资 源 简 介
54LS245/DM54LS245/DM74LS245TRI-STATEÉ Octal Bus TransceiverGeneral DescripTIonThese octal bus transceivers are designed for asynchronoustwo-way communicaTIon between data buses. Thecontrol funcTIon implementaTIon minimizes external timingrequirements.The device allows data transmission from the A bus to the Bbus or from the B bus to the A bus depending upon the logiclevel at the direction control (DIR) input. The enable input(G) can be used to disable the device so that the buses areeffectively isolated.FeaturesY Bi-Directional bus transceiver in a high-density 20-pinpackageY TRI-STATE outputs drive bus lines directlyY PNP inputs reduce DC loading on bus linesY Hysteresis at bus inputs improve noise marginsY Typical propagation delay times, port-to-port 8 nsY Typical enable/disable times 17 nsY IOL (sink current)54LS 12 mA74LS 24 mAY IOH (source current)54LS b12 mA74LS b15 mAY Alternate Military/Aerospace device (54LS245) is available.Contact a National Semiconductor Sales Office/Distributor for specifications.
