Overview
The SN65HVD74DR is a 3.3-V full-duplex RS-485 transceiver produced by Texas Instruments. This device combines a differential driver and a differential receiver, operating from a single 3.3-V power supply. It is designed for demanding industrial applications, offering robust ESD protection and a wide operating temperature range from –40°C to 125°C. The SN65HVD74DR is available in both SOIC and MSOP packages, making it suitable for various design requirements.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC) | –0.5 | 5 | V | |
| Voltage Range at any Bus Pin (A, B, Y, or Z) | –13 | 16.5 | V | |
| Driver Differential Output Rise/Fall Time | 100 | 400 | 750 | ns |
| Driver Propagation Delay | 350 | 550 | ns | |
| Receiver Output Rise/Fall Time | 13 | 25 | ns | |
| Receiver Propagation Delay Time | 70 | 110 | ns | |
| Standby Supply Current | < 2 | µA | ||
| Quiescent Supply Current During Operation | < 1 | mA | ||
| ESD Protection (Human-Body Model) | > ±30 kV | |||
| ESD Protection (IEC Contact Discharge) | > ±12 kV |
Key Features
- Robust 3.3-V drivers and receivers with high levels of ESD protection (> ±30-kV HBM and > ±12-kV IEC61000-4-2 contact discharge)
- Full-duplex operation with separate input and output pins for bus communication
- Wide common-mode voltage range, suitable for multi-point applications over long cable runs
- No external enabling pins required for SN65HVD74; active-high driver enables and active-low receiver enables for other models
- Low standby current (< 5 µA) achievable by disabling both driver and receiver
- Large receiver hysteresis (80 mV) for noise rejection
- Low unit-loading allows over 200 connected nodes
- 5-V tolerant logic inputs compatible with 3.3-V or 5-V controllers
- Glitch-free power-up and power-down bus inputs and outputs
- Available in SOIC and MSOP packages
Applications
- Factory Automation
- Telecommunications Infrastructure
- Motion Control
- Industrial Automation
- Multi-point Applications over Long Cable Runs
Q & A
- What is the operating voltage range of the SN65HVD74DR?
The SN65HVD74DR operates from a single 3.3-V power supply.
- What are the package options for the SN65HVD74DR?
The device is available in both SOIC and MSOP packages.
- What is the temperature range for the SN65HVD74DR?
The device is characterized from –40°C to 125°C.
- What level of ESD protection does the SN65HVD74DR offer?
The device offers > ±30-kV HBM and > ±12-kV IEC61000-4-2 contact discharge ESD protection.
- Can the SN65HVD74DR be used in multi-point applications?
Yes, the device features a wide common-mode voltage range, making it suitable for multi-point applications over long cable runs.
- How many nodes can be connected using the SN65HVD74DR?
The device allows for over 200 connected nodes due to its low unit-loading.
- Is the SN65HVD74DR compatible with 5-V logic inputs?
Yes, the device has 5-V tolerant logic inputs compatible with 3.3-V or 5-V controllers.
- What is the standby current of the SN65HVD74DR when disabled?
The standby current is less than 5 µA when both the driver and receiver are disabled.
- Does the SN65HVD74DR require external enabling pins?
No, the SN65HVD74DR does not require external enabling pins.
- What are some typical applications of the SN65HVD74DR?
Typical applications include factory automation, telecommunications infrastructure, and motion control.
