Patent ID: 8222964

Claim:
Apparatus comprising: a substrate including outer surfaces, one of the outer surfaces defining a first plurality of electrical contacts, one of the outer surfaces adapted to be mounted to a circuit board and defining a second plurality of electrical contacts adapted to be electrically connected to the circuit board; an integrated circuit die mounted to one of the outer surfaces of the substrate, a crystal oscillator mounted to one of the outer surfaces of the substrate and electrically connected to the integrated circuit die, the crystal oscillator comprising: a mechanical resonator; and a case mounted to one of the outer surfaces of the substrate and within which the mechanical resonator of the crystal oscillator is disposed, first circuitry including circuitry to receive an oscillating signal supplied by the crystal oscillator, to generate a feedback signal based at least in part on the oscillating signal, and to supply the feedback signal to the crystal oscillator, the first circuitry comprising: circuitry to generate a clock signal based at least in part on the oscillating signal and to supply the clock signal to at least one circuit of the integrated circuit die, and a terminal to receive an alternative clock signal that is not generated based at least in part on the oscillating signal supplied by the crystal oscillator.