low Level Output
Function Table
46A 47A
Decimal or
Inputs
BIRBO
Outputs
Note
Function
LT
RBI
D
C
B
A
(Note 1)
abc
d
e
f
g
0
H
H
L
LLL
H
LLLLLL
H
1
H
X
L
L
L
H
H
HL
LH
H
H
H
2
H
X
L
LHL
H
L
L
HL
LHL
3
H
X
L
L
H
H
H
LLLL
H
H
L
4
H
X
L
HL
L
H
HL
LH
HL
L
5
H
X
L
HLH
H
LHL
L
HL
L
6
H
X
L
HH
L
H
HH
L
L
L
L
L
7
H
X
L
HHH
H
L
L
L
H
HHH
(2)
8
H
X
H
LLL
H
LLLLLLL
9
H
X
H
LL
H
H
LLL
H
H
L
L
10
H
X
HLHL
H
H
H
H
L
L
HL
11
H
X
HLH
H
H
H
HL
LH
HL
12
H
X
HH
L
L
H
H
L
H
HH
L
L
13
H
X
HH
L
H
H
L
HH
L
H
L
L
14
H
X
HHH
L
H
H
HH
L
L
L
L
15
H
X
HHHH
H
H
HHHHHH
BI
X
X
X
X
X
X
L
H
HHHHHH
(3)
RBI
H
L
L
L
L
L
L
H
HHHHHH
(4)
LT
L
X
X
X
X
X
H
L
LLLLLL
(5)
Note 1
BIRBO is a wire-AND logic serving as blanking input (BI) andor 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 ripple-
blanking output (RBO) goes to a low level (response condition)
Note 5
When the blanking inputripple-blanking output (BIRBO) is open or held high and a low is applied to the lamp-test input all segment outputs are L
H e High level L e Low level X e Don’t Care
4


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