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SN74ALS642ADW 데이터시트(PDF) 1 Page - Texas Instruments |
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SN74ALS642ADW 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 18 page SN74ALS641A, SN74ALS642A, SN74AS641 OCTAL BUS TRANSCEIVERS WITH OPENCOLLECTOR OUTPUTS SDAS300 − MARCH 1995 Copyright 1995, Texas Instruments Incorporated 1 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 IOL 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 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 DIR A1 A2 A3 A4 A5 A6 A7 A8 GND VCC OE B1 B2 B3 B4 B5 B6 B7 B8 DW OR N PACKAGE (TOP VIEW) 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. |
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