SN54LS48J Ver la hoja de datos (PDF) - Motorola => Freescale
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SN54LS48J Datasheet PDF : 3 Pages
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SN54 / 74LS48
PIN NAMES
LOADING (Note a)
HIGH
LOW
A, B, C, D
BCD Inputs
0.5 U.L.
0.25 U.L.
RBI
Ripple-Blanking (Active Low) Input
0.5 U.L.
0.25 U.L.
LT
Lamp-Test (Active Low) Input
0.5 U.L.
0.25 U.L.
BI / RBO
Blanking Input or Ripple-
0.5 U.L.
0.75 U.L.
Blanking Output (Active Low)
1.2 U.L.
2(1) U.L.
BI
Blanking (Active Low) Input
0.5 U.L.
0.25 U.L.
Open-Collector
3.75 (1.25) U.L. (48)
NOTES:
a) Unit Load (U.L.) = 40 µA HIGH / 1.6 mA LOW
b) Outut current measured at VOUT = 0.5 V
Output LOW drive factor is SN54LS / 74LS48: 1.25 U.L. for Military (54), 3.75 U.L. for Commercial (74).
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
NUMERICAL DESIGNATIONS — RESULTANT DISPLAYS
TRUTH TABLE
SN54 / 74LS48
INPUTS
OUTPUTS
DECIMAL
OR
LT RBI D C B A BI / RBO a b c d e f g NOTE
FUNCTION
0
H H L L LL
H
HHHHHH L
1
1
H X L L LH
H
LHHL L L L
1
2
H X L L HL
H
HH L HH L H
3
H X L L HH
H
HHHHL LH
4
H X L HLL
H
LHHL LHH
5
H X L H LH
H
H L HH L HH
6
H X L HHL
H
L LHHHHH
7
H X L H HH
H
HHHL L L L
8
H X H L LL
H
HHHHHHH
9
H X H L LH
H
HHHL LHH
10
H X H L HL
H
L L LHHLH
11
H X H L HH
H
L LHHL LH
12
H X H HLL
H
LHL L LHH
13
H X H H LH
H
HL LHLHH
14
H X H HHL
H
L L LHHHH
15
H X H H HH
H
LLLLLLL
BI
X X X X XX
L
LLLLLLL
2
RBI
H
L L L LL
L
LLLLLLL
3
LT
L
X X X XX
H
HHHHHHH 4
NOTES:
(1) BI/RBO is wired-AND logic serving as blanking input (BI) and/or
ripple-blanking output (RBO). The blanking out (BI) must be open
or held at a HIGH level when output functions 0 through 15 are
desired, and ripple-blanking input (RBI) must be open or at a HIGH
level if blanking of a decimal 0 is not desired. X=input may be HIGH
or LOW.
(2) When a LOW level is applied to the blanking input (forced condition)
all segment outputs go to a LOW level, regardless of the state of any
other input condition.
(3) When ripple-blanking input (RBI) and inputs A, B, C, and D are at
LOW level, with the lamp test input at HIGH level, all segment
outputs go to a HIGH level and the ripple-blanking output (RBO)
goes to a LOW level (response condition).
(4) When the blanking input/ripple-blanking output (BI/RBO) is open or
held at a HIGH level, and a LOW level is applied to lamp-test input,
all segment outputs go to a LOW level.
FAST AND LS TTL DATA
5-60
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