This section provides an overview for network arrays as well as their applications and principles. Also, please take a look at the list of 8 network array manufacturers and their company rankings.
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A network array is a group of resistors, sometimes called a network resistor.
It consists of multiple resistor devices in the same package. All resistor devices in the same package are manufactured to have the same resistance value.
Each resistor has one terminal connected to the device, and the other is a common terminal for all terminals in the package, and there are types that are mounted in the same location on the circuit. This is sometimes called a bus-type resistor network array.
There is also a type in which multiple independent resistors of the same resistance value are placed in the same package. This is called a stand-alone network array.
In addition, since the network array is placed very close to each other in the same package, the surrounding environmental conditions are almost the same, so identical resistance characteristics can be expected.
Bus-type resistor network arrays are often used as pull-up and pull-down resistors on address buses and data buses, such as between CPU and memory.
Therefore, there are 4-element + common terminal 5-terminal types, and 8-element + common terminal 9-terminal types, of network array.
Network arrays are used around CPUs because many buses run between CPUs and memory, making it very difficult to secure mounting space.
Network arrays are available in SiP (Single in line) and DiP (Dual in line) packages.
The address bus and data bus between the CPU and memory, where bus-type network arrays are used, are described below. In some cases, data is written to memory from the CPU by addressing it, and in other cases, data is read from memory by addressing it.
Therefore, address and data I/O circuits on both the CPU side and the memory side are provided for the number of bits corresponding to the address length and data length. These I/O circuits are open-drain outputs because the direction of data changes dynamically.
For these reasons, unless a pull-up or pull-down process is performed to fix the potential, an undefined state is created, so network arrays are used to fix the potential on the power or ground side.
Since they are housed in the same package, they are used under relatively identical environmental conditions, and as a result, bus-type network arrays are suitable for bus connections between CPUs and memories, since they are expected to have almost identical characteristics.
*Including some distributors, etc.
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