TI SN74CBT3257CDBQR

The SN74CBT3257C is a high-speed TTL-compatible FET multiplexer/demultiplexer with low on-resistance (r_on), enabling minimum propagation delay. The active undershoot protection circuits on the A and B ports provide undershoot protection up to -2V by detecting undershoot events and ensuring the switches remain in the correct off state. The SN74CBT3257C is a 4-bit 1-of-2 multiplexer/demultiplexer with an output enable (OE) input. The select (S) input controls the data path of the multiplexer/demultiplexer. When OE is low, the multiplexer/demultiplexer is enabled, and the A port is connected to the B port, allowing bidirectional data flow between the ports. When OE is high, the multiplexer/demultiplexer is disabled, and there is a high-impedance state between the A and B ports. This device is fully suitable for partial-power-down applications using Ioff. The Ioff feature ensures that no damaging current flows back through the device during power-down. The device has isolation functionality during power-down. To ensure a high-impedance state during power-up or power-down, OE should be connected to V_CC through a pull-up resistor; the minimum value of the resistor is determined by the sink current capability of the driver.

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