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利用XC6206-2.5给CD74HC125供电,当CD74HC125使能OE端电压(5.2V)超过电源电压(2.5V)时,LDO输出会被抬升至4.5V左右。

Other Parts Discussed in Thread: CD74HC125

Hi,

我在用XC6206-2.5这款LDO产生2.5V电压给CD74HC125供电,当CD74HC125使能引脚OE的输入为5.2V时,电流会被倒灌至电源端,使得电源电压上升至4.5V左右,差值为0.7V。

按理说OE至电源应该有二极管防止倒灌,但是这里却出现了类似的现象,请各位大牛解答疑惑。如果能有CD74HC125的晶体管级别的原理图就更好了,谢谢大家!

B.R.

Longyu