TLV3012: Propagation delay problem during cold temperature

Hello,

I am using the TLV3012AIDCKT comparator of TI.

We checked the comparator at over temperature and we found that the propagation delay(tPHL)  is more than 12.5usec when freezing the board.

Refer our schematic, I place probes as following:

Input+ Pin 3 (green on the waveform)

Input-  Pin 4 (red on the waveform)

Output Pin 1 (blue on the waveform)

At the room temperature the tPHL is less than 3.5usec.(X1 to X2 at the waveform of Delay at RT picture)

When we freeze the board the  tPHL is more than 12.5usec.(X1 to X2 at the waveform of Delay at Freeze picture)

Notes:

• Refer to tPLH (is okay), the propagation delay at  RT is about 3usec and  the propagation delay at  Freezing is about 5usec

• The input overdrive is more than 100mV (see at the pictures) and we suppose to get  6.5usec typical.

1. Why the delay (at freezing) is too long?

2. If so, what is the maximum delay (tPHL) that can appear ?

BR
Doron