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SN74LV123A: Wrong GND connection to Cext pin

Oba
Genius 17325 points
Part Number: SN74LV123A

Hello,

My customer made their own prototype with SN74LV123A.
Then they found a wrong connection on Cext pin.

They wrongly connect this pin to GND directly like the below.



This is obviously different usage from the datasheet description.
But as far as they evaluated, it worked well.

Does connecting Cext to GND have any problem?

 

Regards,
Oba

  • 0
    Guru 317150 points

    The FAQ in Designing With the SN74LVC1G123 Monostable Multivibrator says:

    5.6 Can I connect the Cext pin to ground?

    It is best to follow the datasheet recommendations. If your monostable multivibrator recommends not connecting Cext to ground, then do not connect it to ground.

    In some monostable multivibrators the Cext pin is internally tied to ground, but in some it is not. If the datasheet is unclear and the information is required, use an ohmmeter to check the resistance between the two pins. If the resistance reads less than 1 Ω, it is safe to connect both to ground.