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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Look at the datasheet again.
Click here to register now. Home Questions Tags Users Unanswered. Papabravo Well-Known Member Oct 10, Depending on how it was stored over the past 40 years, the chip you have may simply have tam from old age.
I’m usually pretty good at spotting such “revivals”, but this one escaped. They were only made in the s. Where are the pullup resistors for your switches?
But you’re likely to never get a response with large bold messages. Sign up or log in Sign up using Google. Are these guys all members of the same class, or worse, team in a class?
74LS189 IC – 64-Bit RAM with 3-State Output IC (74189 IC)
To participate you need to register. Of course you 741899 it ASAP. It’s not clear from the original post that the goal is to use a 74LS in a circuit. Sign up using Facebook.
TTL-series SRAM demonstration
Note eam this is a very old chip. Yes I know the LEDs are inverted but the chips sense outputs are inverted too. Welcome to our site! Fam actually happened is that they were renamed.
Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Thread starter earlbesario Start date Oct 2, Forums New posts Search forums. It’s neither elegant, nor efficient but it does perform the function.
(PDF) 74189 Datasheet download
Papabravo Well-Known Member Oct 2, You need pullup resistors. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. Notice also that the identical post has occurred on multiple forums.
You must log in or register to reply here. The wires I had raj were faulty. Just look at the date of the OP 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. Post as a guest Name. Hero Banned Aug 29, I thought pullup resistors were only necessary for CMOS.
Here’s the datasheet and the rak page: