TXB0104: benefit of level shifter

Fred Cheng

Expert 5810 points

Part Number: TXB0104
Other Parts Discussed in Thread: TCA9406, TXS0102, TCA9416, PCA9306, LSF0102

Hi team,

if I want level shift I2C from 3.3V to 1.8V,

May I know what's the benefit of level shifter if we can do it by just using a single MOS and 1.8V power source ?

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 317450 points

The TXB does not work with I²C.

The TXS0102/TCA9406/TCA9416 do work with I²C. They have rise-time accelerators, which allows much higher frequencies.

The LSF0102/PCA9306 do work with I²C. Each switch is a single MOSFET, but the gate voltage is kept higher than 1.8 V to allow somewhat higher frequencies.

0 Fred Cheng over 3 years ago in reply to Clemens Ladisch

TI__Expert 5810 points

Hi Ladisch,

let me rephrase ,

what's the the TXS0102 benefit if we can do it with single MOS?

is there any other benefit that I miss?

0 Clemens Ladisch over 3 years ago in reply to Fred Cheng

Guru 317450 points

A plain MOSFET is slower. (This does not matter at 400 kHz.)

0 Fred Cheng over 3 years ago in reply to Clemens Ladisch

TI__Expert 5810 points

Hi,

so you mean when in normal I2C frequency (400KHz or lower),

a MOS might just fit as well, right?

+1 Clemens Ladisch over 3 years ago in reply to Fred Cheng

Guru 317450 points

Yes.

Logic

Logic forum

TXB0104: benefit of level shifter