I am designing a small device with two MAX485 chips.
Do they need the decoupling capacitors on the 5V power?
I am designing a small device with two MAX485 chips.
Do they need the decoupling capacitors on the 5V power?
Yes. All almost ICs need decoupling capacitors. Devices such as these '485 drivers especially need them due to the current surges the device experiences when switching the signal states to the low value termination resistors used on the bus lines.