1.2V LVCMOS to 3.3V LVTTL level shifter

[twitzelbos]

Hello all,

I'm in need of an 8 Bit unidirectional level shifter that takes 1.2V LVCMOS input signals and turns them into 3.3V TTL output signals. There are a gazillion ICs out there, but I don't seem to be able to confidently select one with the search function in Digikey or on manufacturer websites. The data rate would be roughly 50 Mbps.

Can someone please recommend an IC that will work for this application?

Thank you,
Thomas

[Benta]

LCMOS to TTL at 50 Mbps? Are you sure? Or do you mean LVCMOS?
Ah! I see you fixed the OP. Gotcha.

[twitzelbos]

Yep, we have this working at 3.3V routinely, but now we have a FPGA board that only outputs 1.2V on this port. We are operating SPI near its limits on this (actually mostly 39.5 Mbps, but occasionally higher).

Thomas

[langwadt]

there's numerous dual supply 74xxx245 like; https://www.nexperia.com/products/analog-logic-ics/voltage-translators-level-shifters/74AVC8T245PW.html  that should work

[twitzelbos]

Thank you. Do I read the datasheet correctly, that I would then supply Vcc_A with 1.2V as this is the logical level I'd have on the input, and Vcc_B with 3.3V?

Thanks again,
Thomas

[langwadt]

Thank you. Do I read the datasheet correctly, that I would then supply Vcc_A with 1.2V as this is the logical level I'd have on the input, and Vcc_B with 3.3V?

Thanks again,
Thomas

yes

[twitzelbos]

Thank you!!