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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Where should I connect the LED on pin 2 of ? You need to repeat it six times to check all gates. 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 correct operation.

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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 744hc08 state when not connected – they must be connected to the positive supply for a High, and to ground for a Low.

Now remove the wire and connect pin1 to GND this time.

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Sign up 74hhc08 Facebook. It’s just logic High and Low. Peter Bennett 36k 1 28 By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy 74hd08 and cookie policyand that your continued use of the website is subject to these policies. Home Questions Tags Users Unanswered.

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Negative to the GND via a resistor. I have the above IC and I want to check them before using them. The 74HC parts can use a power supply between 2 volts and 6 volts.

But keep the switch and LED connections as they are. What can I do to test them? It is important to give the correct part numbers!

You are halfway through. Positive of LED to pin 2. Whiskeyjack 3, 2 16 Get the pinout correct. 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.

74HC08 Datasheet

This verifies a working gate. Those parts are CMOS, so my last paragraph applies. TTL inputs are best driven by pulling them down or letting them be pulled up with a 74hx08 name, here pullup resistor. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Sign up using Email and Password. Here is the pinout diagram:. Connect an LED to pin 1 and pin 2 each along with current limiting resistors. If this gives you too much trouble mentally, use unused inverters to switch the input and output polarities.

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Write the truth table, get the pinout and follow the same pattern. Negative to resistor, resistor to GND. Circuit to test ICs at home? 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.

Here is the pinout diagram: Now take a wire and connect pin1 to VCC. The inputs of bipolar TTL parts will usually appear as logic High 1 when not connected.

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?

You must connect the inputs directly to ground to have them seen as a Low 0.

Here are circuits to use with, for instance, the and