background image

  SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258

QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

 

SDAS124C – APRIL 1982 – REVISED AUGUST 1996

1

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

D

3-State Outputs Interface Directly With

System Bus

D

Provide Bus Interface From Multiple

Sources in High-Performance Systems

D

Package 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

OE

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

H

X

L

L

H

L

H

X

H

H

L

Copyright 

©

 1996, 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.

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

V

CC

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

3

2 1 20 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

V

CC

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.

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SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258

QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

 

SDAS124C – APRIL 1982 – REVISED AUGUST 1996

2

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

logic symbols

OE

MUX

2

1A

1

3

1B

EN

15

G1

1

1Y

4

5

2A

6

2B

2Y

7

11

3A

10

3B

3Y

9

14

4A

13

4B

4Y

12

A /B

1

 

 

OE

MUX

2

1A

1

3

1B

EN

15

G1

1

1Y

4

5

2A

6

2B

2Y

7

11

3A

10

3B

3Y

9

14

4A

13

4B

4Y

12

A /B

1

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)

4Y

3Y

2Y

1Y

A/B

OE

4B

4A

3B

3A

2B

2A

1B

1A

4

2

3

7

5

6

9

11

10

12

14

13

1

15

4Y

3Y

2Y

1Y

A /B

OE

4B

4A

3B

3A

2B

2A

1B

1A

4

2

3

7

5

6

9

11

10

12

14

13

1

15

SN54ALS257A, SN74ALS257A,

SN74AS257

SN54ALS258A, SN74ALS258A,

SN74AS258

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

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SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258

QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

 

SDAS124C – APRIL 1982 – REVISED AUGUST 1996

3

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

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

Supply voltage, V

CC

 

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Input voltage, V

I

 

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Voltage applied to a disabled 3-state output 

5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Maximum power dissipation at T

A

 = 55

°

C (in still air) (see Note 1): D package 

1.3 W

. . . . . . . . . . . . . . . . . . . 

N package 

1.1 W

. . . . . . . . . . . . . . . . . . . 

Operating free-air temperature range, T

A

: SN54ALS257A, SN54ALS258A 

–55

°

C to 125

°

C

. . . . . . . . . . . . . . 

SN74ALS257A, SN74ALS258A 

0

°

C to 70

°

C

. . . . . . . . . . . . . . . . . 

Storage temperature range, T

stg

 –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

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

background image

SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258

QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

 

SDAS124C – APRIL 1982 – REVISED AUGUST 1996

4

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54ALS257A

SN54ALS258A

SN74ALS257A

SN74ALS258A

UNIT

MIN

TYP†

MAX

MIN

TYP†

MAX

VIK

VCC = 4.5 V,

II = –18 mA

–1.5

–1.5

V

VCC = 4.5 V to 5.5 V,

IOH = –0.4 mA

VCC–2

VCC–2

VOH

VCC = 4 5 V

IOH = –1 mA

2.4

3.3

V

VCC = 4.5 V

IOH = –2.6 mA

2.4

3.2

VOH

VCC = 4 5 V

IOL = 12 mA

0.25

0.4

0.25

0.4

V

VOH

VCC = 4.5 V

IOL = 24 mA

0.35

0.5

V

IOZH

VCC = 5.5 V,

VO = 2.7 V

20

20

µ

A

IOZL

VCC = 5.5 V,

VO = 0.4 V

–20

–20

µ

A

II

VCC = 5.5 V,

VI = 7 V

0.1

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

20

20

µ

A

IIL

VCC = 5.5 V,

VI = 0.4 V

–0.1

–0.1

mA

IO‡

VCC = 5.5 V,

VO = 2.25 V

–20

–112

–30

–112

mA

SN54ALS257A

Outputs high

3

8

3

6

SN54ALS257A,

SN74ALS257A

VCC = 5.5 V

Outputs low

8

12

8

12

ICC

SN74ALS257A

Outputs disabled

9

14

9

14

mA

ICC

SN54ALS258A

Outputs high

2.5

5

2.5

4

mA

SN54ALS258A,

SN74ALS258A

VCC = 5.5 V

Outputs low

7

11

7

11

SN74ALS258A

Outputs disabled

8

13

8

13

† All typical values are at VCC = 5 V, TA = 25

°

C.

‡ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.

switching characteristics (see Figure 1)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

R1 = 500 

,

R2 = 500 

,

TA = MIN to MAX§

UNIT

SN54ALS257A

SN74ALS257A

MIN

MAX

MIN

MAX

tPLH

A or B

Any Y

2

12

2

10

ns

tPHL

A or B

Any Y

2

14

2

12

ns

tPLH

A /B

Any Y

4

21

6

18

ns

tPHL

A /B

Any Y

6

25

6

22

ns

tPZH

OE

Any Y

3

20

4

16

ns

tPZL

OE

Any Y

4

22

5

18

ns

tPHZ

OE

Any Y

2

12

2

10

ns

tPLZ

OE

Any Y

2

35

4

15

ns

§ For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.

background image

SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258

QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

 

SDAS124C – APRIL 1982 – REVISED AUGUST 1996

5

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

switching characteristics (see Figure 1)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

R1 = 500 

,

R2 = 500 

,

TA = MIN to MAX†

UNIT

SN54ALS258A

SN74ALS258A

MIN

MAX

MIN

MAX

tPLH

A or B

Any Y

1

12

2

8

ns

tPHL

A or B

Any Y

2

9

2

7

ns

tPLH

A /B

Any Y

4

28

5

25

ns

tPHL

A /B

Any Y

5

25

6

20

ns

tPZH

OE

Any Y

3

20

4

18

ns

tPZL

OE

Any Y

5

21

5

18

ns

tPHZ

OE

Any Y

2

12

2

10

ns

tPLZ

OE

Any Y

3

37

4

18

ns

† For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.

