SN74AVC2T45: SN74AVC2T45

user4786735

Intellectual 460 points

Part Number: SN74AVC2T45
Other Parts Discussed in Thread: SN74AXC2T45, , SN74AUC2G34

SN74AXC2T45 could we apply in 80MHz signal operating, 3.3v to 0.8v?

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 283370 points

The SN74AVC2T45 does not work at 0.8 V.
The SN74AXC2T45 has a worst-case propagation delay of 38 ns, which corresponds to 26 Mbps.

For unidirectional downtranslation, you can also use any buffer with overvoltage-tolerant inputs. The SN74AUC2G34 has a typical propagation delay of 6.4 ns, which corresponds to 156 Mbps (but no worst case specification).

0 user4786735 over 2 years ago in reply to Clemens Ladisch

Intellectual 460 points

Hi Ladisch

Thanks you feedback.

another question.

If I don't care about propagation delay, I care about waveform integrity. Would the SN74AXC2T45 be my choice?

Can I get 50Mhz crystal good waveform in SN74AXC2T45 output?

0 Clemens Ladisch over 2 years ago in reply to user4786735

Guru 283370 points

I suspect that at 0.8 V, AUC has better waveforms than AXC. But the best way to find out is to test them yourself.

0 Jack Guan over 2 years ago in reply to user4786735

TI__Mastermind 27211 points

For signal integrity testing, IBIS models can be used to simulate your application. Note that loading conditions can have an impact the signal quality of your waveforms (See section 11 of datasheet for more details).

SN74AXC2T45 IBIS Model

SN74AUC2G34 IBIS Model

Regards,

Jack

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

Logic

Logic forum

SN74AVC2T45: SN74AVC2T45