Datasheet

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SN54AC245, SN74AC245

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCAS461F − FEBRUARY 1995 − REVISED OCTOBER 2003

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D 2-V to 6-V V

Operation

D Inputs Accept Voltages to 6 V

D Max t

of 7 ns at 5 V

description/ordering information

The ’AC245 octal bus transceivers are designed

for asynchronous two-way communication

between data buses. The control-function

implementation minimizes external timing

requirements.

When the output-enable (OE

) is low, the device

passes noninverted data from the A bus to the B

bus or from the B bus to the A bus, depending on

the logic level at the direction control (DIR) input.

A high on

OE disables the device so that the buses

are effectively isolated.

To ensure the high-impedance state during power

up or power down, OE should be tied to V

through a pullup resistor; the minimum value of

the resistor is determined by the current-sinking

capability of the driver.

ORDERING INFORMATION

PACKAGE

†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP − N Tube SN74AC245N SN74AC245N

SOIC DW

Tube SN74AC245DW

AC245

SOIC − DW

Tape and reel SN74AC245DWR

AC245

−40°C to 85°C

SOP − NS Tape and reel SN74AC245NSR AC245

40 C

85 C

SSOP − DB Tape and reel SN74AC245DBR AC245

TSSOP PW

Tube SN74AC245PW

AC245

TSSOP − PW

Tape and reel SN74AC245PWR

AC245

CDIP − J Tube SNJ54AC245J SNJ54AC245J

−55°C to 125°C

CFP − W Tube SNJ54AC245W SNJ54AC245W

55 C

125 C

LCCC − FK Tube SNJ54AC245FK SNJ54AC245FK

†

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are

available at www.ti.com/sc/package.

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.

SN54AC245 . . . J OR W PACKAGE

SN74AC245 . . . DB, DW, N, NS, OR PW PACKAGE

(TOP VIEW)

3 2 1 20 19

9 10 11 12 13

SN54AC245...FK PACKAGE

(TOP VIEW)

DIR

B6 OE

GND

DIR

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.

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.

Summary of content (21 pages)

PAGE 1
SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461F − FEBRUARY 1995 − REVISED OCTOBER 2003 D 2-V to 6-V VCC Operation D Inputs Accept Voltages to 6 V D Max tpd of 7 ns at 5 V SN54AC245 . . . J OR W PACKAGE SN74AC245 . . . DB, DW, N, NS, OR PW PACKAGE (TOP VIEW) DIR A1 A2 A3 A4 A5 A6 A7 A8 GND description/ordering information The ’AC245 octal bus transceivers are designed for asynchronous two-way communication between data buses.
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SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461F − FEBRUARY 1995 − REVISED OCTOBER 2003 FUNCTION TABLE INPUTS OE DIR L L H L H X OPERATION B data to A bus A data to B bus Isolation logic diagram (positive logic) DIR 1 19 A1 OE 2 18 B1 To Seven Other Channels absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461F − FEBRUARY 1995 − REVISED OCTOBER 2003 recommended operating conditions (see Note 3) SN54AC245 VCC Supply voltage VCC = 3 V VIH High-level High level input voltage MIN MAX 2 6 Low-level Low level input voltage VI Input voltage VO Output voltage IOH IOL High-level High level output current Low-level Low level output current Dt/Dv Input transition rise or fall rate TA Operating free-air temperature MIN MAX 2 6
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SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461F − FEBRUARY 1995 − REVISED OCTOBER 2003 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS IOH = −50 50 mA IOH = −12 mA VOH IOH = −24 24 mA MIN TYP MIN MAX SN74AC245 MIN 3V 2.9 2.9 2.9 4.5 V 4.4 4.4 4.4 5.5 V 5.4 5.4 5.4 3V 2.56 2.4 2.46 4.5 V 3.86 3.7 3.76 5.5 V 4.86 4.7 4.76 MAX 5.5 V 5.5 V 3V 0.002 0.1 0.1 0.
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SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461F − FEBRUARY 1995 − REVISED OCTOBER 2003 switching characteristics over recommended operating free-air temperature range, VCC = 5 V " 5 V (unless otherwise noted) (see Figure 1) PARAMETER tPLH tPHL tPZH tPZL tPHZ tPLZ FROM (INPUT) TO (OUTPUT) A or B B or A OE A or B OE A or B TA = 25°C SN54AC245 SN74AC245 MIN TYP MAX MIN MAX MIN MAX 1.5 3.5 6.5 1 8.5 1 7 1.5 3.5 6 1 7.5 1 7 1.5 5 8.5 1 10 1 9 1.
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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 25-Sep-2013 (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device 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 SN74AC245DBR SSOP DB 20 2000 330.0 16.4 8.2 7.5 2.5 12.0 16.0 Q1 SN74AC245DWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 12.0 24.0 Q1 SN74AC245NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SN74AC245DBR SN74AC245DWR SSOP DB 20 2000 367.0 367.0 38.0 SOIC DW 20 2000 367.0 367.0 45.0 SN74AC245NSR SO NS 20 2000 367.0 367.0 45.0 SN74AC245PWR TSSOP PW 20 2000 367.0 367.0 38.
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MECHANICAL DATA MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001 DB (R-PDSO-G**) PLASTIC SMALL-OUTLINE 28 PINS SHOWN 0,38 0,22 0,65 28 0,15 M 15 0,25 0,09 8,20 7,40 5,60 5,00 Gage Plane 1 14 0,25 A 0°–ā8° 0,95 0,55 Seating Plane 2,00 MAX 0,10 0,05 MIN PINS ** 14 16 20 24 28 30 38 A MAX 6,50 6,50 7,50 8,50 10,50 10,50 12,90 A MIN 5,90 5,90 6,90 7,90 9,90 9,90 12,30 DIM 4040065 /E 12/01 NOTES: A. B. C. D. All linear dimensions are in millimeters.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.