Hello,
I am trying to design a circuit that allows me to connect pin A9 of the Eprom 27c256 memory to use the identity mode but I have a problem this mode needs a voltage of 12.5 V and pin A9 is assigned to a data bus from another circuit that allows me to select the address of the Eprom memory for the programming and reading mode, then I came to the conclusion that this circuit must have TTL inputs and outputs 0v, 12.5v and hi-z (it will allow me to disconnect the circuit so that it does not interfere with the data bus).
I think that in totem pole circuit maybe it would work but I don't know how to do the complete circuit.
I'd appreciate your help
output totem pole circuit:
I am trying to design a circuit that allows me to connect pin A9 of the Eprom 27c256 memory to use the identity mode but I have a problem this mode needs a voltage of 12.5 V and pin A9 is assigned to a data bus from another circuit that allows me to select the address of the Eprom memory for the programming and reading mode, then I came to the conclusion that this circuit must have TTL inputs and outputs 0v, 12.5v and hi-z (it will allow me to disconnect the circuit so that it does not interfere with the data bus).
I think that in totem pole circuit maybe it would work but I don't know how to do the complete circuit.
I'd appreciate your help
output totem pole circuit: