5-403

FAST AND LS TTL DATA

SN54/74LS247

• SN54/74LS248 • SN54/74LS249

SN54 / 74LS247

(TOP VIEW)

14

13

12

11

10

9

1

2

3

4

5

6

7

16

15

8

VCC

B

f

g

a

b

d

c

e

C

LAMP

TEST

RB

OUT

PUT

RB

IN

PUT

D

A

GND

INPUTS

INPUTS

OUTPUTS

f g a b c d e

B C LT RBORBI D A

BI/

14

13

12

11

10

9

1

2

3

4

5

6

7

16

15

8

VCC

B

f

g

a

b

d

c

e

C

LAMP

TEST

RB

OUT

PUT

RB

IN

PUT

D

A

GND

INPUTS

INPUTS

OUTPUTS

f g a b c d e

B C LT RBORBI D A

BI/

SN54 / 74LS248

SN54 / 74LS259

(TOP VIEW)

ALL CIRCUIT TYPES FEATURE LAMP INTENSITY MODULATION CAPABILITY

DRIVER OUTPUTS

TYPICAL

POWER

DISSIPATION

TYPE

ACTIVE

LEVEL

OUTPUT

CONFIGURATION

SINK

CURRENT

MAX

VOLTAGE

TYPICAL

POWER

DISSIPATION

SN54LS247

low

open-collector

12 mA

15 V

35 mW

SN54LS248

high

2.0 k

Ω 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 k

Ω pull-up

6.0 mA

5.5 V

125 mW

SN74LS249

high

open-collector

8.0 mA

5.5 V

40 mW

INPUT

A

(7)

INPUT

B

INPUT

C

(1)

(2)

(6)

INPUT

D

(4)

BI/RBO

BLANKING

INPUT OR

RIPPLEBLANKING

OUTPUT

LAMP TEST

INPUT

(3)

RBI

RIPPLEBLANKING

INPUT

(5)

OUTPUT

(13)

a

(12) OUTPUT

b

(11) OUTPUT

c

(10) OUTPUT

d

(9)

OUTPUT

e

(15) OUTPUT

f

(14) OUTPUT

g

INPUT

A

(7)

INPUT

B

INPUT

C

(1)

(2)

(6)

INPUT

D

(4)

BLANKING

INPUT OR

RIPPLEBLANKING

OUTPUT

LAMP TEST

INPUT

(3)

RIPPLEBLANKING

INPUT

(5)

OUTPUT

(13)

a

(12) OUTPUT

b

(11) OUTPUT

c

(10) OUTPUT

d

(9)

OUTPUT

e

(15) OUTPUT

f

(14) OUTPUT

g

LOGIC DIAGRAM

LS247

LS248, LS249