Overview
The ST490ABDR is a low power, high-speed transceiver designed for RS-485 and RS-422 communications. Produced by STMicroelectronics, this device features one driver and one receiver in a full duplex configuration. It operates from a single 5V supply and is characterized by its low power consumption, drawing a typical supply current of 5mA when unloaded or fully loaded with disabled drivers. The ST490ABDR is protected by current limiting and thermal shutdown circuitry, ensuring robust operation against driver overload. Additionally, it includes a fail-safe feature that guarantees a logic high output if both receiver inputs are open circuit.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 5 | 5.5 | V |
| Supply Current (ISUPPLY) | 2 | 5 | - | mA |
| Driver Output Voltage (VOD) | 1.5 | 2.6 | 5 | V |
| Receiver Input Voltage Range | -7 | - | 12 | V |
| Receiver Differential Threshold Voltage (VTH) | -0.2 | - | 0.2 | V |
| Receiver Input Hysteresis (ΔVTH) | - | 70 | - | mV |
| Maximum Data Rate | - | 25 | - | Mbps |
| Operating Temperature Range | -40 | - | 85 | °C |
| ESD Protection | - | - | ±4 kV | - |
Key Features
- Low supply current: 5 mA max
- Current limiting and thermal shutdown for driver overload protection
- ±4 kV ESD protection
- -7 V to 12 V common mode input voltage range
- 70 mV typical input hysteresis
- Designed for 25 Mbps operation
- Operates from a single 5 V supply
- Fail-safe feature guarantees a logic high output if both receiver inputs are open circuit
Applications
The ST490ABDR is suitable for various industrial and commercial applications requiring reliable and high-speed RS-485 and RS-422 communication. These include:
- Industrial automation systems
- Building automation and control systems
- Point-of-sale terminals and other commercial equipment
- Medical devices requiring robust communication interfaces
- Automotive systems where high-speed data transmission is necessary
Q & A
- What is the typical supply current of the ST490ABDR?
The typical supply current is 5 mA.
- What is the operating voltage range for the ST490ABDR?
The device operates from a single 5 V supply.
- What is the maximum data rate supported by the ST490ABDR?
The device is designed for 25 Mbps operation.
- What kind of protection does the ST490ABDR have against driver overload?
The device features current limiting and thermal shutdown for driver overload protection.
- What is the common mode input voltage range for the receiver?
The common mode input voltage range is -7 V to 12 V.
- Does the ST490ABDR have ESD protection?
Yes, it has ±4 kV ESD protection.
- What is the fail-safe feature of the receiver input?
The fail-safe feature guarantees a logic high output if both receiver inputs are open circuit.
- What are the package options available for the ST490ABDR?
The device is available in DIP-8 and SO-8 packages.
- What is the operating temperature range for the ST490ABDR?
The operating temperature range is -40°C to 85°C.
- Is the ST490ABDR RoHS compliant?
Yes, the device is RoHS compliant with an Ecopack3 grade.
