NM485D6S5MC www.murata-ps.com Isolated RS485 Driver DC-DC 6V 5V 6V 5V regulated 5V Regulator 0V 0V Isolated DC-DC Power Supply 0V -6V -6V 3.3V Vcc Regulator 0V Isolated 485 Transceiver input lines output lines FEATURES output lines input lines n Patent pending n ANSI/AAMI ES60601-1, 2 MOOP/1 MOPP SELECTION GUIDE recognised 1 Order Code NM485D6S5MC n UL60950 recognised for 250Vrms reinforced MODULE CHARACTERISTICS insulation DRIVER n SMD compatible Parameter Test conditions Min. Typ. Max. Units Symbol n +6V , -6V unregulated and +5V regulated Differential Output Loaded RL = 100Ω (RS-422), See Figure 1 2.0 3.6 V VOD isolated outputs Voltages Loaded RL = 54Ω (RS-485) 1.5 3.6 Short Circuit Output 250 mA IOS n Differential driver and receiver Current Complementary n 500kbps data rate RL = 54Ω or 100Ω, see figure 1 0.2 V Δ |VOD| Output States n Complies with ANSI TIA/EIA RS-485-A-1998 Common-mode RL = 54Ω or 100Ω, see figure 1 3.0 V VOC and ISO 8482: 1987(E) Output Voltages Complementary n Industrial temperature range -40°C to RL = 54Ω or 100Ω, see figure 1 0.2 V Δ |VOC| Output States +85°C 0.25 x Input Threshold Low V VIL Vcc n Tested at 3000Vac rms ‘Hi Pot Test’ Input Threshold High 0.7 x V VIH Input Current -10 +0.01 +10 µA II PRODUCT OVERVIEW 2 RECEIVER The NM485D6S5MC is a low power electrically Parameter Test conditions Min. Typ. Max. Units Symbol isolated differential driver and receiver designed Differential Input for bi-directional data communication or multipoint -7V < VCM < +12V -200 -125 -30 mV VTH Threshold Voltages bus transmission. The device combines a tri-state Input Voltages differential line driver and a differential input line VOC = 0V 15 mV VHYS Hysteresis receiver. The driver and receiver have active high Input Current (A, B) -100 +125 µA II and active low enables, respectively, which can be Line Input Resistance -7V < VCM < +12V 96 kΩ RIN connected together to function as direction control. Tristate Leakage ±1 µA IOZR No external components are needed as a single Current 5V supply powers all functions either side of the Output Voltage Low 0.2 0.4 V VOLRxD isolation boundary. NM485D655MC also provides Vcc - Vcc - Output Voltage High V VOHRxD 0.3 0.2 a regulated 5V, unregulated 6V and -6V isolated Short-Circuit Current 100 mA supply’s for system use. Common-Mode VCM = 1 kV, transient magnitude = 800V 25 KV/µS Transient Immunity ABSOLUTE MAXIMUM RATINGS Supply voltage VCC with respect to pin 11 6V Bus Terminal Voltages -9V to +14V Logic Terminal Voltage -0.5V to Vcc +0.5V Data transmission rate 500Kbps 1. Components are supplied in tape and reel packaging, please refer to tape and reel specification section. Orderable part numbers are NM485D6S5MC-R7 (80 pieces per reel), or NM485D6S5MC-R13 (350 pieces per reel). 2. VCM is the common-mode potential difference between the logic and bus sides. The transient magnitude is the range over which the For full details go to common mode is slewed. The common-mode voltage slew rates apply to both rising and falling common-mode voltage edges. www.murata-ps.com/rohs All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified. www.murata-ps.com/support KDC_NM485D6S5MC.B02 age 1 of 11 Isolation NM485D6S5MC Isolated RS485 Driver DC-DC TIMING SPECIFICATIONS Parameter Test conditions Min. Typ. Max. Units Symbol Driver Propagation Delay RL = 54Ω, CL1 = CL2 = 100 pF see figure 2 & 6 250 700 ns tDPLH, tDPHL Differential Driver Output Skew RL = 54Ω, CL1 = CL2 = 100 pF see figure 2 & 6 100 ns TDSKEW Rise Time/Fall Time RL = 54Ω, CL1 = CL2 = 100 pF see figure 2 & 6 200 450 1100 ns TDR, TDF