ICL3222CB

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ICL3222CB is an integrated CMOS circuit designed to meet the EIA/TIA-232-F specification. It is an advanced low power single chip solution for interfacing terminal devices to asynchronous serial data buses. It functions as a dual differential line driver and receiver with programmable slew rate control for RS-232 and V.25 applications. In this article, we will discuss some major applications of the ICL3222CB as well as its working principle.

Application Fields

The ICL3222CB can be used in a variety of applications. It is an ideal device for implementing communication interface in computer systems such as personal computers, laptop computers, peripherals, terminals, modems and portable computers. Specifically, the ICL3222CB is used for:

• Data Communications - for serial data communication, such as modems, terminal devices, peripheral devices, etc.
• Control Applications - for motor, lighting and other devices that require RS-232 control
• Secure Communications - for secure communications where RS-232 is used as the data interface.
• Machine Interface - for machine interface devices, such as bar code readers, bar code printers, etc.
• Medical Equipment - for medical equipment, such as heart monitors, respirators, etc.
• Portable Devices - for portable devices, such as mobile phones, PDAs, etc.

Working Principle

The ICL3222CB is essentially a dual-channel, differential line driver and receiver with programmable slew rate control. To physically connect the device to other RS-232 communications components, the input, output and control signals must be connected to the appropriate pins using appropriate cables and/or connectors. This can be done by connecting the signals to the positive and negative inputs (TXA and TXB) of the ICL3222CB, and then to the other devices. Inputs from the other devices can be connected to the ICL3222CB’s differential input receiver pair (RXA and RXB).

Most communication between devices utilizing ICL3222CB is possible by use of an SIO/DMA controller, which allows for the synchronization of components by controlling the exchange of data. The SIO/DMA controller also allows for data to be stored in and retrieved from memory. This can be done by controlling the ICL3222CB’s handshaking signals, RTS, CTS, DSR and DCD, between the controller and the other connected devices. With these handshaking signals, data can be bidirectionally transferred between devices.

Additionally, the ICL3222CB also supports power saving software that can program the drivern receiver to enter a low power mode, when idle, to conserve energy. The ICL3222CB also offers programmable slew rate control, allowing the end user to configure the line drivers to operate at a desired slew rate. This allows for improved signal integrity, and helps eliminate EMI (electromagnetic interference).

The ICL3222CB is an excellent choice for interfacing terminal devices to asynchronous serial data buses. It features low power consumption, programmable slew rate control and handshaking signals, making it an ideal choice for a variety of applications.

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