SN74LS645 Datasheet PDF

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. DEVICE LS640 LS641 LS642 LS645 OUTPUT 3-State Open-Collector Open-Collector 3-State LOGIC Inverting True Inverting True CONTROL INPUTS G DIR FUNCTION TABLE OPERATION LS640 LS642 LS641 LS645 L L B data to A bus B data to A bus L H A data to B bus A data to B bus H X Isolation Isolation H = HIGH Level, L = LOW Level, X = Irrelevant GUARANTEED OPERATING RANGES (SN74LS640, SN74LS645) Symbol Parameter Min Typ Max Unit VCC Supply Voltage TA Operating Ambient Temperature Range 4.75 5.0 5.25 V 0 25 70 °C IOH Output Current −...