Low Power BiCMOS
Driver/Receiver Enable (SP491E)
RS-485 and RS-422 Drivers/ReceiversPin Compatible with LTC490 andSN75179 (SP490E)
sPin Compatible with LTC491 andSN75180 (SP491E)
sImproved ESD Specifications:
±15kV Human Body Model
±15kV IEC1000-4-2 Air Discharge±8kV IEC1000-4-2 Contact Discharge
DESCRIPTION…
The SP490E is a low power differential line driver/receiver meeting RS-485 and RS-422standards up to 10Mbps. The SP491E is identical to the SP490E with the addition of driverand receiver tri-state enable lines. Both products feature ±200mV receiver input sensitivity,over wide common mode range. The SP490E is available in 8-pin plastic DIP and 8-pin NSOICpackages for operation over the commercial and industrial temperature ranges. The SP491Eis available in 14-pin DIP and 14-pin NSOIC packages for operation over the commercial andindustrial temperature ranges.
Now available in Lead Free
sssss
NC114Vcc13NC12AVcc1R2R28AR11BRREB37B6ZDE410ZD5GND6GND7D3GND4D5YD9Y8NCSP490ESP491ESP490EDS/14SP490E Enhanced Full Duplex RS-485 Transceivers© Copyright 2000 Sipex Corporation
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深圳市万瑞尔科技有限公司 SIPEX代理商 0755-28269789 www.wonreal.netABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device atthese ratings or any other above those indicated in the operation sectionsof the specifications below is not implied. Exposure to absolute maximumrating conditions for extended periods of time may affect reliability.VCC....................................................................................................+7VInput Voltages
Drivers................................................-0.5V to (VCC+0.5V)Receivers..................................................................±14V
Output Voltages
Drivers......................................................................±14VReceivers...........................................-0.5V to (VCC+0.5V)
Storage Temperature....................................................-65˚C to +150˚Power Dissipation.....................................................................1000mW
SPECIFICATIONS
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.PARAMETERSSP490E DRIVERDC CharacteristicsDifferential Output VoltageDifferential Output VoltageDifferential Output VoltageChange in Magnitude of DriverDifferential Output Voltage forComplimentary StatesDriver Common-ModeOutput VoltageInput High VoltageInput Low VoltageInput CurrentDriver Short-Circuit Current VOUT = HIGH VOUT = LOWSP490E DRIVERAC CharacteristicsMaximum Data RateDriver Input to OutputDriver Input to OutputDriver SkewDriver Rise or Fall TimeMIN.TYP.MAX.UNITSCONDITIONSGND21.5VCCVCCVCC0.23VoltsVoltsVoltsVoltsVoltsVoltsVoltsµAmAmAUnloaded; R = ∞; see Figure 1With Load; R = 50Ω; (RS-422);see Figure 1With Load; R = 27Ω; (RS-485); see Figure 1R = 27Ω or R = 50Ω; see Figure 1R = 27Ω or R = 50Ω; see Figure 1Applies to DApplies to DApplies to D-7V ≤ VO ≤ +12V-7V ≤ VO ≤ +12V2.00.8±10±250±250102020303056060Mbpsnsnsns31540nsRDIFF = 54Ω, CL1 = CL2 = 100pFtPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF;see Figures 3 and 6tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF;see Figures 3 and 5see Figures 3 and 5,tSKEW = | tDPLH - tDPHL|From 10% to 90%; RDIFF = 54Ω,CL1 = CL2 = 100pF; see Figures 3 and 5SP490E RECEIVERDC CharacteristicsDifferential Input Threshold-0.2Input HysteresisOutput Voltage High3.5Output Voltage LowInput Resistance12Input Current (A, B); VIN = 12VInput Current (A, B); VIN = -7VShort-Circuit Current+0.2700.415±1.0-0.885VoltsmVVoltsVoltskΩmAmAmA-7V ≤ VCM ≤ 12VVCM = 0VIO = -4mA, VID = +200mVIO = +4mA, VID = -200mV-7V ≤ VCM ≤ 12VVIN = 12VVIN = -7V0V ≤ VO ≤ VCCSP490EDS/14SP490E Enhanced Full Duplex RS-485 Transceivers© Copyright 2000 Sipex Corporation
