Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLogic ICsLogic IC - Receiver, transceiver PDIP 20







SDAS300 − MARCH 1995

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443

• Bidirectional Bus Transceivers in

High-Density 20-Pin Packages

• Choice of True or Inverting Logic

• Package Options Include Plastic

Small-Outline (DW) Packages and

Standard Plastic (N) 300-mil DIPs

DEVICE

LOGIC

SN74ALS641A, SN74AS641 True

SN74ALS642A Inverting

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

upon the level at the direction-control (DIR) input. The output-enable (OE

) input disables the device so that the

buses are effectively isolated.

The -1 versions of the SN74ALS641A and SN74ALS642A are identical to the standard versions, except that

the recommended maximum I

is increased to 48 mA in the -1 versions.

The SN74ALS641A, SN74ALS642A, and SN74AS641 are characterized for operation from 0°C to 70°C.

FUNCTION TABLE

INPUTS

OPERATION

OE DIR

SN74ALS641A

SN74AS641

SN74ALS642A

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

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

H X Isolation Isolation

DIR

GND

DW OR N PACKAGE

(TOP VIEW)

  !" # $%&" !#  '%()$!" *!"&+

*%$"# $ " #'&$$!"# '& ",& "&#  &-!# #"%&"#

#"!*!* .!!"/+ *%$" '$&##0 *&# " &$&##!)/ $)%*&

"&#"0  !)) '!!&"&#+

Summary of content (17 pages)

PAGE 1
SDAS300 − MARCH 1995 • • • DW OR N PACKAGE (TOP VIEW) Bidirectional Bus Transceivers in High-Density 20-Pin Packages Choice of True or Inverting Logic Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N) 300-mil DIPs DEVICE LOGIC SN74ALS641A, SN74AS641 True SN74ALS642A DIR A1 A2 A3 A4 A5 A6 A7 A8 GND Inverting description 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 1
PAGE 2
SDAS300 − MARCH 1995 logic symbols† SN74ALS641A, SN74AS641 OE DIR A1 19 1 2 SN74ALS642A G3 OE 3 EN1 [BA] 3 EN2 [AB] DIR 18 1 B1 A1 19 1 2 2 A2 A3 A4 A5 A6 A7 A8 3 EN1 [BA] 3 EN2 [AB] 18 1 B1 2 3 17 4 16 5 15 6 14 7 13 8 12 9 11 B2 A2 B3 A3 B4 A4 B5 A5 B6 A6 B7 A7 B8 A8 3 17 4 16 5 15 6 14 7 13 8 12 9 11 † These symbols are in accordance with ANSI/IEEE Std 91-1984 an
PAGE 3
SDAS300 − MARCH 1995 logic diagrams (positive logic) SN74ALS641A, SN74AS641 OE DIR A1 SN74ALS642A 19 OE 1 DIR 18 2 B1 A1 To Seven Other Transceivers 19 1 18 2 B1 To Seven Other Transceivers absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 4
SDAS300 − MARCH 1995 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER SN74ALS641A SN74ALS642A TEST CONDITIONS MIN VIK IOH VOL VCC = 4.5 V, VCC = 4.5 V, II = − 18 mA VOH = 5.5 V VCC = 4.5 V IOL = 12 mA IOL = 24 mA IOL = 48 mA‡ II Control inputs VCC = 5.5 V, VI = 7 V IIH Control inputs A or B ports§ VCC = 5.5 V, VI = 2.
PAGE 5
SDAS300 − MARCH 1995 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs and I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 6
SDAS300 − MARCH 1995 switching characteristics (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 680 Ω, TA = MIN to MAX† UNIT SN74AS641 MIN tPLH tPHL A or B B or A tPLH tPHL OE A or B tPLH tPHL DIR A or B 5 21 1 7.5 5 21 1 9 5 22 1 10 † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PAGE 7
SDAS300 − MARCH 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 CL (see Note A) CL (see Note A) LOAD CIRCUIT FOR BI-STATE TOTEM-POLE OUTPUTS LOAD CIRCUIT FOR OPEN-COLLECTOR OUTPUTS 3.
PAGE 8
PACKAGE OPTION ADDENDUM www.ti.
PAGE 9
PACKAGE OPTION ADDENDUM www.ti.
PAGE 10
PACKAGE OPTION ADDENDUM www.ti.com 28-Aug-2010 LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device.
PAGE 11
PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device SN74ALS641A-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 SN74ALS641A-1NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1 SN74ALS641ADWR SOIC DW 20 2000 330.0 24.4 10.8 13.0 2.7 12.0 24.
PAGE 12
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) SN74ALS641A-1DWR SOIC DW 20 2000 367.0 367.0 45.0 SN74ALS641A-1NSR SO NS 20 2000 367.0 367.0 45.0 SN74ALS641ADWR SOIC DW 20 2000 367.0 367.0 45.0 SN74ALS641ANSR SO NS 20 2000 367.0 367.0 45.0 SN74ALS642A-1NSR SO NS 20 2000 367.0 367.0 45.
PAGE 13
PAGE 14
PAGE 15
PAGE 16
PAGE 17
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 JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.