I am currently nearing the completion of my 8-bit TTL computer and have incorporated the use of buffers in the 74HC541 for isolating signals in the control unit. For example, a single output enable can be receiving inputs from multiple chips, yet each chip also wants to enact another function yet doesn't want it to be enabled by the outputs of the other chips.
Hence I attached the outputs of the devices connected to the output enable of this device to the inputs of the 74HC541 octal buffer and connected all the outputs together. Hence I believe this should act as an 8 input OR gate where the inputs are isolated and unaffected by each other's state. The 74HC541 has it's enabled pins set to a constant LOW meaning that it's buffers will always be enabled to output.
But one thing I just wanted to clear up was the idea of how sourcing and sinking works. I know that with a transistor or a buffer, if you set the collect to logical low and connect the emitter to the cathode or an LED whose anode is connected to 3.3V, the LED will be able to light up since the output of the transistor/buffer acts like a ground or 0V terminal for the LED, allowing it to complete the circuit. And it is understood that this 3.3V signal will not be able to make it's way to the collector of the buffer since the buffer is acting like a diode.
But if I have a group of buffers whose inputs are set to logical low and their outputs connected together, if one of the inputs were set to logical high, which signal would be pulling the other. In general, would the buffer with the 5V input pull up the outputs of all the other buffers whose output is logical low, and one what condition would one buffer outputting logical low pull down the outputs of all the other buffers if they were at logical high?
So that's that and thank you for your help.
Hence I attached the outputs of the devices connected to the output enable of this device to the inputs of the 74HC541 octal buffer and connected all the outputs together. Hence I believe this should act as an 8 input OR gate where the inputs are isolated and unaffected by each other's state. The 74HC541 has it's enabled pins set to a constant LOW meaning that it's buffers will always be enabled to output.
But one thing I just wanted to clear up was the idea of how sourcing and sinking works. I know that with a transistor or a buffer, if you set the collect to logical low and connect the emitter to the cathode or an LED whose anode is connected to 3.3V, the LED will be able to light up since the output of the transistor/buffer acts like a ground or 0V terminal for the LED, allowing it to complete the circuit. And it is understood that this 3.3V signal will not be able to make it's way to the collector of the buffer since the buffer is acting like a diode.
But if I have a group of buffers whose inputs are set to logical low and their outputs connected together, if one of the inputs were set to logical high, which signal would be pulling the other. In general, would the buffer with the 5V input pull up the outputs of all the other buffers whose output is logical low, and one what condition would one buffer outputting logical low pull down the outputs of all the other buffers if they were at logical high?
So that's that and thank you for your help.