7.3.2 Tristate Controls

• ITA
  Tristate Address: Input.
  When high causes the OA pin drivers to go into the high impedance state.

• ITB
  Tristate Bus: Input.
  When high causes the BB pin drivers to go into the high impedance state.

• ITD
  Tristate User: Input.
  When high causes the BD pin drivers to go into the high impedance state.