SN74CB3T3125 / unused pins for low power consumption

Toshiyuki

Mastermind 7075 points

Hi,

Customer would like to reduce power consumption. they will use only 2bit I/Os.

How should they deal with unused 2bit I/Os and OE pins ?

In the recommended setting, how could customer reduce power consumption ICCmax=20uA ?

Best Regards,

Kato

over 9 years ago

0 Chris Cockrill over 9 years ago

TI__Mastermind 46480 points

The OE pins should not float so they should be tied high or low. The I/Os can float.

0 Toshiyuki over 9 years ago in reply to Chris Cockrill

Mastermind 7075 points

Hi Chris - san,

Thank you for the reply.

I believe unused I/Os and OE pins should be tied low for low power consumption. Is my understanding of this correct ?

Best Regards,

Kato

0 Chris Cockrill over 9 years ago in reply to Toshiyuki

TI__Mastermind 46480 points

Hi Kato-san

The Oe pin should be tied low for sure.

In most switches it does not matter if the I/O's are tied to anything but since this switch has some translation circutry in it, it is probably a good Idea to tie the I/O's low also.

So yes you are correct.

Logic

Logic forum

SN74CB3T3125 / unused pins for low power consumption