Overview
The SN75HVD12DR is a 3.3-V RS-485 transceiver produced by Texas Instruments. This monolithic integrated circuit is designed for bidirectional data communication on multipoint bus-transmission lines, adhering to the ANSI TIA/EIA-485-A and ISO 8482:1993 standards. It combines a 3-state differential line driver and a differential input line receiver, making it suitable for various industrial and commercial applications.
The device operates with a single 3.3-V power supply and features low-current standby mode, thermal shutdown protection, and glitch-free power-up and power-down protection, which is particularly useful for hot-plugging applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | -0.3 | 6 | V | |
| Voltage at A or B | -9 | 14 | V | |
| Input Voltage at D, DE, R, or RE | -0.5 | VCC + 0.5 | V | |
| Signaling Rate | 1 Mbps | |||
| Differential Load Resistance | 54 | 60 | Ω | |
| Differential Load Capacitance | 50 | pF | ||
| High-Level Output Current (Driver) | -60 | mA | ||
| Low-Level Output Current (Driver) | 60 | mA | ||
| High-Level Output Current (Receiver) | -8 | mA | ||
| Low-Level Output Current (Receiver) | 8 | mA | ||
| Junction Temperature | 145 | °C | ||
| Thermal Shutdown Junction Temperature | 165 | °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, supporting up to 256 nodes on the bus.
- Optional driver output transition times for signaling rates of 1 Mbps.
- Meets or exceeds ANSI TIA/EIA-485-A and ISO 8482:1993 standards.
- 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 SN75HVD12DR?
The SN75HVD12DR operates with a single 3.3-V power supply.
- What is the ESD protection level of the SN75HVD12DR?
The bus-pin ESD protection exceeds 16-kV HBM.
- How many nodes can be supported on the bus with the SN75HVD12DR?
The 1/8 Unit-load option supports up to 256 nodes on the bus.
- What signaling rates are supported by the SN75HVD12DR?
The SN75HVD12DR supports a signaling rate of 1 Mbps.
- Does the SN75HVD12DR meet any specific industry standards?
Yes, it meets or exceeds ANSI TIA/EIA-485-A and ISO 8482:1993 standards.
- What is the thermal shutdown junction temperature of the SN75HVD12DR?
The thermal shutdown junction temperature is 165°C.
- How does the SN75HVD12DR handle bus short-circuits?
The device has bus-pin short-circuit protection from –7 V to 12 V.
- What is the standby current of the SN75HVD12DR?
The standby current is typically 1 µA.
- Is the SN75HVD12DR suitable for hot-plugging applications?
Yes, it has glitch-free power-up and power-down protection for hot-plugging applications.
- What are some common applications of the SN75HVD12DR?
Common applications include digital motor control, utility meters, chassis-to-chassis interconnects, electronic security stations, industrial process control, building automation, and POS terminals and networks.
