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SN74ALS638A-1N Datasheet(PDF) 1 Page - Texas Instruments |
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SN74ALS638A-1N Datasheet(HTML) 1 Page - Texas Instruments |
1 / 16 page SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639 OCTAL BUS TRANSCEIVERS SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995 Copyright © 1995, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 • Bidirectional Bus Transceivers in High-Density 20-Pin Packages • Choice of True or Inverting Logic • A-Bus Outputs Are Open Collector; B-Bus Outputs Are 3 State • Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N) 300-mil DIPs DEVICE A OUTPUT B OUTPUT LOGIC SN74ALS638A, SN74AS638A Open collector 3 state Inverting SN74ALS639A, SN74AS639 Open collector 3 state True description These octal bus transceivers are designed for asynchronous two-way communication between open-collector and 3-state buses. The devices transmit data from the A bus (open-collector) to the B bus (3 state) or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so the buses are isolated. The -1 version of SN74ALS638A is identical to the standard version, except that the recommended maximum IOL is increased to 48 mA. The SN74ALS638A, SN74ALS639A, SN74AS638A, and SN74AS639 are characterized for operation from 0 °C to 70 °C. FUNCTION TABLE INPUTS OPERATION OE DIR SN74ALS638A SN74AS638A SN74ALS639A SN74AS639 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 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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