Is noise a problem when using a logic level shifter

level-shiftinglevel-translationlogic-level

Good morning everyone,

I'm building a device that uses several bidirectional logic level translators to interface 3.3V microcontroller to 5V, 2.5V and 1.8V sensors (via I2C lines).

But I wonder if level shifters produce any significant noise; this is interesting for me due to extensive use of MOSFETs, internal current sources and one-shot pulse devices in level shifters (please see MAX14548E as an example).

I'm asking because I haven't seen any mention of noise characteristics in specs of any of LLT devices.

Is noise a problem with level shifting, or should I put my worries to rest?

Thank you.

Best Answer

The current sources simply represent the device's internal pullups on the data lines.

The pulse generators are not part of the device at all, but rather part of the test setup used to demonstrate the device's performance.

None of this will contribute any significant noise in your application.