jayachar88
Member level 3
Hello,
Would like to hold a certain number (say 8) of pins of an IC, in a combination of "floating", "high", "low" such that this combination may change over time. As for holding the pins "high" and "low", I know how to do that pretty well, via a MCU, but not sure how to hold a line "floating" ? Searching around, I found 74ABT244, which is a "Octal buffer with inverting (3-state) output". Is this the right approach ? From the data-sheet I see that 74ABT244's outputs can be controlled only in 2 groups of 4 pins each, i.e. while H/L output can be had for each pin individually, inversion was possible for entire group of 4 pins. What I need is probably an IC that allows me to invert the pins individually. Parameteric search didn't quite yield anything like that so far.
Also, this is going to require lot of GPIO pins on the MCU. Should I be considering I/O extenders for this ? Or use shift-registers ?
thanks,
Jay
Would like to hold a certain number (say 8) of pins of an IC, in a combination of "floating", "high", "low" such that this combination may change over time. As for holding the pins "high" and "low", I know how to do that pretty well, via a MCU, but not sure how to hold a line "floating" ? Searching around, I found 74ABT244, which is a "Octal buffer with inverting (3-state) output". Is this the right approach ? From the data-sheet I see that 74ABT244's outputs can be controlled only in 2 groups of 4 pins each, i.e. while H/L output can be had for each pin individually, inversion was possible for entire group of 4 pins. What I need is probably an IC that allows me to invert the pins individually. Parameteric search didn't quite yield anything like that so far.
Also, this is going to require lot of GPIO pins on the MCU. Should I be considering I/O extenders for this ? Or use shift-registers ?
thanks,
Jay