LTM2881 - Completed Isolated RS485/RS422 …

1 LTM288112881fiFor more information applicaTionDescripTionComplete Isolated RS485/RS422 Module Transceiver + power The LT M 2881 is a complete galvanically Isolated full-du-plex RS485/RS422 Module (micromodule) transceiver. No external components are required. A single supply powers both sides of the interface through an integrated, Isolated , low noise, efficient 5V output DC/DC inductors and an isolation power transformer provide 2500 VRMS of isolation between the line transceiver and the logic interface. This device is ideal for systems where the ground loop is broken allowing for large com-mon mode voltage variation.

2 Uninterrupted communica-tion is guaranteed for common mode transients greater than 30kV/ data rates are 20 Mbps or 250kbps in slew limited mode. Transmit data, DI and receive data, RO, are implemented with event driven low jitter processing. The receiver has a one-eighth unit load supporting up to 256 nodes per bus. A logic supply pin allows easy interfacing with different logic levels from to , independent of the main ESD protection allows this part to withstand up to 15kV (human body model) on the transceiver interface pins to Isolated supplies and 10kV through the isolation barrier to logic supplies without latch-up or , LT, LTC, LTM, Linear Technology, the Linear logo and Module are registered trademarks of Linear Technology Corporation.

3 All other trademarks are the property of their respective Half-Duplex RS485 Module Transceiver FeaTuresapplicaTions nRS485/RS422 Transceiver: 2500 VRMS for 1 Minute nUL-CSA Recognized File #E151738 nCSA Component Acceptance Notice 5A nIsolated DC power : 5V at Up to 200mA nNo External Components Required n20 Mbps or Low EMI 250kbps Data Rate nHigh ESD: 15kV HBM on Transceiver Interface nHigh Common Mode Transient Immunity: 30kV/ s nIntegrated Selectable 120 Termination ( LTM2881 -3) or ( LTM2881 -5) Operation to Logic Supply Pin for Flexible Digital Interface nMaximum Continuous Working Voltage.

4 560 VPEAK nHigh Input Impedance Failsafe RS485 Receiver nCurrent Limited Drivers and Thermal Shutdown nCompatible with TIA/EIA-485-A and PROFIBUS nHigh Impedance Output During Internal Fault Condition nLow Current Shutdown Mode (< 10 A) nGeneral Purpose CMOS Isolated Channel n15mm BGA and LGA Packages nIsolated RS485/RS422 Interface nIndustrial Networks nBreaking RS485 Ground Loops nIsolated PROFIBUS-DP NetworksLTM2881 Operating Through 35kV/ s CM Transients 2881 TA01 TWISTED-PAIRCABLEAVAILABLE CURRENT:150mA ( LTM2881 -5)100mA ( LTM2881 -3) ( LTM2881 -3)5V ( LTM2881 -5) LTM2881 BYZPWRISOLATION BARRIER2881 TA01a500V/DIV50ns/DIV1V/DIV1V/DIVDIMULTI PLE SWEEPSOF COMMON MODETRANSIENTSROLTM288122881fiFor more information conFiguraTionabsoluTe MaxiMuM raTingsVCC to GND.

5 To 6 VVCC2 to GND2 .. to 6 VVL to GND .. to 6 VInterface Voltages (A, B, Y, Z) to GND2 ..VCC2 15V to 15V (A-B) with Terminator Enabled .. 6 VSignal Voltages ON, RO, DI, DE, RE, TE, DOUT to GND .. to VL + Voltages SLO, DIN to GND2 .. to VCC2 + Temperature Range LTM2881C ..0 C to 70 C LTM2881I .. 40 C to 85 C LTM2881H .. 40 C to 105 C LTM2881MP .. 55 C to 105 C Maximum Internal Operating Temperature ..125 CStorage Temperature Range .. 55 C to 150 CPeak Package Body Reflow Temperature ..245 C(Note 1)BGA PACKAGE32-PIN (15mm )TJMAX = 125 C, JA = C/W, JCTOP = C/W, JCBOTTOM = C/W, JB = C/W,WEIGHT = 1gLGA PACKAGE32-PIN (15mm )TJMAX = 125 C, JA = C/W, JCTOP = C/W, JCBOTTOM = C/W, JB = C/W,WEIGHT = 1gTOP VIEWSLODINRO VLONREDEDITEDOUT1 ABCDEFGHJKL2345678 VCC2 ZGND2 GNDBAYVCCLTM288132881fiFor more information inForMaTionPART NUMBERINPUT VOLTAGEPAD OR BALL FINISHPART MARKINGPACKAGE TYPEMSL RATINGTEMPERATURE RANGEDEVICEFINISH CODELTM2881CY-3#PBF3V to (RoHS)

