Hi, I just wanted to ask about what 5V power supply rating I should use and whether it would be safe to run at such high currents on my breadboard.
The majority of the chips are 74HC series and have maximum operating currents of 80 microAmps. Yet I also have a bunch of 74LS chips. All of my quad tri-state buffers are 74LS126 chips and I might have 8 to 10 of them, then I have 20 74LS191 chips making up the binary counters. The problem is that according to the data sheet, these 74LS chips draw between 12, 22 to 35 milliAmps or current. Now this is a lot as .012 Amps * 10 would be .12 Amps then .035 Amps * 20 would be 0.7. Then there are 100 other 74HC chips drawing 80 microAmps each, giving me 0.008 Amps. So I would be maxing out at around 1 Amp.
Huh, it would be funny if originally I treated the power dissipation as current instead of mW giving me 1.8 A which made me afraid that I would need a 10A rated power supply or that the breadboards would overheat. But anyways, with 1 to 2 Amps running through the power rails of 21 breadboards, would the breadboards and my precious integrated circuits still be safe under the case that I have a 2 Amp 5V power supply that can handle it?
The majority of the chips are 74HC series and have maximum operating currents of 80 microAmps. Yet I also have a bunch of 74LS chips. All of my quad tri-state buffers are 74LS126 chips and I might have 8 to 10 of them, then I have 20 74LS191 chips making up the binary counters. The problem is that according to the data sheet, these 74LS chips draw between 12, 22 to 35 milliAmps or current. Now this is a lot as .012 Amps * 10 would be .12 Amps then .035 Amps * 20 would be 0.7. Then there are 100 other 74HC chips drawing 80 microAmps each, giving me 0.008 Amps. So I would be maxing out at around 1 Amp.
Huh, it would be funny if originally I treated the power dissipation as current instead of mW giving me 1.8 A which made me afraid that I would need a 10A rated power supply or that the breadboards would overheat. But anyways, with 1 to 2 Amps running through the power rails of 21 breadboards, would the breadboards and my precious integrated circuits still be safe under the case that I have a 2 Amp 5V power supply that can handle it?