SN74ALS642A Datasheet | Texas Instruments

description SN74ALS641A, SN74ALS642A, SN74AS641 OCTAL BUS TRANSCEIVERS WITH OPENĆCOLLECTOR OUTPUTS SDAS300 - MARCH 1995 DW OR N PACKAGE (TOP VIEW) DIR 1 A1 2 A2 3 A3 4 A4 5 A5 6 A6 7 A7 8 A8 9 GND 10 20 VCC 19 OE 18 B1 17 B2 16 B3 15 B4 14 B5 13 B6 12 B7 11 B8 These octal bus transceivers are designed for asynchronous two-way munication 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 remended maximum IOL is increased to 48 m A in the -1 versions. The SN74ALS641A, SN74ALS642A, and SN74AS641 are characterized for operation from 0°C to 70°C. INPUTS OE DIR FUNCTION TABLE OPERATION SN74ALS641A SN74AS641 B data to A bus B data to A bus A data to B bus A data to B bus Isolation Isolation 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. Copyright  1995, Texas Instruments Incorporated - POST OFFICE BOX 655303 DALLAS, TEXAS 75265 - POST OFFICE BOX 1443 HOUSTON, TEXAS 77251- 1443 SN74ALS641A, SN74ALS642A, SN74AS641 OCTAL BUS TRANSCEIVERS WITH OPENĆCOLLECTOR OUTPUTS SDAS300 - MARCH 1995 logic symbols† SN74ALS641A, SN74AS641 19 OE 1 DIR G3 3 EN1 [BA] 3 EN2...