TXS0104E: Logic forum

SPI or QSPI? SPI uses unidirectional signals, for which the TXU0304 would be a better solution

The other devices (labelled "System Controller" and "System" in the example) must use push/pull outputs. QSPI devices always do this.

The TXS is auto-bidirectional, i.e., the same signal line could be used in either direction.

SPI does not have bidirectional signals. While there are signals going in both directions, each individual signal has a fixed direction. I recommend the TXU0304 instead.

1. When the TXS is driven with push/pull signals, it is faster than when it is driven with open-drain signals.

2. It will work. But in my design, I would use the TXU0304.

Hi Hemry,

Even though the bandwidth of the TXU device is higher and then speed of your application is not very fast (8MHz/ 16Mbps), the TXU will still be a better choice due to its buffering capability and improved robustness (i.e schmitt trigger inputs) over the TXS0104E. Ideally, the TXS0104E is to be used if the signals truly auto-direction per channel. Since there is no buffering circuitry internal to the TXS device, its open-drain outputs provide compatibility to both push-pull and open drain drivers. 

Regards,

Jack