Hi guys,

I was wondering if I shoud use a pull up resistor in this case?

Pin 1 is a enable pin for the mux input A (active low). I would send a logic low from the microprocessor to enable it.

 

What's the part number and where is the specsheet?

 

This is the spec sheet:

http://www.pericom.com/pdf/datasheets/PI5V331.pdf

Thanks!

 

There isn't a word about Enable on that specsheet, except 1 is disable and 1 is at least 2 volts. I would guess the next step is to search Pericom for the "family" characteristics...unless somebody else here knows the answer.

 

I believe when ENa is low, all of the A switches (s1a, s2a, s3a, s4a) are enabled. Vice versa for ENb.

From there, depending on the value of IN1 and IN0, you can have specific switches go off and on.

 

This app note in the PI5 family shows a 4.7k pull up resistor.

 

Hi Guys..!!

Pins with TTL logic family shud always be pulled- high or low through a resistor...
The value of the resistor depends on wat voltge ur r connecting the resistor to and also on the sink curent capacity of the IC...
If TTL pins are left open/float they act as antennas.

Hence u should connect a pull-up resistor to the pin