SN75158DR

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The SN75158DR is a quad low-power high-speed CMOS line receiver designed to meet the specifications of .0625-Mbps current loop systems. The device is designed to work with the ubiquitous SN75159DR dual current loop driver to form an easy-to-use interface for various applications. This article discusses the application field and working principle of the SN75158DR.

Application Field

The SN75158DR is a versatile device that can be used in almost any application where current loop signaling is required. It is often used in applications that demand fast interconnects such as communication systems, signal monitoring and control systems, data acquisition units, and remote data acquisition applications. It is also used in PC or PC/AT or PC/XT buses, where the signal is transmitted over a current loop. Furthermore, the SN75158DR is used for asynchronous communication and for inter-computer communication over short distances.

Working Principle

The SN75158DR is a 4-state line receiver that operates on an .0625-Mbps current loop signal from the SN75159DR driver. It senses input signals on RS0-RS3 pins without degrading data rate or reliability. Each receiver consists of two Schottky-clamped NAND gates, one amplifier stage, one buffer stage, and one voltage comparator stage.

The SN75158DR\'s four NAND gates offer two-state operation, while the buffer and comparator stages work together to provide four-state operation. By connecting the output of the first two NAND gates to the input of the buffer stage and to the table of the comparator, the logic level of the buffer\'s output can be changed by applying a voltage to the comparator\'s reference terminal, irrespective of the logic level at the inputs of the buffer.

This allows for full, four-state operation by offering high input impedance and low output impedance. Output is provided in both active-high and active-low states. Thus, the SN75158DR can receive signals from the SN75159DR and output them in either a high or low state. The device also has an open-collector output connection for diagnostic debugging. The device is typically operated in a single-ended current loop topology, but it can also be operated in a differential current loop topology.

In summary, the SN75158DR is a versatile quad low-power high-speed CMOS line receiver designed to meet the specifications of .0625-Mbps current loop systems. It can be used in a variety of applications where current loop signaling is required, and its four-state operation allows for fast interconnects in communications systems and signal monitoring and control systems.

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