The SN74CBTU4411 device is organized as an 11-bit 1-of-4 multiplexer or demultiplexer with a single switch-enable (EN) input. When EN is low, the switch is enabled and the H port is connected to one of the D ports. Ports D0 to D9 for the disabled channels are connected to V_BIAS through a 400-Ω resistor. DQS_EN determines the output voltage for the disabled D10 ports. When DQS_EN is low, this voltage is V_BIAS. When DQS_EN is high, the disabled D10 ports are connected to an internal voltage (V_{BIAS_DQS}) source, which is approximately equal to 0.7 V_DD.

When EN is high, all the channels are disabled. Ports D0 to D9 are connected to V_BIAS. For the D10 port, the disabled output voltage is determined by the DQS_EN input. When DQS_EN is low, this voltage is V_BIAS. When DQS_EN is high, this voltage is V_DD.