If I have a bad logic IC chip that is totem pole output , how can I interface and replace it with a logic IC chip that has a open collector output. Repair technicians must get older logic TTL board with IC chips that are totem pole outputs. What does the Repair technician do when they have to replace bad IC chips that are totem pole outputs since they can't interchange and replace them with new good IC chips using open collector outputs. Does the Repair technician have to do some type of interfacing network or circuit for it to work?