TXB0108B Overdrive

KANJI SHIBATANI

Mastermind 6205 points

Other Parts Discussed in Thread: TXB0108

Hello

My customer is designing HD audio equipment for their product using TXB0108.

I can see the desciption about the external system driver current requirement +/-2mA in the

App note (scea043.pdf)

http://www.tij.co.jp/jp/lit/an/scea043/scea043.pdf

Anyway,

The ICH deivce which as the capabirity of +/-2mA

In the spec. of HD Audio , Fig37/Fi38 in below,

http://www.intel.com/content/dam/www/public/us/en/documents/product-specifications/high-definition-audio-specification.pdf

・DC output drive -0.5mA/+1.5mA
・AC swicthing 9.38mA(min)

My understanding of TXB0108B 's requirement +/-2mA for overdrive is, not DC spec, but AC spec,

isn't it?

Please adivce.

Best Regards

over 10 years ago

0 Emrys Maier over 10 years ago

TI__Guru* 97046 points

Thank you for your post. I am moving it to the Voltage Level Translation Forum for the best support.

0 Jennifer Joseph over 10 years ago

TI__Intellectual 2530 points

Hi
The external drive requirements is also mentioned on page 13 of the datasheet .
2mA is not continuous and is only required during active switching. The peak current is during switching (HIGH to LOW or LOW to HIGH). 2mA of drive strength is required on IO lines to be able to override the buffer's output. Once the internal buffers are overridden, the driver only sources/sinks minimal current.
Thanks

0 KANJI SHIBATANI over 10 years ago in reply to Jennifer Joseph

Mastermind 6205 points

Thank you very much!

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TXB0108B Overdrive