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HD74LS48 Datasheet

BCD-to-Seven-Segment Decoder/Driver

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HD74LS48
BCD-to-Seven-Segment Decoder / Driver (Internal Pull-up outputs)
REJ03D0411–0300
Rev.3.00
Jul.22.2005
HD74LS48 features active high outputs for driving lamp buffers. This circuit has full ripple blanking input / output
controls and a lamp test input. Display patterns for BCD input counts 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 these types may be performed at any time when the BI / RBO node is at a high level. It contains an
overriding blanking input (BI) which can be used to control the lamp intensity be pulsing or to inhibit the outputs.
Inputs and outputs are entirely compatible for use with TTL or DTL logic outputs.
Features
Ordering Information
Part Name
HD74LS48P
Package Type
DILP-16 pin
Package Code
(Previous Code)
PRDP0016AE-B
(DP-16FV)
Package
Abbreviation
P
Taping Abbreviation
(Quantity)
Pin Arrangement
B
Inputs
C
Lamp
Test
BI/RBO
1
2
3
4
RBI 5
D6
Inputs
A7
GND 8
B
C
LT
BI/RBO
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.22.2005, page 1 of 6


Renesas Electronics Components Datasheet

HD74LS48 Datasheet

BCD-to-Seven-Segment Decoder/Driver

No Preview Available !

HD74LS48
Function Table
Decimal or
Inputs
BI /
Outputs
Function LT RBI D C B A RBO a
b
c
d
e
f
Note
g
0
H H LLLL
H
HHHHHH L
1
H X LLLH
H
LHHL L L L
2
H X LLHL
H
HHLHHL H
3
H X L LHH
H
HHHHL L H
4
H X LHLL
H
LHHL LHH
5
H X LHLH
H
H L HH L HH
6
H X LHHL
H
L LHHHHH
7
H X LHHH
H
HHHL L L L
1
8
H X HLLL
H
HHHHHHH
9
H X HLLH
H
HHHL LHH
10
H X HLHL
H
L L LHHLH
11
H X HLHH
H
L LHHL L H
12
H X HHL L
H
LHL L LHH
13
H X HHLH
H
HL LHLHH
14
H X HHHL
H
L L LHHHH
15
H X HHHH
H
LLLLLLL
BI
X X XXXX
L
LLLL
LLL
2
RBI
H L LLLL
L
LLLL
LLL
3
LT
L X XXXX
H
HHHHHHH
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.
2. When a low logic level is applied directly to the blanking input (BI), all segment outputs are low regardless of
the level of any other input.
3. 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 low and the ripple-blanking output (RBO) goes to a low level (response condition).
4. When a 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 high.
a
f gb
ec
d 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Rev.3.00, Jul.22.2005, page 2 of 6


Part Number HD74LS48
Description BCD-to-Seven-Segment Decoder/Driver
Maker Renesas
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HD74LS48 Datasheet PDF






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