Overview
The SN65HVD55D is a high output full-duplex RS-485 driver and receiver produced by Texas Instruments. This device is part of the SN65HVD5X series, designed for balanced transmission lines and compliance with ANSI TIA/EIA-485A, TIA/EIA-422-B, ITU-T v.11, and ISO 8482:1993 standards. Each driver and receiver has separate input and output pins, enabling full-duplex bus communication designs. Although the SN65HVD55D is currently obsolete and no longer in production, it remains relevant for understanding and maintaining existing systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 14 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage (VCC) | 4.5 to 5.5 | V |
| Signaling Rate | 1 Mbps | - |
| Differential Load Resistance (RL) | 54 to 60 | Ω |
| High-Level Output Current (IOH) | -60 | mA |
| Low-Level Output Current (IOL) | 60 | mA |
| Standby Current | < 1 μA | - |
| Bus-Pin ESD Protection | > 15 kV HBM | - |
Key Features
- 1/8 Unit-load option available, supporting up to 256 nodes on the bus
- Bus-pin ESD protection exceeds 15 kV HBM
- Optional driver output transition times for signaling rates of 1 Mbps, 5 Mbps, and 25 Mbps
- Low-current standby mode with less than 1 μA current
- Glitch-free power-up and power-down bus I/Os
- Bus idle, open, and short circuit failsafe
- Designed for RS-422 and RS485 networks
- High output feature providing more noise margin than typical RS-485 drivers
Applications
- Utility meters
- Chassis-to-chassis interconnects
- DTE/DCE Interfaces
- Industrial, process, and building automation
- Point-of-sale (POS) terminals and networks
Q & A
- What is the operating temperature range of the SN65HVD55D?
The operating temperature range is from -40°C to 85°C.
- What is the supply voltage range for the SN65HVD55D?
The supply voltage range is from 4.5V to 5.5V.
- What is the signaling rate of the SN65HVD55D?
The signaling rate is 1 Mbps.
- What is the differential load resistance for the SN65HVD55D?
The differential load resistance is between 54Ω and 60Ω.
- Does the SN65HVD55D have ESD protection?
- What is the standby current of the SN65HVD55D?
The standby current is less than 1 μA.
- Is the SN65HVD55D designed for full-duplex communication?
- What standards does the SN65HVD55D comply with?
- What are some common applications of the SN65HVD55D?
- Is the SN65HVD55D still in production?
