Most Basic Doubt Of Digital Electronics!!!

[docel]

Hello Guys!
1. Logic levels are comparative and are system specific. Meaning, the Hi (1) and Lo (0) states are Voltage , current or Charge levels representing presence or absence of the specific units.

2. The present day technology is fast approaching 2V maximum levels , due to the evolution of low voltage battery systems.
At present, the Mobile phones operate at a power voltage around 3.6V cells. This would mean that the Logic voltage must swing between 0v - 3.6v. In reality, the Max voltage will be slightly less than the supply voltage.

3. The TTL levels of 5V have almost disappeared from serious personal/mobile gadgets.

The levels are summarised in this document: Logic Voltage Thresholds for TTL, CMOS, LVCMOS, and GTLP IC's

[sauravgoswami]

Hello Guinesses!!....A voltage is a voltage,it depends on the circuit how it takes,a digital device will take it as you design it and do accordingly,similar for Analog circuits too....The new devices in market follow low-consumption,high-performance principle which is need of the hour.Its upto the Application,wat u want to do!!!