Datasheet sn74f257 Datasheet

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SN54F257, SN74F257

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

WITH 3-STATE OUTPUTS

SDFS065A – D2932, MARCH 1987 – REVISED OCTOBER 1993

• 3-State Outputs Interface Directly With

System Bus

• Provides Bus Interface From Multiple

Sources in High-Performance Systems

• Package Options Include Plastic

Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs

description

The ′F257 is designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs will not load the data lines when the output enable (OE

) input is at a high logic level.

The SN54F257 is characterized for operation over the full military temperature range of –55°C to 125°C. The SN74F257 is characterized for operation from 0°C to 70°C.

FUNCTION TABLE

INPUTS

OE A/B A B

H X X X Z

L LLX L LLHX H LHXL L LHXH H

OUTPUT

SN54F257 ...J PACKAGE

SN74F257 ...D OR N PACKAGE

SN54F257 . . . FK PACKAGE

1B 1Y

2A 2B

NC – No internal connection

(TOP VIEW)

A/B

1A 1B 1Y 2A 2B 2Y

GND

(TOP VIEW)

3212019

4 5 6 7 8

910111213

1 2 3 4 5 6 7 8

A/B

GND

16 15 14 13 12 11 10

OE 4A 4B 4Y 3A 3B 3Y

logic symbol

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

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

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.

†

A/B

1A 1B 2A 2B 3A 3B 4A 4B

15 1

2 3 5 6 11 10 14 13

EN G1

1 1

MUX

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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SN54F257, SN74F257 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS

SDFS065A – D2932, MARCH 1987 – REVISED OCT OBER 1993

logic diagram (positive logic)

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

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

Supply voltage range, V

Input voltage range (see Note 1) –1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input current range –30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the disabled or power-off state –0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the high state –0.5 V to V

Current into any output in the low state: SN54F257 40 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54F257 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range –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 input voltage ratings may be exceeded provided the input current ratings are observed.

–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

SN74F257 48 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74F257 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

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SN54F257, SN74F257

UNIT

PARAMETER

TEST CONDITIONS

UNIT

4.5 V

See Note 2

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

WITH 3-STATE OUTPUTS

SDFS065A – D2932, MARCH 1987 – REVISED OCTOBER 1993

recommended operating conditions

SN54F257 SN74F257

MIN NOM MAX MIN NOM MAX

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

†

All typical values are at VCC = 5 V, TA = 25°C.

‡

Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.

NOTE 2: ICC is measured with the outputs open under the following conditions:

Supply voltage 4.5 5 5.5 4.5 5 5.5 V High-level input voltage 2 2 V Low-level input voltage 0.8 0.8 V Input clamp current –18 –18 mA High-level output current –3 –3 mA Low-level output current 20 24 mA Operating free-air temperature –55 125 0 70 °C

SN54F257 SN74F257

MIN TYP†MAX MIN TYP†MAX

OZH

OZL

‡

CCH

CCL

CCZ

A. A

/B and all B inputs at 4.5 V, other inputs grounded B. All B inputs at 4.5 V, other inputs grounded C. OE

VCC = 4.5 V, II = –18 mA –1.2 –1.2 V

VCC = 4.75 V, IOH = – 1 mA to –3 mA 2.7

= 4.5

VCC = 5.5 V, VO = 2.7 V 50 50 µA VCC = 5.5 V, VO = 0.5 V –50 –50 µA VCC = 5.5 V, VI = 7 V 0.1 0.1 mA VCC = 5.5 V, VI = 2.7 V 20 20 µA VCC = 5.5 V, VI = 0.5 V – 0.6 – 0.6 mA VCC = 5.5 V, VO = 0 –60 –150 –60 –150 mA

= 5.5 V,

and all B data inputs at 4.5 V, other inputs grounded

IOH = – 1 mA 2.5 3.4 2.5 3.4 IOH = – 3 mA 2.4 3.3 2.4 3.3 V

IOL = 20 mA 0.3 0.5 IOL = 24 mA 0.35 0.5

Condition A 9 15 9 15 Condition B 14.5 22 14.5 22 Condition C 15 23 15 23

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SN54F257, SN74F257

A or B

Any Y

A/B

Any Y

QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS

SDFS065A – D2932, MARCH 1987 – REVISED OCT OBER 1993

switching characteristics (see Note 3)

VCC = 5 V, CL = 50 pF,

PARAMETER

PLH

PHL

PLH

PHL

PZH

PZL

PHZ

t † NOTE 3: Load circuits and waveforms are shown in Section 1.

PLZ

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

FROM

(INPUT)

(OUTPUT)

R1 = 500 Ω, R2 = 500 Ω, TA = 25°C

′F257 SN54F257 SN74F257

MIN TYP MAX MIN MAX MIN MAX

2.2 4.1 6 2.2 8 2.2 7

1.2 3.8 5.5 1 8 1.2 6.5

3.7 9.7 13 3.7 15.5 3.7 15

2.7 6.1 8.5 2.7 10.5 2.7 9.5

2.2 5.5 7.5 2.2 9.5 2.2 8.5

2.2 5.1 7.5 2.2 10 2.2 8.5

1.2 3.9 6 1.2 7 1.2 7

1.2 4.1 6 1.2 9.5 1.2 7

VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500Ω, R2 = 500 Ω, TA = MIN to MAX

†

UNIT

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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