Overview
The THVD1420DR from Texas Instruments is a robust, low-power, half-duplex RS-485 transceiver designed for industrial applications. It operates within a supply voltage range of 3 to 5.5 volts and supports data transmission rates up to 12 Mbps. This transceiver is known for its high level of ESD protection and its ability to function in a wide range of temperatures, from -40°C to 125°C. The device is available in both SOIC-8 and SOT-8 packages, offering flexibility in design and space-saving options.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 3 | 5 | 5.5 | V |
| Differential Input Voltage (VID) | -12 | 12 | V | |
| Input Voltage at Any Bus Terminal (VI) | -7 | 12 | V | |
| High-Level Input Voltage (VIH) | 2 | 5.5 | V | |
| Low-Level Input Voltage (VIL) | 0 | 0.8 | V | |
| Output Current (IO) | -60 | 60 | mA | |
| Differential Load Resistance (RL) | 54 | 60 | Ω | |
| Signaling Rate | 12 | Mbps | ||
| Junction Temperature (TJ) | -40 | 150 | °C | |
| Operating Ambient Temperature (TA) | -40 | 125 | °C |
Key Features
- Meets or exceeds the requirements of the TIA/EIA-485A standard.
- Operates from a single 3 to 5.5-V supply voltage.
- Half-duplex RS-422/RS-485 transceiver with data rates up to 12 Mbps.
- High ESD protection: ±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 SOIC-8 package.
- Extended industrial temperature range: -40°C to 125°C.
- Large receiver hysteresis for noise rejection.
- Low power consumption: Low standby supply current (< 1 µA) and quiescent current during operation (1.5 mA typical).
- 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 THVD1420DR? The THVD1420DR operates from a single 3 to 5.5-V supply voltage.
- What is the maximum data transmission rate of the THVD1420DR? The THVD1420DR supports data transmission rates up to 12 Mbps.
- What level of ESD protection does the THVD1420DR offer? The THVD1420DR offers high ESD protection, including ±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.
- In what temperature range can the THVD1420DR operate? The THVD1420DR operates in an extended industrial temperature range from -40°C to 125°C.
- What are the available package options for the THVD1420DR? The THVD1420DR is available in both SOIC-8 and SOT-8 packages.
- Does the THVD1420DR support hot plug-in capability? Yes, the THVD1420DR has glitch-free power-up/down for hot plug-in capability.
- How does the THVD1420DR handle open, short, or idle bus conditions? The THVD1420DR has open, short, and idle bus failsafe features to ensure the receiver output is not indeterminate in such conditions.
- What is the power consumption of the THVD1420DR? The THVD1420DR has low power consumption, with a standby supply current of less than 1 µA and a quiescent current during operation of 1.5 mA typical.
- Can the THVD1420DR be used in multi-point applications? Yes, the THVD1420DR is suitable for multi-point applications over long cable runs due to its wide common-mode voltage range and low input leakage on bus pins.
- How many bus nodes can the THVD1420DR support? The THVD1420DR can support up to 256 bus nodes as a 1/8 unit load.
