SN75112N

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The SN75112N is a bus transceiver designed and manufactured by Texas Instruments. It is a member of the SN75xxN family and is designed to be used in applications requiring up to 64-bit parallel data communication over serial links that include buses and fiber optic channels. The SN75112N can operate as either a transmitter or receiver in these applications, making it versatile and easy to use. In this article, we will discuss the application field and working principle of the SN75112N.

Application Field of SN75112N

The SN75112N transceiver is designed for applications in a wide range of markets, from consumer electronics to automotive and industrial. It can be used for serial communications in the following types of applications:

• RS-232: The SN75112N can be used to provide multi-drop and point to point communication using RS-232.
• RS-485: The SN75112N can be used in systems requiring longer distances and larger nodes.
• Ethernet: The SN75112N can be used in Ethernet applications requiring the full-duplex transmission of data over twisted pair cable.
• Fibre Channel: The SN75112N can be used in Fibre Channel applications, providing the transmission of data over both copper and optical media.

The SN75112N is also suited for use in applications involving other types of serial communication, including CANbus, CANopen, Mil-STD-1553, NMEA 0183, and other proprietary protocols.

Working Principle of SN75112N

The SN75112N transceiver is a bus transceiver designed for applications requiring the transmission or reception of serial data. It operates as both a transmitter and a receiver, with a maximum data rate of 1 Mbps. The SN75112N contains four primary components: a transmitter, a receiver, a transmitter/receiver (T/R) control logic and a differential line driver/receiver (DLD/R).

The transmitter carries out the function of converting the input parallel data into serial data. The data is then sent via the differential line driver acro ss the output pair pins (A1 and A2). The receiver receives the serial data and restores it to its original parallel form through the differential line receiver.

The transmitter and receiver are T/R controlled separately by the respective pins, enabling the SN75112N to function as both a transmitter and a receiver. The T/R pin is used for both the transmitter and the receiver to control their operation. When the T/R pin is low, the transmitter is enabled and the receiver is disabled. When the T/R pin is high, the receiver is enabled and the transmitter is disabled.

The SN75112N also includes a differential line driver/receiver (DLD/R) which is used for the transmission and reception of serial data. The DLD/R consists of two line drivers (LDs) and two line receivers (LRs). The LDs are used to drive the output data when the transceiver is operating in the transmit mode, and the LRs are used to receive the data when the transceiver is operating in the receive mode.

The SN75112N also includes a protection circuit which prevents the transmission or reception of invalid or dangerous data. This circuit includes error detection and protection logic which can detect any fault conditions and will disable the transmitter/receiver operation, ensuring the safety and reliability of the system.

Conclusion

The SN75112N bus transceiver is designed to provide up to 64-bit parallel data communication over serial links that include buses and fiber optic channels. It is suited for a wide range of applications including RS-232, RS-485, Ethernet, Fibre Channel, and other serial communications such as CANbus, CANopen, Mil-STD-1553, and NMEA 0183. The SN75112N is T/R controlled and includes a differential line driver/receiver and protection circuit, making it safe and reliable for use in a variety of applications.

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