XBLW MAX485: 10Mbps Half‑Duplex RS485 Transceiver with High‑ESD Protection & Low‑Power Design

XBLW MAX485 is a half‑duplex RS485 communication transceiver supporting 3V ~ 5.5V wide supply voltage and featuring ±15 kV ESD protection. This device integrates a driver and a receiver, supporting data rates up to 10 Mbps. It is suitable for industrial control, power‑system communication, smart electricity meters, factory automation and other application scenarios.

Product Features

l High‑speed communication: supports 10 Mbps data transmission rate

l Wide supply voltage: 3.0V ~ 5.5V

l High ESD protection: ±15 kV (HBM) on A/B pins, ±8 kV for other pins

l Low power consumption: typical operating current 300 µA, down to 1 µA in shutdown mode

l Common‑mode input range: ‑7V ~ +12V

l Bus‑load capacity: supports up to 256 nodes

l Fault‑protection function: fail‑safe mode for open‑circuit and short‑circuit faults

l Thermal shutdown & over‑current protection: prevents driver damage from overheating and short‑circuit

Pin Definition

Mode Description

MAX485 controls its operating modes via combined logic of the Receiver‑Enable (RE) and Driver‑Enable (DE) pins:

l When DE = High and RE = High, the device enters Transmit Mode: it converts single‑ended data on the DI pin into differential signals for output onto the A / B bus lines;

l When DE = Low and RE = Low, the device switches to Receive Mode: differential bus signals are converted to single‑ended signals and output from the RO pin, with built‑in input open‑circuit fail‑safe function;

l When DE = Low and RE = High, the part goes into Shutdown Mode. Both driver and receiver present high‑impedance state, and power consumption drops below 1 µA for power‑saving operation. This flexible control scheme enables efficient management of data direction and system power draw.

Core Characteristics

1. Electrical‑Performance Advantages

High‑speed communication capability: supports maximum 10 Mbps data rate to satisfy most industrial field‑bus requirements.

Wide supply‑voltage range: 3.0V ~ 5.5V, compatible with 3.3V and 5V system designs.

Low‑power design: typical quiescent current of 300 µA in operating mode, and as low as 1 µA under shutdown mode.

High ESD protection: A/B pins feature ±15 kV (HBM) ESD protection; other pins provide ±8 kV protection.

2. Reliability‑Oriented Design

Thermal‑shutdown protection: built‑in over‑temperature protection circuit to protect the driver against over‑heat damage.

Short‑circuit current limiting: the driver integrates short‑circuit protection to improve system reliability.

Fail‑safe design: receiver outputs logic‑high level under input open‑circuit or short‑circuit conditions.

Industrial‑grade temperature range: ‑40 ℃ ~ +85 ℃ operating‑temperature range.

3. System‑Integration Advantages

High node capacity: 1/8‑unit‑load design, supporting up to 256 nodes on one single bus.

Supply‑rail‑independent operation: driver output stays high‑impedance during power‑up / power‑down sequences.

Excellent compatibility: fully compliant with the RS‑485 standard and pin‑to‑pin interchangeable with competing devices.

Absolute Maximum Ratings

Typical Applications

l Half‑Duplex RS485 Networks: A half‑duplex RS‑485 network is a multi‑node communication system using one pair of differential signal lines (A and B) for data transmission. Its core feature is that all devices share the same bus. Controlled by communication protocols, only one device acts as transmitter at any given time while remaining devices work as receivers. XBLW MAX485 supports bus connections of up to 256 nodes, enabling stable, noise‑immune, low‑cost multi‑point communication.

l Industrial‑Control Systems: MAX485 is a core IC that realizes reliable inter‑device communication within industrial‑control systems. As an RS‑485 transceiver, it converts controller logic‑level signals into noise‑resistant differential signals and builds multi‑node networks over one pair of twisted‑pair cables. Adopting half‑duplex communication mode, it supports long‑distance transmission up to 1200 meters. Differential transmission effectively suppresses common‑mode noise in industrial environments and delivers prominent advantages of high reliability, low cost and simple wiring.

Summary

XBLW MAX485 is a high‑performance, high‑reliability RS485 transceiver combining fast communication rate and low‑power characteristics. It offers outstanding ESD‑protection capability and comprehensive fault‑protection mechanisms, and is widely adopted for various industrial and communication applications. Its wide supply‑voltage range plus multiple package options bring greater flexibility and convenience for system design, enabling stable and efficient communication links.