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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/1181399/sn74lvcc4245a-sn74lvcc4245adbre4---need-pin-configuration-info
NC 引脚有什么作用？ 当连接到某个设备时、它的表现如何？ 或者、请告诉我们它必须如何连接... 谢谢！
NC 引脚未连接；无论您如何处理该引脚、都没关系。
但 SN74LVC8T245等其他电平转换器在该引脚上具有 VCCB、因此最好将其连接到 VCCB 以更换芯片。
