Overview
The ST485ERBDR is a low-power transceiver designed for RS-485 and RS-422 communication, manufactured by STMicroelectronics. This transceiver is optimized for bi-directional data communication on multipoint bus transmission lines, particularly in half-duplex applications. It features a single driver and a single receiver, each protected against ±15 kV electrostatic discharge (HBM) and ±8 kV (IEC-1000-4-2 contact discharge) shocks, without latch-up. The device operates from a single 5 V supply and draws a typical supply current of 300 µA when unloaded or fully loaded with disabled drivers.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 5 V ± 5% | V |
| Quiescent Current | 300 µA (typ.) | µA |
| Common Mode Input Voltage Range | -7 V to 12 V | V |
| Propagation Delay | 30 ns (typ.) | ns |
| Skew | 5 ns (typ.) | ns |
| ESD Protection | ±15 kV (HBM), ±8 kV (IEC-1000-4-2 contact discharge) | kV |
| Driver Short-Circuit Current | 35 mA to 250 mA | mA |
| Operating Temperature Range | -40°C to 85°C | °C |
| Package | SO-8 | - |
Key Features
- Low quiescent current: 300 µA (typ.)
- Designed for RS-485 interface applications
- -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
- Operates from a single 5 V supply
- Current limiting and thermal shutdown for driver overload protection
- ESD protection: ±15 kV (HBM), ±8 kV (IEC-1000-4-2 contact discharge)
- Allows up to 64 transceivers on the bus
Applications
The ST485ERBDR is suitable for various applications requiring reliable and low-power 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
- Medical devices requiring robust communication interfaces
- Automotive systems where reliable data transmission is critical
Q & A
- What is the typical quiescent current of the ST485ERBDR?
The typical quiescent current of the ST485ERBDR is 300 µA.
- What is the operating voltage range of the ST485ERBDR?
The ST485ERBDR operates from a single 5 V supply.
- What level of ESD protection does the ST485ERBDR offer?
The ST485ERBDR offers ±15 kV ESD protection (HBM) and ±8 kV ESD protection (IEC-1000-4-2 contact discharge).
- What is the propagation delay of the ST485ERBDR?
The propagation delay of the ST485ERBDR is typically 30 ns.
- What is the skew of the ST485ERBDR?
The skew of the ST485ERBDR is typically 5 ns.
- How many transceivers can be connected on the bus using the ST485ERBDR?
Up to 64 transceivers can be connected on the bus using the ST485ERBDR.
- What is the operating temperature range of the ST485ERBDR?
The operating temperature range of the ST485ERBDR is -40°C to 85°C.
- What type of package is the ST485ERBDR available in?
The ST485ERBDR is available in an SO-8 package.
- Does the ST485ERBDR have current limiting and thermal shutdown protection?
Yes, the ST485ERBDR has current limiting and thermal shutdown protection for driver overload.
- What is the common mode input voltage range of the ST485ERBDR?
The common mode input voltage range of the ST485ERBDR is -7 V to 12 V.
