From email:
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What voltage on the VCC pin guarantees the device switch is off? So as VCC falls from 3.3V to GND when does the switch turn off.
I do not see any specification or curves for this scenario. It would be the equivalent of the /OE connected to GND and the VCC ramped down.
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Regards,
Sonia
Sonia,
Based on the datasheet Vcc = 0V guarantees the switches is off or setting the logic control to turn off a signal.
You can see this guarantee in the Ioff spec that states <10 uA leakage on the signal path when Vcc = 0V.
You can also guarantee the switch is off by setting the OE pin > the Vih min 1.7V or 2V depending on the supply voltage.
The SN74CB3QXXXX devices include a charge pump on the gate of the FET switch so there is likely a voltage threshold on the Vcc when the charge pump turns on and biases the gate of the FET switch. (more information on SN74CB3QXXXX switches see application report CBT-C, CB3T, and CB3Q Signal-Switch Families)
Unfortunately we have not characterized the Vcc pin to guarantee a voltage the device turns off other than 0V. How are you using this part in your system? Is there a particular situation in your application where knowing this value is critical?
Thank you,
Adam
