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Logic - Shift Registers

74HC597D,652 are logic-shift registers from Texas instruments used in the embedded systems domain such as printers, data acquisition, network communication and other applications that require serial data. It is a octal transmission register and is one of the commonly used logic-shift registers used in many applications.

The 74HC597D,652 contains two independent 8-bit registers that can be used as serial-to-parallel or parallel-to-series shift registers, so they can be controlled by three-state logic conditions and compatible with logic voltages of 5-V. The serial and parallel data is provided in the same form, but the registers can be operated independently or consecutively.

Application field

The 74HC597D,652 is mainly used to convert digital information from parallel to serial and vice versain embedded applications. Traditional embedded systems employ serial buses for communication between parts of the same device or between multiple devices connected together.

The 74HC597D,652 logic-shift registers are ideal for converting parallel information into serial formats, such as I2C, UART, SPI, etc, that become the standard for most communication systems.

In addition, new applications for the 74HC597D,652 are found in touch screen control and electronic signage, LED lighting control and electronic instrumentation, as well as in automotive and home automation systems.

Working principle

The 74HC597D,652, logic-shift register, works on the basis of the shift registers, i.e., a set of stages linked together with data flow from stage to stage under control of shift clock pulses. The logic-shift register provides more than one operational mode, including serial-to-parallel, parallel-to-serial, and reload modes.

The operations for shifting data within the registers are initiated, whether in the serial or the parallel mode, by the rising or falling edges of the shift clock. Data is shifted in the direction of the shift register, either left or right, when clocked by the shift clock.

In the parallel mode, the register inputs (D0-D7) are all enabled at the same time and data is transferred at once. In the serial mode, the first data bit is presented to an input, typically denoted as the ‘Data In’ terminal, and, when the external clock pulses, data is shifted serially through the register stages.

The data is shifted into the register until the desired number of bits have been loaded. After that, all the data bits are available in parallel. The 74HC597D,652 further provides a provision to enable each of the 3-state outputs, permits the inputs to be latched, and is used to store the data.

The data can be shifted in serial-to-parallel mode or parallel-to-serial mode. Serial-to-parallel is used when the data is sent from an external device, such as an on-board serial peripheral device. In parallel-to-serial mode, the data is clocked out of the parallel outputs to form a serial data stream.

The 74HC597D,652 is well-suited to the embedded applications, where data is sent and received via serial interfaces. The shift registers are available in various packages, ranging from 8-pin PDIPs to 44-pin TSSOPs. The current consumption is typically in the order of few milliamps.

Conclusion

The 74HC597D,652 logic-shift registers are ideal for converting parallel information into serial formats. It supports multiple data shifting modes and is suitable for applications related to data acquisition, network communication and other applications that require serial data processing. Its low power operation and extremely small form factor make it an attractive choice for embedded systems applications.

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