SN54125, SN54126, SN54LS125A, SN54LS126A,

SN74125, SN74126, SN74LS125A, SN74LS126A

QUADRUPLE BUS BUFFERS WITH 3-STATE OUTPUTS

SDLS044A – DECEMBER 1983 – REVISED MARCH 2002

1

POST OFFICE BOX 655303

description

These bus buffers feature three-state outputs

that, when enabled, have the low impedance

characteristics of a TTL output with additional

drive capability at high logic levels to permit

driving heavily loaded bus lines without external

pullup resistors. When disabled, both output

transistors

are

turned

off,

presenting

a

high-impedance state to the bus so the output will

act neither as a significant load nor as a driver. The

’125 and ’LS125A devices’ outputs are disabled

when G is high. The ’126 and ’LS126A devices’

outputs are disabled when G is low.

The SN54125, SN54126, SN74125,

SN74126, and SN54LS126A are

obsolete and are no longer supplied.

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.

SN54125, SN54126, SN54LS125A,

SN54LS126A . . . J OR W PACKAGE

SN74125, SN74126 ...N PACKAGE

SN74LS125A, SN74LS126A . . . D, N, OR NS PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

14

13

12

11

10

9

8

1G, 1G*

1A

1Y

2G, 2G*

2A

2Y

GND

4G, 4G*

4A

4Y

3G, 3G*

3A

3Y

32

1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

4A

NC

4Y

NC

3G, 3G*

1Y

NC

2G, 2G*

NC

2A

SN54LS125A, SN54LS126A . . . FK PACKAGE

(TOP VIEW)

*G on ’125 and ’LS125A devices;

G on 126 and ’LS126A devices

NC – No internal connection

*G on ’125 and ’LS125A devices;

G on 126 and ’LS126A devices

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.