HD74LS248 Datasheet, PDF (1/7 Pages) Hitachi Semiconductor – BCD-to-Seven-Segment Decoders/Drivers(internal pull-up outputs)

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
B1
Inputs
C2
Lamp
Test
3
RB
Output
4
RB
Input
5
D6
Inputs
A7
GND 8
B
f
C
g
LT
a
BI/BRO b
RBI
c
D
d
A
e
16 V_CC
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