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PDF SN74LS247 Data sheet ( Hoja de datos )
| Número de pieza | SN74LS247 | |
| Descripción | BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SN74LS247 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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BCD-TO-SEVEN-SEGMENT
DECODERS/DRIVERS
The SN54/74LS247 thru SN54/74LS249 are BCD-to-Seven-Segment
Decoder/Drivers.
The LS247 and LS248 are functionally and electrically identical to the LS47
and LS48 with the same pinout configuration. The LS249 is a 16-pin version
of the 14-pin LS49 and includes full functional capability for lamp test and
ripple blanking which was not available in the LS49.
The composition of all characters, except the 6 and 9 are identical between
the LS247, 248, 249 and the LS47, 48 and 49. The LS47 thru 49 compose
the and without tails, the LS247 thru 249 compose the and with
the tails. The LS247 has active-low outputs for direct drive of indicators. The
LS248 and 249 have active-high outputs for driving lamp buffers.
All types feature a lamp test input and have full ripple-blanking input/output
controls. On all types an automatic leading and/or trailing-edge zero-blanking
control (RBI and RBO) is incorporated and an overriding blanking input (BI)
is contained which may be used to control the lamp intensity by pulsing or to
inhibit the output’s lamp test may be performed at any time when the BI/RBO
node is at high level. Segment identification and resultant displays are shown
below. Display pattern for BCD input counts above 9 are unique symbols to
authenticate input conditions.
LS247
• Open-Collector Outputs Drive Indicators Directly
• Lamp-Test Provision
• Leading / Trailing Zero Suppression
LS248
• Internal Pull-Ups Eliminate Need for External Resistors
• Lamp-Test Provision
• Leading / Trailing Zero Suppression
LS249
• Open-Collector Outputs
• Lamp-Test Provision
• Leading / Trailing Zero Suppression
SN54/74LS247
SN54/74LS248
SN54/74LS249
BCD-TO-SEVEN-SEGMENT
DECODERS/ DRIVERS
LOW POWER SCHOTTKY
16
1
16
1
16
1
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
NUMERICAL DESIGNATIONS AND RESULTANT DISPLAYS
a
fgb
ec
d
SEGMENT
IDENTIFICATION
FAST AND LS TTL DATA
5-402
1 page  
SN54 / 74LS248
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA Operating Ambient Temperature Range
IOH Output Current — High BI / RBO
Output Current — High a – g
IOL Output Current — Low BI / RBO
Output Current — Low BI / RBO
Output Current — Low a – g
Output Current — Low a – g
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
– 50 µA
54, 74
– 100
54 1.6 mA
74 3.2
54 2.0
74 6.0
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
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
a – g and BI / RBO
54
74
– 0.65 – 1.5
2.4 4.2
2.4 4.2
V VCC = MIN, IIN = – 18 mA
V VCC = MIN, IOH = MAX, VIN = VIH
V or VIL per Truth Table
IOH
VOL
IIH
IIL
Output Current
a–g
Output LOW Voltage
a–g
BI / RBO
54, 74 – 1.3
54, 74
74
54, 74
74
Input HIGH Current
Any Input, except BI/ RBO
Input LOW Current
Any Input, except BI/ RBO
BI / RBO
– 2.0
0.25
0.35
0.25
0.35
0.4
0.5
0.4
0.5
20
0.1
– 0.4
– 1.2
mA
VCC = MIN, VO = 0.85 V,
Input Conditions as for VOH
V IOL = 2.0 mA
IOL = 6.0 mA
IOL = 1.6 mA
V
IOL = 3.2 mA
VCC = MIN, VIH = 2.0 V,
VIL = per Truth Table
µA VCC = MAX, VIN = 2.7 V
mA VCC = MAX, VIN = 7.0 V
mA VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current
BI / RBO (Note 1)
– 0.3
– 2.0 mA VCC = MAX
ICC Power Supply Current
25 38
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)
Symbol
tPLH
tPHL
tPHL
tPLH
Parameter
Propagation Delay Time, High-to-Low-Level Output from A Input
Propagation Delay Time, Low-to-High-Level Output from A Input
Propagation Delay Time, High-to-Low-Level Output from RBI Input
Propagation Delay Time, Low-to-High-Level Output from RBI Input
Limits
Min Typ Max
100
100
100
100
Unit
ns
ns
Test Conditions
CL = 15 pF
RL = 4.0 kΩ
CL = 15 pF
RL = 6.0 kΩ
FAST AND LS TTL DATA
5-406
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SN74LS247.PDF ] | |
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