NM485DC Series www.murata-ps.com Isolated Dual EIA-485 Driver and Receiver ELECTRICAL CHARACTERISTICS Parameter Test conditions Min. Typ. Max. Units Supply voltage, VCC 4.75 5.0 5.25 V High level input voltage, VIH 2.8 V DX ENABLE and D inputs Low level input voltage, VIL 0.8 V Common mode output voltage, VOC -7.0 12 V High level output current IOH Driver -60 mA Low level output current, IOL 60 mA Common mode input voltage, VIC 12 V Differential input voltage, VID 12 V Receiver High level output current, IOH -5.0 mA Low level output current, IOL 25 mA FEATURES RoHS compliant EACH RECEIVER ELECTRICAL CHARACTERISTICS Single 5V supply Parameter Test conditions Min. Typ. Max. Units High threshold differential input, VTH VO=2.7V, IO=-0.4mA 0.2 V Thermal shutdown protection Low threshold differential input, VTL VO=0.5V, IO=16mA -0.2 V EIA-485 and CCITT V.28 compatible Input hysteresis, VT 50 mV High level output voltage, VOH VID=200mV, IOH=-5.0mA 2.7 V Dual differential driver and receiver Low level output voltage, VOL VID=200mV, IOL=25mA 0.8 V Driver tri-state outputs active high enable Other input at 0V, VI=12V 1.0 mA Line input current, II Other input at 0V, VI=-12V -0.8 mA Low Prole 24 pin DIL package style Short circuit output current, IOS -15 mA 1kVrms Isolation Input resistance, RI 12 K DESCRIPTION RECEIVER SWITCHING CHARACTERISTICS The NM485DC is an electrically isolated dual Parameter Test conditions Min. Typ. Max. Units differential driver and receiver designed for bal- Propagation delay time L to H, TPLH VID=-1.5V to 1.5V, CL=15pF 70 155 ns anced mulipoint bus transmission at rates up to Propagation delay time H to L, TPHL 72 135 ns 1.25Mbits per second. The device provides two receive channels and two driver channels. The RECEIVER FUNCTION TABLE two driver channels have an active high enable. Differential inputs A-B RXOUT No external components are needed and a single VID0.2V High level 5V input supply powers all functions either side of -0.2V<VID<+0.2V Undened the isolation boundary. The driver outputs provide VID-0.2V Low level limiting for positive and negative currents and thermal shutdown protection from line fault condi- ISOLATION CHARACTERISTICS tions on the transmission bus line. The receiver Parameter Conditions Min. Typ. Max. Units outputs will always be high if the receiver inputs Isolation test voltage Flash tested for 1 second 1000 Vrms are open. The isolation voltage between input and output is 1000Vrms, the devices are supplied in a ABSOLUTE MAXIMUM RATINGS low prole 24 pin DIL plastic package. Supply voltage VCC with respect to pin 11 7V Input voltage DX ENABLE and D inputs 7V Input voltage range, receiver A or B inputs -25V to +25V Receiver differential input voltage range -25V to +25V Output voltage range, driver -10V to +15V Power dissipation 2000mW Isolation capacitance 40pF Isolation voltage (ash tested for 1 second) 1000Vrms Data transmission rate 1.25Mbps Lead temperature 1.5mm from case for 10 seconds 300C All data taken at TA=25C, VCC=5V. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support KII NM485DC.A07 Page 1 of 6NM485DC Series Isolated Dual EIA-485 Driver and Receiver EACH DRIVER ELECTRICAL CHARACTERISTICS Parameter Test conditions Min. Typ. Max. Units High level output voltage, VOH IOH=-33mA 3.7 V Low level output voltage, VOL IOH=33mA 1.1 V Differential output voltage, VOD1 IO=0 1.5 6.0 V RL=100 2.0 V Differential output voltage, VOD2 RL=54 1.5 5.0 V Change in magnitude of differential output voltage, VOD 0.2 V Common mode output voltage, VOC RL=54 or 100 -1.0 3.0 V Change in magnitude of common mode output voltage, VOC 0.2 V Output current power off, IO VCC=0, VO=-7.0V to 12V 100 A High level input current, IIH VIH=4.0V 2.0 20 A Low level input current, IIL VIL=0.8V -15 mA 1 VO=-7.0V -250 mA Short circuit output current, IOS 1 VO=12V 250 mA DRIVER SWITCHING CHARACTERISTICS Parameter Test conditions Min. Typ. Max. Units Differential output delay time, TDD RL=54, CL=50pF 20 25 ns Output disable time from high level, TPHZ RL=110, CL=50pF 90 120 ns Output disable time from low level, TPLZ RL=110, CL=50pF 30 45 ns Propagation delay time L to H, TPLH 70 145 ns RL=27, CL=50pF Propagation delay time H to L, TPHL 70 145 ns Differential output transition time, TTD RL=54, CL=50pF 150 300 ns Output enable time to high level, TPZH RL=110, CL=50pF 80 120 ns Output enable time to low level, TPZL RL=110, CL=50pF 40 60 ns DRIVER FUNCTION TABLE DXIN DX ENABLE DXY Output DXZ Output High level High level High level Low level Low level High level Low level High level Irrelevant Low level High impedance High impedance TEMPERATURE CHARACTERISTICS Parameter Min. Typ. Max. Units Operating free-air temperature range 060C Storage temperature range -40 125 C 1. Duration of short circuit should not exceed 1 second. www.murata-ps.com/support KII NM485DC.A07 Page 2 of 6