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Connections mirrored TXB0108

Other Parts Discussed in Thread: TXB0108

Hi,

I've got a SAM3U connected (UART) to a 3G modem using the TXB0108.

VCCA = 1.8V

VCCB = 3.3V

TX and RX pins exhibit some sort of 'mirroring'.

My scope shows the driven pin as expected, but the other pin goes between 1V and 3V with the data.

There are no external pullups/pulldowns.

I can't work out why I'm getting this strange crosstalk behaviour.

Thanks