Input buffer and method of operating the same

Details Input buffer and method of operating the same Input buffer and method of operating the same

2007-05-15

2007-05-15

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S086000

Reexamination Certificate

active

10957318

ABSTRACT:
An improved input buffer providing configurable single-ended and differential signaling capability, comprising an input signal comparator, a first pad connected to one input of the comparator. An internal reference voltage source may be connected to one terminal of a first selection switch. The second terminal of the first selection switch is connected to the second input of the comparator and one terminal of a second selection switch is connected to the second input of the comparator. Further, a second input pad is connected to the second terminal of the second selection switch. The invention also includes a mode selector that enables the first selection switch and disables the second selection switch for providing single-ended operation using the internal reference voltage source, or enables the second selection switch and disables the first selection switch for enabling differential operation or single-ended operation using an external voltage reference.

REFERENCES:
patent: 4714875 (1987-12-01), Bailey et al.
patent: 4829200 (1989-05-01), Downey
patent: 5744995 (1998-04-01), Young
patent: 6429680 (2002-08-01), Jeffery et al.

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