SN74GTLPH16912: VTT & VREF Supply Voltage

Srikanth Kacchu1

Expert 1185 points

Part Number: SN74GTLPH16912

I am planning to implement SN74GTLPH16912GR in one of our design.to convert from GTLP to LVTTL and vice-versa.

It is given in datasheet that VREF = 1V and VTT = 1.5V. Device has VREF pin but there is no VTT pin.

Can anyone help to know what is VTT & VREF to what to give input to VREF pin of the device?

Regards

Srikanth Kacchu

over 4 years ago

0 Karan Kotadia over 4 years ago

TI__Genius 16725 points

Hi Srikanth,

The GTL input receiver is a differential comparator with one side connected to the externally provided reference voltage, VREF.The threshold is designed with a precise window for maximum noise immunity (VIH= VREF + 50 mV and VIL = VREF – 50 mV).

VTT is the output supply voltage of your device.

Please refer to this Appnote on GTL devices: https://www.ti.com/lit/an/scea003a/scea003a.pdf

Thanks!

-Karan

0 Srikanth Kacchu1 over 4 years ago in reply to Karan Kotadia

Expert 1185 points

Hi Karan

I understand to connect VREF = 1V as per datasheet. Am I correct?

Regards

Srikanth Kacchu

0 Karan Kotadia over 4 years ago in reply to Srikanth Kacchu1

TI__Genius 16725 points

Hi Srikanth,

Yes, it is recommended to be set at the voltage.

Thanks!

-Karan

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SN74GTLPH16912: VTT & VREF Supply Voltage