LT1785CS8

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LT1785CS8

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RS-422/RS-485 Interface IC LT1785 - 60V Fault Protected RS485/RS422 Transceivers

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Specifications

Attribute Value

Overview

Description

The LT1785CS8 is a high-speed RS-485/RS-422 transceiver designed by Linear Technology, now part of Analog Devices. It is characterized by its robust performance in data communication systems, offering up to a 250 kbps data rate. The device operates on a single 5V supply and is capable of driving up to 32 unit loads, allowing for up to 32 transceivers on a single bus.
One of its key features is its low power consumption, alongside thermal shutdown protection, which enhances its reliability. The LT1785CS8 provides a fail-safe feature that ensures a logic high on the receiver output when the bus is idle, open, or short-circuited. It also includes ESD protection to ±15kV (Human Body Model), which guards against electrostatic discharge damage.
The transceiver is suitable for long-distance data transmission in industrial environments due to its ability to handle high noise levels and maintain signal integrity. Its compact 8-pin SO package makes it ideal for space-constrained applications, ensuring ease of integration into various circuit designs.

Equivalent

The LT1785CS8 is a robust RS-485/RS-422 transceiver. Equivalent products include:
1. Texas Instruments SN75176A
2. Maxim Integrated MAX485
3. Analog Devices ADM485
4. Texas Instruments THVD1450
5. Intersil ISL3178E
These alternatives provide similar functionality with varying voltage ranges, data rates, and features. Always check the datasheets to ensure compatibility with specific application requirements.

Features

The LT1785CS8 is a robust RS485/RS422 transceiver designed for reliable data communication over long distances and in electrically noisy environments. Key features include:
1. Wide Supply Range: Operates from a single 5V supply, making it versatile for various applications.
2. High Data Rates: Capable of handling data rates up to 250 kbps, suitable for a wide range of communication needs.
3. Low Power Consumption: Designed for low power operation, which is crucial for battery-powered and energy-efficient systems.
4. Robustness: Features enhanced ESD protection and over-voltage protection, ensuring resilience against electrical spikes and noise.
5. Extended Common Mode Range: Supports a wide common mode voltage range, improving noise immunity and allowing for greater flexibility in cabling.
6. Short-Circuit Protection: Built-in protection against short circuits, safeguarding the device and connected equipment.
7. Thermal Shutdown: Includes thermal protection to prevent overheating, enhancing reliability and lifespan.
These features make the LT1785CS8 suitable for industrial, commercial, and automotive applications where robust and efficient data communication is required.

Pinout

The LT1785CS8 is an RS-485/RS-422 transceiver designed for high-speed data transmission. It comes in an 8-pin SOIC (Small Outline Integrated Circuit) package. Here is an outline of its pin functions:
1. RO (Pin 1): Receiver Output – This pin provides the output of the receiver.
2. RE (Pin 2): Receiver Output Enable – A low signal on this pin enables the receiver output; a high disables it.
3. DE (Pin 3): Driver Output Enable – A high signal on this pin enables the driver outputs; a low disables them (high impedance).
4. DI (Pin 4): Driver Input – Data input for the driver.
5. GND (Pin 5): Ground – Reference point for all signals.
6. A (Pin 6): Non-Inverting Driver Output / Receiver Input.
7. B (Pin 7): Inverting Driver Output / Receiver Input.
8. VCC (Pin 8): Supply Voltage – Power supply for the chip, typically 5V.
The LT1785CS8 is designed for robust communication over long distances and in electrically noisy environments, often used in industrial and communication systems.

Manufacturer

The LT1785CS8 is manufactured by Linear Technology Corporation. Linear Technology is a company that specializes in designing, manufacturing, and marketing a broad line of high-performance analog integrated circuits. Their products are used in a variety of applications, including telecommunications, networking products, industrial instrumentation, and automotive electronics. Linear Technology is known for its focus on innovation and quality in the analog semiconductor industry. In 2017, Linear Technology was acquired by Analog Devices, Inc., another leading company in the analog technology industry, which continues to support and provide these types of products.

Application

The LT1785CS8 is a high-speed RS485/RS422 transceiver designed for use in communication systems requiring robust data transfer over long distances. Key application areas include industrial automation, where it facilitates communication between controllers and devices, and building automation systems. It is also used in networked security systems for reliable data exchange between sensors and control hubs. Additionally, the LT1785CS8 is suitable for use in point-of-sale systems, where it ensures secure and efficient data transmission. Its capability to operate in electrically noisy environments makes it ideal for factory and process control applications. The device's low power consumption and fault protection features also make it suitable for use in portable and battery-powered communication equipment.

Package

The LT1785CS8 is an integrated circuit that comes in an 8-pin SOIC (Small Outline Integrated Circuit) package type. This package is designed for surface mounting on a printed circuit board (PCB).

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