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深圳市万瑞尔科技有限公司 SIPEX代理商 0755-28269789 www.wonreal.netSPECIFICATIONS (continued)
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.PARAMETERSSP490E RECEIVERAC CharacteristicsMaximum Data RateReceiver Input to OutputReceiver Input to OutputDiff. Receiver Skew ItPLH-tPHLIPOWER REQUIREMENTSSupply VoltageSupply CurrentENVIRONMENTAL ANDMECHANICALOperating Temperature Commercial (_C_) Industrial (_E_)Storage TemperaturePackage Plastic DIP (_P) NSOIC (_N)MIN.TYP.MAX.UNITSCONDITIONS102020454513100100MbpsnsnsnstPLH; RDIFF = 54Ω,CL1 = CL2 = 100pF; Figures 3 & 7tPHL; RDIFF = 54Ω,CL1 = CL2 = 100pF; Figures 3 & 7RDIFF = 54Ω; CL1 = CL2 = 100pF;Figures 3 & 7+4.75900+5.25VoltsµA0-40-65+70+85+150°C°C°CARVODRBVOCReceiverOutputCRLTest PointS11kS21kVCCFigure 1. Driver DC Test Load CircuitFigure 2. Receiver Timing Test Load Circuit
3VDEDIABRDIFFCL2CL1AROB15pFOutputUnderTest500CLS1VCCS2Figure 3. Driver/Receiver Timing Test CircuitFigure 4. Driver Timing Test Load #2 Circuit
SP490EDS/14SP490E Enhanced Full Duplex RS-485 Transceivers© Copyright 2000 Sipex Corporation
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深圳市万瑞尔科技有限公司 SIPEX代理商 0755-28269789 www.wonreal.net+3VDI0VZYVO1/2VOtDPLHtDPHLf = 1MHz; tR < 10ns; tF < 10ns1.5VtPLHtPHL1/2VO1.5VDRIVEROUTPUTDIFFERENTIALVO+OUTPUT0VVY – VZVO–tSKEW = | tDPLH - tDPHL |Figure 5. Driver Propagation Delays
tRtF+3VDE0V5VA, BY, ZVOLVOHA, BY, Z0Vf = 1MHz; tR < 10ns; tF < 10ns1.5VtZL2.3VOutput normally LOW1.5VtLZ0.5V0.5VtHZ2.3VtZHOutput normally HIGHFigure 6. Driver Enable and Disable Times
f = 1MHz; tR < 10ns; tF < 10nsY – ZV0D2+V0D2–VOHVOLtPHL0VINPUT0VR1.5VOUTPUTtPLH1.5VtSKEW = | tPHL - tPLH |Figure 7. Receiver Propagation Delays
SP490EDS/14SP490E Enhanced Full Duplex RS-485 Transceivers© Copyright 2000 Sipex Corporation
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深圳市万瑞尔科技有限公司 SIPEX代理商 0755-28269789 www.wonreal.netABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device atthese ratings or any other above those indicated in the operation sectionsof the specifications below is not implied. Exposure to absolute maximumrating conditions for extended periods of time may affect reliability.VCC....................................................................................................+7VInput Voltages
Logic...................................................-0.5V to (VCC+0.5V)Drivers................................................-0.5V to (VCC+0.5V)Receivers..................................................................±14V
Output Voltages
Logic...................................................-0.5V to (VCC+0.5V)Drivers......................................................................±14VReceivers...........................................-0.5V to (VCC+0.5V)
Storage Temperature......................................................-65˚C to +150Power Dissipation.....................................................................1000mW
SPECIFICATIONS
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.PARAMETERSSP491E DRIVERDC CharacteristicsDifferential Output VoltageDifferential Output VoltageDifferential Output VoltageChange in Magnitude of DriverDifferential Output Voltage forComplimentary StatesDriver Common-ModeOutput VoltageInput HIGH VoltageInput LOW VoltageInput CurrentDriver Short-Circuit Current VOUT = HIGH VOUT = LOWSP491E DRIVERAC CharacteristicsMaximum Data RateDriver Input to OutputDriver Input to OutputDriver SkewDriver Rise or Fall TimeDriver Enable to Output HIGHDriver Enable to Output LOWDriver Disable Time from LOWDriver Disable Time from HIGHMIN.TYP.MAX.UNITSCONDITIONSGND21.5VCCVCCVCC0.23VoltsVoltsVoltsVoltsVoltsVoltsVoltsµAmAmAUnloaded; R = ∞; see Figure 1With Load; R = 