DM5447A National Semiconductor, DM5447A Datasheet - Page 4

• Manufacturer Part Number: DM5447A
• Description: BCD to 7-Segment Decoders/Drivers
• Manufacturer: National Semiconductor

’47A Switching Characteristics
at V
Function Table
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 ripple-
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
H
Decimal or
e
Function
CC
t
t
Symbol
High level L
PLH
PHL
RBI
LT
10
11
12
13
14
15
BI
0
1
2
3
4
5
6
7
8
9
e
5V and T
e
Low level X
LT
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
X
L
A
e
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
25 C (See Section 1 for Test Waveforms and Output Load)
RBI
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
e
Parameter
Don’t Care
Inputs
D
H
H
H
H
H
H
H
H
X
X
L
L
L
L
L
L
L
L
L
C
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
X
L
X
B
H
H
H
H
H
H
H
H
X
X
L
L
L
L
L
L
L
L
L
A
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
X
L
X
46A 47A
Conditions
C
R
BI RBO
(Note 1)
L
L
4
e
e
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
15 pF
120
H
H
H
H
H
H
H
H
H
H
a
L
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
H
b
L
L
L
L
L
L
L
L
L
L
Min
H
H
H
H
H
H
H
H
c
L
L
L
L
L
L
L
L
L
L
L
Outputs
H
H
H
H
H
H
H
H
d
L
L
L
L
L
L
L
L
L
L
L
H
e
H
H
H
H
H
H
H
H
H
H
H
Max
L
L
L
L
L
L
L
100
100
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
f
g
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
Units
ns
ns
Note
(2)
(3)
(4)
(5)