Crystal oscillator having input/output pins selectively used for analog or digital signals
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United States of America Patent
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Mar 3, 1998
Grant Date -
N/A
app pub date -
Oct 29, 1996
filing date -
Oct 29, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital temperature compensated crystal oscillator (10) with pin multiplex control which includes: four analog I/O pins, a signal multiplex method which allows switchable digital communication via at least two of the analog I/O pins (20,28), and an external mode selector (12) which operates through the power leads. Changes in the power voltage level selects the TCXO (10) to operate in a normal or communication operating mode. In the normal operating mode the TCXO operates in a normal analog manner. In the communication mode, the analog functions of the I/O pins (20,28) are switched out and digital functions are allowed on the same I/O pins (20,28). The use of the same I/O pins (20,28) for switchable analog and digital signals saves size and cost, and prevents the inadvertent access to the digital functions of the TCXO (10) by customers in the field.
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