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TXU0304: SPI clock speed and I2S data integrity

Part Number: TXU0304
Other Parts Discussed in Thread: SN74AXC4T774

Dear Designer:

1. I want to use TXU0304 as a 1.8v to 3.3v voltage level converter between 1.8v SOC and 3.3v SPI flash. The SPI flash will run at 104MHz. Is this feasible?

2. I want to use TXU0304 as a 1.8v to 3.3v voltage level converter between 1.8v SOC and 3.3v I2S audio codec. Will the Schmitt trigger function of TXU0304 input reduce or affect the accuracy of data transmission? (I2S MCLK around 50MHz)

Best Regards.

James Chen

  • 您好,

    1、TXU0304支持的最大数据速率如下datasheet截图,可以看出1.8V至3.3V的升压转换,支持的最大速率是100Mbps,也就是50MHZ,因此是达不到您使用的SPI flash的速率的。您可以看下SN74AXC4T774   1.8 V to 3.3 V转换,支持速率310 Mbps(155MHZ)

    2、您这里担心的是手册上“Schmitt-trigger inputs allows for slow and noisy inputs”允许噪声输入吗?如果这样的话,这里您也可以选择SN74AXC4T774   

  • 支持的最大速率是100Mbps,也就是50MHZ,这是怎么得出来的?

  • 您好,

    bps的意思是bit per second,也就是每秒1bit,HZ是每秒一个周期,一个周期有2bits,因此1HZ=2bps;

    如果您有新的问题,请发新帖,谢谢配合