DM7446A View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
DM7446A Datasheet PDF : 6 Pages
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Function Table
Decimal or
Inputs
BI/RBO
Outputs
Note
Function LT RBI D C B A (Note 1) a b c d e f g
0
HHL L L L
H
L L L L L LH
1
HXL L LH
H
HL LHHHH
2
HXL LHL
H
L LHL LHL
3
HX L LHH
H
L L L LHHL
4
HXLHL L
H
HL LHH L L
5
HX L H L H
H
LHLLHLL
6
HX LHHL
H
HH L L L L L
7
HX LHHH
H
L L L H H H H (Note 2)
8
HXHL L L
H
LLLLLLL
9
HXHL LH
H
L L LHH L L
10
HXHLHL
H
HHHL LHL
11
HXH L HH
H
HH L LHHL
12
HXHH L L
H
HLHHH L L
13
HXHH LH
H
LHHLHL L
14
HX HHH L
H
HHHL L L L
15
HXHHHH
H
HHHHHHH
BI
XXXXXX
L
H H H H H H H (Note 3)
RBI
HL L L L L
L
H H H H H H H (Note 4)
LT
LXXXXX
H
L L L L L L L (Note 5)
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
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