Texas Instruments SN74ALS257AN Bruksanvisning

Texas Instruments Inte kategoriserad SN74ALS257AN

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     

    

  

SDAS124C − APRIL 1982 − REVISED AUGUST 1996

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 SN74AS258 are characterized for operation

from 0°C to 70°C.

FUNCTION TABLE

INPUTS OUTPUT Y

A /B

DATA SN54ALS257A

SN74ALS257A

SN54ALS258A

SN74ALS258A

OE A /B A B

SN74ALS257A

SN74AS257

SN74ALS258A

SN74AS258

H X X X Z Z

L L L X L H

L L H X H L

L HH X L L

L H X H H L

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"!-('%& '!!"# %! &*)''$%!& *)" %/) %)"#& ! )0$& &%"(#)%&

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%)&%3 ! $,, *$"$#)%)"&.

A/B

GND

VCC

SN54ALS257A, SN54ALS258A . . . J PACKAGE

SN74ALS257A, SN74ALS258A, SN74AS257,

SN74AS258 . . . D OR N PACKAGE

(TOP VIEW)

SN54ALS257A, SN54ALS258A . . . FK PACKAGE

(TOP VIEW)

NC − No internal connection

3 2 1 20 19

9 10 11 12 13

A/B

3B OE

GND

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.

    

  

SDAS124C − APRIL 1982 − REVISED AUGUST 1996

2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443

logic symbols†

MUX

2B 2Y

3A 10

3B 3Y

4A 13

4B 4Y

A /B

MUX

2B 2Y

3A 10

3B 3Y

4A 13

4B 4Y

A /B

SN54ALS257A, SN74ALS257A,

SN74AS257

SN54ALS258A, SN74ALS258A,

SN74AS258

†These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

Pin numbers shown are for the D, J, and N packages.

logic diagrams (positive logic)

A/B

1A 4

A /B

1A 4

SN54ALS257A, SN74ALS257A,

SN74AS257

SN54ALS258A, SN74ALS258A,

SN74AS258

Pin numbers shown are for the D, J, and N packages.

    

  

SDAS124C − APRIL 1982 − REVISED AUGUST 1996

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

absolute maximum ratings over operating free-air temperature range (unless otherwise noted) †

Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage, VI 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum power dissipation at TA = 55°C (in still air) (see Note 1): D package 1.3 W. . . . . . . . . . . . . . . . . . .

N package 1.1 W. . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, TA : SN54ALS257A, SN54ALS258A −55° °C to 125 C. . . . . . . . . . . . . .

SN74ALS257A, SN74ALS258A 0° °C to 70 C. . . . . . . . . . . . . . . . .

Storage temperature range, Tstg −65° °C to 150 C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils,

except for the N package, which has a trace length of zero.

recommended operating conditions

SN54ALS257A

SN54ALS258A

SN74ALS257A

SN74ALS258A

UNIT

MIN NOM MAX MIN NOM MAX

UNIT

VCC Supply voltage 4.5 5 5.5 4.5 5 5.5 V

VIH High-level input voltage 2 2 V

VIL Low-level input voltage 0.7 0.8 V

IOH High-level output current −1 −2.6 mA

IOL Low-level output current 12 24 mA

TA Operating free-air temperature −55 125 0 70 C°

Produktspecifikationer

Varumärke:	Texas Instruments
Kategori:	Inte kategoriserad
Modell:	SN74ALS257AN
Färg på produkten:	Zwart
Vikt:	19000 g
Mått (B x D x H):	435 x 310 x 445 mm
Volym man:	26 l
Arbetsbredd:	- mm
Strimla papper:	Ja
Stimling av kreditkort:	Ja
Dokumentförstörarens kapacitet:	100 vel
Typ av förstörare:	Confetti-versnippering
Bearbetar häftklamrar:	Ja
Bearbetar gem:	Ja
Mandcapaciteit:	200 vel
Autostopp om det fastnar:	Ja