If you were a keen reader of electronic text books you might have read about different voltage levels tolerated by 4000 series CMOS gates ... used the familiar 5 volts. This happy state of ...

As CMOS technology came of age and got faster and ... The TTL signal levels are usually the same, or very close for both “standard” 5 volt TTL and for low voltage 3.3 volt TTL, often referred ...