Enable Time RL = 110Ω, CL1 = 50 pF see figure 4 & 7 1.5 µs TZL, TZH Disable Time RL = 110Ω, CL1 = 50 pF see figure 4 & 7 200 ns TLZ, THZ Receiver Propagation Delay CL1 = 15 pF see figure 3 & 8 200 ns TPLH, TTPHL Pulse Width Distortion CL1 = 15 pF see figure 3 & 8 30 ns TPWD Enable Time RL = 1kΩ, CL1 = 15 pF see figure 5 & 9 13 ns TZL, TZH Disable Time RL = 1kΩ, CL1 = 15 pF see figure 5 & 9 13 ns TLZ, THZ FIGURE 1 FIGURE 2 FIGURE 3 DRIVER TEST CIRCUIT DRIVER TEST CIRCUIT RECEIVER TEST CIRCUIT (For output voltage levels) (For timing characteristics) (For timing characteristics) A RL CL1 2 vout Y VOD RL CL B Z RL CL2 2 FIGURE 4 FIGURE 5 FIGURE 6 DATA ENABLE TEST CIRCUIT READ ENABLE TEST CIRCUIT DRIVER TIMING (For signal propagation) VDD1 VDD1/2 VDD1/2 +1.5v VOUT VCC 0V VCC S1 tDPLH tDPLH Y RL -1.5v RL 0V or 3V S1 S2 Z RE S2 CL CL 1/2VO Z vout VO DE Y RE IN +VO 90% POINT VDIFF=V(Y)-V(Z) 90% POINT VDIFF 10% POINT 10% POINT -VO tDR tDF FIGURE 7 FIGURE 8 FIGURE 9 DATA ENABLE TIMING SPECIFICATION RECEIVER TIMING READ ENABLE TIMING SPECIFICATION vDD1 vDD1 RE 0.5VDD1 0.5VDD1 DE 0.5VDD1 0.5VDD1 0V A, B 0V 0V 0V tZL tLZ tZL tLZ tPLH tPHL RxD 1.5V Y, Z 2.3V VOH VOL +0.5V VOL RXD VOL +0.5V 1.5V 1.5V VOL tZH tHZ VOL VOH tZH tHZ VOH -0.5V VOH RxD VOH -0.5V 1.5V Y, Z 2.3V 0V 0V 0V www.murata-ps.com/support KDC_NM485D6S5MC.B02 age 2 of 11 NM485D6S5MC Isolated RS485 Driver DC-DC DC-DC CHARACTERISTICS INPUT CHARACTERISTICS Parameter Test conditions Min. Typ. Max. Units Voltage range Continuous operation 4.5 5 5.5 V Input reflected ripple current 5V Input 6 mA pk-pk OUTPUT CHARACTERISTICS Parameter Test conditions Min. Typ. Max. Units 5V Output regulated (0mA to 80mA) 4.92 5 5.08 Output voltage spec +6V Unregulated (16mA to 160mA) 5.4 6 6.6 V (The maximum current share across all outputs is 160mA.) -6V Unregulated (16mA to 160mA) -6.6 -6 -5.4 Line regulation 1.1 1.2 %% Load regulation 5 8 % Ripple and noise 25 50 mV 5V Regulated 0.4 Power W Total available power across all outputs 0.8 TEMPERATURE CHARACTERISTICS Parameter Test conditions Min. Typ. Max. Units Operation See derating graph -40 85 o Storage -50 125 C Product temperature rise above ambient Measured in the isolation barrier 20 30 ISOLATION CHARACTERISTICS Parameter Test conditions Min. Typ. Max. Units Production tested for 1 Second 3000 VACrms Isolation test voltage Qualification tested for 1 minute 3000 VACrms Isolation capacitance 5 pF Resistance Viso = 1kVDC 10 GΩ GENERAL CHARACTERISTICS Parameter Test conditions Min. Typ. Max. Units MIL-HDBK-217 FN2 800 kHrs MTTF - nominal input voltage at full load Telcordia SR-332 10000 kHrs Switching frequency 95 kHz www.murata-ps.com/support KDC_NM485D6S5MC.B02 age 3 of 11 NM485D6S5MC Isolated RS485 Driver DC-DC TECHNICAL NOTES ISOLATION VOLTAGE ‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage, applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. Murata Power Solutions NM485D6S5MC is 100% production tested at 3kVAC rms for 1 second and have been qualification tested at 3kVAC rms for 1 minute. The NM485D6S5MC has been recognised by Underwriters Laboratory to 250Vrms reinforced insulation. REPEATED HIGH-VOLTAGE ISOLATION TESTING It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials, construction and environment. The NM485D6S5MC has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enamelled wire. While parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage. This consideration equally applies to agency recognised parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further insulation system of physical spacing or