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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

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

A/B

DATA

SN54ALS257A

SN74ALS257A

SN54ALS258A

SN74ALS258A

OE A/B

SN74ALS257A

SN74AS257

SN74ALS258A

SN74AS258

H X X X Z Z

L LLXL H

L LHXH L

L HXLL H

L H X H H L

  !"#$%! & '("")% $& ! *(+,'$%! -$%).

"!-('%& '!!"# %! &*)''$%!& *)" %/) %)"#& ! )0$& &%"(#)%&

&%$-$"- 1$""$%2. "!-('%! *"!')&&3 -!)& !% )')&&$",2 ',(-)

%)&%3 ! $,, *$"$#)%)"&.

A/B

GND

SN54ALS257A, SN54ALS258A...J PACKAGE

SN74ALS257A, SN74ALS258A, SN74AS257,

SN74AS258 ...D OR N PACKAGE

(TOP VIEW)

SN54ALS257A, SN54ALS258A...FK PACKAGE

(TOP VIEW)

NC − No internal connection

3212019

910111213

A/B

GND

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.

Summary of content (22 pages)

PAGE 1
SDAS124C − APRIL 1982 − REVISED AUGUST 1996 D 3-State Outputs Interface Directly With A/B 1A 1B 1Y 2A 2B 2Y GND description These data selectors/multiplexers are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems.
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SDAS124C − APRIL 1982 − REVISED AUGUST 1996 logic symbols† SN54ALS257A, SN74ALS257A, SN74AS257 15 OE 1 A /B 1A 1B 2A 2B 3A 3B 4A 4B 15 EN OE G1 A /B 2 3 SN54ALS258A, SN74ALS258A, SN74AS258 1 MUX 1A 4 1Y 1 1B 5 2A 7 6 2Y 2B 11 3A 9 10 3Y 3B 14 4A 12 13 4Y 4B EN 1 G1 2 1 3 MUX 4 1 1Y 5 7 6 2Y 11 9 10 3Y 14 12 13 4Y †
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SDAS124C − APRIL 1982 − REVISED AUGUST 1996 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . .
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SDAS124C − APRIL 1982 − REVISED AUGUST 1996 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER SN54ALS257A SN54ALS258A TEST CONDITIONS MIN VIK VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = −18 mA IOH = −0.4 mA VCC = 4.5 V IOH = −1 mA IOH = −2.6 mA VOH VCC = 4.
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SDAS124C − APRIL 1982 − REVISED AUGUST 1996 switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) tPLH tPHL A or B Any Y tPLH tPHL A /B Any Y tPZH tPZL OE Any Y tPHZ tPLZ OE Any Y VCC = 4.5 V to 5.
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SDAS124C − APRIL 1982 − REVISED AUGUST 1996 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS SN74AS257 SN74AS258 MIN VIK VOH VOL IOZH IOZL VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = −18 mA IOH = −2 mA VCC = 4.5 V, VCC = 4.5 V, IOH = −15 mA IOL = 48 mA VCC = 5.5 V, VCC = 5.
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SDAS124C − APRIL 1982 − REVISED AUGUST 1996 switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) tPLH tPHL A or B Any Y tPLH tPHL A /B Any Y tPZH tPZL OE Any Y tPHZ tPLZ OE Any Y VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX† SN74AS257 MIN MAX 1 5.5 1 6 2 11 2 10 2 7.5 2 9.5 1.5 6.
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SDAS124C − APRIL 1982 − REVISED AUGUST 1996 PARAMETER MEASUREMENT INFORMATION SERIES 54ALS/74ALS AND 54AS/74AS DEVICES 7V RL = R1 = R2 S1 R1 CL (see Note A) 3.5 V High-Level Pulse Test Point From Output Under Test 1.3 V 0.3 V tw R2 3.5 V Low-Level Pulse 1.3 V 1.3 V 0.3 V LOAD CIRCUIT FOR 3-STATE OUTPUTS VOLTAGE WAVEFORMS PULSE DURATIONS 3.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com (4) 31-Oct-2013 There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.
PAGE 13
PACKAGE MATERIALS INFORMATION www.ti.com 12-Aug-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device SN74ALS257ADR Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant SOIC D 16 2500 330.0 16.4 6.5 10.3 2.1 8.0 16.0 Q1 SN74ALS257ANSR SO NS 16 2000 330.0 16.4 8.2 10.5 2.5 12.0 16.0 Q1 SN74ALS258ADR SOIC D 16 2500 330.0 16.4 6.5 10.3 2.1 8.0 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 12-Aug-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SN74ALS257ADR SOIC D 16 2500 333.2 345.9 28.6 SN74ALS257ANSR SO NS 16 2000 367.0 367.0 38.0 SN74ALS258ADR SOIC D 16 2500 333.2 345.9 28.6 SN74AS257NSR SO NS 16 2000 367.0 367.0 38.
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