7-SEGMENT DECODER. SN54LS48 Datasheet

SN54LS48 DECODER. Datasheet pdf. Equivalent

SN54LS48 Datasheet
Recommendation SN54LS48 Datasheet
Part SN54LS48
Description BCD TO 7-SEGMENT DECODER
Feature SN54LS48; SN54/74LS48 BCD TO 7-SEGMENT DECODER The SN54 / 74LS48 is a BCD to 7-Segment Decoder consisting of N.
Manufacture Motorola Inc
Datasheet
Download SN54LS48 Datasheet




Motorola  Inc SN54LS48
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  Inc SN54LS48
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



Motorola  Inc SN54LS48
SN54 / 74LS48
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA Operating Ambient Temperature Range
IOH
Output Current — High
a to g
IOH
Output Current — High
BI / RBO
IOL
Output Current — Low
a to g
IOL
Output Current — Low
BI / RBO
BI / RBO
Min Typ Max Unit
54 4.5 5.0 5.5
74 4.75 5.0 5.25
V
54 – 55 25 125 °C
74 0 25 70
54, 74
– 100
µA
54, 74
– 50 µA
54 2.0 mA
74 6.0
54 1.6 mA
74 3.2
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage
2.0
Guaranteed Input HIGH Voltage for
V All Inputs
VIL Input LOW Voltage
54
74
0.7 Guaranteed Input LOW Voltage for
0.8 V All Inputs
VIK
VOH
Input Clamp Diode Voltage
Output HIGH Voltage
– 1.5
V VCC = MIN, IIN = – 18 mA
2.4 4.2
µA
VCC = MIN, IOH = – 50 µA,
VIN = VIH or U.L. per Truth Table
IO
VOL
VOL
IIH
IIL
Output Current a to g
Output LOW Voltage a to g
Output LOW Voltage
BI / RBO
Input HIGH Current
(Except BI / RBO)
Input LOW Current
(Except BI / RBO)
54, 74
74
54, 74
74
– 1.3
– 2.0
0.4
0.5
0.4
0.5
20
0.1
– 0.4
mA
VCC = MIN, VO = 0.85 V
Input Conditioner as for VOH
V IOL = 2.0 mA VCC = MIN, VIH = 2.0 V
V IOL = 6.0 mA VIL = VIL MAX
V IOL = 1.6 mA VCC = MAX, VIH = 2.0 V
V IOL = 3.2 mA VIL = VIL MAX
µA VCC = MAX, VIN = 2.7 V
mA VCC = MAX, VIN = 7.0 V
mA VCC = MAX, VIN = 0.4 V
IIL Input LOW Current BI/ RBO
– 1.2 mA VCC = MAX, VIN = 0.4 V
ICC Power Supply Current
25 38 mA VCC = MAX
IOS Short Circuit Current BI/ RBO (Note 1) – 0.3
–2.0
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
mA VCC = MAX
AC CHARACTERISTICS (VCC = 5.0 V, TA = 25°C)
Limits
Symbol
Parameter
Min Typ Max
tPHL
Propagation Delay Time, HIGH-to-LOW
Level Output from A Input
100
tPLH
Propagation Delay Time, LOW-to-HIGH
Level Output from A Input
100
tPHL
Propagation Delay Time, HIGH-to-LOW
Level Output from RBI Input
100
tPLH
Propagation Delay Time, LOW-to-HIGH
Level Output from RBI Input
100
Unit
ns
ns
ns
ns
Test Conditions
CL = 15 pF, RL = 4.0 k
CL = 15 pF, RL = 6.0 k
FAST AND LS TTL DATA
5-61







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)