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[FAQ] Can I connect the Cext pin to ground on a monostable multivibrator?

Emrys Maier
Guru* 96842 points
Other Parts Discussed in Thread: SN74LV221A, SN74LVC1G123, SN74LV123A, SN74221, SN74LS221

FAQ: Logic and Voltage Translation > Monostable Multivibrators >> Current FAQ

For the majority of MMV devices, yes, the Cext pin can be grounded.

The Cext pin is internally grounded on many MMV's in TI's portfolio. Grounding this pin externally does not cause any negative impact on these devices. These include, but are not limited to, SN74LVC1G123, SN74LV123A, and SN74LV221A.

Some older devices should not have the Cext pin grounded.

The SN74221 and SN74LS221 are two examples in which the Cext pin should not be grounded externally, as described in the datasheet:

If you are looking to use a particular MMV that isn't covered above, please "Ask a related question" with the orange button at your top right. We can verify for you if the datasheet is unclear.

If you would like to learn more about monostable multivibrators, please visit: