Hi,
Yes. Generally you need to decouple (stabilize for current spikes) power supply.
It's a good idea to place a fast ceramics capacitir at each supply pin of each IC....with low impedance connection to the GND plane.
It should be common knowledge, but here it is additionally mentioned in the datasheet:
Section:
5 Pin Configuration and Functions
--> Locally decouple to VSS using low ESR/ESL capacitor, located as close to IC as possible.
Ah, yes, a GND plane should be mandatory for high speed switching (high dV/dt) high current applications.
Klaus