barriers. SAFETY APPROVAL ANSI/AAMI ES60601-1 The NM485D6S5MC has been recognised to ANSI/AAMI ES60601-1 and provides 1 MOPP (Means Of Patient Protection) and 2 MOOP (Means Of Operator Protection) based upon a working voltage of 250Vrms max, between Primary and Secondary. UL 60950 The NM485D6S5MC has been recognised by Underwriters Laboratory (UL) to UL 60950 for reinforced insulation to a working voltage of 250Vrms. Creepage is 5mm and clearance is 4mm. FUSING The NM485D6S5MC is not internally fused so to meet the requirements of UL an anti-surge input line fuse should always be used with ratings as defined below. NM485D6S5MC - 1A All fuses should be UL recognised and rated to at least the maximum allowable DC input voltage. RoHS COMPLIANCE, MSL AND PSL INFORMATION The NM485D6S5MC is compatible with Pb-Free soldering systems and is also backward compatible with Sn/Pb soldering systems. The NM485D6S5MC has a process, moisture, and reflow sensitivity classification of MSL2 PSL R7F as defined in J-STD-020 and J-STD-075. This translates to: MSL2 = 1 year floor life, PSL R7F = Peak reflow temperature 245°C with a limitation on the time above liquidus (217°C) which for this series is 90sec max. The pin termination finish on this product series is Gold with Nickel Pre-plate. www.murata-ps.com/support KDC_NM485D6S5MC.B02 age 4 of 11 NM485D6S5MC Isolated RS485 Driver DC-DC APPLICATION NOTES The increased use of balanced data transmission lines, (distributing data to several system components and peripherals over relatively long lines) has brought about the need for multiple driver/receiver combinations on a single twisted pair line. This resulted in an upgraded version of EIA RS-422, named EIA-485. EIA-485 takes into account EIA RS-422 requirements for balanced line data transmission, and allows for multiple drivers and receivers. The NM485D6S5MC is a low power isolated differential interface providing EIA-485 compatibility. The use of a differential communications interface such as the NM485D6S5MC allows data transmission at high rates and over long distances to be accomplished. This is because effects of external noise sources and cross talk are much less pronounced on the data signal. Any external noise source coupling onto the differential lines will appear as an extra common mode voltage which the receiver is insensitive to. The difference between the signal levels on the two lines will therefore remain the same. Similarly a change in the local ground potential at one end of the line will appear as just another change in the common mode voltage level of the signals. Twisted pair cable is commonly used for differential communications since its twisted nature tends to cause cancellation of the magnetic fields generated by the current flowing through each wire, thus reducing the effective inductance of the pair. Computer and industrial serial interfacing are areas where noise can seriously affect the integrity of data transfer, and a proven route to improve noise performance for any interface system is galvanic isolation. Galvanic isolation removes the ground loop currents from data lines and hence the impressed noise voltage which affects the signal is also eliminated. The isolation feature of the NM485D6S5MC also means that common mode noise effects are removed and many forms of radiated noise are reduced to negligible limits. NM485 Truth table for NM485 functionality 5Vin +5V DE RE RXD Y Z 0V Isolated +6V Power -6V 0V supply O O ≈A Hi Z Hi Z O I Hi Z Hi Z Hi Z A RxD R B RE I O ≈A ≈Txd ≈Txd DE Z TxD D Y I I Hi Z ≈Txd ≈Txd Hi Z = High impedance