6 LTM2881Y-3e1 BGA30 C to 70 C LTM2881IY-3#PBF 40 C to 85 C LTM2881HY-3#PBF 40 C to 105 C LTM2881HY-3 SnPb (63/37)e0 40 C to 105 C LTM2881 MPY-3#PBFSAC305 (RoHS)e1 55 C to 105 C LTM2881 MPY-3 SnPb (63/37)e0 55 C to 105 C LTM2881CY-5# to (RoHS)LTM2881Y-5e10 C to 70 C LTM2881IY-5#PBF 40 C to 85 C LTM2881HY-5#PBF 40 C to 105 C LTM2881HY-5 SnPb (63/37)e0 40 C to 105 C LTM2881 MPY-5#PBFSAC305 (RoHS)e1 55 C to 105 C LTM2881 MPY-5 SnPb (63/37)e0 55 C to 105 C LTM2881CV-3#PBF3V to (RoHS)LTM2881V-3e4 LGA0 C to 70 C LTM2881IV-3#PBF 40 C to 85 C LTM2881HV-3#PBF 40 C to 105 C LTM2881CV-5# to C to 70 C LTM2881IV-5#PBF 40 C to 85 C LTM2881HV-5#PBF 40 C to 105 C Device temperature grade is indicated by a label on the shipping container.

7 Pad or ball finish code is per IPC/JEDEC J-STD-609. Terminal Finish Part Marking: This product is not recommended for second side reflow. For more information, go to: Recommended BGA and LGA PCB Assembly and Manufacturing Procedures: LGA and BGA Package and Tray Drawings: This product is moisture sensitive. For more information, go to: #orderinfoLTM288142881fiFor more information characTerisTicsSYMBOLPARAMETERCONDITIONS MINTYPMAXUNITSP ower SupplyVCCVCC Supply VoltageLTM2881-3 LTM2881 -5l VVLVL Supply Supply Current in Off ModeON = 0Vl010 AICCSVCC Supply Current in On ModeLTM2881-3 DE = 0V, RE = VL, No Load LTM2881 -5 DE = 0V, RE = VL, No Loadl l20 1530 25mA mAVCC2 Regulated VCC2 Output Voltage, LoadedLTM2881-3 DE = 0V, RE = VL, ILOAD = 100mA LTM2881 -5 DE = 0V, RE = VL, ILOAD = 150mA LTM2881 -3, H/MP-Grade, ILOAD = 90mAl l V VVCC2 NOLOADR egulated VCC2 Output Voltage, No LoadDE = 0V, RE = VL.

8 No = 100mA, LTM2881 -5 (Note 2)62%ICC2 SVCC2 Short-Circuit CurrentDE = 0V, RE = VL, VCC2 = 0V200mADriver|VOD|Differential Driver Output VoltageR = (Figure 1) R = 27 (RS485) (Figure 1) R = 50 (RS422) (Figure 1)l l l VCC2 VCC2V V V |VOD|Difference in Magnitude of Driver Differential Output Voltage for Complementary Output StatesR = 27 or R = 50 (Figure 1) Common Mode Output VoltageR = 27 or R = 50 (Figure 1)l3V |VOC|Difference in Magnitude of Driver Common Mode Output Voltage for Complementary Output StatesR = 27 or R = 50 (Figure 1) Three-State (High Impedance) Output Current on Y and ZDE = 0V, (Y or Z) = 7V, +12V DE = 0V, (Y or Z) = 7V, +12V, H/MP-Gradel l 10 50 A AIOSDM aximum Driver Short-Circuit Current 7V (Y or Z) 12V (Figure 2)l 250250mAReceiverRINR eceiver Input ResistanceRE = 0V or VL, VIN = 7V, 3V, 3V, 7V, 12V (Figure 3) RE = 0V or VL, VIN = 7V, 3V, 3V, 7V, 12V (Figure 3), H/MP-Gradel l96 48125 125k k RTER eceiver Termination Resistance EnabledTE = VL, VAB = 2V, VB = 7V, 0V, 10V (Figure 8)l108120156 IINR eceiver Input Current (A, B)ON = 0V VCC2 = 0V or 5V, VIN = 12V (Figure 3)

9 ON = 0V VCC2 = 0V or 5V, VIN = 12V (Figure 3), H/MP-Gradel l125 250 AON = 0V VCC2 = 0V or 5V, VIN = 7V (Figure 3) ON = 0V VCC2 = 0V or 5V, VIN = 7V (Figure 3), H/MP-Gradel l 100 145 AVTHR eceiver Differential Input Threshold Voltage (A-B) 7V B 12Vl VTHR eceiver Input Failsafe Hysteresis B = 0V25mVReceiver Input Failsafe Threshold B = 0V The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C.

10 LTM2881 -3 VCC = , LTM2881 -5 VCC = , VL = , GND = GND2 = 0V, ON = VL unless otherwise more information Input Low VL Logic Input High VoltageDIN SLO DI, TE, DE, ON, RE: VL VL < l l VCC2 2 VL VLV V V VIINLL ogic Input Currentl0 1 AVHYSL ogic Input Hysteresis(Note 2)150mVVOHO utput High VoltageOutput High, ILOAD = 4mA (Sourcing), VL 3V Output High, ILOAD = 1mA (Sourcing), VL < 3Vl lVL VL VVOLO utput Low VoltageOutput Low, ILOAD = 4mA (Sinking), VL 3V Output High, ILOAD = 1mA (Sinking), VL < 3Vl VIOZRT hree-State (High Impedance) Output Current on RORE = VL, 0V RO VLl 1 AIOSRS hort-Circuit Current0V (RO or DOUT)