电路设计如下图所示,当器件不供电时,B port可以认为是Floating的状态吗?如果不是是什么状态?是否可以提供内部结构图?
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您好,
SN74LVC8T245 具有Partial-Power-Down 和 Vcc Isolation特性,如下datasheet 截图所示,如果您的供电电源不供电时满足VCC=0V,那么输出就是高阻态的,或者说Floating的状态,更多Partial-Power-Down信息见此 FAQ链接的网页后半部分描述:https://e2e.ti.com/support/logic-group/logic/f/logic-forum/723607/faq-can-the-input-voltage-vi-to-my-logic-device-be-higher-than-the-supply-voltage-vcc
其输入输出结构见下面文档,如下截图是其输出电路:
Low-Voltage Logic (LVC) Designer's Guide