【概要】These octal bus transceivers are designed for asynchronous two-way communication between data buses. The devices transmit data from the A bus to the B bus or from the B bus to the A bus depending upon the level at the direction control （DIR） input. The enable input （G） can be used to disable the device so the buses are effectively isolated.The -1 versions of the SN74LS640 thru SN74LS642, SN74LS644, and SN74LS645 are identical to the standard versions except that the recommended maximum IOL is increased to 48 milliamperes. There are no -1 versions of the SN54LS640 thru SN54LS642, SN54LS644, and SN54LS645.The SN54LS640 thru SN54LS642, SN54LS644, and SN54LS645 are characterized for operation over the full military tempearture range of -55°C to 125°C. The SN74LS640 thru SN74LS642, SN74LS644, and SN74LS645 are characterized for operation from 0°C to 70°C.SN74LS64X-1 Versions Rated at IOL of 48 mABi-directional Bus Transceivers in High-Density 20-Pin PackagesHysteresis at Bus Inputs Improves Noise MarginsChoice of True or Inverting LogicChoice of 3-State or Open-collector Outputs【主な仕様】
