DS21455N

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DS21455N is a high-performance CMOS 5V Programmable Output Interface IC that allows computer interfaces to control telephone line interfacing and equipment. It is mainly used for telephone handset line switching, voice or data communication interface, detecting, transcoding, and call progress monitoring. It can be used with PC interface logic ICs to provide complete computer control of telephone applications.

DS21455N Application Field

DS21455N is mainly applied in voice, data, and control applications. It is mainly used in the following two areas:

• Telephone line switching, detection and transcoding applications
• Voice or data communication interface applications

DS21455N is mainly used in telephone line switching and detection applications to switch the telephone line to various line terminating equipment, such as telephone handsets, modems, computers, etc. It supports DTMF detection and transcode, which can detect and decode up to sixteen standard telephone dual tone multifrequency (DTMF) numbers.

DS21455N is mainly used in the voice or data communication interface applications, which provides a direct connection to the analog phone line. It can provide the signal and control interface functions between the analog telephone line and the digital equipment. It can be used to connect the telephone line and the telephone exchange, as well as the connection to digital modems.

DS21455N Working Principle

DS21455N is a programmable interface IC that is able to interface with digital circuits, such as microprocessors, to control telephone line applications. It consists of three main blocks: the transmit/receive data registers, the control logic unit, and the line driver/receiver unit. The line driver/receiver unit controls the telephone interface and provides the line loop current and the off-hook voltage.

The T/R data registers store the programmed commands, which are the control and status signals that are used to control the operation of the IC. The T/R data registers are connected to the control logic unit, which provides the timing and logic control signals to the T/R data registers. The control logic unit also provides the necessary timing signals to the line driver/receiver unit.

The DS21455N supports a variety of line interfaces, including the On/Off Hook and Line Monitor features. The On/Off Hook feature allows the DS21455N to monitor the detach state of the telephone line. When the line is detached, the DS21455N can be used to turn the telephone line on, off, or engage the line monitor. The Line Monitor feature allows the DS21455N to monitor the line for any activity, such as ringing or a call.

Lastly, the DS21455N supports a variety of Line Protocols. It supports both dial pulse and DTMF dialing, which can detect up to sixteen DTMF tones. The DS21455N is also capable of providing Caller-ID, dial tone detection, and off-hook line detection.

Conclusion

In conclusion, DS21455N is a high-performance CMOS 5V Programmable Output Interface IC designed for the control of telephone line interfacing and equipment. It is mostly used in telephone line switching, detection and transcoding applications. It also supports voice or data communication interface applications, as well as a variety of line protocols and features. Its features include On/Off Hook, Line Monitor, Caller-ID, dial tone detection and off-hook line detection. By using the DS21455N, telephone line applications can be easily controlled and managed by digital circuits.

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