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txs0102使用中遇到的问题

Other Parts Discussed in Thread: TXS0102

这个电路图,在没有外接负载时,A端输出的波形能够在转换到B端。

但接上负载后(ps/2接口),A端与B端常为高。A端不能输出波形txs0102.

请问常为高电平时由什么引起的?怎样解决这个问题?