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请问sn74aup1g00为什么会输出三角波?

Other Parts Discussed in Thread: SN74AUP1G00

sn74aup1g00,VCC=1.2V, A 输入 25M clk,B输入上拉,Y输出三角波。因为我们芯片输入 等效电容太大了吗?pin4 接芯片的输入,开始在与非门的输出和我们芯片输入中间有个100nF电容做AC 耦合,我以为是电容容值太大,改为10nF ,1nF ,22pF,去掉电容直连 都是三角波。R1658 目前用的 0 欧姆