Generate a Clock Signal from a Crystal Oscillator

Figure 1-1 Using an Unbuffered Inverter and Schmitt-Trigger Inverter
to Generate a Clock Signal From a Crystal Oscillator

Design Considerations

Drive crystal oscillators directly
Can be disabled with added logic
Allows for selectable system clocks with multiple crystals
Outputs a clean and reliable square wave
See the Use of the CMOS Unbuffered Inverter in Oscillator Circuits Application Report for more information about this use case.
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Recommended Parts

Part Number	Automotive Qualified	V_CC Range	Features
SN74LVC2GU04-Q1	✓	1.65 V — 5.5 V	Dual unbuffered inverter
SN74LVC2GU04		1.65 V — 5.5 V	Dual unbuffered inverter
SN74AHC1GU04		2 V — 5.5 V	Single unbuffered inverter
SN74AUC1GU04		0.8 V — 2.7 V	Single unbuffered inverter
SN74LVC1G17-Q1	✓	1.65 V — 5.5 V	Single Schmitt-trigger buffer
SN74LVC1G17		1.65 V — 5.5 V	Single Schmitt-trigger buffer

For more devices, browse through the online parametric tool where you can sort by desired voltage, channel numbers, and other features.

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