Overview
The SN65HVD12DG4 is a 3.3-V differential transceiver designed by Texas Instruments for RS-485 communication. This device combines a 3-state differential line driver and a differential input line receiver, making it suitable for bidirectional data communication on multipoint bus-transmission lines. It operates with a single 3.3-V power supply and meets or exceeds the requirements of ANSI standard TIA/EIA-485-A and ISO 8482:1993. The SN65HVD12DG4 is particularly useful in applications requiring robust and reliable communication over long distances.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | –0.3 to 6 | V |
| Signaling Rate | 1 Mbps | |
| Unit Load | 1/8 | |
| Operating Temperature Range | –40°C to 85°C | °C |
| Junction Temperature (TJ) | 145 | °C |
| Bus-Pin ESD Protection | >16 kV HBM | |
| Differential Load Resistance (RL) | 54 to 60 | Ω |
| Differential Load Capacitance (CL) | 50 | pF |
| High-Level Output Current (IOH) | –60 | mA |
| Low-Level Output Current (IOL) | 60 | mA |
| Thermal Shutdown Junction Temperature (TJSD) | 165 | °C |
Key Features
- Operates with a 3.3-V supply.
- Bus-pin ESD protection exceeds 16-kV HBM.
- 1/8 Unit-load option available (up to 256 nodes on the bus).
- Optional driver output transition times for signaling rates of 1 Mbps.
- Meets or exceeds the requirements of ANSI TIA/EIA-485-A and ISO 8482:1993.
- Bus-pin short-circuit protection from –7 V to 12 V.
- Low-current standby mode: 1 µA, typical.
- Open-circuit, idle-bus, and shorted-bus fail-safe receiver.
- Thermal shutdown protection.
- Glitch-free power-up and power-down protection for hot-plugging applications.
Applications
- Digital motor control.
- Utility meters.
- Chassis-to-chassis interconnects.
- Electronic security stations.
- Industrial process control.
- Building automation.
- Point-of-sale (POS) terminals and networks.
Q & A
- What is the operating voltage of the SN65HVD12DG4?
The SN65HVD12DG4 operates with a 3.3-V supply. - What is the signaling rate of the SN65HVD12DG4?
The signaling rate of the SN65HVD12DG4 is 1 Mbps. - What is the unit load of the SN65HVD12DG4?
The unit load of the SN65HVD12DG4 is 1/8. - What is the operating temperature range of the SN65HVD12DG4?
The operating temperature range is –40°C to 85°C. - Does the SN65HVD12DG4 have ESD protection?
Yes, the SN65HVD12DG4 has bus-pin ESD protection that exceeds 16-kV HBM. - What are the typical applications of the SN65HVD12DG4?
Typical applications include digital motor control, utility meters, chassis-to-chassis interconnects, electronic security stations, industrial process control, building automation, and POS terminals and networks. - Does the SN65HVD12DG4 support hot-plugging?
Yes, it provides glitch-free power-up and power-down protection for hot-plugging applications. - What is the thermal shutdown junction temperature of the SN65HVD12DG4?
The thermal shutdown junction temperature is 165°C. - How many nodes can be supported on the bus with the SN65HVD12DG4?
Up to 256 nodes can be supported on the bus. - What is the standby current of the SN65HVD12DG4?
The standby current is typically 1 µA.
