5-1

FAST AND LS TTL DATA

OCTAL BUFFER/LINE DRIVER

WITH 3-STATE OUTPUTS

The SN54 / 74LS540 and SN54 / 74LS541 are octal buffers and line drivers

with the same functions as the LS240 and LS241, but with pinouts on the

opposite side of the package.

These device types are designed to be used as memory address drivers,

clock drivers and bus-oriented transmitters / receivers. These devices are

especially useful as output ports for the microprocessors, allowing ease of

layout and greater PC board density.

Interface to Microprocessors

LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW)

18

17

16

15

14

13

12

3

4

5

6

7

20

19

8

VCC

910

GND

12

11

SN54 / 74LS540

SN54 / 74LS541

18

17

16

15

14

13

12

3

4

5

6

7

20

19

8

VCC

910

GND

12

11

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54

74

4.5

4.75

5.0

5.0

5.5

5.25

V

TA

Operating Ambient Temperature Range

54

74

–55

0

25

25

125

70

°C

IOH

Output Current — High

54

74

–12

–15

mA

IOL

Output Current — Low

54

74

12

24

mA

SN54/74LS540

SN54/74LS541

OCTAL BUFFER / LINE DRIVER

WITH 3-STATE OUTPUTS

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXDW SOIC

20

1

J SUFFIX

CERAMIC

CASE 732-03

20

1

N SUFFIX

PLASTIC

CASE 738-03

20

1

DW SUFFIX

SOIC

CASE 751D-03