Integrated circuit device

Details Integrated circuit device Integrated circuit device

2008-07-15

2008-07-15

Hirshfeld, Andrew H (Department: 2858)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

C324S076530, C324S076480, C324S1540PB

Reexamination Certificate

active

11468699

ABSTRACT:
An integrated circuit device comprises internally on-chip an oscillator with a signal output. The device has a reference clock input, a first counter with a count input, a control input and a counter output, a second counter with a count input, a control input and an overflow indication output, and a test control logic circuit. The count input of the first counter is connected to the signal output of the oscillator. The count input of the second counter is connected to the reference clock input. The overflow indication output of the second counter is connected to an input of the test control logic circuit. The test control circuit has an output connected to the control input of the first counter to apply a stop counting control signal to the first counter after it has received an overflow indication signal from the second counter. The first counter after it has received a stop counting control signal provides a count at the counter output which is indicative of the output frequency of the oscillator. The device includes all the hardware necessary to perform an on-chip test of the oscillator, thereby obviating the need for serial testing on sophisticated and expensive test equipment.

REFERENCES:
patent: 4374358 (1983-02-01), Hirose
patent: 5381085 (1995-01-01), Fischer
patent: 6396889 (2002-05-01), Sunter et al.
patent: 6557117 (2003-04-01), Wu et al.
patent: 6622106 (2003-09-01), Rocchi et al.
patent: 2004/0053595 (2004-03-01), Shinbo et al.

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