FSTU6800

The Fairchild Switch FSTU6800 provides 10-bits of highspeed CMOS TTL-compatible bus switching. The low on resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. Both the A Ports and the B Ports of FSTU6800 are "undershoot hardened" with UHC  protection to support an extended input range to 2.0V below ground. Fairchild's integrated Undershoot Hardened Circuit, UHC
senses undershoot at the I/Os, and responds by preventing voltage differentials from developing and turning on the
switch. The FSTU6800 also precharges the B Port to a selectable bias voltage (BiasV) to minimize live insertion noise.

The FSTU6800 is organized as a 10-bit switch with a bus enable (OE) signal. When OE is LOW, the switch is ON and Port A is connected to Port B. When OE is HIGH, the switch is OPEN and the B Port is precharged to BiasV through an equivalent 10-k resistor.