SN54LS240, SN54LS241, SN54LS244, SN54S240, SN54S241, SN54S244

SN74LS240, SN74LS241, SN74LS244, SN74S240, SN74S241, SN74S244

OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS

SDLS144B – APRIL 1985 – REVISED FEBRUARY 2002

1

POST OFFICE BOX 655303

Memory Address Registers

Margins

description

These octal buffers and line drivers are designed

specifically to improve both the performance and

density of three-state memory address drivers,

clock drivers, and bus-oriented receivers and

transmitters. The designer has a choice of

selected

combinations

of

inverting

and

noninverting outputs, symmetrical, active-low

output-control (G) inputs, and complementary

output-control (G and G) inputs. These devices

feature high fan-out, improved fan-in, and 400-mV

noise margin. The SN74LS’ and SN74S’ devices

can be used to drive terminated lines down to

133

Ω.

Copyright

 2002, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

1G

1A1

2Y4

1A2

2Y3

1A3

2Y2

1A4

2Y1

GND

1Y1

2A4

1Y2

2A3

1Y3

2A2

1Y4

2A1

SN54LS’, SN54S’ ...J OR W PACKAGE

SN74LS240, SN74LS244 . . . DB, DW, N, OR NS PACKAGE

SN74LS241 ...DW, N, OR NS PACKAGE

SN74S’ . . . DW OR N PACKAGE

(TOP VIEW)

3

2

1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

1Y1

2A4

1Y2

2A3

1Y3

1A2

2Y3

1A3

2Y2

1A4

SN54LS’, SN54S’ . . . FK PACKAGE

(TOP VIEW)

† 2G for ’LS241 and ’S241 or 2G for all other drivers.

† 2G for ’LS241 and ’S241 or 2G for all other drivers.

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.