SN74AUP1G34: Input Hysteresis

K.Yaita

Part Number: SN74AUP1G34
Other Parts Discussed in Thread: SN74AUP1G17

Hi Team,

The datasheet shows the following however there is no Vhys in Electrical Characteristics.
-------------------------------------
• Input Hysteresis Allows Slow Input Transition and
Better Switching Noise Immunity at the Input
(Vhys = 250 mV Typ at 3.3 V)
-------------------------------------
Does SN74AUP1G34 have "Input Hysteresis" feature?

Best Regards,
Yaita

over 3 years ago

+1 Clemens Ladisch over 3 years ago

Guru 276100 points

Leadframe and bond wires add parasitic resistance and inductance, which slow down even fast signal edges and cause ground bounce.

So to increase the noise margin around the switching threshold, AUP inputs have a small amount of hysteresis.

This hysteresis is not large enough that it would be possible to guarantee a useable amount as an electrical characteristic. Neither is it large enough to allow slow signals.

Devices with Schmitt-trigger inputs (e.g., SN74AUP1G17) have larger hysteresis, and are designed to handle the cross currents that happen for slow signals.

0 K.Yaita over 3 years ago in reply to Clemens Ladisch

Guru 29710 points

Hi TI members,

May I have TI opinion?
Is it the same with Clemens mentioned?

Best Regards,
Yaita

+1 Emrys Maier over 3 years ago in reply to K.Yaita

TI__Guru* 96742 points

Yes, Clemens is correct.

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SN74AUP1G34: Input Hysteresis