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SN74ALS620ADW Scheda tecnica(PDF) 1 Page - Texas Instruments |
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SN74ALS620ADW Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 15 page SN74ALS620A, SN74ALS621A, SN74ALS623A, SN74AS623 OCTAL BUS TRANSCEIVERS SDAS226A – DECEMBER 1982 – REVISED JANUARY 1995 Copyright © 1995, Texas Instruments Incorporated 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 • Local Bus-Latch Capability • Choice of True or Inverting Logic • Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N) 300-mil DIPs DEVICE OUTPUT LOGIC SN74ALS620A 3 state Inverting SN74ALS621A Open collector True SN74ALS623A, SN74AS623 3 state True description These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation allows for maximum flexibility in timing. These devices allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending upon the logic levels at the output-enable (OEAB and OEBA) inputs. The output-enable inputs disable the device so that the buses are effectively isolated. The dual-enable configuration gives the transceivers the capability to store data by simultaneously enabling OEAB and OEBA. Each output reinforces its input in this transceiver configuration. When both OEAB and OEBA are enabled and all other data sources to the two sets of bus lines are in the high-impedance state, both sets of bus lines (16 total) remain at their last states. The 8-bit codes appearing on the two sets of buses are identical for the SN74ALS621A, SN74ALS623A, and SN74AS623 or complementary for the SN74ALS620A. The -1 versions of the SN74ALS620A and SN74ALS621A are identical to the standard versions, except that the recommended maximum IOL is increased to 48 mA in the -1 versions. The SN74ALS620A, SN74ALS621A, SN74ALS623A, and SN74AS623 are characterized for operation from 0 °C to 70°C. FUNCTION TABLE INPUTS OPERATION OEBA OEAB SN74ALS620A SN74ALS621A SN74ALS623A SN74AS623 L L B data to A bus B data to A bus H HA data to B bus A data to B bus H L Isolation Isolation L H B data to A bus, A data to B bus B data to A bus, A data to B bus 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 OEAB A1 A2 A3 A4 A5 A6 A7 A8 GND VCC OEBA 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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