LSF0102: LSF0102 Application issue

Hugo Liu

Part Number: LSF0102
Other Parts Discussed in Thread: SN74AXC2T45

Hi Sir,

Our customer application is 1.2V to 1.8V, so we need to add a Bidirectional level shifter IC for connection.
The clock and data signals of our IC are 52MHz. Can I use the LSFXX IC? Can I not add a Pull up resistor?

Hugo

over 5 years ago

0 Clemens Ladisch over 5 years ago

Guru 316940 points

It is possible to get high speeds out of a LSF device, but this requires very strong pull-up resistors, which consume power.

What protocol are you using? Do you really have bidirectional signals on the same line? If each signal is unidirectional, then a unidirectional or direction-controlled shifter would be a better solution.

0 ShreyasRao over 5 years ago

TI__Guru 62170 points

Hugo,

Please refer to the LSF training videos on ti.com

https://training.ti.com/introduction-voltage-level-translation-lsf-family

Strong pullup resistors along with low capacitive loading are required if high speeds needs to be achieved out of LSF. As Clemens suggested, usually, 52Mhz speeds are achieved using buffered DIR controlled translators like the SN74AXC2T45.

Logic

Logic forum

LSF0102: LSF0102 Application issue