LTM2881 Complete Isolated RS485/RS422 Module Transceiver + Power Fea T Descrip T n RS485/RS422 Transceiver: 2500V for 1 Minute The LTM 2881 is a complete galvanically isolated full-du- RMS n UL-CSA Recognized File E151738 plex RS485/RS422 Module (micromodule) transceiver. n CSA Component Acceptance Notice 5A No external components are required. A single supply n Isolated DC Power: 5V at Up to 200mA powers both sides of the interface through an integrated, n No External Components Required isolated, low noise, efficient 5V output DC/DC converter. n 20Mbps or Low EMI 250kbps Data Rate Coupled inductors and an isolation power transformer n High ESD: 15kV HBM on Transceiver Interface provide 2500V of isolation between the line transceiver RMS n High Common Mode Transient Immunity: 30kV/s and the logic interface. This device is ideal for systems n Integrated Selectable 120 Termination where the ground loop is broken allowing for large com- n 3.3V (LTM2881-3) or 5.0V (LTM2881-5) Operation mon mode voltage variation. Uninterrupted communica- n 1.62V to 5.5V Logic Supply Pin for Flexible Digital Interface tion is guaranteed for common mode transients greater n Maximum Continuous Working Voltage: 560V PEAK than 30kV/s. n High Input Impedance Failsafe RS485 Receiver n Maximum data rates are 20Mbps or 250kbps in slew Current Limited Drivers and Thermal Shutdown n limited mode. Transmit data, DI and receive data, RO, are Compatible with TIA/EIA-485-A and PROFIBUS n implemented with event driven low jitter processing. The High Impedance Output During Internal Fault Condition n receiver has a one-eighth unit load supporting up to 256 Low Current Shutdown Mode (< 10A) n nodes per bus. A logic supply pin allows easy interfacing General Purpose CMOS Isolated Channel n with different logic levels from 1.62V to 5.5V, independent 15mm 11.25mm BGA and LGA Packages of the main supply. a T Enhanced ESD protection allows this part to withstand up n to 15kV (human body model) on the transceiver interface Isolated RS485/RS422 Interface n pins to isolated supplies and 10kV through the isolation Industrial Networks n barrier to logic supplies without latch-up or damage. Breaking RS485 Ground Loops n L, LT, LTC, LTM, Linear Technology, the Linear logo and Module are registered trademarks of Isolated PROFIBUS-DP Networks Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T Isolated Half-Duplex RS485 Module Transceiver LTM2881 Operating Through 35kV/s CM Transients 3.3V (LTM2881-3) 5V (LTM2881-5) MULTIPLE SWEEPS OF COMMON MODE TRANSIENTS V CC LTM2881 AVAILABLE CURRENT: V 5V 500V/DIV CC2 PWR 150mA (LTM2881-5) V A L 100mA (LTM2881-3) RO DI B RE RO TWISTED-PAIR 1V/DIV CABLE TE DE 1V/DIV Y DI 2881 TA01a 50ns/DIV Z GND GND2 2881 TA01 2881fi 1 For more information www.linear.com/LTM2881 ISOLATION BARRIER ion pplica ions pplica ion uresLTM2881 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW V to GND .................................................. 0.3V to 6V CC 1 2 3 4 5 6 7 8 V to GND2 ............................................... 0.3V to 6V CC2 D TE DI DE RE RO V ON OUT L V to GND .................................................... 0.3V to 6V L A Interface Voltages B (A, B, Y, Z) to GND2 ........................ V 15V to 15V CC2 GND V C CC (A-B) with Terminator Enabled ..............................6V D Signal Voltages ON, RO, DI, DE, E RE, TE, D to GND ......................... 0.3V to V +0.3V F OUT L Signal Voltages SLO, G D to GND2 ....................................0.3V to V +0.3V H IN CC2 J Operating Temperature Range GND2 K LTM2881C ............................................... 0C to 70C L LTM2881I .............................................40C to 85C D SLO Y Z B A V IN CC2 LTM2881H ......................................... 40C to 105C BGA PACKAGE LGA PACKAGE LTM2881MP ...................................... 55C to 105C 32-PIN (15mm 11.25mm 3.42mm) 32-PIN (15mm 11.25mm 2.8mm) T = 125C, T = 125C, Maximum Internal Operating Temperature ....... 125C JMAX JMAX = 32.2C/W, = 31.1C/W, JA JA Storage Temperature Range ..................55C to 150C = 27.2C/W, = 27.3C/W, JCTOP JCTOP = 20.9C/W, = 19.5C/W, JCBOTTOM JCBOTTOM Peak Package Body Reflow Temperature .............. 245C = 26.4C/W, = 25.1C/W, JB JB WEIGHT = 1g WEIGHT = 1g 2881fi 2 For more information www.linear.com/LTM2881 ion igura on ings bsolu