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DM74LS249N Folha de dados(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças DM74LS249N
Descrição Electrónicos  BCD to 7-Segment Decoder with Open-Collector Outputs
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM74LS249N Folha de dados(HTML) 3 Page - National Semiconductor (TI)

  DM74LS249N Datasheet HTML 1Page - National Semiconductor (TI) DM74LS249N Datasheet HTML 2Page - National Semiconductor (TI) DM74LS249N Datasheet HTML 3Page - National Semiconductor (TI) DM74LS249N Datasheet HTML 4Page - National Semiconductor (TI) DM74LS249N Datasheet HTML 5Page - National Semiconductor (TI) DM74LS249N Datasheet HTML 6Page - National Semiconductor (TI)  
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Switching Characteristics
VCC ea50V TA ea25 C
RL e 2kX
Symbol
Parameter
CL e 15 pF
Units
Min
Max
tPLH
Propagation Delay Time
100
ns
tPHL
An to a–g (54LS RL e 2kX)
100
tPLH
Propagation Delay Time
100
ns
tPHL
BI to a – g (54LS RL e 6kX)
100
Numerical DesignationsResultant Displays
TLF10213 – 3
Truth Table
Decimal
Inputs
Outputs
or
Note
Function
LT
A3
A2
A1
A0
BIRBO
abc
d
e
f
g
0
H
LLLL
H
HHHHHH
L
1
1
H
L
L
L
H
H
L
H
H
LLLL
1
2
H
L
L
H
L
H
H
HLH
HLH
3
H
L
L
H
H
H
HHHH
L
L
H
4
H
L
H
L
L
H
LH
HL
LH
H
5
H
LHLH
H
H
L
H
H
L
H
H
6
H
L
H
H
L
H
L
L
HHHHH
7
H
L
H
H
H
H
H
H
H
LLLL
8
H
H
L
L
L
H
HHHHHHH
9
H
H
L
L
H
H
HHH
L
L
HH
10
H
HLHL
H
L
L
L
H
H
L
H
11
H
H
L
H
H
H
LL
H
H
LL
H
12
H
H
H
L
L
H
L
H
LLL
H
H
13
H
H
H
L
H
H
H
L
LHLH
H
14
H
H
H
H
L
H
L
L
L
HHHH
15
H
HHHH
H
LLLLLLL
BI
X
XXXX
L
LLLLLLL
2
LT
L
XXXX
H
HHHHHHH
3
Note 1
BIRBO is wired-AND logic serving as blanking input (BI) andor 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 X e input may be HIGH or LOW
Note 2
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
Note 3
When the blanking inputripple-blanking output (BIRBO) is open or held at a HIGH level and a LOW level is applied to lamp test input all segment outputs
go to a HIGH level
3


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