tri state Figure 10 demonstrates how the differential lines of the NM485D6S5MC can be connected to form a transceiver. Data direction is controlled by the driver enable and receiver enable pins. This means the device can receive when the receiver enable is low and transmit when the driver enable is high. As the driver is active high, to reduce the power dis- sipation even further, it is advisable to disable the driver when not transmitting data. Configuring the NM485D6S5MC as a transceiver The NM485D6S5MC is configured as a transceiver simply by connecting B to Z, A to Y and D ENABLE to R ENABLE. The system then writes data to the bus when XEN1 is high ( with read disabled) and reads data from bus when XEN1 is low ( with write disabled). NM485D6S5MC FIGURE 10 MC68195 +5Vin A 11 1 VCC B 10 RDATA1 28 3 RxD XEN1 27 5 D ENABLE XDATA1 25 6 TxD 4 R ENABLE Z 8 2 GND Y 7 ISO GND OV 12 Isolation Barrier Minimum load The minimum load to meet datasheet specification is 10% of the full rated load across the specified input voltage range. Lower than 10% minimum loading will result in an increase in output voltage, which may rise to typically double the specified output voltage if the output load falls to less than 5%. www.murata-ps.com/support KDC_NM485D6S5MC.B02 age 5 of 11 NM485D6S5MC Isolated RS485 Driver DC-DC APPLICATION NOTES (Continued) Short Circuit Performance The NM485D6S5MC offers short circuit protection at low ambient temperatures from -40°C to the temperatures shown in the below graph, when the output power lines are shorted together or to GND. For datalines the device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention causes excessive power dissipation. 1000 100 Nominal Vin High Vin 10 1 25 35 45 55 65 75 85 Temperature (˚C) Capacitive Loading & Start Up Typical start up times for this series, with a typical input voltage rise time of 2.2μs and output capacitance of 10μF, are shown in the table below. The product series will start into a capacitance of 47μF with an increased start time of 4.6ms Typical Start-Up Wave Form Start-up time ms NM485D6S5MC 1.6 www.murata-ps.com/support KDC_NM485D6S5MC.B02 age 6 of 11 Time (seconds) NM485D6S5MC Isolated RS485 Driver DC-DC APPLICATION NOTES (continued) Typical applications Figure 11 and Figure 12 show typical applications of half-duplex and full-duplex RS-485 network configurations. Up to 256 transceivers can be connected to the RS-485 bus. To minimize reflections, the line must be terminated at the receiving end in its characteristic impedance and stub lengths off the main line must be kept as short as possible. For half-duplex operation, this means that both ends of the line must be terminated as either end can be the receiving end. The NM485D6S5MC series offers a triple supply (+5V, +6V, -6V) which can be used to power system circuitry. NM485 NM485 5Vin +5V +5V 5Vin Isolated Isolated 0V +6V +6V 0V Power -6V Power -6V 0V 0V supply supply A A R RxD RxD R B B RE RE R R T T DE DE Z Z TxD D D TxD Y Y A B Y Z A B Z Y R D R D RxD RE DE TxD RxD RE DE TxD Figure 11. Typical Half-Duplex RS-485 Network NM485 NM485 5Vin +5V +5V 5Vin Isolated Isolated 0V +6V +6V 0V Power Power -6V -6V 0V 0V supply supply A Y RxD R TxD R D B T Z DE RE DE RE Z B TxD D RxD RT R Y A A B Z Y A B Z Y R R D D RxD DE TxD RxD DE TxD RE RE Figure 12. Typical Full-Duplex RS-485 Network www.murata-ps.com/support KDC_NM485D6S5MC.B02 age 7 of 11 NM485 +5V 5Vin Isolated +6V 0V NM485 Power -6V supply 0V 5Vin +5V Isolated 0V +6V Power -6V supply 0V NM485 NM485 5Vin +5V Isolated 0V +6V 5Vin +5V Power Isolated -6V 0V +6V