I'd use a 74LCV1T45 in say SOT-23 (TI SN74LVC1T45DBV*) for this, with pin 1 (VCCA) connected to Teensy 3.3V, pins 2 (GND) and 5 (DIR) to ground, pin 3 (A) to Teensy input pin, pin 4 (B) to LBO, and...