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
That's where this lovely chip, the TXB0104 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)
or control lines with a lot of capacitance on them. 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!
Since this chip is a special bi-directional level shifter it does not
have strong output pins that can drive LEDs or long cables, it's meant
to sit on a breadboard between two logic chips! If you do not need
instant bi-directional support, we suggest the 74LVX245 as below which
has stronger output drive.
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!
Dimensions: 18mm x 13mm x 2mm / .7" x .5" x .08" … more
|Product type||Electronics module|
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