The difference between crystal oscillator and crystal:

1) Crystal oscillator is the abbreviation of active crystal oscillator, also called oscillator. The English name is oscillator. Crystal is the abbreviation of passive crystal oscillator, also called resonator. The English name is crystal.

2) Passive crystal oscillator (crystal) is generally a non-polar component with two pins inserted directly. It requires the help of a clock circuit to generate an oscillation signal. Common ones include 49U and 49S packages.

3) Active crystal oscillators (crystal oscillators) are generally surface-mounted packages with four pins. They have a clock circuit inside and can generate an oscillation signal simply by supplying power. Generally divided into several packaging forms: 7050, 5032, 3225, and 2520.

1. The crystal is passive, usually with two pins, and requires an external circuit to start the oscillation. An ordinary microcontroller requires an external crystal and two capacitors;

2 , The crystal oscillator is active (also called active crystal oscillator) and can be considered as a combination of crystal and peripheral circuits. Generally there are four legs. Some active crystal oscillators have single-ended output and some have differential output.