3 Description. The SNx4HC08 devices contain four independent. 2-input AND gates. They perform the Boolean function Y = A ○ B or Y = A + B in positive logic. 74HC08 Datasheet, 74HC08 Quad 2-input AND Gate Datasheet, buy 74HC 74HC08D from NEXPERIA >> Specification: AND Gate, 74HC08, 2 Input, mA, 2 V to 6 V, SOIC
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If your parts are reallyand with no letters other than possibly L or LS in the middle, like 74LS04 they are bipolar TTL logic, and require a 5 volt power supply for 74gc08 operation. The 74HC parts can use a power supply between 2 volts and 6 volts.
Now remove the wire and connect pin1 to GND this time.
74HC08 AND Gate Example Circuit | Sully Station Technologies
Sign up using Email and Password. The inputs of bipolar TTL parts will usually appear as logic High 1 when not connected.
If this gives you too much trouble mentally, use unused inverters to switch the input and output polarities. Sign up using Facebook.
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Circuit to test ICs at home? Positive of LED to pin 2.
Those parts are CMOS, so my 74hd08 paragraph applies. Connect an LED to pin 1 and pin 2 each along with current limiting resistors. You do need a current-lilmiting resistor Ohms or so in series with the LED, but with pin 1 tied to Vcc, the output of the inverter on pin 2 will be Low, so the LED won’t light. Here are circuits to use with, for instance, the and Peter Bennett 36k 1 28 Get the pinout correct. But keep the switch and LED connections as they are.
Negative to the GND via a resistor. Here is the pinout diagram:. Write the truth table, get the pinout and follow the same pattern. If the parts have a C in the middle 74C04 or 74HC04they are CMOS, and the inputs are very high impedance, and will be in an unknown state when not connected – they must 74hc0 connected to the positive supply for a High, and to ground for a Low.
You are halfway through. 74h0c8 Questions Tags Users Unanswered. Then shouldn’t the diagram I drew above work? It 74hf08 important to give the correct part numbers! It’s just logic High and Low. Where should I connect the LED on pin 2 of ?
Now take a wire and connect pin1 to VCC. You can proceed like this for This verifies a working gate. TTL inputs are best driven by pulling them down or letting them be pulled up with a obvious name, here pullup resistor.
Seems like you got an arduino.