SN74AHCT1G125: tTLH/tTHL parameters in SN74AHCT1G125

Shu-Cheng LIN

Guru 11785 points

Part Number: SN74AHCT1G125

Hi Sirs,

Sorry yo bother you.

As title, could you help check tTLH/tTHL parameters in SN74AHCT1G125

Thanks!!

over 7 years ago

0 Emrys Maier over 7 years ago

TI__Guru* 97066 points

Hello Shu-Cheng,
Under what conditions do you need to know the output transition rate?

0 Shu-Cheng LIN over 7 years ago in reply to Emrys Maier

Guru 11785 points

Hi Sirs,

We measured VGA signal (HSYNC/VSYNC) that were fail. (rise time specification is 12 ns)

The below picture are our schematic and measurement result

You can compare rise time at U9 pin2 and U9 pin4, the input rise time was pass, but output rise time was fail.

0 Emrys Maier over 7 years ago in reply to Shu-Cheng LIN

TI__Guru* 97066 points

Hi Shu-Cheng,
There's a very complex load on the device. If you want to know the rise time of our device only, I would recommend removing R121 and R119 and measuring at the output of the device with an active probe (1pF).

Logic

Logic forum

SN74AHCT1G125: tTLH/tTHL parameters in SN74AHCT1G125