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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. This is a follow up question to this question. I have attempted to draw a schematics of my setup for the below.

Without the switch closed, the LED D1 is on. Then the switch is closed, then also LED D5 comes on. If I connect the ME to high, then this behavior does not change. Also, if say D2 is brought high with the other inputs low, then all the LEDs are off. R4 should be ON. Your only using address ‘0’ A0 – A3 are lowso toggling datasheef ME pin has no effect.

The pdf sheet on this part specifies a load of mA as being a safe maximum load, as a current sink. At ohm’s the LED current is only 6mA. If the IC’s output is irrational then it datasheeet oscillating or it is blown. You have all of the address pins constantly held low giving the addressyou have all of the data bits held low except for bit 1 giving a nibble or word in the datashest of WE to replace the overscore notatation used for active low in the datasheet – you datashheet ME always low, and hopefully can toggle!


WE low by closing the switch – it might be worth datashee this high with a resistor when you’re not trying to write, but that might be irrelevant – at the moment you’ve got two possible control states: We Lo, the truth table on the data sheet says that if both are low the state when you have the switch closedall data outputs will be Hi.

ME alone is lo and! ME high should leave outputs high. Ideally only D2 in the schematic would change because D1 is Hi, S1 is the only output that should go low in read mode! Datasgeet Hiif you’re in write mode both controls! WE lo then all outputs should be high, as they should be if you take! ME high regardless of the! WE state – and if they’re high they shouldn’t be able to light the LEDs.

By clicking “Post Your Answer”, you acknowledge that you datasyeet read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

(PDF) 7489 Datasheet download

Home Questions Tags Users Unanswered. Why are two LEDs on? Does this mean that I am doing something wrong, or have I broken the chip? I have also datashete inserting pull up resistors 1kOhm to 4.

schematics – Why are two LEDs on? is broken? – Electrical Engineering Stack Exchange

Thanks for cleaning up the schematics. It is my first time using this. The IC is blown then. You could try using a ground strap thin copper braid around your wrist and ground to the IC’s ground to avoid static damage.

7489 Datasheet

Just for the record, I used a in quite successfully. Yeah I know It’s irrelevant but what the hell!

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Can you remember how you wired it up? Sparky 11k 2 15 Thanks for the answer. That is what I was thinking. The outputs are inverted OC type. At present only D2 should be on.

I need to check the sink current for this IC. It may not be able to drive LED’s directly. Maybe I should add that if, say, D2 is brought high with the other inputs low, then all the LEDs are off. You will have better chance of up-votes if you break up your wall of text into small paragraphs.

(PDF) Datasheet PDF Download – 64 Bit RAM

In fact it would have been cut short with a “Too many characters” warning. To comment, click on the “add a comment” link by the answer or question your commenting to. Use the ‘ ‘ symbol to find names in a long list of comments so that person gets the comment sent to them. Yeah I’m new to writing on this, having leeched much info in the daatsheet. I got carried away that I might be able to help – so carried away that I didn’t see you’d put in a more succinct answer before I sent fatasheet my blurb: Sign up or log in 789 up using Google.

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