SN74CBT16211C: for TFT-LCD module data bus

Sam Ting

Part Number: SN74CBT16211C
Other Parts Discussed in Thread: SN74CBTLV16292

Hi team,

Could you please recommend a suitable 1:2 bus switch for TFT-LCD module (R0-R7, G0-G7 and B0-B7 data signals, 24 bits)? Thanks!

Best regards,

Sam Ting

over 5 years ago

0 Clemens Ladisch over 5 years ago

Guru 284840 points

What are the signal voltage and frequency?

Will the switch need to be powered down?

0 Sam Ting over 5 years ago in reply to Clemens Ladisch

TI__Expert 3210 points

Hi Clemens,

The signal is 1.8V logic and 25MHz.

What's the feature of powered down?

Best regards,

Sam Ting

0 Kate Dickson over 5 years ago in reply to Sam Ting

TI__Expert 5660 points

Hi Sam,

I think Clemens was asking if the feature of Powered-off protection is needed. A device with powered-off protection (or isolation during power off) ensures that the I/O path is in the high-Z state when Vcc = 0V. This feature protects the system and device against back-powering events and eliminates the need for power sequencing. You can read more about powered-off protection in this article.

We do not have a 24-bit 2:1 mux, but we can think about another solution. For your application, can all 24 bits be controlled by the same select line? If so, I can recommend using two 12-bit 2:1 muxes, such as SN74CBTLV16292, which has powered-off protection.

Do you also need 1.8V compatible logic select pins?

Thanks!

Regards,

Kate

0 Sam Ting over 5 years ago in reply to Kate Dickson

TI__Expert 3210 points

Hi Kete,

The select logic can be 3.3V. Thanks for your support!

Best regards,

Sam Ting

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SN74CBT16211C: for TFT-LCD module data bus