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

Supply voltage, V

CC

 

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Input voltage, V

I

 

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Voltage applied to a disabled 3-state output 

5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Maximum power dissipation at T

A

 = 55

°

C (in still air) (see Note 1): D package 

1.3 W

. . . . . . . . . . . . . . . . . . . 

N package 

1.1 W

. . . . . . . . . . . . . . . . . . . 

Operating free-air temperature range, T

A

: SN74AS257, SN74AS258 

0

°

C to 70

°

C

. . . . . . . . . . . . . . . . . . . . . . 

Storage temperature range, T

stg

 –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

SN74AS257

SN74AS258

UNIT

MIN

NOM

MAX

VCC

Supply voltage

4.5

5

5.5

V

VIH

High-level input voltage

2

V

VIL

Low-level input voltage

0.8

V

IOH

High-level output current

– 15

mA

IOL

Low-level output current

48

mA

TA

Operating free-air temperature

0

70

°

C

background image

SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258

QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

 

SDAS124C – APRIL 1982 – REVISED AUGUST 1996

6

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

SN74AS257

SN74AS258

UNIT

MIN

TYP†

MAX

VIK

VCC = 4.5 V,

II = –18 mA

–1.2

V

VOH

VCC = 4.5 V to 5.5 V,

IOH = –2 mA

VCC – 2

V

VOH

VCC = 4.5 V,

IOH = –15 mA

2.4

3.2

V

VOL

VCC = 4.5 V,

IOL = 48 mA

0.35

0.5

V

IOZH

VCC = 5.5 V,

VO = 2.7 V

50

µ

A

IOZL

VCC = 5.5 V,

VO = 0.4 V

–50

µ

A

II

A, B, or OE

VCC = 5 5 V

VI = 7 V

0.1

mA

II

A/B

VCC = 5.5 V,

VI = 7 V

0.2

mA

IIH

A, B, or OE

VCC = 5 5 V

VI = 2 7 V

20

µ

A

IIH

A/B

VCC = 5.5 V,

VI = 2.7 V

40

µ

A

IIL

A, B, or OE

VCC = 5 5 V

VI = 0 4 V

–0.5

mA

IIL

A/B

VCC = 5.5 V,

VI = 0.4 V

–1

mA

IO‡

VCC = 5.5 V,

VO = 2.25 V

–30

–112

mA

Outputs high

12.1

19.7

SN74AS257

VCC = 5.5 V

Outputs low

19

30.6

ICC

Outputs disabled

19.7

31.9

mA

ICC

Outputs high

8.4

13.5

mA

SN74AS258

VCC = 5.5 V

Outputs low

15.2

24.6

Outputs disabled

15.5

25.2

† All typical values are at VCC = 5 V, TA = 25

°

C.

‡ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.

background image

SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258

QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

 

SDAS124C – APRIL 1982 – REVISED AUGUST 1996

7

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

switching characteristics (see Figure 1)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

R1 = 500 

,

R2 = 500 

,

TA = MIN to MAX†

UNIT

SN74AS257

MIN

MAX

tPLH

A or B

Any Y

1

5.5

ns

tPHL

A or B

Any Y

1

6

ns

tPLH

A /B

Any Y

2

11

ns

tPHL

A /B

Any Y

2

10

ns

tPZH

OE

Any Y

2

7.5

ns

tPZL

OE

Any Y

2

9.5

ns

tPHZ

OE

Any Y

1.5

6.5

ns

tPLZ

OE

Any Y

2

7

ns

switching characteristics (see Figure 1)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

R1 = 500 

,

R2 = 500 

,

TA = MIN to MAX†

UNIT

SN74AS258

MIN

MAX

tPLH

A or B

Any Y

1

5

ns

tPHL

A or B

Any Y

1

4

ns

tPLH

A /B

Any Y

2

9.5

ns

tPHL

A /B

Any Y

2

10

ns

tPZH

OE

Any Y

2

8

ns

tPZL

OE

Any Y

2

10

ns

tPHZ

OE

Any Y

1.5

6

ns

tPLZ

OE

Any Y

2

6.5

ns

† For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.

background image

SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258

QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

 

SDAS124C – APRIL 1982 – REVISED AUGUST 1996

8

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

SERIES 54ALS/ 74ALS AND 54AS/ 74AS DEVICES

tPHZ

tPLZ

tPHL

tPLH

0.3 V

tPZL

tPZH

tPLH

tPHL

LOAD CIRCUIT

FOR 3-STATE OUTPUTS

From Output

Under Test

Test 

Point

R1

S1

CL

(see Note A)

7 V

1.3 V

1.3 V

3.5 V

3.5 V

0.3 V

0.3 V

High-Level

Pulse

Low-Level

Pulse

tw

VOLTAGE WAVEFORMS

PULSE DURATIONS

Input

Out-of-Phase

Output

(see Note C)

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

3.5 V

3.5 V

0.3 V

0.3 V

VOL

VOH

VOH

VOL

Output

Control

(low-level

enabling)

Waveform 1

S1 Closed

(see Note B)

Waveform 2

S1 Open

(see Note B)

[

0 V

VOH

VOL

[

3.5 V

In-Phase

Output

0.3 V

1.3 V

1.3 V

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS

R2

RL = R1 = R2

NOTES: A. CL includes probe and jig capacitance.

B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

C. When measuring propagation delay items of 3-state outputs, switch S1 is open.

D. All input pulses have the following characteristics: PRR 

 1 MHz, tr = tf = 2 ns, duty cycle = 50%.

E. The outputs are measured one at a time with one transition per measurement.

Figure 1. Load Circuits and Voltage Waveforms

background image

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Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue

any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

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DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL

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