MAX13487E

PRODUCTION

Half-Duplex RS-485/RS-422-Compatible Transceiver with AutoDirection Control

Eliminate an Isolated Control Channel with AutoDirection

Data Sheet (Rev. 3) Product Selection Table

Part Models: 2
1ku List Price: Starting From $2.40

Viewing:

Overview

AutoDirection Saves Space and BOM Cost
- AutoDirection Enables Driver Automatically on Transmission, Eliminating an Opto or Other Discrete Means of Isolation
- 8-Pin SO Package
Robust Protection Features for Telecom, Industrial, and Isolated Applications
- Hot-Swap Capability to Eliminate False Transitions on the Bus During Power-Up or Live Insertion
- Extended ESD Protection for RS-485 I/O Pins (±15kV Human Body Model)
Options Optimize Designs for Speed or Errorless Data Transmission
- Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission (MAX13487E)
- High-Speed Version (MAX13488E) Allows for Transmission Speeds Up to 16Mbps
1/4-Unit Load, Allowing Up to 128 Transceivers on the Bus

The MAX13487E/MAX13488E +5V, half-duplex, ±15kV ESD-protected RS-485/RS-422-compatible transceivers feature one driver and one receiver. The MAX13487E/MAX13488E include a hot-swap capability to eliminate false transitions on the bus during power-up or live insertion.

The MAX13487E/MAX13488E feature Maxim's proprietary AutoDirection control. This architecture makes the devices ideal for applications, such as isolated RS-485 ports, where the driver input is used in conjunction with the driver-enable signal to drive the differential bus. The MAX13487E features reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free transmission up to 500kbps. The MAX13488E driver slew rate is not limited, allowing transmit speeds up to 16Mbps.

The MAX13487E/MAX13488E feature a 1/4-unit load receiver input impedance, allowing up to 128 transceivers on the bus. These devices are intended for half-duplex communications. All driver outputs are protected to ±15kV ESD using the Human Body Model. The MAX13487E/MAX13488E are available in an 8-pin SO package. The devices operate over the extended -40°C to +85°C temperature range.

Design Solution: Simplify Your Industrial Interface by Eliminating RS-485 Control Lines ›

Applications

Automated HVAC Systems
Industrial Controls
Industrial Motor Drives
Isolated RS-485 Interfaces
Utility Meters

Part Models: 2
1ku List Price: Starting From $2.40

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX13487EESA+	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX13487EESA+T	Small-Outline IC, Narrow (0.15in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

May 22, 2018 - 1702N ASSEMBLY
		pcn_1702n
MAX13487EESA+	PRODUCTION
MAX13487EESA+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Evaluation Kits

Evaluation Kit for the MAX13487E and MAX13488E

Buy Now View Details

Features and Benefits

Demonstrates MAX13487E AutoDirection Feature
Designed for 2500V_RMS Isolation
1/4 RS-485 Unit Loading
500kbps Half-Duplex RS-485 Communication
+5V DC Input Range
Isolated +5V Output
Center-Tapped Full-Wave Rectifier Output
420kHz Switching Frequency
Output Current Limit and Thermal Shutdown
Low-Cost Integrated-FET H-Bridge Design
Also Evaluates MAX13488E (After IC Replacement)
Fully Assembled and Tested

Product Details

The MAX13487E evaluation kit (EV kit) is a fully assembled and tested PCB that contains a half-duplex RS-485 AutoDirection-controlled transceiver with ESD protection. The EV kit circuit features a differential driver and receiver. The circuit’s receiver is a 1/4-unit load for the RS-485 bus and can communicate up to 500kbps. The MAX13487E AutoDirection and reduced-driver slew-rate features are demonstrated on the EV kit circuit. The EV kit can also be used to evaluate the MAX13488E IC, which can communicate up to 16Mbps.

Power for the transceiver circuit is provided by a MAX256 H-bridge DC/DC converter, which powers the isolated section of the MAX13487E RS-485 circuit. Input-ripple current and radiated noise are minimized by using an H-bridge design. The isolated H-bridge DC-DC converter operates at 420kHz. Input power to the EV kit circuit can be supplied by a +5V DC source.

The DC-DC converter circuit uses a surface-mount transformer to provide galvanic isolation and a full-wave rectifier, and provides a regulated +5V to the MAX13487E. A MAX1659 linear low dropout (LDO) regulator provides the regulated output and up to 300mA of current. The output current limit and thermal shutdown provide for a robust isolated RS-485 transceiver circuit and power supply. The transceiver and power circuits and PCB are designed for 2500V_RMS isolation.

Applications