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SN54LS48 Datasheet

BCD TO 7-SEGMENT DECODER

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BCD TO 7-SEGMENT
DECODER
The SN54 / 74LS48 is a BCD to 7-Segment Decoder consisting of NAND
gates, input buffers and seven AND-OR-INVERT gates. Seven NAND gates
and one driver are connected in pairs to make BCD data and its complement
available to the seven decoding AND-OR-INVERT gates. The remaining
NAND gate and three input buffers provide lamp test, blanking input/ripple-
blanking input for the LS48.
The circuit accepts 4-bit binary-coded-decimal (BCD) and, depending on
the state of the auxiliary inputs, decodes this data to drive other components.
The relative positive logic output levels, as well as conditions required at the
auxiliary inputs, are shown in the truth tables.
The LS48 circuit incorporates automatic leading and / or trailing edge
zero-blanking control (RBI and RBO). Lamp Test (LT) may be activated any
time when the BI / RBO node is HIGH. Both devices contain an overriding
blanking input (BI) which can be used to control the lamp intensity by varying
the frequency and duty cycle of the BI input signal or to inhibit the outputs.
Lamp Intensity Modulation Capability (BI/RBO)
Internal Pull-Ups Eliminate Need for External Resistors
Input Clamp Diodes Eliminate High-Speed Termination Effects
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC f g a b c d e
16 15 14 13 12 11 10 9
12
BC
LOGIC DIAGRAM
A
B
INPUT
C
D
BLANKING INPUT OR
RIPPLE-BLANKING
OUTPUT
3 4 56
LT BI / RBO RBI D
78
A GND
a
b
c
OUTPUT
d
e
RIPPLE-BLANKING
INPUT
LAMP-TEST
INPUT
f
g
FAST AND LS TTL DATA
5-59
SN54/74LS48
BCD TO 7-SEGMENT
DECODER
LOW POWER SCHOTTKY
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXJ
SN74LSXXN
SN74LSXXD
Ceramic
Plastic
SOIC
LOGIC SYMBOL
71 2 63 5
A B C D LT RBI
SN54 / 74LS48
BI/
a b c d e f g RBO
13 12 11 10 9 15 14 4
VCC = PIN 16
GND = PIN 8


Motorola Electronic Components Datasheet

SN54LS48 Datasheet

BCD TO 7-SEGMENT DECODER

No Preview Available !

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 HHLHHLH
3 H X L L HH H HHHH L L H
4 H X L H LL H LHHL LHH
5 H X L H LH H HLHHLHH
6 H X L HHL H L LHHHHH
7 H X L H HH H HHH L 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 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 XX
L
LLLLLLL
2
RBI
H L L L LL
L
LLLLLLL
3
LT L X X X X X H H H H H H H H 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


Part Number SN54LS48
Description BCD TO 7-SEGMENT DECODER
Maker Motorola Inc
Total Page 3 Pages
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