4MHz Crystal Oscillator

4.000MHz Crystal Oscillator HC-49/S
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It provides clock pulses of 4 Mhz frequency.
Excellent accuracy
Wide operating temperature
Excellent long-term stability
Standard low profile case
Inexpensively priced
It can be used as UART clock (6×1.8432 MHz).
It allows integer division to common baud rates (96×115200 baud or 96×96×1,200 baud).
It is a common clock for AVR microcontroller.
It uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency. This frequency is commonly used to keep track of time, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers. The most common type of piezoelectric resonator used is the quartz crystal, so oscillator circuits incorporating them became known as crystal oscillators.
The crystal oscillator circuit sustains oscillation by taking a voltage signal from the quartz resonator, amplifying it, and feeding it back to the resonator.
A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency.
4 MHz crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with 4 MHz frequency.

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