IMQ82C55AZ

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An Intel IMQ82C55AZ is an I/O expansion chip designed to expand the number of I/O pins on an existing system bus or motherboard. It is an 8-bit chip designed to be used with an Intel 8255-based I/O expansion bus. It provides up to 32 I/O ports with three 8-bit ports and one 8-bit port. The three 8-bit ports can be used as independent ports or they can be grouped together to form two 16-bit ports. The 8-bit port can be configured as either a single port or two 4-bit ports.

From a functional standpoint, the IMQ82C55AZ is generally used to extend the number of I/O ports available on a system, enabling peripheral devices to be connected to the system without the need for additional components. It is also used as a buffer for digital communication, allowing devices to communicate even when the system is under heavy load. The IMQ82C55AZ is capable of providing up to 4MHz operation at 3.3V and can operate in either an active-high or active-low mode.

From a hardware perspective, the IMQ82C55AZ is similar to other I/O expansion chips in that it requires an Intel 8255-based I/O expansion bus. It comes in a 32-pin package and usually requires only two power supplies, 5V and 3.3V dc. In addition, it features a watchdog timer, interrupt and reset control, and address/data bus buffering.

Regarding the working principle of the IMQ82C55AZ, it is designed to operate as a slave device connected to an Intel 8255-based I/O expansion bus. Once connected, the IMQ82C55AZ polls the data bus, retrieving and processing commands sent from the master device. It then sends the data to its internal I/O ports, where it can be read by attached devices. When the IMQ82C55AZ receives a write command, it immediately stores the data and sends a signal back to the master device, indicating that the data has been successfully read. Since the IMQ82C55AZ is a slave device, all communication with it is initiated by the master device.

The IMQ82C55AZ is primarily used in the development of consumer and industrial applications, including robotic systems, intelligent lighting systems, access control systems, and home appliances. It can also be used in medical and commercial applications. As an adapter, it can be used to interface with a variety of different peripheral devices, such as analog-to-digital converters, solenoids, LEDs, and temperature/humidity sensors.

Overall, the IMQ82C55AZ is a popular and powerful I/O expansion chip designed to extend the number of I/O ports in a system or motherboard. Offering high integration and low power consumption, it is useful in a variety of applications in both consumer and industrial sectors. The IMQ82C55AZ can be used as a reliable and cost-effective solution for extending the functionality of system level designs.

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