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SN74LVC1G123: Cext pin : Tied to GND

Michiaki Tanii
Expert 4600 points
Part Number: SN74LVC1G123

Hi

 

Some similar devices directs that Cext pin should be tied to GND but our SN74LVC1G123 does not.

Why doesn’t it need to be tied to GND for SN74LVC1G123?

 

Thank you and best regards,

Michiaki

  • 0
    Guru 295240 points

    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.

    The functional diagram impluies implies that Cext is indeed connected to ground:

  • 0 in reply to Clemens Ladisch
    TI__Expert 4600 points

    Hi Clemens,

     

    Could you kindly advise the risk and concern if Cext was tied to GND ?

    Some devices which have same function should be tied to GND.

    Customer needs to make sure the risk and concern in the case of replacement to LVC1G123 from same function devices tied to GND.

     

    Thank you and best regards,

    MIchiaki

  • 0 in reply to Michiaki Tanii
    Guru 295240 points

    Another ground connection in parallel would have no effect.