PCA9306-Q1: When Vcc2 = Vcc1 what is Vth range for EN?

Justin Bohr

Part Number: PCA9306-Q1

Tool/software:

Hi Team,

In a scenario such as figure 9-5 in the PCA9306-Q1 datasheet where Vcc2 = Vcc1, or Vref2 = Vref1, what are the thresholds for EN?

Thanks,

Justin

over 1 year ago

0 Michael Ikwuyum over 1 year ago

TI__Guru 51636 points

Hi Justin,

0.6 V, thanks.

Best Regards,

Michael.

0 Justin Bohr over 1 year ago in reply to Michael Ikwuyum

TI__Mastermind 27990 points

Thanks Michael,

What would be the Enable/Disable Thresholds? Understood on the Vth is 0.6V (my bad on the wording of the question), but most of the application examples say that the min High value for EN is Vref1+Vth. if Vref1 = Vref2 what is the min value for a logic high, and the max value for a logic low?

Justin

0 Clemens Ladisch over 1 year ago in reply to Justin Bohr

Guru 317260 points

The EN pin is an analog pin and does not really have thresholds. The EN pin is connected directly to the gates of the pass transistors, so the I/Os are clamped at EN − Vth. To disable the I/Os, EN should be much lower than 0.6 V; to enable the I/Os, EN should be much higher than 0.6 V. (For a high input voltage, the switch is open, and the output voltage is determined by the pull-up resistor at the output.)

Also see [FAQ] How do the LSF translators work?

Interface

Interface forum

PCA9306-Q1: When Vcc2 = Vcc1 what is Vth range for EN?