HD74LS48
Function Table
Decimal or
Function
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
BI
RBI
LT
Inputs
LT
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
X
H
L
RBI
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
X
D
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
X
L
X
C
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
X
L
X
B
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
X
L
X
A
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
X
L
X
BI /
RBO
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
H
Outputs
a
H
L
H
H
L
H
L
H
H
H
L
L
L
H
L
L
L
L
H
b
H
H
H
H
H
L
L
H
H
H
L
L
H
L
L
L
L
L
H
c
H
H
L
H
H
H
H
H
H
H
L
H
L
L
L
L
L
L
H
d
H
L
H
H
L
H
H
L
H
L
H
H
L
H
H
L
L
L
H
e
H
L
H
L
L
L
H
L
H
L
H
L
L
L
H
L
L
L
H
f
H
L
L
L
H
H
H
L
H
H
L
L
H
H
H
L
L
L
H
g
L
L
H
H
H
H
H
L
H
H
H
H
H
H
H
L
L
L
H
2
3
4
1
Note
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
e
d
g
b
c
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
RENESAS [ RENESAS TECHNOLOGY CORP ]
