Specifications
| Attribute | Value |
| Package | Tube,Tube |
| ProductStatus | Obsolete |
| Type | Transceiver |
| Protocol | RS422, RS485 |
| NumberofDrivers/Receivers | 1/1 |
| Duplex | Full |
| ReceiverHysteresis | 70 mV |
| DataRate | 2.5Mbps |
| Voltage-Supply | 4.75V ~ 5.25V |
| OperatingTemperature | -40°C ~ 85°C |
| MountingType | Surface Mount |
| Package/Case | 14-SOIC (0.154, 3.90mm Width) |
Overview
Description
The MAX491EESD is a low-power RS-485/RS-422 transceiver designed for multipoint transmission on long communication lines. It is part of the MAX491 series, which is renowned for its high speed and low power consumption. Operating on a single 5V power supply, the MAX491EESD can transmit and receive at data rates up to 2.5 Mbps.
The device features a reduced slew-rate driver that minimizes EMI and reflections caused by improperly terminated cables, making it suitable for industrial environments. It includes a fail-safe receiver, which ensures a known output state when the bus is idle, open, or shorted, enhancing reliability. The MAX491EESD is characterized by its low quiescent current (typically 300 µA), making it energy-efficient for battery-powered applications.
Its wide common-mode range and high ESD protection (up to ±15 kV) ensure robust performance in harsh environments. The transceiver also offers a 1/8-unit load, allowing up to 256 transceivers on the bus. With these features, the MAX491EESD is suitable for various communication applications requiring reliable and efficient data transmission.
The device features a reduced slew-rate driver that minimizes EMI and reflections caused by improperly terminated cables, making it suitable for industrial environments. It includes a fail-safe receiver, which ensures a known output state when the bus is idle, open, or shorted, enhancing reliability. The MAX491EESD is characterized by its low quiescent current (typically 300 µA), making it energy-efficient for battery-powered applications.
Its wide common-mode range and high ESD protection (up to ±15 kV) ensure robust performance in harsh environments. The transceiver also offers a 1/8-unit load, allowing up to 256 transceivers on the bus. With these features, the MAX491EESD is suitable for various communication applications requiring reliable and efficient data transmission.
Equivalent
The MAX491EESD is a low-power RS-485/RS-422 transceiver. Equivalent products include:
1. TI SN65HVD485E
2. TI SN75176B
3. Analog Devices ADM485
4. STMicroelectronics ST485
5. NXP PCA82C250
These equivalents provide similar functionalities, such as differential data transmission and reception, and are suitable for various industrial and communication applications. Always check the datasheets for specific electrical characteristics and pin compatibility.
1. TI SN65HVD485E
2. TI SN75176B
3. Analog Devices ADM485
4. STMicroelectronics ST485
5. NXP PCA82C250
These equivalents provide similar functionalities, such as differential data transmission and reception, and are suitable for various industrial and communication applications. Always check the datasheets for specific electrical characteristics and pin compatibility.
Features
The MAX491EESD is a low-power, low-dropout RS-485/RS-422 transceiver designed for extended battery life in portable applications. Key features include:
1. Low Power Consumption: Operates on a single supply voltage from 4.75V to 5.25V with minimal power usage, making it suitable for battery-powered devices.
2. High Data Rate: Supports data transmission speeds up to 2.5Mbps, enabling fast and efficient communication.
3. Extended ESD Protection: Offers enhanced electrostatic discharge (ESD) protection up to ±15kV, ensuring robustness and reliability in various environments.
4. Fail-Safe Receiver: Provides a fail-safe mechanism that ensures the receiver outputs a known state when the bus is idle, open, or shorted.
5. Half-Duplex Communication: Supports half-duplex communication, allowing for bidirectional data transmission on a single pair of wires.
6. Slew-Rate Limiting: Features adjustable slew-rate limiting to reduce EMI emissions and improve signal integrity.
7. Small Package Size: Available in an 8-pin SOIC package, making it easy to integrate into space-constrained applications.
These features make the MAX491EESD an ideal choice for efficient and reliable data communication in harsh and space-limited environments.
1. Low Power Consumption: Operates on a single supply voltage from 4.75V to 5.25V with minimal power usage, making it suitable for battery-powered devices.
2. High Data Rate: Supports data transmission speeds up to 2.5Mbps, enabling fast and efficient communication.
3. Extended ESD Protection: Offers enhanced electrostatic discharge (ESD) protection up to ±15kV, ensuring robustness and reliability in various environments.
