The Harris CD74HC640 and CD74HCT640 silicon-gate CMOS three-state bidirectional inverting and non-inverting buffers are intended for two-way asynchronous communication between data buses. They have high drive current outputs which enable high-speed operation when driving large bus capacitances. These circuits possess the low power dissipation of CMOS circuits, and have speeds comparable to low power Sckottky TTL circuits. They can drive 15 LSTTL loads. The CD74HC640 and CD74HCT640 are inverting buffers.