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CD74HC4046求频率的公式是怎样的,怎么配置?

我之前看到安森美的一款4046有个公式,发现代入进去部分对的,部分离谱。

TI的CD74HC4046只看到规格书里有几个图,其求频率的公式是怎样的,怎么配置?