4. Fail-Safe Receiver: Provides a fail-safe mechanism that ensures the receiver outputs a known state when the bus is idle, open, or shorted.
5. Half-Duplex Communication: Supports half-duplex communication, allowing for bidirectional data transmission on a single pair of wires.
6. Slew-Rate Limiting: Features adjustable slew-rate limiting to reduce EMI emissions and improve signal integrity.
7. Small Package Size: Available in an 8-pin SOIC package, making it easy to integrate into space-constrained applications.
These features make the MAX491EESD an ideal choice for efficient and reliable data communication in harsh and space-limited environments.
Pinout
The MAX491EESD is an RS-485/RS-422 transceiver designed for communication in balanced multipoint bus transmission lines. It has an 8-pin configuration. Here is a brief overview of its pin functions:
1. RO (Receiver Output): Outputs the data received from the bus.
2. RE̅ (Receiver Enable): Active-low input to enable the receiver; when low, the receiver is enabled.
3. DE (Driver Enable): Controls the driver; when high, the driver outputs are enabled.
4. DI (Driver Input): Input for data to be transmitted on the bus.
5. GND (Ground): Ground reference for the device.
6. A (Non-inverting Receiver Input/Driver Output): Differential bus line.
7. B (Inverting Receiver Input/Driver Output): Differential bus line.
8. VCC (Power Supply Voltage): Positive power supply for the device.
The MAX491EESD is designed to operate at a high data rate and is suitable for long-distance communication, offering features like low power consumption and excellent ESD protection.
1. RO (Receiver Output): Outputs the data received from the bus.
2. RE̅ (Receiver Enable): Active-low input to enable the receiver; when low, the receiver is enabled.
3. DE (Driver Enable): Controls the driver; when high, the driver outputs are enabled.
4. DI (Driver Input): Input for data to be transmitted on the bus.
5. GND (Ground): Ground reference for the device.
6. A (Non-inverting Receiver Input/Driver Output): Differential bus line.
7. B (Inverting Receiver Input/Driver Output): Differential bus line.
8. VCC (Power Supply Voltage): Positive power supply for the device.
The MAX491EESD is designed to operate at a high data rate and is suitable for long-distance communication, offering features like low power consumption and excellent ESD protection.
Manufacturer
The MAX491EESD is manufactured by Maxim Integrated, which is now part of Analog Devices, Inc. Maxim Integrated is known for designing and manufacturing analog and mixed-signal integrated circuits. The company specializes in a wide range of semiconductor products, including power management, sensors, amplifiers, and interface ICs, among others. These components are used across various industries, including consumer electronics, automotive, industrial, communications, and healthcare. As of August 2021, Maxim Integrated became a part of Analog Devices, a company with a similar focus on analog, mixed-signal, and digital signal processing technologies. Analog Devices is a leading global high-performance semiconductor company that provides solutions for signal processing and power management technologies.
Application
The MAX491EESD is a low-power RS-485/RS-422 transceiver suitable for high-speed communication in industrial and commercial applications. Key application areas include:
1. Industrial Automation: Facilitates robust communication in PLCs and factory automation systems.
2. Building Automation: Used in HVAC systems, access control, and security systems.
3. Telecommunications: Supports data transfer in telecom infrastructure.
4. Networking: Ideal for use in network routers and switches.
5. Instrumentation: Ensures reliable data communication in test and measurement equipment.
6. Energy Management: Used in smart grids and energy metering systems.
Its high-speed operation and noise immunity make it ideal for environments requiring reliable data transmission.
1. Industrial Automation: Facilitates robust communication in PLCs and factory automation systems.
2. Building Automation: Used in HVAC systems, access control, and security systems.
3. Telecommunications: Supports data transfer in telecom infrastructure.
4. Networking: Ideal for use in network routers and switches.
5. Instrumentation: Ensures reliable data communication in test and measurement equipment.
6. Energy Management: Used in smart grids and energy metering systems.
Its high-speed operation and noise immunity make it ideal for environments requiring reliable data transmission.
Package
The MAX491EESD is a part of the MAX491 family, typically packaged in an 8-pin SOIC (Small Outline Integrated Circuit) package. This package type is compact and suitable for surface-mount assembly, making it ideal for applications requiring efficient use of PCB space.
