描述 Description

THVD1428 is a half-duplex RS-485 transceiver with integrated surge protection. Surge protection is achieved by integrating transient voltage suppressor (TVS) diodes in the standard 8-pin SOIC (D) package. This feature provides a substantial increase in reliability for better immunity to noise transients coupled to the data cable, eliminating the need for external protection components.

This device operates from a single 3.3-V or 5-V supply and features a wide common-mode voltage range which makes it suitable for multi-point applications over long cable runs.

The device is available in the industry standard SOIC package for easy drop-in without any PCB changes. The device is characterized over ambient free-air temperatures from –40°C to 125°C.

特性 Features

? Meets or exceeds the requirements of the TIA/EIA-485A standard
? 3-V to 5.5-V Supply voltage
? Bus I/O protection
? ± 16 kV HBM ESD
? ± 4 kV IEC 61000-4-2 Contact discharge
? ± 8 kV IEC 61000-4-2 Air-gap discharge
? ± 4 kV IEC 61000-4-4 Electrical fast transient
? ± 3 kV IEC 61000-4-5 1.2/50-μs Surge

? Supports 20 Mbps
? Extended ambient temperature range: -40°C to 125°C
? Extended operational common-mode range: ± 12 V
? Receiver hysteresis for noise rejection: 30 mV
? Low power consumption
? Standby supply current:
? Glitch-free power-up/down for hot plug-in capability
? Open, short, and idle bus fail-safe
? 1/8 Unit load (Up to 256 bus nodes)
? Industry standard 8-Pin SOIC for drop-in compatibility