TXS0108E: TXS0108E output low level is not 0V

jeno.zhang

Part Number: TXS0108E
Other Parts Discussed in Thread: TCA9509

Tool/software:

Hello，

TXS0108E is used for level conversion from 2.5V to 3.3V. Used for IIC interface. When the input voltage is 0V, the output voltage is 0.6V. Please help analyze the reason. Thanks！

9 months ago

0 Jack Guan 9 months ago

TI__Mastermind 40526 points

Hi Jeno,

The TXS0108E is not a buffer, it will not be able to redrive the logic low state. Instead, the output low voltage is directly dependent on the input low voltage, and its relationship is dependent on the VIL and the current through the internal switch. This app note covers this further in detail: www.ti.com/.../scea056.pdf

Regards,

Jack

0 jeno.zhang 9 months ago in reply to Jack Guan

Expert 2875 points

Hello，

Please help recommend the components for this application.Thanks！

0 Clemens Ladisch 9 months ago in reply to jeno.zhang

Guru 316880 points

Why are you using an eight-channel device, when I²C needs only two? Are there other signals?

0 Jack Guan 9 months ago in reply to Clemens Ladisch

TI__Mastermind 40526 points

Hi Jeno,

In addition to Clemens' comments, please see the I2C buffers such as TCA980x or TCA9509 capable of redriving signals to achieve lower VOLs.

Regards,

Jack

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TXS0108E: TXS0108E output low level is not 0V