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74189 RAM PDF

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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digital logic – TTL tri-state 16×4 RAM chip not working – Electrical Engineering Stack Exchange

Here’s the datasheet and the store page: The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. Notice also that the identical post has occurred on multiple forums.

The wires I had bought were faulty. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read 741189 updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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Where are the pullup resistors for your switches? Papabravo Well-Known Member Oct 10, Media New media New comments Search media.

74LS189 IC – 64-Bit RAM with 3-State Output IC (74189 IC)

Email Required, but never shown. What actually happened is that they were renamed. Notice once again that the original poster seldom returns.

Yes I know the LEDs are inverted but the chips sense outputs are inverted too. Datasheets, Manuals or Parts. Replacement Transformer Started by ncag Today at 7: Home Questions Tags Users Unanswered. Pioneer Elite vsxtx water damage no power Started by Watin 43 minutes ago Replies: Hero Banned Aug 29, Depending on how it was stored over the past 40 years, the chip you have may simply have expired from old age.

You need pullup resistors.

electronic enthusiasts out there!!! internal circuirtry of 74LS189-64-bit RAM

For a better experience, please enable JavaScript in your browser before proceeding. Here is what I imagine. Papabravo Well-Known Member Oct 2, Welcome to our site! Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Click here to register now. They were only made in the s. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. Just look at the date of the OP Sign up using Facebook.

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Are these guys all members of the same class, or worse, team in a class? I thought pullup resistors were only necessary for CMOS. 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.

Note that the value given is positive 40 uAwhich means that rwm external circuit must source current in order to drive the input high — i. Look at the datasheet again. You must log in or register to reply here. A value like 10K on each rqm should work well.

If you’re after some memory pull some cache chips from an old Yes I know the LEDs are inverted but the chips sense outputs are inverted too Here’s the datasheet and the store page: Thread starter earlbesario Start date Oct 2,

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