SN75C3221PW

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Introduction

The SN75C3221PW is an integrated circuit (IC) manufactured by Texas Instruments, intended for use in data communications applications. It is a universal asynchronous receiver / transmitter (UART) integrated circuit device that provides full-duplex asynchronous serial data communication between two systems. This versatile device supports a variety of communication components, including RS-232, TTL/CMOS, and TTL compatible logic levels. It provides excellent flexibility for data communication rate configurations from 110 bps to 115.2 Kbps with only one crystal or clock source.

Applications

The SN75C3221PW is widely used in a variety of applications where asynchronous serial communication is required, such as in embedded systems, medical equipment, data acquisition systems, industrial automation and control systems, as well as equipment for telecommunications, electronic funds transfer, and many other types of applications.

The combination of the low-power design and excellent performance of the SN75C3221PW makes it attractive for applications where line discipline and data clock synchronization are key considerations, such as in data acquisition systems. The integrated UART is also suitable for applications in computer mainframes, servers, and many other types of systems that require a low-cost, low-power UART solution.

Features

The SN75C3221PW provides a range of adjustable baud rates, depending on configuration. It provides 8-bit, 16-bit and 32-bit data frames with odd, even, no parity or other parity options. The device also supports 1, 1.5 and 2 stop bits. It is also configurable for LSB or MSB first data bit transmission.

The device also offers advanced features such as Auto Flow Control (AFC) and Data Terminal Ready (DTR) control. AFC is a method that monitors the transmission on-the-fly, making sure that data flow is consistent. DTR control allows the device to detect if the remote equipment is sending data, allowing the processor to detect when data is ready to be sent.

The SN75C3221PW is also equipped with flow control signals, such as Clear to Send (CTS) and Request to Send (RTS). This feature allows the rate of data transmission to be regulated, helping to ensure data accuracy between devices. The device also includes a data clock source and integrated receiver / transmitter which supports a wide range of data clock speeds.

Working Principle

The SN75C3221PW is a versatile universal asynchronous receiver / transmitter that supports 8-bit, 16-bit, and 32-bit data frames. It also supports asynchronous communication based on baud rates varying from 110 to 115.2 Kbps. The device requires only one crystal or clock source to provide setup and receive data. This clock source is connected to the device through the Data Clock input pin.

On the transmitter side, the device allows data to be sent using one of the framing formats supported, such as 1, 1.5, or 2 stop bits, and odd, even, or no parity etc. The data is encoded in the UART main shift register which is controlled by the Data Clock provided by the clock source.

On the receiver side, the device allows incoming data to be received through the serial interface and decoded into the corresponding frame type. To ensure reliable data transfer and prevent frame collisions, the device also supports flow control signals such as Clear to Send (CTS) and Request to Send (RTS).

Conclusion

The SN75C3221PW is a universal asynchronous receiver / transmitter (UART) IC provides a reliable and high-performance solution for various data communication applications where full-duplex asynchronous serial communication is required. The device supports a wide range of baud rates, framings, and supported data types to allow optimal data transfer between two systems. Furthermore, the device also supports advanced features such as auto flow control and data terminal ready control, allowing for reliable and timely data transfer between devices.

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