SN74LVC2G14: What is the bandwidth of SN74LVC2G14?

Zhizhao Niu

Part Number: SN74LVC2G14
Other Parts Discussed in Thread: SN74LVC1GX04

Hi team,

I plan to use the SN74LVC2G14 as start-up circuit of 32.768KHz crystal. Could you please help confirm whether the bandwidth of SN74LVC2G14 is enough? Thank you!

B.R.

Lucas

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 317370 points

LVC devices support many MHz.

Wouldn't you use an unbuffered inverter (e.g., SN74LVC1GX04) for a crystal?

0 Zhizhao Niu over 3 years ago in reply to Clemens Ladisch

TI__Expert 4430 points

Thanks. Sorry for lack some background knowledge. Can you share what is the advantage when using the SN74LVC1GX04 for crystal or is there any risk to keep SN74LVC2G14?

B.R.

Lucas

0 Clemens Ladisch over 3 years ago in reply to Zhizhao Niu

Guru 317370 points

A crystal generates a sine wave. A buffered logic device would output a square wave. (All logic devices except "1GU" or "1GX" are buffered.)

0 Sebastian Muriel over 3 years ago in reply to Zhizhao Niu

TI__Mastermind 18360 points

Hi Lucas,

The gain of buffered inverters is much higher than unbuffered inverters. Since the gain is very high for buffered inverters, they are less stable than unbuffered inverters in oscillator circuits.

This app note should be helpful: Use of the CMOS Unbuffered Inverter in Oscillator Circuits

Regards,

Sebastian

Logic

Logic forum

SN74LVC2G14: What is the bandwidth of SN74LVC2G14?