SN74LVC2G14: SN74LVC2G14 VT+ & VT- RANGE in VCC 3V

Chao Fu Chen

Part Number: SN74LVC2G14

Hi Expert,

I have a question about the material SN74LVC2G14.
Is the following understanding of the VT+ and VT- specifications in the following specification sheets correct?
Vcc=3V, VT voltage range 1.3~2.2V SN74LVC2G14 is judged as High
Vcc=3V, VT voltage range 0.6~1.3V SN74LVC2G14 is judged as Low
If so, then the following questions arise. Please help to confirm the reply.
1. High level=1.3~2.2V, what is above 2.2V?
2. Low level=0.6~1.3V, what is below 0.6V?
3. To avoid misjudgment of SN74LVC2G14, VT should try to give a low signal below 0.6V or a high signal above 2.2V?
4. How high frequency noise can the VT of this component detect? 100MHz? 250MHz?

Eddie

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 320720 points

In the worst case, the input voltage must be above 2.2 V to be judged as high.
In the worst case, the input voltage must be below 0.6 V to be judged as low.
When the voltage is between 0.6 V and 2.2 V, the input state is not guaranteed.

There is no guaranteed minimum input pulse width. If you want to ignore high-frequency noise, add a low-pass filter.

0 Chao Fu Chen over 2 years ago in reply to Clemens Ladisch

TI__Intellectual 1170 points

Hi Ladisch and Team,

One question you loss is How high frequency noise can the VT of this component detect? 100MHz? 250MHz?

Eddie

0 Malcolm Lyn over 2 years ago in reply to Chao Fu Chen

TI__Mastermind 30990 points

Hi,

What do you mean by that question? The part can operate at a minimum frequency of ~180MHz at 3.3V VCC. I'm not sure what is meant by the voltage threshold detecting noise.

Best,

Malcolm

0 Clemens Ladisch over 2 years ago in reply to Malcolm Lyn

Guru 320720 points

LVC can do at least 175 MHz in the worst case. The highest frequency it can actually detect in the 'best' case is much higher.

In practice, you add a low-pass filter that removes all frequencies higher than those of your signals.

Logic

Logic forum

SN74LVC2G14: SN74LVC2G14 VT+ & VT- RANGE in VCC 3V