TXS0108E: TXS0108E related issues

jeno.zhang

Part Number: TXS0108E

Hi，

TXS0108E is used for IIC level conversion, with a communication rate of about 1MHz. The customer wants to connect a 100 ohm resistor on the signal line, as shown below. Is this feasible？

Thanks！

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 317250 points

This will add a voltage drop to the signal line (the current through both pull-up resistors will also flow through this resistor). This might or might not be a problem in the customer's circuit, depending on the other devices' actual V_OL and V_IL.

0 Jack Guan over 1 year ago

TI__Mastermind 40976 points

Hey Jeno,

In addition to Clemens' response, you may also refer to Factors Affecting VOL for TXS and LSF Auto-bidirectional Translation Devices for further clarification.

Note that the TXS will not be able to buffer the I2C signals. Is the series resistor attempting to impedance match with a transmission line? If so, I2C buffers can be used instead to redrive I2C signals over longer distances/ heavier cap. loads.

Regards,

Jack

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TXS0108E: TXS0108E related issues