Hi team,
My customer has some questions about this deivice. In the datasheet, it says as below:
The I/O port of this device has a pullup current source that maintains the output voltage at VCC when the device
is ON, and the input is greater than or equal to VCC – 1. Because of the pullup current source, the output voltage
level may be less than VCC when the operating frequency is low and the I/O port is connected to a pulldown
resistor. In order to maintain the output voltage at VCC, a pullup resistor must be connected to VCC instead of a
pulldown resistor to ground.
[Question]
(1) Is it correct to understand that the IC have a pull-up current source on either port that keeps the output voltage at VCC? In other words, when the switch is turned on, both the left and right sides are pulled up.
(2) Could you tell us the value for the pull-up resistor? I want to know roughly how much it is (thousands of k Ω, a few k Ω, etc.).
(3) When turned off, it the output not connected to the oull up current source that maintain the VCC? In other words, it doesn't pull up when switched off?
Regards,
Ohashi