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SN74LS640, SN74LS641, SN74LS642, SN74LS645
Octal Bus Transceivers
These octal bus transceivers are designed for asynchronous two-way communication between data buses. Control function implementation minimizes external timing requirements. These circuits allow data transmission from the A bus to B or from the B bus to A bus depending upon the logic level of the direction control (DIR) input. Enable input (G) can disable the device so that the buses are effectively isolated.
SN74LS640 Datasheet
