Texas Instruments THVD24x2 Full Duplex RS-485 Transceivers
Texas Instruments THVD24x2 Full Duplex RS-485 Transceivers are ±70V fault-protected, full-duplex, RS-422/RS-485 transceivers operating on a single 3V to 5.5V supply. The bus interface pins are protected against overvoltage conditions during all modes of operation. This feature ensures robust communication in rugged industrial environments.
These transceivers eliminate the need for external system-level protection components by featuring integrated IEC ESD protection. Extended ±25V input common-mode range ensures reliable data communication over longer cable run lengths and/or in the presence of large ground loop voltages. An enhanced 250mV receiver hysteresis provides high noise rejection. In addition, the receiver fail-safe feature provides a logic high when the bus inputs are open or shorted together.
Texas Instruments THVD24x2 devices are available in small, thermally efficient VSON packages for space-constrained applications. The devices are characterized by ambient temperatures from -40°C to 125°C.
Features
- Meets or exceeds the requirements of the TIA/EIA-485A and TIA/EIA-422B standards
- 3V to 5.5V supply voltage
- Differential output exceeds 2.1V for PROFIBUS compatibility with a 5V supply
- Bus I/O protection
- ±70V DC bus fault
- ±16kV HBM ESD
- ±8kV IEC 61000-4-2 contact discharge
- ±8kV IEC 61000-4-2 air-gap discharge
- ±4kV IEC 61000-4-4 fast transient burst
- Full-duplex devices available in two-speed grades
- THVD2412 at 250kbps
- THVD2442 at 20Mbps
- -40°C to 125°C extended ambient temperature range
- ±25V extended operational common-mode range
- Enhanced receiver hysteresis for noise immunity
- Low power consumption
- Low shutdown supply current of <10µA
- Current during operation of <5.6mA
- Glitch-free power-up/down for hot plug-in capability
- Open, short, and idle bus failsafe
- Thermal shutdown
- 1/8 unit load (up to 256 bus nodes) in -7V to 12V common mode range
- Small 3mm x 3mm VSON package to save board space
Applications
- Motor drives
- Factory automation and control
- HVAC systems
- Building automation
- Grid infrastructure
- Electricity meters
- Process analytics
- Video surveillance
Additional Resources
Functional Block Diagram
Related Development Tool
Texas Instruments RS485FLDPLXDRCEVM Transceiver Evaluation Module
For quick prototyping of full-duplex ±70V tolerant RS-485 transceivers in the VSON (DRC) package.