FSTU162450

Select pins S₀, S₁, S₂ are intended to be used as static user configurable control pins. The AC performance of these pins has not been characterized or tested. Switching of these select pins during system operation may temporarily
disrupt output logic states and/or enable pin controls.

The Fairchild Universal Bus Switch FSTU162450 provides 4-bit, 5-bit, 8-bit, 10-bit, 16-bit, 20-bit 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.

The FSTU162450 is designed to allow "customer" configuration control of the enable connections. The FSTU162450 can be organized as either a five 4-bit, four 5-bit, two 10-bit or one 20-bit enable bus switch. Also achieveable are 8-bit and 16-bit enabled configurations (see Functional Description).The device's bit configuration is controlled through select pin logic. (see Truth Table). When OE_x is LOW, Port Ax is connected to Port B_x. When OE_x is HIGH, the switch is OPEN.

The A and B Ports of FSTU162450 are protected against undershoot to support an extended range to 2.0V below ground.Fairchild's integrated Undershoot Hardened Circuit (UHC^TM) senses undershoot at the I/O and responds by preventing voltage differentials from developing and turning the switch on.