SDLS185 - AUGUST 1979 - REVISED MARCH 1988
PRODUCTION DATA documents contain information current as of publicationdate. Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily include testingof all parameters.
These octal bus transceivers are designed for asynchronous two-way communicationbetween data buses. The control function implementation allows for maximumflexibility in timing.
These devices allow data transmission from the A bus to the B bus or fromthe B bus to the A bus depending upon the logic levels at the enable inputs(G\BA and GAB).
The enable inputs can be used to disable the device so that the buses areeffectively isolated.
The dual-enable configuration gives the 'LS620, 'LS621, and 'LS623 thecapability to store data by simultaneous enabling of G\BA and GAB.Each output reinforces its input in this transceiver configuration. Thus,when both control inputs are enabled and all other data sources to the twosets of bus lines are at high impedance, both sets of bus lines (16 in all)will remain at their last states. The 8-bit codes appearing on the two setsof buses will be identical for the 'LS621 and 'LS623 devices or complementaryfor the 'LS620.
View more information about generic part numbers:SN74LS620, SN74LS621, SN74LS623
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