Overview
The THVD1400, produced by Texas Instruments, is a robust half-duplex RS-485 transceiver designed for industrial applications. It operates from a single 3-V to 5.5-V supply and meets or exceeds the requirements of the TIA/EIA-485A standard. This device is notable for its high-level ESD protection, low power consumption, and glitch-free power-up/down capability, making it suitable for a wide range of industrial environments.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | -0.5 | 7 | V | |
| Input Voltage at Logic Pins (VL) | -0.3 | 5.7 | V | |
| Differential Input Voltage (VA, VB) | -12 | 12 | V | |
| Signaling Rate | 500 kbps | kbps | ||
| Operating Ambient Temperature (TA) | -40 | 125 | °C | |
| Junction Temperature (TJ) | -40 | 150 | °C | |
| ESD Protection (IEC 61000-4-2 Contact Discharge) | ±12 kV | |||
| ESD Protection (IEC 61000-4-2 Air Gap Discharge) | ±15 kV | |||
| Bus Fault Protection | ±16 V | |||
| Quiescent Current (Driver and Receiver Enabled) | 1.5 | 3 | mA | |
| Standby Supply Current | 0.1 | 1 | µA |
Key Features
- Meets or exceeds the requirements of the TIA/EIA-485A standard.
- Operates from a single 3-V to 5.5-V supply.
- Half-duplex RS-422/RS-485 transceiver with a data rate of up to 500 kbps.
- High-level ESD protection: ±16-kV HBM, ±12-kV IEC 61000-4-2 Contact Discharge, ±15-kV IEC 61000-4-2 Air Gap Discharge, and ±4-kV IEC 61000-4-4 Fast Transient Burst.
- Small, space-saving 8-pin SOT package option (2.1 mm x 1.2 mm) and industry-standard 8-pin SOIC package.
- Extended industrial temperature range: -40°C to 125°C.
- Large receiver hysteresis for noise rejection.
- Low power consumption with low standby supply current (< 1 µA) and quiescent current during operation (1.5 mA typ).
- Glitch-free power-up/down for hot plug-in capability.
- Open, short, and idle bus failsafe.
- 1/8 Unit load (Up to 256 bus nodes).
Applications
- Factory automation and control.
- Building automation.
- Grid infrastructure.
- Motor drives.
- Power delivery.
- Industrial transport.
- HVAC systems.
- Video surveillance.
- Smart meters.
Q & A
- What is the operating voltage range of the THVD1400?
The THVD1400 operates from a single 3-V to 5.5-V supply.
- What is the data rate of the THVD1400?
The THVD1400 has a data rate of up to 500 kbps.
- What kind of ESD protection does the THVD1400 offer?
The THVD1400 offers high-level ESD protection including ±16-kV HBM, ±12-kV IEC 61000-4-2 Contact Discharge, ±15-kV IEC 61000-4-2 Air Gap Discharge, and ±4-kV IEC 61000-4-4 Fast Transient Burst.
- What are the package options available for the THVD1400?
The THVD1400 is available in both small, space-saving 8-pin SOT packages (2.1 mm x 1.2 mm) and industry-standard 8-pin SOIC packages.
- What is the operating temperature range of the THVD1400?
The THVD1400 operates over an extended industrial temperature range of -40°C to 125°C.
- Does the THVD1400 support hot plug-in capability?
Yes, the THVD1400 has glitch-free power-up/down for hot plug-in capability.
- What is the standby supply current of the THVD1400?
The standby supply current of the THVD1400 is less than 1 µA.
- What are some common applications of the THVD1400?
The THVD1400 is commonly used in factory automation, building automation, grid infrastructure, motor drives, power delivery, industrial transport, HVAC systems, video surveillance, and smart meters.
- How many bus nodes can the THVD1400 support?
The THVD1400 can support up to 256 bus nodes as a 1/8 unit load.
- Does the THVD1400 have built-in failsafe mechanisms?
Yes, the THVD1400 has open, short, and idle bus failsafe mechanisms.
