SN74AXC8T245: Level translator for Data Bus

I found the SN74AXC4T245 does this have the exact same functionality as SN74AXC8T245 except for the fact that it has 4 bits instead of 8 ?

The problem with the SN74AXC4T245 its arrangement of pins (UQFN package) has a different arrangement c.f. SN74AXC8T245 and the BQB package although it has a comparable pin out arrangement it is almost the same size as the SN74AXC8T245 ???

Hello Shmuel,

Our apps team is current out today celebrating Labor Day (US Holiday). Allows us two days to respond back. Thank you for your understanding.

Regards,

Josh 

Another question : for my output voltage I have a choice between 1.0V - 1.3V what are the pros and cons of choosing either range ?

Dear Josh,

Thank yo so much for getting back to me. 

I will be using SN74AXC8T245 with a 32 bit data bus that runs at 100Mhz. Is this chip fast enough ? Could you please also look at my other questions I asked earlier ? 

Best regards

Shmuel 

Hello Shmuel,

Based on the information I gave in my previous answer, the SN74AXC8T245 cannot run at 100MHz when using a VCCA = 3.3V and VCCB 1.2V.

What's was the question you asked earlier? 

Regards,

Josh

Dear Josh,

Do you have another chip with the same pinout and package that would work ? if not what would you suggest as an alternative ? 

What if I went down to 1.1V with the SN74AXC8T245 ?

Best regards

Hello Shmuel,

Since you need to drive 32 channels, the best option would be to use a higher channel count level translator like the SN74AXC8T245. It supports smaller packages like UQFN (RJW) 8mm²

Unfortunately we don't have another level translator that would work. Our devices won't be able to support 100MHz from 3.3V to 1.2V.

We get the same max rate estimation if you went down to 1.1V since tpd was tested using VCCB = 1.2V ± 0.1V 

Regards,

Josh

Dear Josh,

Thanks for getting back to me. "higher channel count level translator like the SN74AXC8T245" this is the same device that I have now did you mean a different device / P/N ?

Bests regards

Shmuel

Hello Shmuel,

My comment above was referring to the SN74AXC8T245.

We have a 16-bit level translator (SN74AVC16T245) with a TVSOP 62.08mm² package

Regards,

Josh

Dear Josh,

I spoke to the Engineer responsible for our data cycle. In the end we are no where near 100MHz burst. We have long data cycles (our read \ write cycle is approx. 100nS-120nS) and the minimum between any 2 cycles will be no less then 40nS - 50 nS. Thus can we safely assume that the SN74AXC8T245 will be certainly fast enough for this application ? (The SN74AVC16T245 is way to big for our design !!)