Level Shifter Ic 1 8v To 3 3v. The ic level shifter like the discrete level shifter the ic level shifter uses the same level shifting technique covered in the level shifting section but is instead integrated in the form factor of a small chip. For the 1 8v to 3 3v operational direction you can easily make a level translator with a couple of transistors and resistors.
As the trend in low voltage microcontrollers migrates to 1 8v logic levels i2c bus systems will need logic level shifting to communicate with 3 3v i2c slave devices. The pca9306 device is a dual bidirectional i 2 c and smbus voltage level translator with an enable en input and is operational from 1 2 v to 3 3 v v ref1 and 1 8 v to 5 5 v v ref2. The output level is referenced to the supply voltage and is able to support 1 8v 2 5v 3 3v 5v cmos levels.
Texas instruments sn74lv1t34 buffer logic level shifter is a low voltage cmos gate logic that operates at a wider voltage range for industrial portable and telecom applications.
For the 1 8v to 3 3v operational direction you can easily make a level translator with a couple of transistors and resistors. Adafruit industries unique fun diy electronics and kits 8 channel bi directional logic level converter txb0108 id. Logic level translator 7 typical operating characteristics vcc 3 3v vl 1 8v rl 1mω cl 15pf ta 25 c data rate 500kbps in open drain operation and 8mbps in push pull operation unless otherwise noted vl supply current vs. 395 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.
