You'll have to take steps to scale the voltage down to the BBB's 3.3 V I/O level. The best way to do this is with dedicated voltage-level translator ICs. But depending on your application, you might be able to get away with current-limiting resistors in series from the 74xx output to the GPIO (you'll have to do some work to find the right value), and with the right 74xx selection, you won't need to put anything between BBB outputs and 74xx inputs (that will depend on what the 74xx Vhi threshold is).
Or maybe you can use 3.3 V 74xx variants. > On Mar 10, 2015, at 10:50 , [email protected] wrote: > > Hi, > > I come from the world of sotware engineering and I am a newcomer (nearly) to > the world of electronic. I would like to know if it was possible to interface > a 74LS02 to the BeagleBone Black. > > I plan to connect Vcc and Vss of the 74LS02 to the 5V Vdd output and Gnd of > the Beagle and use the GPIO pins to command the logic inputs. My problem is > that I don't know if I can plug the 74LS02 without components such as > resistors, in order to limit the current flowing through components. I don't > want to damage the board. > > The result of all the logic operations should be gathered by some GPIO pins > configured as inputs. > > Is it possible to proceed that way ? > > Thanks in advance for your answers > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- Rick Mann [email protected] -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
