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LM393比较器使用疑问

Other Parts Discussed in Thread: LM393

LM393在正负输入差模电压小于一定程度时,输出呈线性。举例说明,+端输入2V,-端输入1.9V,按常理输出在外部有上拉5V的情况下,输出为5V,但是实际测量其实只有3V多,感觉内部的MOS管并没有饱和,导致输出呈线性。

我想了解下,lm393手册上哪个参数是表示正负输入压差大于多少值LM393可以正常工作,谢谢