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Renesas Electronics Components Datasheet

HD74LS248 Datasheet

BCD-to-Seven-Segment Decoder / Driver

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HD74LS248 pdf
HD74LS248
BCD-to-Seven-Segment Decoder / Driver
(internal pull-up outputs)
REJ03D0466–0300
Rev.3.00
Jul.15.2005
The HD74LS248 is electrically and functionally identical to the HD74LS48, 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 HD74LS48 composes the 6 and the 9 without tails and the HD74LS248 composes the
6 and the 9 with tails. Composition of all other characters, including display patterns for BCD inputs above nine, is
identical. The HD74LS248 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 count above 9 are unique symbols to authenticate 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
Package Type
HD74LS248FPEL SOP-16 pin (JEITA)
Package Code
(Previous Code)
PRSP0016DH-B
(FP-16DAV)
Package
Abbreviation
FP
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
Pin Arrangement
B
Inputs
C
Lamp
Test
RB
Output
RB
Input
D
Inputs
A
1
2
3
4
5
6
7
GND 8
B
C
LT
BI/BRO
RBI
D
A
f
g
a
b
c
d
e
16 VCC
15 f
14 g
13 a
12 b Outputs
11 c
10 d
9e
(Top view)
Rev.3.00, Jul.15.2005, page 1 of 6


Renesas Electronics Components Datasheet

HD74LS248 Datasheet

BCD-to-Seven-Segment Decoder / Driver

No Preview Available !

HD74LS248 pdf
HD74LS248
Function Table
Decimal
or
Function
LT
RBI
Inputs
DC
B
BI/
A RBO
a
b
Outputs
cde
f
Note
g
0 HHLLLLHHHHHHH L
1 HX LLLHH L HH L L L L
2 HX LLHL H HH L HH L H
3 H X L LHH H H H H H L L H
4 HX LHLL H L HH L L HH
5 HX LHLHH H L HH L HH
6 H X LHHL H H L H H H H H
7 H X LHHH H H H H L L L L
1
8 HXHLLL H HHHHHHH
9 HXHLLHH HHHH L HH
10 H X H L H L H L L L H H L H
11 H X H L H H H L L H H L L H
12 H X H H L L H L H L L L H H
13 H X H H L H H H L L H L H H
14 H X H H H L H L L L H H H H
15 H X H H H H H L L L L L L L
BI X X X X X X L L L L L L L L 2
RBI H L L L L L L L L L L L L L 3
LT L X X X X X H H H H H H H H 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 6


Part Number HD74LS248
Description BCD-to-Seven-Segment Decoder / Driver
Maker Renesas
Total Page 7 Pages
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