Si530 OE Pull-up Resistor Verification

12/340/2013 | 10:45 PM

Question

How can one verify the presence of the Si530's OE internal pull-up resistor?

Answer

The Si530 crystal oscillator includes a 17 kOhm internal resistor from the OE (Output Enable) pin to VDD. However, you can't simply pick up a sample Si530 and measure the resistance between the OE and VDD pins. This is because the device must have power applied. The device's factory configuration is enabled on power-up.

The presence of the Si530's OE internal pull-up resistor can best be verified based on OE polarity. For example, if the P/N's OE polarity is OE active high, the device will yield an output even if OE is unconnected. Only driving OE LOW will disable the part's output clock.

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Si530 OE Pull-up Resistor Verification

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