SN74LS248

Manufacturer Part NumberSN74LS248
DescriptionBCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS
ManufacturerMotorola
SN74LS248 datasheet
 


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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
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
0
1
2
NUMERICAL DESIGNATIONS AND RESULTANT DISPLAYS
and
with
3
4
5
6
7
8
9
10
11
12
a
f
g
b
e
c
d
SEGMENT
IDENTIFICATION
FAST AND LS TTL DATA
5-402
SN54/74LS247
SN54/74LS248
SN54/74LS249
BCD-TO-SEVEN-SEGMENT
DECODERS/ DRIVERS
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
16
CASE 751B-03
1
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN
Plastic
SN74LSXXXDW SOIC
13
14
15

SN74LS248 Summary of contents

  • Page 1

    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 ...

  • Page 2

    ... B C LAMP TEST OUT IN PUT PUT INPUTS INPUTS ALL CIRCUIT TYPES FEATURE LAMP INTENSITY MODULATION CAPABILITY TYPE ACTIVE LEVEL SN54LS247 SN54LS248 SN54LS249 SN74LS247 SN74LS248 SN74LS249 LS247 (7) INPUT A (1) INPUT B (2) INPUT C (6) INPUT D BI/RBO BLANKING (4) INPUT OR RIPPLE BLANKING OUTPUT (3) LAMP TEST ...

  • Page 3

    SN54/74LS247 SN54/74LS248 SN54/74LS249 DECIMAL INPUTS OR OR FUNCTION FUNCTION LT RBI ...

  • Page 4

    GUARANTEED OPERATING RANGES Symbol Parameter V CC Supply Voltage T A Operating Ambient Temperature Range I OH Output Current — High BI / RBO I OL Output Current — Low BI / RBO V O(off) Off-State Output Voltage a – ...

  • Page 5

    GUARANTEED OPERATING RANGES Symbol Parameter V CC Supply Voltage T A Operating Ambient Temperature Range I OH Output Current — High BI / RBO OH Output Current — High a – g Output Current — Low BI / RBO I ...

  • Page 6

    GUARANTEED OPERATING RANGES Symbol Parameter V CC Supply Voltage T A Operating Ambient Temperature Range I OH Output Current — High BI / RBO I OL Output Current — Low BI / RBO Output Current — Low BI / RBO ...

  • Page 7

    G - 0.25 (0.010 - SEATING -T- PLANE 0.25 (0.010) ...

  • Page 8

    ... Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. All operating parameters, including “ ...