SN74LVC2G125: PIN4&5 short circuit

user6478535

Prodigy 30 points

Part Number: SN74LVC2G125

HI,

After several times of hot swap, the 4 pin and 5 pin of sn74lvc2g125 are short circuited.

I want to know what the problem may be.

The schematic is as follows:

(The left is connected to the CPU and the right to the backplane)

over 3 years ago

0 Emrys Maier over 3 years ago

TI__Guru* 96681 points

Hello,

The most likely cause of damage from what I see would be excessive voltage.

When hot-swapping, is the connection order GND -> VCC -> DATA (ie different length pins)? Also, have you looked at the waveforms for the input during a hot-swap event?

0 user6478535 over 3 years ago in reply to Emrys Maier

Prodigy 30 points

sorry,the length of the pins is the same.

Druing hot-swap,a microsecond pulse will be generated.The max value is 7.5V,and the min value is -3.5V.

0 Emrys Maier over 3 years ago in reply to user6478535

TI__Guru* 96681 points

Both of those are beyond the absolute maximum ratings of the part and could cause immediate damage.

Logic

Logic forum

SN74LVC2G125: PIN4&5 short circuit