Motorola SN54LS247J, SN54LS248J, SN54LS249J, SN74LS247DW, SN74LS247N Datasheet

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

			J SUFFIX
			CERAMIC
			CASE 620-09
16	1
			N SUFFIX
			PLASTIC
16			CASE 648-08
	1
			D SUFFIX
	16		SOIC
			CASE 751B-03
		1

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

f g b

e c

d

SEGMENT

IDENTIFICATION

FAST AND LS TTL DATA

5-402

SN54/74LS247 •SN54/74LS248 •SN54/74LS249

	SN54 / 74LS248
SN54 / 74LS247	SN54 / 74LS259
(TOP VIEW)	(TOP VIEW)

															OUTPUTS
	VCC				f			g						a					b							c				d				e
	16		15					14						13				12								11				10				9

f g a b c d e

BI/

B C LT RBORBI D A

1

2

3

4

5

6

7

8

B

C

LAMP

RB

RB

D

A

GND

TEST

OUT

IN

INPUTS

PUT

PUT

INPUTS

OUTPUTS

VCC

f

g

a

b

c

d

e

16

15

14

13

12

11

10

9

f

g

a b

c d

e

BI/

B

C LT RBORBI D

A

1

2

3

4

5

6

7

8

B

C

LAMP

RB

RB

D

A

GND

TEST

OUT

IN

INPUTS

PUT

PUT

INPUTS

ALL CIRCUIT TYPES FEATURE LAMP INTENSITY MODULATION CAPABILITY

			DRIVER OUTPUTS			TYPICAL
	TYPE	ACTIVE	OUTPUT	SINK	MAX	POWER
						DISSIPATION
		LEVEL	CONFIGURATION	CURRENT	VOLTAGE
	SN54LS247	low	open-collector	12 mA	15 V	35 mW
	SN54LS248	high	2.0 kΩ pull-up	2.0 mA	5.5 V	125 mW
	SN54LS249	high	open-collector	4.0 mA	5.5 V	40 mW
	SN74LS247	low	open-collector	24 mA	15 V	35 mW
	SN74LS248	high	2.0 kΩ pull-up	6.0 mA	5.5 V	125 mW
	SN74LS249	high	open-collector	8.0 mA	5.5 V	40 mW

	LS247
INPUT	(7)
A
INPUT	(1)
B
INPUT	(2)
C
INPUT	(6)
D
BI/RBO
BLANKING	(4)
INPUT OR
RIPPLE(BLANKING
OUTPUT
LAMP TEST(3)
INPUT
RBI	(5)
RIPPLE(BLANKING
INPUT

	LOGIC DIAGRAM
				LS248, LS249
(13) OUTPUT				(13) OUTPUT
	a				a
		INPUT	(7)
(12) OUTPUT		A
		INPUT	(1)	(12) OUTPUT
	b	B			b
(11) OUTPUT		INPUT	(2)	(11)	OUTPUT
	c	C
					c
(10)	OUTPUT	INPUT	(6)	(10)
		D			OUTPUT
	d
					d
(9)	OUTPUT	BLANKING	(4)	(9)	OUTPUT
	e	INPUT OR
		RIPPLE(BLANKING			e
(15) OUTPUT		OUTPUT
				(15) OUTPUT
	f				f
		LAMP TEST(3)
(14) OUTPUT
		INPUT	(5)	(14)	OUTPUT
	g	RIPPLE(BLANKING
					g
		INPUT

FAST AND LS TTL DATA

5-403

SN54/74LS247 •SN54/74LS248 •SN54/74LS249

LS247

FUNCTION TABLE

DECIMAL

INPUTS

OUTPUTS

OR

BI/RBO

NOTE

FUNCTION

LT

RBI

D

C

B

A

a

b

c

d

e

f

g

0

H

H

L

L

L

L

H

ON

ON

ON

ON

ON

ON

OFF

1

H

X

L

L

L

H

H

OFF

ON

ON

OFF

OFF

OFF

OFF

2

H

X

L

L

H

L

H

ON

ON

OFF

ON

ON

OFF

ON

3

H

X

L

L

H

H

H

ON

ON

ON

ON

OFF

OFF

ON

4

H

X

L

H

L

L

H

OFF

ON

ON

OFF

OFF

ON

ON

5

H

X

L

H

L

H

H

ON

OFF

ON

ON

OFF

ON

ON

6

H

X

L

H

H

L

H

ON

OFF

ON

ON

ON

ON

ON

7

H

X

L

H

H

H

H

ON

ON

ON

OFF

OFF

OFF

OFF

1

8

H

X

H

L

L

L

H

ON

ON

ON

ON

ON

ON

ON

9

H

X

H

L

L

H

H

ON

ON

ON

ON

OFF

ON

ON

10

H

X

H

L

H

L

H

OFF

OFF

OFF

ON

ON

OFF

ON

11

H

X

H

L

H

H

H

OFF

OFF

ON

ON

OFF

OFF

ON

12

H

X

H

H

L

L

H

OFF

ON

OFF

OFF

OFF

ON

ON

13

H

X

H

H

L

H

H

ON

OFF

OFF

ON

OFF

ON

ON

14

H

X

H

H

H

L

H

OFF

OFF

OFF

ON

ON

ON

ON

15

H

X

H

H

H

H

H

OFF

OFF

OFF

OFF

OFF

OFF

OFF

BI

X

X

X

X

X

X

L

OFF

OFF

OFF

OFF

OFF

OFF

OFF

2

RBI

H

L

L

L

L

L

L

OFF

OFF

OFF

OFF

OFF

OFF

OFF

3

LT

L

X

X

X

X

X

H

ON

ON

ON

ON

ON

ON

ON

4

LS248, LS249

FUNCTION TABLE

DECIMAL

INPUTS

OUTPUTS

OR

BI/RBO

NOTE

FUNCTION

LT

RBI

D

C

B

A

a

b

c

d

e

f

g

0

H

H

L

L

L

L

H

H

H

H

H

H

H

L

1

1

H

X

L

L

L

H

H

L

H

H

L

L

L

L

1

2

H

X

L

L

H

L

H

H

H

L

H

H

L

H

3

H

X

L

L

H

H

H

H

H

H

H

L

L

H

4

H

X

L

H

L

L

H

L

H

H

L

L

H

H

5

H

X

L

H

L

H

H

H

L

H

H

L

H

H

6

H

X

L

H

H

L

H

H

L

H

H

H

H

H

7

H

X

L

H

H

H

H

H

H

H

L

L

L

L

1

8

H

X

H

L

L

L

H

H

H

H

H

H

H

H

9

H

X

H

L

L

H

H

H

H

H

H

L

H

H

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

X

X

L

L

L

L

L

L

L

L

2

RBI

H

L

L

L

L

L

L

L

L

L

L

L

L

L

3

LT

L

X

X

X

X

X

H

H

H

H

H

H

H

H

4

H = HIGH Level, L = LOW Level, X = Irrelevant

NOTES: 1. The blanking input (BI) must be open or held at a high logic level when output functions 0 through 15 are desired. The ripple-blanking input (RBI) must NOTES: 1. be open or high if blanking of a decimal zero is not desired.

2.When a low logic level is applied directly to the blanking input (BI), all segment outputs are off regardless of the level of any other input.

3.When ripple-blanking input (RBI) and inputs A, B, C, and D are at a low level with the lamp test input high, all segment outputs go off and the NOTES: 1. 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 high and a low is applied to the lamp-test input, all segment outputs are on.

BI/RBO is wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO).

FAST AND LS TTL DATA

5-404