TXB0304: spec check

GARETH OU

Part Number: TXB0304
Other Parts Discussed in Thread: TXS0104E

The original material used by the customer is NXP NTS0104GU12, Used in both AUDIO CODEC and SD CARD Because the AUDIO codec SDI output high is 2.62V, Using NTS0104GU12 will not detect, RD has evaluated TI's TXB0304RUT, but without the INTERNAL PULL HIGH resistor, Please help to confirm whether there is the same specification as NTS0104GU12, But can the material with lower VIH (same as TXB0304RUT) be recommended? ? thanks

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 318050 points

The NTS0104 is a clone of the TXS0104E.

Please show the schematic.

0 GARETH OU over 3 years ago in reply to Clemens Ladisch

Guru 11585 points

Hi Clemens

The schematic is as follows, VCC is 3.3V, VIH of TXS0104E is not low enough,

Audio codec SDI output high is 2.62V, VIH is lower than 2.62V, SD CARD requirements must be internal pull high resistance 10K ohms,

schematic application PIN 2/ PIN 10 is audio codec; others are SD CARD, Please help to confirm whether there are P2P alternatives? ?

0 Clemens Ladisch over 3 years ago in reply to GARETH OU

Guru 318050 points

The only device with internal pull-up resistors is the TXS.

Where does that 2.62 V value come from? If this is the V_OH specification of the audio codec, then you have to take into account the output current in the test specification; without a pull-down resistor, the actual output current will be near zero, so the actual output voltage will be near V_CC. See [FAQ] What is the output voltage (VOH or VOL) when the output current is X or the supply voltage is Y?

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TXB0304: spec check