Level Shifter - 8 Channel (TXS0108E) Hookup Guide
El Duderino 
Troubleshooting
Signal Oscillations
Some users may experience oscillations or "ringing" on communication lines (eg. SPI/I2C) that can inhibit communication between devices. Capacitance or inductance on the signal lines can cause the TXS0108E's edge rate accelerators to detect false rising/falling edges.
When using the TXS0108E, we recommend keeping your wires between devices as short as possible as during testing we found even a 6" wire like our standard jumper wires can cause this oscillation problem. Also make sure to disable any pull-up resistors on connected devices. When level shifting between I/O devices, this shifter works just fine over longer wires.
The TXS0108E is designed for short distance, high-speed applications so if you need a level shifter for a communication bus over a longer distance, we recommend one of our other level shifters.
Voltage Requirements and OE
Reminder, voltage supplied to VCC_A must be less than or equal to VCC_B. Also, the breakout pulls OE LOW so make sure to tie the OE pin to VCC_A to enable the TXS0108E.
General Troubleshooting
If you need technical assistance and more information on a product that is not working as you expected, we recommend heading on over to the SparkFun Technical Assistance page for some initial troubleshooting.
If you don't find what you need there, the SparkFun Forums are a great place to find and ask for help. If this is your first visit, you'll need to create a Forum Account to search product forums and post questions.