General Description
The Fairchild Switch FSTU6800 provides 10-bits of high speed 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 have “undershoot hardened” circuit 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 device also precharges the B Port to a selectable bias voltage (BiasV) to minimize live insertion noise.

Features
■ 4Ω switch connection between two ports.
■ Undershoot Hardened to -2.0V.
■ Soft enable turn-on to minimize bus-to-bus charge sharing during enable.
■ Low lCC.
■ Zero bounce in flow-through mode.
■ Output precharge to minimize live insertion noise.
■ Control inputs compatible with TTL level.
■ See Applications Note AN-5008 for details.