SN74AS623 Datasheet | Texas Instruments

description SDAS226A - DECEMBER 1982 - REVISED JANUARY 1995 DW OR N PACKAGE (TOP VIEW) OEAB 1 A1 2 A2 3 A3 4 A4 5 A5 6 A6 7 A7 8 A8 9 GND 10 20 VCC 19 OEBA 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. 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 plementary for the SN74ALS620A. The -1 versions of the SN74ALS620A and SN74ALS621A are identical to the standard versions, except that the remended maximum IOL is increased to 48 m A in the -1 versions. The SN74ALS620A, SN74ALS621A, SN74ALS623A, and SN74AS623 are characterized for operation from 0°C to 70°C. INPUTS OEBA OEAB FUNCTION TABLE OPERATION SN74ALS620A SN74ALS621A SN74ALS623A B data to A bus B data to A bus A data to B bus Isolation A data to B bus Isolation B data to A bus, A data to B bus B data to A bus, A data to B bus 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. - POST OFFICE BOX 655303 DALLAS, TEXAS...