Crystal oscillator having input/output pins selectively used for

Details Crystal oscillator having input/output pins selectively used for Crystal oscillator having input/output pins selectively used for

1996-10-29

1998-03-03

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331158, 331176, 331177R, 326 38, H03B 532

Patent

active

057240094

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.

REFERENCES:
patent: 5010307 (1991-04-01), Strandberg
patent: 5453719 (1995-09-01), Narahara
patent: 5563526 (1996-10-01), Hastings et al.

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