CDSOT23- SM712 Ic Chip Programming Circuit Board RS -485 Port Protection

SN65HVD888

Bus-Polarity Correcting RS-485 Transceiver With IEC-ESD Protection

FEATURES

• Exceeds Requirements of EIA-485 Standard

• Bus-Polarity Correction within 76 ms (t_FS)

• Data Rate: 300 bps to 250 kbps

• Works with Two Configurations:

  – Failsafe Resistors Only

  – Failsafe and Differential Termination Resistors

• Up to 256 Nodes on a Bus (1/8 unit load)

• SOIC-8 Package for Backward Compatibility

• Bus-Pin Protection:

  – ±16 kV HBM protection

  – ±12 kV IEC61000-4-2 Contact Discharge

  – +4 kV IEC61000-4-4 Fast Transient Burst

APPLICATIONS

• E-Metering Networks

• Industrial Automation

• HVAC Systems

• DMX512-Networks

• Process Control

• Battery-Powered Applications

• Motion Control

• Telecom Equipment

DESCRIPTION

The SN65HVD888 is a low-power RS-485 transceiver with automatic bus-polarity correction and transient protection. Upon hot plug-in, the device detects and corrects the bus polarity within the first 76 ms of bus idling. On-chip transient protection protects the device against IEC61000 ESD and EFT transients. This device has robust drivers and receivers for demanding industrial applications. The bus pins are robust to electrostatic discharge (ESD) events, with high levels of protection to Human-Body Model (HBM), Air-Gap Discharge, and Contact Discharge specifications.

The device combines a differential driver and a differential receiver, which operate together from a single 5-V power supply. The driver differential outputs and the receiver differential inputs are connected internally to form a bus port suitable for half-duplex (two-wire bus) communication. The device features a wide common-mode voltage range making the device suitable for multi-point applications over long cable runs. The SN65HVD888 is available in an SOIC-8 package, and is characterized from –40°C to 85°C.

ABSOLUTE MAXIMUM RATINGS⁽¹⁾

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

TYPICAL NETWORK APPLICATION WITH POLARITY CORRECTION (POLCOR)

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