74HC08 PDF

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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You are halfway through. Here is the pinout diagram:. Write the truth table, get the pinout and follow the same pattern.

Here are circuits to use with, for instance, the and And TTL outputs are much better at sinking current rather than sourcing it, so don’t try to drive an LED output to ground.

Then shouldn’t the diagram I drew above work? Similarly, you 74hc088 think about all other ICs. Sign up or log in Sign up using Google.

74HC08 Datasheet

Sign up using Facebook. The inputs of bipolar TTL parts will usually appear as logic High 1 when not connected.

What can I do to test them? Post as a guest Name. This verifies a working gate.

74HC08 AND Gate Example Circuit | Sully Station Technologies

74hhc08 Questions Tags Users Unanswered. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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If your parts are really74hc80 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 correct operation.

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 74hv08 on pin 2 will be Low, so the LED won’t light. Sign up using Email and Password. It is important to give the correct part numbers! Those parts are CMOS, so my last paragraph applies.

Positive of LED to pin 2. I have the above IC and I want to check them before using them.

Negative to the GND via a resistor. Circuit to test ICs at home? Now take a wire and connect pin1 to VCC. Whiskeyjack 3, 2 16 Now remove the wire and connect pin1 to GND this time. Negative to resistor, resistor to GND.

It’s just logic High and Low. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

You can proceed like this for Connect an LED to pin 1 and pin 2 each along with current limiting resistors. Get the pinout correct.

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You need to repeat it six times to check all gates. TTL inputs are best driven by pulling them down or letting them be pulled up with a obvious name, here pullup resistor.

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74gc08 But keep the switch and LED connections as they are. Peter Bennett 36k 1 28 Seems like you got an arduino. You must connect the inputs directly to ground to have them seen as a Low 0.

If this gives you too 47hc08 trouble mentally, use unused inverters to switch the input and output polarities. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

If the parts have 7hc08 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 be connected to the positive supply for a High, and to ground for a Low. Here is the pinout diagram: The 74HC parts can use a power supply between 2 volts and 6 volts.

Where should I connect the LED on pin 2 of ?