LTM2885 6500V Isolated RMS RS485/RS422 Module Transceiver + Power FEATURES DESCRIPTION n RS485/RS422 Transceiver: 6500V for 1 Minute The LTM 2885 is a complete galvanically isolated RMS n Reinforced Insulation full-duplex RS485/RS422 Module (micromodule) n Isolated DC Power: 5V at 200mA transceiver. No external components are required. A n single supply powers both sides of the interface through No External Components Required n an integrated, isolated, low noise, efficient 5V output 20Mbps or Low EMI 250kbps Data Rate n DC/DC converter. High ESD: 15kV HBM on Transceiver Interface n High Common Mode Transient Immunity: 50kV/s Coupled inductors and an isolation power transformer n Integrated Selectable 120 Termination provide 6500V of isolation between the line transceiver RMS n Extended Creepage and Clearance ~14.6mm and the logic interface. This device is ideal for systems n 1.62V to 5.5V Logic Supply Pin for Flexible where the ground loop is broken allowing for large common Digital Interface mode voltage variation. Uninterrupted communication is n Maximum Continuous Working Voltage: 690V RMS guaranteed for common mode transients up to 50kV/s. n High Input Impedance Failsafe RS485 Receiver Maximum data rates are 20Mbps or 250kbps in slew n Current Limited Drivers and Thermal Shutdown limited mode. Transmit data, DI, and receive data, RO, are n Compatible with TIA/EIA-485-A and PROFIBUS implemented with event driven low jitter processing. The n High Impedance Output During Internal Fault Condition receiver has a one-eighth unit load supporting up to 256 n Low Current Shutdown Mode (< 10A) nodes per bus. A logic supply pin allows easy interfacing n General Purpose CMOS Isolated Channel with different logic levels from 1.62V to 5.5V, independent n 22mm 9mm 5.16mm Surface Mount BGA Package of the main supply. Enhanced ESD protection allows this part to withstand up APPLICATIONS to 15kV (human body model) on the transceiver interface n Isolated RS485/RS422 Interface pins to isolated supplies and 25kV through the isolation n Industrial Networks barrier to logic supplies without latch-up or damage. n Breaking RS485 Ground Loops L, LT, LTC, LTM, Linear Technology, the Linear logo and Module are registered trademarks of n Analog Devices, Inc. All other trademarks are the property of their respective owners. Isolated PROFIBUS-DP Networks TYPICAL APPLICATION Isolated Half-Duplex RS485 Module Transceiver LTM2885 Operating Through 100kV/s CM Transients 5V V CC LTM2885 DI V 5V CC2 5V/DIV PWR OUT V A RO L 5V/DIV RO B RE TWISTED-PAIR MULTIPLE SWEEPS OF COMMON MODE CABLE TE TRANSIENTS DE Y DI 300V/DIV Z 2885 TA01b 20ns/DIV GND GND2 2885 TA01a 2885fa 1 For more information www.linear.com/LTM2885 ISOLATION BARRIERLTM2885 ABSOLUTE MAXIMUM RATINGS (Note 1) Signal Voltages SLO, V to GND .................................................. 0.3V to 6V D to GND2 ....................................0.3V to V +0.3V CC IN CC2 V to GND2 ............................................... 0.3V to 6V Operating Temperature Range (Note 4) CC2 V to GND .................................................... 0.3V to 6V LTM2885C ............................................... 0C to 70C L Interface Voltages LTM2885I ............................................40C to 85C (A, B, Y, Z) to GND2 ........................ V 15V to 15V LTM2885H ......................................... 40C to 105C CC2 (A-B) with Terminator Enabled ..............................6V Maximum Internal Operating Temperature ............ 125C Signal Voltages ON, RO, DI, DE, Storage Temperature Range .................. 55C to 125C RE, TE, D to GND ......................... 0.3V to V +0.3V Peak Body Reflow Temperature ............................ 245C OUT L PIN CONFIGURATION TOP VIEW 7 ON 6 V V V L CC CC2 5 RO A 4 RE B 3 DE Z 2 DI GND GND2 Y 1 TE DOUT NC NC DIN SLO A B C D E F G H J K L M N P R S T BGA PACKAGE 42-PIN (22mm 9mm 5.2mm) T = 125C, = 35C/W, = 23.9C/W, = 29.6C/W, = 22.7C/W JMAX JA JC(BOTTOM) JC(TOP) JBOARD VALUES DETERMINED PER JESD51-9, WEIGHT = 1.9g ORDER INFORMATION