Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLogic ICsLogic IC - Receiver, transceiver SOIC 20

SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS278 – JANUARY 1995

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

• Bidirectional Bus Transceivers in

High-Density 20-Pin Packages

• True Logic

• 3-State Outputs

• Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Standard Plastic (N)

and Ceramic (J) 300-mil DIPs

description

These octal bus transceivers are designed for

asynchronous two-way communication between

data buses. These devices transmit data from the

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

depending on the level at the direction-control

(DIR) input. The output-enable (OE

) input can be

used to disable the device so that the buses are

effectively isolated.

The -1 version of the SN74ALS645A is identical

to the standard version, except that the

recommended maximum I

is increased to

48 mA. There is no -1 version of the

SN54ALS645A.

The SN54ALS645A and SN54AS645 are

characterized for operation over the full military

temperature range of –55°C to 125°C. The

SN74ALS645A and SN74AS645 are

characterized for operation from 0°C to 70°C.

FUNCTION TABLE

INPUTS

OPERATION

OE DIR

OPERATION

L L B data to A bus

L H A data to B bus

H X Isolation

DIR

GND

SN54ALS645A, SN54AS645 ...J PACKAGE

SN74ALS645A, SN74AS645 . . . DW OR N PACKAGE

(TOP VIEW)

3212019

10 11 12 13

SN54ALS645A, SN54AS645 . . . FK PACKAGE

(TOP VIEW)

DIR

GND

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.

Summary of content (20 pages)

PAGE 1
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS278 – JANUARY 1995 • • • Bidirectional Bus Transceivers in High-Density 20-Pin Packages True Logic 3-State Outputs Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs SN54ALS645A, SN54AS645 . . . J PACKAGE SN74ALS645A, SN74AS645 . . .
PAGE 2
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS278 – JANUARY 1995 logic symbol† OE DIR A1 logic diagram (positive logic) 19 1 OE G3 19 3 EN1 [BA] 3 EN2 [AB] 2 18 1 DIR 1 B1 2 A2 A3 A4 A5 A6 A7 A8 3 17 4 16 5 15 6 14 7 13 8 12 9 11 B2 A1 B3 2 18 B1 B4 B5 B6 B7 To Seven Other Transceivers B8 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
PAGE 3
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS278 – JANUARY 1995 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH SN54ALS645A TYP† MAX TEST CONDITIONS MIN VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = – 18 mA IOH = – 0.4 mA VCC = 4.5 V IOH = – 3 mA IOH = – 12 mA – 1.5 VCC – 2 2.4 II VCC = 4.5 V Control inputs A or B ports VCC = 5 5.5 5V VI = 7 V VI = 5.
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SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS278 – JANUARY 1995 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS278 – JANUARY 1995 switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX† SN54AS645 tPLH tPHL A or B B or A tPZH tPZL OE A or B tPHZ tPLZ OE A or B UNIT SN74AS645 MIN MAX MIN MAX 2 11 2 9.5 2 10.
PAGE 6
SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS278 – JANUARY 1995 PARAMETER MEASUREMENT INFORMATION SERIES 54ALS/74ALS AND 54AS/74AS DEVICES 7V RL = R1 = R2 VCC S1 RL R1 Test Point From Output Under Test CL (see Note A) From Output Under Test RL Test Point From Output Under Test CL (see Note A) CL (see Note A) LOAD CIRCUIT FOR BI-STATE TOTEM-POLE OUTPUTS LOAD CIRCUIT FOR OPEN-COLLECTOR OUTPUTS 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 25-Sep-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device SN74ALS645A-1DWR Package Package Pins Type Drawing SOIC SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) DW 20 2000 330.0 24.4 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 10.8 13.0 2.7 12.0 24.0 Q1 SN74ALS645A-1NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1 SN74ALS645ADWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 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) SN74ALS645A-1DWR SOIC DW 20 2000 367.0 367.0 45.0 SN74ALS645A-1NSR SO NS 20 2000 367.0 367.0 45.0 SN74ALS645ADWR SOIC DW 20 2000 367.0 367.0 45.0 SN74ALS645ANSR SO NS 20 2000 367.0 367.0 45.
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