Need more outputs on my arduino mega ! (yes ... i know ...)

Using Arduino LEDs and Multiplexing
15

Yes, it is possible that i use th TPIC6C595 directly to power up the relays coils.
The relays coils are 12V DC.
I will add a reverse diode to avoid feedback current to flow where it shouldn't goes.

You're telling me that i have to add a capacitor across "Vcc" and "GND" pins of each TPIC6C595 ?

Reading the datasheet, it shows that a resistor and a capacitor should be used on each output ... ?!?! I just don't understand if i have to do it or not ?

By the way, how do i drive the 2nd TPIC6C595 connected on the SerialOut of the 1st TPIC6C595 ?

Thanks !