SN74LV1T34: Looking for a footprint compatible part with lower Vih specification.

chethan md

Part Number: SN74LV1T34
Other Parts Discussed in Thread: SN74AUP1T34

In one of my application, i need to replace SN74LV1T34DCKR device with similar footprint compatible part with lower Vih, preferably <1V.

Do i have some recommendation?

over 5 years ago

0 Clemens Ladisch over 5 years ago

Guru 316940 points

The SN74AUP1T34 is not pin compatible (requires V_CC also on pin 1) and does not run above 3.3 V, but has lower switching thresholds.

What voltages are you using? Why is the input signal so low, is it some kind of analog signal (in which case you would need a Schmitt trigger)?

0 chethan md over 5 years ago in reply to Clemens Ladisch

Intellectual 860 points

I have a signal which rises very fast till 1.2V and then slows down a lot, so to improve my overall signal rise time, i need to switch below 1.2V, so looking for a part.

Attaching my signal which goes to the SN74LV1T34DCKR input.

0 chethan md over 5 years ago in reply to chethan md

Intellectual 860 points

by the way its a 5V CMOS 1 pulse per second timing signal from a source--which is used as a clock reference in my product.

I have used SN74LV1T34DCKR to level shift and buffer to 3.3V CMOS before feeding my CPLD.

0 Clemens Ladisch over 5 years ago in reply to chethan md

Guru 316940 points

This is indeed a slow signal; it requires a Schmitt-trigger input (which would delay the rising edge at the output) or a translator with a lower-voltage input (which cannot be footprint compatible).

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SN74LV1T34: Looking for a footprint compatible part with lower Vih specification.