Overview
The SN65HVD12D from Texas Instruments is a 3.3-V RS-485 transceiver that combines a 3-state differential line driver and a differential input line receiver. This integrated circuit operates with a single 3.3-V power supply and is designed for balanced transmission lines, meeting or exceeding the requirements of ANSI standard TIA/EIA-485-A and ISO 8482:1993. It is particularly suited for bidirectional data communication on multipoint bus-transmission lines.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | -0.3 | 3.3 | 6 | V |
| Voltage at A or B | -9 | 14 | V | |
| Input Voltage at D, DE, R, or RE | -0.5 | VCC + 0.5 | V | |
| Differential Input Voltage (VID) | -12 | 12 | V | |
| High-Level Output Current (IOH) | -60 | mA | ||
| Low-Level Output Current (IOL) | 60 | mA | ||
| Differential Load Resistance (RL) | 54 | 60 | Ω | |
| Differential Load Capacitance (CL) | 50 | pF | ||
| Signaling Rate | 1 | Mbps | ||
| Junction Temperature (TJ) | 145 | °C |
Key Features
- Operates with a single 3.3-V power 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, 10 Mbps, and 32 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 range of the SN65HVD12D?
The SN65HVD12D operates with a single 3.3-V power supply, with a voltage range of –0.3 V to 6 V. - What is the signaling rate of the SN65HVD12D?
The signaling rate of the SN65HVD12D is 1 Mbps. - What is the maximum number of nodes supported on the bus?
The SN65HVD12D supports up to 256 nodes on the bus with the 1/8 unit-load option. - Does the SN65HVD12D have ESD protection?
Yes, the SN65HVD12D has bus-pin ESD protection that exceeds 16 kV HBM. - What are the common applications of the SN65HVD12D?
The SN65HVD12D is commonly used in digital motor control, utility meters, chassis-to-chassis interconnects, electronic security stations, industrial process control, building automation, and point-of-sale (POS) terminals and networks. - Does the SN65HVD12D support hot-plugging?
Yes, the SN65HVD12D features glitch-free power-up and power-down protection for hot-plugging applications. - What is the thermal shutdown junction temperature of the SN65HVD12D?
The thermal shutdown junction temperature of the SN65HVD12D is 165°C. - How does the SN65HVD12D handle standby mode?
The SN65HVD12D achieves a very low device standby supply current of 1 µA, typical, by disabling the driver and the receiver. - What are the package options for the SN65HVD12D?
The SN65HVD12D is available in SOIC (8-pin) and PDIP (8-pin) packages. - Does the SN65HVD12D meet any specific standards?
Yes, the SN65HVD12D meets or exceeds the requirements of ANSI standard TIA/EIA-485-A and ISO 8482:1993.