supply Power 0V -6V supply 0V NM485D6S5MC Isolated RS485 Driver DC-DC DERATING GRAPHS NM485D6S5MC 100 90 80 70 60 50 Still Air Figure 11. Typical Full-Duplex RS-485 Network 40 30 20 10 0 25 35 45 55 65 75 85 Temperature (°C) EFFICIENCY VS LOAD GRAPH NM485D6S5MC 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 Load (%) TOLERANCE ENVELOPE The voltage tolerance envelope show typical load regulation characteristics for the NM485D6S5MC. The tolerance envelope is the maximum output voltage variation due to changes in output loading and set point accuracy. NM485D6S5MC 9% 6% 2% -3% 10 25 50 75 100 Output Load Current (%) www.murata-ps.com/support KDC_NM485D6S5MC.B02 age 8 of 11 Efficiency (%) Output Voltage Load (%) NM485D6S5MC Isolated RS485 Driver DC-DC EMC FILTERING AND SPECTRA FILTERING The following filter circuit and table shows the input capacitor and input inductor typically required to meet EN55022 Curve A and B, Quasi-Peak EMC limit, as shown in the following plot. The following plot shows positive and negative quasi peak and CISPR22 Average Limit A (pink line) and CISPR22 Average Limit B (blue line) adherence limits. L1 ISOLATOR C2 C1 R1 485 C1 63V Polycarbonate capacitor Inductor Capacitor Part Number L1 Murata Part Number C1 NM485D6S5MC 22µH 23220C 2.2µF NM485D6S5MC 80 70 60 50 40 30 20 10 0 1.00E+05 1.00E+06 1.00E+07 1.00E+08 Frequency (Hz) www.murata-ps.com/support KDC_NM485D6S5MC.B02 age 9 of 11 dBuV NM485D6S5MC Isolated RS485 Driver DC-DC PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS PIN CONNECTIONS Pin Function 1 5VIN 2 GND 3 RXD 4 RE 5 DE 6 TXD 7 Y 8 Z 9 -6V 10 B 11 A 12 GND 13 +6V 14 5V REG RECOMMENDED FOOTPRINT DETAILS RECOMMENDED ISOLATION BARRIER 0.89 [0.035] x14 PLACES 1.91 [0.075] x14 PLACES 1.37 [0.054] 4.00 [0.157] 4.00 [0.157] 15.87 [0.625] All dimensions in mm (inches), Controlling dimensions is mm. All dimensions in mm (inches), Controlling dimensions is mm. Component layout is shown for reference only. Weight: 2.88g www.murata-ps.com/support KDC_NM485D6S5MC.B02 age 10 of 11 12.57 [0.495] 6.60 [0.260] 4.95 [0.195] 3.30 [0.130] 1.65 [0.065] 7.62 [0.300] 9.27 [0.365] 10.92 [0.430] Ø330 [13.000] OR 13.5 0.531 Ø178 [7.000] Ø Ø 12.5 [ 0.492 ] 38.4 [1.512] MAX # 1.5 [0.059] MIN ## Ø20.2 [Ø0.795] MIN NM485D6S5MC Isolated RS485 Driver DC-DC TAPE & REEL SPECIFICATIONS REEL OUTLINE DIMENSIONS REEL PACKAGING DETAILS Tape & Reel specifications shall conform with current EIA-481 standard Carrier tape pockets shown are Unless otherwise stated all dimensions in mm(inches) illustrative only - Refer to carrier tape Controlling dimension is mm diagram for actual pocket details. # Measured at hub ## Six equi-spaced slots on 180mm/7” reel Reel Quantity: 7” - 80 or 13” - 350 TAPE OUTLINE DIMENSIONS 2.0 [0.079] 4.0 [0.157] +0.1 +0.004 Ø2.0 [Ø0.079] MIN Ø1.5 Ø0.059 -0.0 [ -0.000 ] 1.75 [0.069] COVER TAPE 15.0 [0.592]# 3° MAX 0.5 [0.020] 24.0 [0.945] Tape & Reel specifications shall conform with current EIA-481 standard Unless otherwise stated all dimensions in mm(inches) ±0.1mm (±0.004 Inches) DIRECTION OF UNREELING Controlling dimension is mm Components shall be orientated within the carrier tape as indicated # Measured on a plane 0.3mm above the bottom pocket This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. © 2018 Murata Power Solutions, Inc. www.murata-ps.com/support KDC_NM485D6S5MC.B02 age 11 of 11 LEADER SECTION 400 [15.748] MIN 100 [3.937] MIN GOODS ENCLOSURE SECTION TRAILER SECTION 160 [6.299] MIN 3° MAX 32.0±0.3 [1 .260±0.012] 28.4 [1.118] 8.2 [0.323] 14.2 [0.56] 19.5 [0.769]# 0.2±0.05 [0 .008±0.002]