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8-channel Bi-directional Logic Level Converter - TXB0108

8-channel Bi-directional Logic Level Converter - TXB0108
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 8-channel Bi-directional Logic Level Converter - TXB01088-channel Bi-directional Logic Level Converter - TXB0108 
Our Price:  £7.98(Inc. 20% VAT)(£6.65 Exc. VAT)Earn 7 Loyalty Points
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SKU:  PPADA395
Part Number:  395
Brand:  AdaFruit

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  (1 Review)

Because the Arduino (and Basic Stamp) are 5V devices, and most modern sensors, displays, flash cards and modes are 3.3V-only, many makers find that they need to perform level shifting/conversion to protect the 3.3V device from 5V.

Although one can use resistors to make a divider, for high speed transfers, the resistors can add a lot of slew and cause havoc that is tough to debug. For that reason, we like using 4050/74LVX245 series and similar logic to perform proper level shifting. Only problem is that they are only good in one direction which can be a problem for some specialty bi-diectional interfaces and also makes wiring a little hairy.

That's where this lovely chip, the TXB0108 bi-directional level converter comes in! This chip perform bidirectional level shifting from pretty much any voltage to any voltage and will auto-detect the direction. Only thing that doesn't work well with this chip is i2c (because it uses strong pullups which confuse auto-direction sensor). If you need to use pullups, you can but they should be at least 50K ohm - the ones internal to AVRs/Arduino are about 100K ohm so those are OK! Its a little more luxurious than a 74LVX245 but if you just don't want to worry about directional pins this is a life saver!

This breakout saves you from having to solder the very fine pitch packages that this chip comes with. We also add 0.1uF caps onto both sides and a 10K pull-up resistor on the output enable pin so you can use it right out of the box!


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Rapberry pi to 5V without an issue.
Friday, 4 March 2016  |  Sandy

I interfaced a control system to my Pi, so had to convert 3.3V to 5V, I even managed to add some feedback from the LEDs on the system, I now have a web interface for my old CNC system.

 

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