Használati útmutató Texas Instruments SN74ALS257AN

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  

SDAS124C − APRIL 1982 − REVISED AUGUST 1996

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

D3-State Outputs Interface Directly With

System Bus

DProvide Bus Interface From Multiple

Sources in High-Performance Systems

DPackage Options Include Plastic

Small-Outline (D) Packages, Ceramic Chip

Carriers (FK), and Standard Plastic (N) and

Ceramic (J) 300-mil DIPs

description

These data selectors/multiplexers are designed

to multiplex signals from 4-bit data sources to

4-output data lines in bus-organized systems. The

3-state outputs do not load the data lines when the

output-enable (OE) input is at a high logic level.

The SN54ALS257A and SN54ALS258A are

characterized for operation over the full military

temperature range of −55°C to 125°C. The

SN74ALS257A, SN74ALS258A, SN74AS257,

and SN74AS258are characterized for operation

from 0°C to 70°C.

FUNCTION TABLE

INPUTSOUTPUT Y

OE

A /B

DATA SN54ALS257A

SN74ALS257A

SN54ALS258A

SN74ALS258A

OEA /BA B

SN74ALS257A

SN74AS257

SN74ALS258A

SN74AS258

H X XXZZ

LLL XLH

LLH XHL

LHH XLL

LH X HHL

Copyright  1996, Texas Instruments Incorporated

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1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

A/B

1A

1B

1Y

2A

2B

2Y

GND

VCC

OE

4A

4B

4Y

3A

3B

3Y

SN54ALS257A, SN54ALS258A . . . J PACKAGE

SN74ALS257A, SN74ALS258A, SN74AS257,

SN74AS258 . . . D OR N PACKAGE

(TOP VIEW)

SN54ALS257A, SN54ALS258A . . . FK PACKAGE

(TOP VIEW)

NC − No internal connection

32120 19

9 10 11 12 13

4

5

6

7

8

18

17

16

15

14

4A

4B

NC

4Y

3A

1B

1Y

NC

2A

2B

1A

A/B

NC

3Y

3B OE

2Y

GND

NC

VCC

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.

Termékspecifikációk