- Overview
- Features
- Diagrams
- Max Ratings
- Part Numbers
Overview
 The ADM1491E is an RS-485 transceiver with ±8 kV ESD protection and is suitable for high speed, full-duplex communication on multipoint transmission lines. In particular, the ADM1491E is designed for use in motor control applications requiring communications at data rates up to 16 Mbps.
The ADM1491E is designed for balanced transmission lines and complies with TIA/EIA-485-A-98. The device has a 12 kΩ receiver input impedance for unit load RS-485 operation allowing up to 32 nodes on the bus.
The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to ±8 kV using the human body model (HBM).
The ADM1491E operates from a single 5V power supply. Excessive power dissipation caused by bus contention or output shorting is prevented by short-circuit protection and thermal circuitry.
Short-circuit protection circuits limit the maximum output current to ±250 mA during fault conditions. A thermal shutdown circuit senses if the die temperature rises above 150°C and forces the driver outputs into a high impedance state under this condition. Datasheet |
Features
Features
- RS-485/RS-422 full duplex transceiver, for high speed motor control applications
- 16 Mbps data rate
- ±8 kV ESD protection on RS-485 input/output pins
- Complies with ANSI/TIA/EIA-485-A-1998
- Open circuit fail-safe
- Suitable for 5V power supply applications
- 32 nodes on the bus (1 unit load)
- Thermal shutdown protection
- Operating temperature range: –40°C to +85°C
- Packages:
– Narrow-body 14-lead SOIC
– 10-lead MSOP
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Absolute Maximum Ratings
| VCC to GND |
–0.3V to +7V |
| Digital I/O Voltage (DE, RE) |
–0.3V to VCC + 0.3V |
| Driver Input Voltage (DI) |
–0.3V to VCC + 0.3V |
| Receiver Output Voltage (RO) |
–0.3V to VCC + 0.3V |
| Driver Output/Receiver Input Voltage (A, B, Y, Z) |
–9V to +14V |
| Operating Temperature Range |
–40°C to +85°C |
| Storage Temperature Range |
–55°C to +150°C |
| ESD (HBM) on A, B, Y, and Z |
±8 kV |
| Datasheet |
| TA = 25°C, unless otherwise noted. |
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Part Numbers
ADI P/N |
Digi-Key P/N |
Package |
Datasheet |
ADM1491EBRZ |
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14-SOIC |
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ADM1491EBRMZ |
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10-MSOP |
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ADM1491E: 
