The Fairchild Switch FSTUD16211 provides 24-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. A diode to V_CC has been integrated into the circuit to allow for level shifting between 5V inputs and 3.3V outputs.

The device is organized as a 12-bit or 24-bit bus switch. When OE#₁ is LOW, the switch is ON and Port 1A is connected to Port 1B. When OE#₂ is LOW, Port 2A is connected to Port 2B. When OE#_1/2 is HIGH, a high impedance state exists between the A and B Ports. The A and B Ports have "undershoot hardened" circuit protection to support an extended range to 2.0V below ground. Fairchild's integrated Undershoot Hardened Circuit (UHC®) senses undershoot at the I/O's, and responds by preventing voltage differentials from developing and turning on the switch.

• Undershoot hardened to -2V (A and B Ports)
• Voltage level shifting
• 4 ohm switch connection between two ports
• Minimal propagation delay through the switch
• Low l_CC
• Zero bounce in flow-through mode
• Control inputs compatible with TTL level
• See Applications Note AN-5008 for details
• Also packaged in plastic Fine-Pitch Ball Grid Array (FBGA) (Preliminary)