The MC74F640 is an octal transceiver featuring inverting 3-state bus compatible outputs in both transmit and receive directions. The B port outputs are capable of sinking 64 mA and sourcing 15 mA, providing very good capacitive drive characteristics.
   
• High-Impedance NPN Base Inputs for Reduced Loading (70 µA in High and Low States)
• Ideal for Applications which Require High-Output Drive and Minimal Bus Loading
• Inverting Version of F245
• Octal Bidirectional Bus Interface
• 3-State Buffer Outputs Sink 64 mA and Source 15 mA
• ESD Sensitive — 4000 V HBM