Datasheet

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SN74ALS1640A, SN74ALS1645A

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS246B – DECEMBER 1982 – REVISED FEBRUARY 1997

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Bidirectional Bus Transceivers in

High-Density 20-Pin Packages

Lower-Power Versions of SN74ALS640B

and SN74ALS645A

Package Options Include Plastic

Small-Outline (DW) Packages and Standard

Plastic (N) 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 SN74ALS1640A features inverting logic, while the SN74ALS1645A features noninverting logic.

The SN74ALS1640A and SN74ALS1645A are characterized for operation from 0°C to 70°C.

FUNCTION TABLE

INPUTS

OPERATION

OE DIR SN74ALS1640A SN74ALS1645A

L L B data to A bus B data to A bus

L HA data to B bus A data to B bus

H X Isolation Isolation

logic symbols

†

3 EN2 [AB]

3 EN1 [BA]

DIR

SN74ALS1640A

3 EN2 [AB]

3 EN1 [BA]

DIR

SN74ALS1645A

†

These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

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.

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.

DIR

GND

DW OR N PACKAGE

(TOP VIEW)

Summary of content (10 pages)

PAGE 1
SN74ALS1640A, SN74ALS1645A OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS246B – DECEMBER 1982 – REVISED FEBRUARY 1997 D DW OR N PACKAGE (TOP VIEW) Bidirectional Bus Transceivers in High-Density 20-Pin Packages Lower-Power Versions of SN74ALS640B and SN74ALS645A Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N) 300-mil DIPs D D DIR A1 A2 A3 A4 A5 A6 A7 A8 GND description 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 VCC OE B1 B2 B3 B4 B5 B6 B7 B8 13 These oc
PAGE 2
SN74ALS1640A, SN74ALS1645A OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS246B – DECEMBER 1982 – REVISED FEBRUARY 1997 logic diagrams (positive logic) SN74ALS1640A OE DIR A1 SN74ALS1645A 19 OE 1 DIR 2 18 B1 A1 19 1 2 To Seven Other Transceivers 18 B1 To Seven Other Transceivers absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 3
SN74ALS1640A, SN74ALS1645A OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS246B – DECEMBER 1982 – REVISED FEBRUARY 1997 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER SN74ALS1640A SN74ALS1645A TEST CONDITIONS MIN VIK VOH VOL II Control inputs A or B ports VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = –18 mA IOH = –0.4 mA VCC = 4 4.5 5V IOH = –3 mA IOH = –15 mA VCC = 4 4.5 5V IOL = 8 mA IOL = 16 mA VCC = 5 5.5 5V VI = 7 V VI = 5.
PAGE 4
SN74ALS1640A, SN74ALS1645A OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS246B – DECEMBER 1982 – REVISED FEBRUARY 1997 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.
PAGE 5
PACKAGE OPTION ADDENDUM www.ti.
PAGE 6
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device SN74ALS1645ANSR Package Package Pins Type Drawing SO NS 20 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 24.4 Pack Materials-Page 1 8.2 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 13.0 2.5 12.0 24.
PAGE 7
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) SN74ALS1645ANSR SO NS 20 2000 367.0 367.0 45.
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