Hi,
My basic knowledge of FET's really isn't that good, but I'm doing some research, so don't worry, I'm not after theory, google has (almost) everything. If you want to skip the waffle, see below.
I have an app dealing with ttl logic. I need to have a 2-input selector for an input pin, one that can be disabled, tristate output. Its basically an over complicated 'logic' circuit for interfacing LCD's via serial SPI-like connection, using a shift-register. It'll be able to deal with both 4 and 8 bit modes. I need to switch the RS line from being on the serial data (set after data byte is sent)...to being one of the SR's outputs. (4-bit mode, send two bytes, with RS being one of the unused data bits).
Sounds complicated, but I can't for the life of me find a single logic IC that will do everything. So...considering I only need to 'switch' one line here Would two FET's safice? (also using a buffer to disable the 4-unused inputs, to prevent screw ups). A single buffer disables all inputs to the LCD making them high-Z, allow for a direct parallel connection (straight through)...that gives 3 options for interfacing.
Aside from the app, I'm also just curious...of course CMOS is made of MOSFETS, so for very small apps, could a single one of these act as a 'tristate' switch? That is...enable...and the output becaomes the input, 1 or 0, and disable, and its output is high Z. I mean, I'm pretty sure thats the case, just need conformation. Might come in handy for routing single data lines when I can't get hold of an IC.
Cheers,
Blueteeth.
My basic knowledge of FET's really isn't that good, but I'm doing some research, so don't worry, I'm not after theory, google has (almost) everything. If you want to skip the waffle, see below.
I have an app dealing with ttl logic. I need to have a 2-input selector for an input pin, one that can be disabled, tristate output. Its basically an over complicated 'logic' circuit for interfacing LCD's via serial SPI-like connection, using a shift-register. It'll be able to deal with both 4 and 8 bit modes. I need to switch the RS line from being on the serial data (set after data byte is sent)...to being one of the SR's outputs. (4-bit mode, send two bytes, with RS being one of the unused data bits).
Sounds complicated, but I can't for the life of me find a single logic IC that will do everything. So...considering I only need to 'switch' one line here Would two FET's safice? (also using a buffer to disable the 4-unused inputs, to prevent screw ups). A single buffer disables all inputs to the LCD making them high-Z, allow for a direct parallel connection (straight through)...that gives 3 options for interfacing.
Aside from the app, I'm also just curious...of course CMOS is made of MOSFETS, so for very small apps, could a single one of these act as a 'tristate' switch? That is...enable...and the output becaomes the input, 1 or 0, and disable, and its output is high Z. I mean, I'm pretty sure thats the case, just need conformation. Might come in handy for routing single data lines when I can't get hold of an IC.
Cheers,
Blueteeth.