Part Number, Number of Items, 2. Brand Name, MAJOR BRANDS. Item Weight, Material, Aluminum. UNSPSC Code, IC RAM IC type is a 16 * 4 RAM. The internal logic is similar to the circuit shown in Fig. for a 4 * 4 RAM. The pin assignments to the inputs and outputs . The random access memory (RAM) stores the program the computer is executing 74LS 4-bit D register · bit RAM · 74LS 8-bit bus transceiver.
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7489 participate you need to register. Where are the pullup resistors for your switches? A value like 10K on each switch should work well. Notice also that the identical post has occurred on multiple forums. Here is what I imagine. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. What actually happened is that they were renamed.
RAM 16 x 4 con salida de 3 estados | xcs32h | Flickr
Look at the datasheet again.
Click here to register now. Note that the value given is positive 40 uAwhich means that the external circuit must source current in order to drive the input high — i. Replacement Transformer Started by ncag Today at 7: The only databook I have that has anything on it dates fromand by rxm, it was no longer listed in any of them.
74LS189 IC – 64-Bit RAM with 3-State Output IC (74189 IC)
Welcome to our site! If you’re after some memory pull some cache chips from an old I thought pullup resistors were only necessary for CMOS. The wires I had bought were faulty. Pioneer Elite vsxtx water damage no power Started by Watin 43 minutes ago Replies: Forums New posts Search forums.
TTL-series SRAM demonstration
Sign up using Email and Password. Thread starter earlbesario Start date Oct 2, Datasheets, Manuals or Parts. They were only made in the s. They’re SRAM, 32KB each, and while you’d never need it all you can easily only use the first 3 address bits data is accessed 8 bits at a time and ignore the rest.
Note that this is a very old chip. The issue was the equipment I was using. Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations.
Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Just look at the date of the OP You must log in or register to reply here. Ra, my 40 plus years in the business I don’t think I’ve ever seen that despite using the part on numerous occasions.
Post as a guest Name. But you’re likely to never get a response with large bold messages.
electronic enthusiasts out there!!! internal circuirtry of 74LS189-64-bit RAM
I’m usually pretty good at spotting such “revivals”, but this one escaped. It’s neither elegant, nor efficient but it does perform the function.
Sign up using Facebook. You need pullup resistors. Papabravo Well-Known Member Oct 2, Are these guys all members of the same class, or worse, team in a class?
Sign up or log in Sign up using Google. Papabravo Well-Known Member Oct 10, Home Questions Tags Users Unanswered. Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: Yes I know the LEDs are inverted but the chips sense outputs are inverted too.
Depending on how it was stored over the past 40 years, the chip you have may simply have expired from old age.