TXB0104: TXB0104 for SPI interface

Hello,

From what I can tell, the input transition rate is very slow, which may be causing this response.
The input transition rate should be faster than 30ns/V.
If not, then the internal one-shot that is being triggered, can expire before the input rises quickly, and therefore the output returns back down and then the response is dominated by the RC on the output. This device can only drive a limited amount of current and has a 4kohm resistor in series with the output, so the RC time constant is dependent upon this 4kOhm output and the output capacitance.

So in short, there are two primary factors likely leading to this response:
1. Slow input transition time is allow the internal one-shot to expire before the input is high.
2. The output capacitance is limiting the rising and falling edge to be slow because of the limited current drive of the device.

I hope that this helps.
Is there any way to be able to improve these two? If so, i believe you will have a much cleaner response.

If there is no way to improve upon these, then it is possible that the LSF0204 device could be used in the same application, and the output pullup can be decreased to get a faster response time/cleaner edge.

Best,
Michael

Hello,

If you decide to go with the LSF0204 device, please see our training on how these devices work and note the difference between the LSF010x and the LSF020x devices.

training.ti.com/logicminute

Best,
Michael