Overview
The ST485EXDR is a low-power RS-485/RS-422 transceiver designed by STMicroelectronics. This component is optimized for bi-directional data communications on multipoint bus transmission lines, particularly in half-duplex applications. It operates from a single 5V supply and features a low quiescent current of 300 µA, making it energy-efficient. The ST485EXDR is protected against ±15 kV electrostatic discharge (ESD) shocks and offers current limiting and thermal shutdown for driver overload protection, ensuring reliable operation in various environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 4.75V to 5.25V | V |
| Quiescent Current | 300 µA | µA |
| Common Mode Input Voltage Range | -7V to 12V | V |
| Input Hysteresis | 70 mV | mV |
| Propagation Delay | 30 ns | ns |
| Output Skew | 5 ns | ns |
| ESD Protection | ±15 kV (HBM), ±8 kV (IEC-1000-4-2) | kV |
| Maximum Data Rate | 5 Mbps | Mbps |
| Temperature Range | -55°C to 125°C | °C |
| Package Type | SOIC-8 | |
| Number of Transceivers on the Bus | Up to 256 |
Key Features
- Low quiescent current of 300 µA, reducing power consumption.
- Designed for RS-485 interface applications with a common mode input voltage range from -7V to 12V.
- Driver maintains high impedance in 3-state or with power OFF.
- Current limiting and thermal shutdown for driver overload protection.
- ESD protection up to ±15 kV (HBM) and ±8 kV (IEC-1000-4-2).
- Supports up to 256 transceivers on the bus.
- Operates over a wide temperature range from -55°C to 125°C.
- Maximum data rate of 5 Mbps.
Applications
The ST485EXDR is suitable for various applications requiring reliable and efficient serial communication, including:
- Industrial automation and control systems.
- Building automation and control systems.
- Point-of-sale terminals and other commercial equipment.
- Medical devices requiring robust serial communication.
- Automotive systems where high reliability and ESD protection are crucial.
Q & A
- What is the operating voltage range of the ST485EXDR?
The ST485EXDR operates from a single 5V supply, with a voltage range of 4.75V to 5.25V.
- What is the quiescent current of the ST485EXDR?
The quiescent current is 300 µA.
- What is the common mode input voltage range of the ST485EXDR?
The common mode input voltage range is from -7V to 12V.
- What is the ESD protection level of the ST485EXDR?
The ST485EXDR is protected against ±15 kV (HBM) and ±8 kV (IEC-1000-4-2) ESD shocks.
- What is the maximum data rate supported by the ST485EXDR?
The maximum data rate is 5 Mbps.
- How many transceivers can be connected on the bus using the ST485EXDR?
Up to 256 transceivers can be connected on the bus.
- What is the temperature range of the ST485EXDR?
The temperature range is from -55°C to 125°C.
- What type of package does the ST485EXDR come in?
The ST485EXDR comes in an SOIC-8 package.
- Does the ST485EXDR have built-in protection against driver overload?
Yes, it has current limiting and thermal shutdown for driver overload protection.
- What are some typical applications of the ST485EXDR?
Typical applications include industrial automation, building automation, point-of-sale terminals, medical devices, and automotive systems.
