Overview
The ST485EBDR is a low power transceiver designed for RS-485 and RS-422 communication, manufactured by STMicroelectronics. This transceiver is optimized for bi-directional data communications on multipoint bus transmission lines in half-duplex applications. It features high electrostatic discharge (ESD) protection and low power consumption, making it suitable for a variety of industrial and commercial applications.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V |
| Operating Temperature Range | -40°C to +85°C |
| ESD Protection | ±15 kV (H.B.M.), ±8 kV (IEC-1000-4-2 contact discharge) |
| Supply Current | 300 µA (typ.) |
| Common Mode Input Voltage Range | -7 V to 12 V |
| Propagation Delay | 30 ns |
| Skew | 5 ns |
| Input Hysteresis | 70 mV (typ.) |
| Package Style | SOIC-8 |
| Mounting Method | Surface Mount |
| Duplex Mode | Half-Duplex |
| Number of Drivers/Receivers | 1 Driver, 1 Receiver |
Key Features
- Low quiescent current: 300 µA (typ.)
- ESD protection: ±15 kV (H.B.M.), ±8 kV (IEC-1000-4-2 contact discharge)
- Operates from a single 5 V supply
- Designed for RS-485 interface application
- -7 V to 12 V common mode input voltage range
- Driver maintains high impedance in 3-state or with the power OFF
- 70 mV typical input hysteresis
- 30 ns propagation delay, 5 ns skew
- Current limiting and thermal shutdown for driver overload protection
- Allows up to 256 transceivers on the bus
Applications
The ST485EBDR is suitable for various applications requiring reliable and high-speed RS-485 and RS-422 communication. These include:
- Industrial automation and control systems
- Building automation and control systems
- Point-of-sale terminals and other commercial equipment
- Remote sensors and data acquisition systems
- Multipoint bus transmission lines in half-duplex configurations
Q & A
- What is the primary function of the ST485EBDR?
The ST485EBDR is a low power transceiver for RS-485 and RS-422 communication.
- What is the operating temperature range of the ST485EBDR?
The operating temperature range is -40°C to +85°C.
- What level of ESD protection does the ST485EBDR offer?
The ST485EBDR offers ±15 kV (H.B.M.) and ±8 kV (IEC-1000-4-2 contact discharge) ESD protection.
- How much supply current does the ST485EBDR typically draw?
The ST485EBDR typically draws 300 µA of supply current.
- What is the common mode input voltage range of the ST485EBDR?
The common mode input voltage range is -7 V to 12 V.
- What is the propagation delay and skew of the ST485EBDR?
The propagation delay is 30 ns, and the skew is 5 ns.
- What type of package does the ST485EBDR come in?
The ST485EBDR comes in an SOIC-8 package.
- How many transceivers can be connected on the bus using the ST485EBDR?
Up to 256 transceivers can be connected on the bus.
- Does the ST485EBDR have thermal shutdown protection?
- What is the mounting method for the ST485EBDR?
The mounting method is surface mount.
