LSF0204D: SPI level shifter solution with propagation delay lower than 3ns

Andy_Lin

Intellectual 2300 points

Part Number: LSF0204D
Other Parts Discussed in Thread: SN74AVC4T774

Hi Team,

My customer is searching for the SPI level shifter solution as require below

1. voltage level : 1.8V to 3.3V

2. SPI speed: 50MHz

3. Low propagation : target 3ns max.

I had survey our solution with above require , seems only LSF0204D fit , however , the propagation delay max is higher than customer spec, so do we have any other solution which can fit above requirement?

over 4 years ago

0 Clemens Ladisch over 4 years ago

Guru 279390 points

I am not aware of any such solution.

Is that 3 ns value really for the propagation delay, or for the propagation delay skew? (TI devices have < 1 ns for the latter.)

0 Andy_Lin over 4 years ago in reply to Clemens Ladisch

TI__Intellectual 2300 points

Hi Clements,

thanks for feedback, I'm not quire understand what different between propagation delay and propagation delay skew,

could you kindly explain ?

Andy

0 Clemens Ladisch over 4 years ago in reply to Andy_Lin

Guru 279390 points

The skew is the difference of the propagation delay between the channels. See SCAA055.

0 Andy_Lin over 4 years ago in reply to Clemens Ladisch

TI__Intellectual 2300 points

noted , in this case, customer is referring to propagation delay not propagation delay skew.

0 Emrys Maier over 4 years ago in reply to Andy_Lin

TI__Guru* 96842 points

Hi Andy,

The SN74AVC4T774 is probably the closest thing to what they are asking for.

3.3V -> 1.8V max tpd is 3ns

1.8V -> 3.3V max tpd is 3.7ns

Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

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LSF0204D: SPI level shifter solution with propagation delay lower than 3ns