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TXS0108 B端電壓不足

Other Parts Discussed in Thread: TXB0104, SN74AXC4T774

使用TXS0108 , 將VCCA接1.8 or 3.3V; VCCB接3.3v

有無附載的狀況下,輸入4Mhz的CLK, b端輸出震幅只有左右0~1.9v

嘗試PULL UP電阻1.8k, 輸出震幅可達0.3~2.4v

但是還不是不足預期的3v左右

請問是我輸入的Rise / fall rate的問題嗎? 10ns/V???