Other Parts Discussed in Thread: SN74AVC4T245
One of my customers is considering using SN74AXC4T245 for their new products.
They have the following questions. Could you please give me your reply.
Q1, The follwoing URL says in case of SN74AXC4T245, very weak pulldown resister is connected to each signal pins.
What is the resister values of internal pulldown resister connected to each signal pin?
The customer is going to attach very small external pullup resister because some circuits input which connected to output pins is needed to be kept high level.
So if the internal resister value is small, the external pullup needs to be small value to keep high level.
Q2. Is the internal pulldown resister connected to GND anytime?
Or is each pin connected to GND by the internal pulldown resister when either VCCA or VCCB is powered off only?
Q3. What is "VCC Isolation" function?
The device datasheet says that if either VCC Input is Below 100 mV, All I/Os Outputs are Disabled and Become High-Impedance.
I think this function is implemented to SN74AVC4T245 too.
Could you please tell me what is the different point? Is it the internal pulldown resister?
Your reply would be much appreciated.