TXS0108E: LEVEL TRANSLATION

SATHYA SHREE S

Part Number: TXS0108E
Other Parts Discussed in Thread: TCA9800

Hi,

In our design, we are using Arria 10 FPGA 10ax115sf45 as our master device which has no open drain configuration but has sudo open drain configuration with voltage level of 1.2V. We need to connect with slave device(EEPROM) of 1.8V. Kindly provide a solution to get the level translator.

Thanks

S Sathya shree

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 317320 points

What do you mean with "sudo"?

What protocol, with how many signals, are you using? I²C? SPI?

0 SATHYA SHREE S over 2 years ago in reply to Clemens Ladisch

Intellectual 650 points

I2C interface with SDA, SCL signals.

0 Clemens Ladisch over 2 years ago in reply to SATHYA SHREE S

Guru 317320 points

What do you mean with "sudo"? I²C always requires open-drain outputs.

Use a level shifter like the TCA9800.

0 SATHYA SHREE S over 2 years ago in reply to SATHYA SHREE S

Intellectual 650 points

pseudo open drain configuration

0 Clemens Ladisch over 2 years ago in reply to SATHYA SHREE S

Guru 317320 points

A pseudo open-drain driver has weak pull-up strength (while a real open-drain driver would have no pull-up strength). It behaves pretty much like a pull-up resistor, so you do not need an external pull-up resistor.

The TCA980x does not allow pull-up resistors on its B side, so if you use it, you must connect the A side to the FPGA.

Logic

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TXS0108E: LEVEL TRANSLATION