Post Jobs


The SGA is a high performance SiGe HBT. MMIC Amplifier. NOTE: The recommended operating current in the preliminary datasheet was mA. MOSFET are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for MOSFET. Datasheet, In Stock. SN datasheet, SN circuit, SN data sheet: TI – BIT RANDOM- ACCESS READ/WRITE MEMORY,alldatasheet, datasheet, Datasheet search site.

Author: Zulkisar Mazugis
Country: Armenia
Language: English (Spanish)
Genre: Sex
Published (Last): 28 January 2018
Pages: 460
PDF File Size: 16.13 Mb
ePub File Size: 3.79 Mb
ISBN: 867-9-42011-920-6
Downloads: 27850
Price: Free* [*Free Regsitration Required]
Uploader: Dojin

Sign up using Email and Password. This question has already fatasheet answered in some detail. You will have better chance of up-votes if you break up your wall of text into small paragraphs. What here determines the size?

ME high regardless of the! It is my first time using this.

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

Email Required, but never shown. 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. Ideally only D2 in the schematic would change because D1 is Hi, S1 is the only output that should go low in read mode! Whit3rd 4, 10 I assume that the memory enable should just stay low at all times, but I did try moving it around.

I got more and I have finally gotten everything to work. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The pdf sheet on this part specifies a load of mA as being a safe maximum load, as a current sink.


I am guessing that the s that I got are broken. I have attempted to draw a schematics of my setup for the below. Yeah I’m new to writing on this, having leeched much info in the past. Why are two LEDs on?

(PDF) 7489 Datasheet download

I still can’t get it to work, but I will accept your answer because you provide a general schematics for the chip. Schematics for using IC memory Ask Question. Any value of input pullup resistor greater than ohms will suit for LOW input normal function. Also, for the inputs address and data input I did choose 4. I have been learning about the memory chip.

Remember, both ME and WE need to be active low in order to write data to the chip. Then the switch is closed, then also LED D5 comes on. 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 in my blurb: Thanks for the answer.

This is a follow up question to this question.

I would hook the up as follows:. I bought two SN because I wanted to learn datasehet the memory chip works. The SIP network is nice because you can plug it into your breadboard right next to the DIP switch, eliminating a lot of wires.

Does this mean that I am doing something wrong, or have I broken the chip?

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. If I connect the ME to high, then this behavior does not change.

To comment, click on the “add a comment” link by the answer or question your commenting to. I just want to make sure that I understand before I do any damage. I had two of these that turned out to be broken see here datasheeet previous question on this. Sign up using Facebook. At ohms the current is Lower current gives less light, but for indicator light use I find tha 10 mA is more than enough, so I’d use Ohms or more. Home Questions Tags Users Unanswered.


7489 Datasheet

Since the outputs are open collector the output is an NPN transistor with the emitter grounded, and the collector connected only to the output pinyou should use a pull-up resistor of 4K7 or so when connected to a TTL input. WE low by closing the switch – it might be worth pulling 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: After playing around for some time with the IC, it got really hot and I am afraid that I ruined the chip.

As this is an old original bipolar TTL pert, it may get warm in operation, but if it is HOT you don’t want to touch it for longsomething is wrong.

Post as a guest Name. ME alone is lo and! Do I need some resistors somewhere in all of this? I don’t know a bunch and I am just trying to 7849. For LED drive, you do the same thing: Switch resistance of 0. Thanks for cleaning up the schematics.