Hi Frank,

I added a few things to make it easier for comparison of waveforms.

(1) Purple lines show the 50% input voltage level and the falling edges of each waveform crossing it. These are used for timing.

(2) Yellow lines are the same slope, for comparison…

Hi Emrys,

Thank you for the clarification.

Regards,

Danilo

Hi Danilo,

There is a diode between the output and the supply, so exceeding the supply value + ~0.7V will cause the diode to forward bias and current will flow from the output to the supply pin. This is often referred to as "back powering" as it can result…

Hi Oliver,

They aren't able to provide reference data.

Hi Dylan,

Could you help to check with design team and give a reference data? 

Thanks.

Oliver Ou

Hey Oliver,

Unfortunately, there is no cross talk spec.

There is no difference. See [FAQ] What is the difference between the SN74HCxx and the SN74HCxxA?

See [FAQ] What method is best used for estimating specification values between those given in the datasheet?

No problem!

Take a look at SN74LVTZ244 to see if your package requirements fit.

Thanks!

Chad Crosby

Thx Chad,

. Is there any 8 channel device with PU3S?  customer has space issue to use 16 ch device .

Hi Dilip,

As seen in this app note, a hot insertion requires the device to have an Ioff spec, as well as Power up 3-state circuitry. Unfortunately, the SN74ALVC244 does not have PU3S circuitry & is not suitable for hot insertion.

On the other hand…

Hi,

I agree with Clemen's response on this. Using a unidirectional device will simplify your design work as there are less things to worry about. This is because as Clemens mentioned, if there are any large reflections on the transmission line then it…

The TXB transmits signals in both directions. If the ringing is large enough so that it looks like the beginning of a signal edge, the TXB will transmit a wrong edge on the wrong pin. A unidirectional shifter like the SN74AXC8T245 will ignore ringing…

Thanks Clemens for responding quickly.

Signals are unidirectional. Can you elaborate on the downside of using a bidirectional level shifter? We did see ringing on both edges, is that what you're pointing towards?

Are the signal lines actually bidirectional? Using a line driver implies they're not, in which case it would be a better idea to use a unidirectional or direction-controlled level shifter.

How many signals are there in each direction?

1. The datasheet…

Hi Emanuel, and welcome to the forums!

There is an FAQ that directly addresses your question located here:

Please let me know if I can be of further assistance.