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The number of elements per chip in an IC is called the component density. There has been a steady increase in the number of components that can be fabricated on a single chip. There is an absolute limit on component density, imposed by the atomic structure of the semiconductor material literally, the size of the atoms! Technology has begun to approach that barrier.
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Small Scale In small scale integration (SSI), there are fewer than 10 transistors on a chip. These types of ICs can carry the largest currents, and can be useful in voltage regulation and other moderate-power applications. Medium Scale In medium scale integration (MSI), there are 10 to 100 transistors per chip. This allows for considerable miniaturization, but it is not a high level of component density, relatively speaking. An advantage of MSI (in a few applications) is that fairly large currents can be carried by the individual gates. Both bipolar and MOS technologies can be adapted to MSI. Large Scale In large scale integration (LSI), there are 100 to 1000 transistors per semiconductor chip. This is an order of magnitude (a factor of 10 times) more dense than MSI. Electronic wristwatches, single-chip calculators, and simple microcomputers are examples of devices using LSI ICs. Very-Large-Scale Devices Very-large-scale integration (VLSI) devices have from 1000 to 1,000,000 transistors per chip. This can be up to three orders of magnitude more dense than LSI. Microcomputers and memory ICs are made using VLSI. Ultra-Large-Scale Devices You might sometimes hear of ultra-large-scale integration (ULSI). Devices of this kind have more than 1,000,000 transistors per chip. The principal uses for this technology are in the fields of highlevel computing, supercomputing, robotics, and artificial intelligence (AI).
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Binary digital data, in the form of high and low levels (logic ones and zeros), can be stored in memory ICs. These devices can take various physical forms.
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Random Access A random access memory (RAM) chip stores binary data in arrays. The data can be addressed (selected) from anywhere in the matrix. Data is easily changed and stored back in RAM, in whole or in part. A RAM chip is sometimes called a read/write memory. An example of the use of RAM is a word-processing computer file that you are actively working on. This paragraph, this chapter, and in fact the whole text of this book was written in semiconductor RAM in small sections before being incrementally stored on the computer hard drive, and ultimately on external media. There are two major categories of RAM: dynamic RAM (DRAM) and static RAM (SRAM). A DRAM chip contains transistors and capacitors, and data is stored as charges on the capacitors. The charge must be replenished frequently, or it will be lost through discharge. Replenishing is done automatically several hundred times per second. An SRAM chip uses a flip-flop to store the data. This gets rid of the need for constant replenishing of charge, but the tradeoff is that SRAM ICs require more elements than DRAM chips to store a given amount of data. With any RAM chip, the data in it will vanish when power is removed, unless some provision is made for memory backup. The most common means of memory backup is the use of a small cell or battery with a long shelf life. Modern IC memories need so little current to store their data that a backup battery lasts as long in the circuit as it would on the shelf. Memory that disappears when power is removed is called volatile memory. If memory is retained when power is removed, it is nonvolatile. Read Only By contrast to RAM chips, the data in a read-only memory (ROM) chip can be easily accessed, in whole or in part, but not easily written over. A standard ROM chip is programmed at the factory. This permanent programming is known as firmware. But there are also ROM chips that you can program and reprogram yourself. The data contents of ROM chips are generally nonvolatile. That means a power failure is no cause for concern. An erasable programmable ROM (EPROM) chip is an IC whose memory is of the read-only type, but that can be reprogrammed by a certain procedure. It is more difficult to rewrite data in an EPROM than in a RAM; the usual process for erasure involves exposure to ultraviolet (UV). An EPROM IC can be recognized by the presence of a transparent window with a removable cover, through which the UV is focused to erase the data. The IC must be taken from the circuit in which it is used, exposed to UV for several minutes, and then reprogrammed. The data in some EPROM chips can be erased by electrical means. Such an IC is called an electrically erasable programmable read-only memory (EEPROM) chip. These do not have to be removed from the circuit for reprogramming.
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