TI SN74CBT3125CDR

The SN74CBT3125C is a high-speed TTL-compatible FET bus switch with low on-resistance (r_on), enabling minimal propagation delay. The active undershoot protection circuits on the A and B ports of the SN74CBT3125C provide undershoot protection up to -2V by detecting undershoot events and ensuring the switches remain in the appropriate off state. The SN74CBT3125C is organized as four 1-bit bus switches, each with an independent output enable (1OE, 2OE, 3OE, 4OE) input. It can be used as four 1-bit bus switches or as a single 4-bit bus switch. When OE is low, the corresponding 1-bit bus switch closes, connecting port A to port B and allowing bidirectional data flow between the ports. When OE is high, the corresponding 1-bit bus switch opens, and a high-impedance state exists between port A and port B. This device fully supports partial-power-down applications using Ioff. The Ioff feature ensures that no harmful reverse current flows through the device during power-down. The device has isolation functionality during power-down.

• USB interface
• Bus isolation
• Low-distortion signal gating