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See also Acceleration clause. The provisions of the U.C.C. impose equitable requirements on acceleration in the transactions it governs. The U.C.C. requirements are harmonious with the older equitable tests of reasonableness. Section 1-203 of the U.C.C. imposes an obligation of good faith on the performance or enforcement of every contract or duty within the Code. Section 1.208 further defines and applies the good faith obligation to options to accelerate at will and requires that the accelerating party 'in good faith believes that the prospect of payment or performance is impaired.' 

Texas has adopted the U.C.C.; it became effective in 1967. Section 1.208 ...