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SN74LVC1G00: hysteresis

Part Number: SN74LVC1G00
Other Parts Discussed in Thread: SN74LVC1GU04, SN74LVC1404

Tool/software:

I am looking for a replacement for TinyLogic NAND gate NC7SZ00, which has a small amount of hysteresis (30mVpp) that is detrimental in my application. TI SN74LVC1G00 may be a good alternative, but does it also have similar input hysteresis? TI's cross reference tool shows both of these parts as having no hysteresis, so perhaps small hysteresis (small compared to parts listed as Schmitt Trigger) is an undocumented feature? TI's logic family overview indicates use of hysteresis but does not specify in which logic families. Can you suggest TI logic families that are known to have no hysteresis, and that will comfortably operate at 10MHz?

  • All modern logic families have a small amount of hysteresis.

    What is the actual problem you're trying to solve? For a crystal oscillator, you need an unbuffered inverter like the SN74LVC1GU04 or better SN74LVC1404, or a comparator.

  • I am using a NAND gate as in inexpensive gated RF amplifier. A feedback resistor and input blocking cap keeps it DC-centered. This works well with unbuffered gates, but the gate I am using has a bit of hysteresis which, combined with the RC feedback, makes a low-frequency oscillator. I was hoping to find a suitable non-hysteretic drop-in replacement. That seems unlikely, especially considering you observation. So, I have found a completely different way to solve the problem. Thank you much for your insight.