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HD74LS247
BCD-to-Seven-Segment Decoder / Driver
(with three-state outputs)
REJ03D0465–0300
Rev.3.00
Jul.15.2005
The HD74LS247 is electrically and functionally identical to the HD74LS47, respectively, and has the same pin
assignments as its equivalents.
It can be used interchangeably in present or future designs to offer designers a choice between two indicator fonts. The
HD74LS47 composes the 6 and the 9 without tails and the HD74LS247 composes the 6 and the 9 with tails.
Composition of all other characters, including display patterns for BCD inputs above nine, is identical. The
HD74LS247 features active-low outputs designed for driving indicators directly. All of the circuits have full ripple-
blanking input / output controls and a lamp test input.
Segment identification and resultant displays are shown below. Display patterns for BCD input conditions. This circuit
incorporates automatic leading and / or trailing-edge zero-blanking control (RBI and RBO). Lamp test (LT) of this type
may be performed at any time when the BI / RBO node is at a high level.
This type contains an overriding blanking input (BI) which can be used to control the lamp intensity be pulsing or to
inhibit the outputs.
Features
•
Ordering Information
Part Name
HD74LS247P
HD74LS247FPEL
HD74LS247RPEL
Package Type
DILP-16 pin
SOP-16 pin (JEITA)
SOP-16 pin (JEDEC)
Package Code
(Previous Code)
PRDP0016AE-B
(DP-16FV)
PRSP0016DH-B
(FP-16DAV)
PRSP0016DG-A
(FP-16DNV)
Package
Abbreviation
P
FP
RP
Taping Abbreviation
(Quantity)
—
EL (2,000 pcs/reel)
EL (2,500 pcs/reel)
Note: Please consult the sales office for the above package availability.
Rev.3.00, Jul.15.2005, page 1 of 7
HD74LS247
Pin Arrangement
B
Inputs
C
LT
BI/RBO
RBI
D
Inputs
A
GND
1
2
3
4
5
6
7
8
B
C
LT
BI/BRO
RBI
D
A
f
g
a
b
c
d
e
16
15
14
13
12
11
10
9
V
CC
f
g
a
b
c
d
e
Outputs
(Top view)
Function Table
Inputs
Outputs
Decimal
BI/
Note
or
RBO
LT
RBI
D
C
B
A
a
b
c
d
e
f
g
Function
0
H
H
L
L
L
L
H
ON
ON
ON
ON
ON
ON
OFF
1
H
X
L
L
L
H
H
OFF
ON
ON
OFF OFF OFF OFF
2
H
X
L
L
H
L
H
ON
ON
OFF
ON
ON
OFF
ON
3
H
X
L
L
H
H
H
ON
ON
ON
ON
OFF OFF
ON
4
H
X
L
H
L
L
H
OFF
ON
ON
OFF OFF
ON
ON
5
H
X
L
H
L
H
H
ON
OFF
ON
ON
OFF
ON
ON
6
H
X
L
H
H
L
H
ON
OFF
ON
ON
ON
ON
ON
7
H
X
L
H
H
H
H
ON
ON
ON
OFF OFF OFF OFF
1
8
H
X
H
L
L
L
H
ON
ON
ON
ON
ON
ON
ON
9
H
X
H
L
L
H
H
ON
ON
ON
ON
OFF
ON
ON
10
H
X
H
L
H
L
H
OFF OFF OFF
ON
ON
OFF
ON
11
H
X
H
L
H
H
H
OFF OFF
ON
ON
OFF OFF
ON
12
H
X
H
H
L
L
H
OFF
ON
OFF OFF OFF
ON
ON
13
H
X
H
H
L
H
H
ON
OFF OFF
ON
OFF
ON
ON
14
H
X
H
H
H
L
H
OFF OFF OFF
ON
ON
ON
ON
15
H
X
H
H
H
H
H
OFF OFF OFF OFF OFF OFF OFF
BI
X
X
X
X
X
X
L
OFF OFF OFF OFF OFF OFF OFF
2
RBI
H
L
L
L
L
L
L
OFF OFF OFF OFF OFF OFF OFF
3
LT
L
X
X
X
X
X
H
ON
ON
ON
ON
ON
ON
ON
4
H; high level, L; low level, X; irrelevant
Notes: 1. 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.
2. When a low logic level is applied directly to the blanking input (BI), all segment outputs are off regardless of
the level of any other input.
3. When ripple-blanking input (RBI) and inputs A, B, C, and D are a low level with the lamp test input high, all
segment outputs go off and the ripple-blanking output (RBO) goes to a low level (response condition).
4. When a blanking input ripple blanking input (BI/RBO) is open or held high and a low is applied to the lamp-
test input, all segment outputs are on.
Rev.3.00, Jul.15.2005, page 2 of 7
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