50Ω; (RS-422);see Figure 1With Load; R = 27Ω; (RS-485);see Figure 1R = 27Ω or R = 50Ω; see Figure 1R = 27Ω or R = 50Ω; see Figure 1Applies to D, REB, DEApplies to D, REB, DEApplies to D, REB, DE-7V ≤ VO ≤ 10V-7V ≤ VO ≤ 10V2.00.8±10250250102020303056060104070707070Mbpsnsnsnsnsnsnsnsns31540404040RDIFF = 54Ω, CL1 = CL2 = 100pFtPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF;see Figures 3 and 5tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF;see Figures 3 and 5see Figures 3 and 5,tSKEW = | tDPLH - tDPHL |From 10% to 90%; RDIFF = 54Ω,CL1 = CL2 = 100pF; see Figures 3 and 5CL1 = CL2 = 100pF; see Figures4 and 6; S2 closedCL1 = CL2 = 100pF; see Figures4 and 6; S1 closedCL1 = CL2 = 15pF; see Figures4 and 6; S1 closedCL1 = CL2 = 15pF; see Figures4 and 6; S2 closedSP490EDS/14SP490E Enhanced Full Duplex RS-485 Transceivers© Copyright 2000 Sipex Corporation
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深圳市万瑞尔科技有限公司 SIPEX代理商 0755-28269789 www.wonreal.netSPECIFICATIONS (continued)
TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.PARAMETERSMIN.SP491E RECEIVERDC CharacteristicsDifferential Input Threshold-0.2Input HysteresisOutput Voltage HIGH3.5Output Voltage LOWThree State (high impedance)Output CurrentInput Resistance12Input Current (A, B); VIN = 12VInput Current (A, B); VIN = -7VShort-Circuit CurrentSP491E RECEIVERAC CharacteristicsMaximum Data Rate10Receiver Input to Output20Receiver Input to OutputDiff. Receiver Skew ItPLH-tPHLIReceiver Enable to Output LOWReceiver Enable to Output HIGHReceiver Disable from LOWReceiver Disable from HIGHPOWER REQUIREMENTSSupply Voltage+4.75Supply CurrentSP491E ENVIRONMENTALAND MECHANICALOperating Temperature Commercial (_C_) Industrial (_E_)Storage TemperaturePackage Plastic DIP (_P) NSOIC (_N)20TYP.MAX.UNITSCONDITIONS+0.2700.4±115±1.0-0.885VoltsmVVoltsVoltsµAkΩmAmAmA-7V ≤ VCM ≤ 12VVCM = 0VIO = -4mA, VID = +200mVIO = +4mA, VID = -200mV0.4V ≤ VO ≤ 2.4V; REB = 5V-7V ≤ VCM ≤ 12VDE = 0V, VCC = 0V or 5.25V, VIN = 12VDE = 0V, VCC = 0V or 5.25V, VIN = -7V0V ≤ VO ≤ VCCREB = 0V, DE = 5VtPLH; RDIFF = 54Ω,CL1 = CL2 = 100pF; Figures 3 & 7tPHL; RDIFF = 54Ω,CL1 = CL2 = 100pF; Figures 3 & 7RDIFF = 54Ω; CL1 = CL2 = 100pF;Figures 3 & 745451345454545100100Mbpsnsnsns70707070+5.25nsnsnsnsVoltsµACRL = 15pF; Figures 2 and 8; S1 closedCRL = 15pF; Figures 2 and 8; S2 closedCRL = 15pF; Figures 2 and 8; S1 closedCRL = 15pF; Figures 2 and 8; S2 closedREB, D = 0V or VCC; DE = VCC9000-40-65+70+85+150°C°C°C+3VRE0V5VRVILVIHR0V1.5Vf = 1MHz; t < 10ns; t< 10nsRF tZL1.5VOutput normally LOW1.5VtLZ0.5V0.5VtHZ1.5VtZHOutput normally HIGHFigure 8. Receiver Enable and Disable TimesSP490EDS/14SP490E Enhanced Full Duplex RS-485 Transceivers© Copyright 2000 Sipex Corporation
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深圳市万瑞尔科技有限公司 SIPEX代理商 0755-28269789 www.wonreal.netFEATURES
The SP490E and SP491E are full-duplex dif-ferential transceivers that meet the requirementsof RS-485 and RS-422. Fabricated with a Sipexproprietary BiCMOS process, both productsrequire a fraction of the power of older bipolardesigns.
THEORY OF OPERATION
The RS-485 standard is ideal for multi-dropapplications or for long-distance interfaces.RS-485 allows up to 32 drivers and 32 receiversto be connected to a data bus, making it an idealchoice for multi-drop applications. Since thecabling can be as long as 4,000 feet, RS-485transceivers are equipped with a wide (-7V to+12V) common mode range to accommodateground potential differences. Because RS-485is a differential interface, data is virtuallyimmune to noise in the transmission line.Drivers
The drivers for both the SP490E and SP491Ehave differential outputs. The typical voltageoutput swing with no load will be 0 volts to +5volts. With worst case loading of 54Ω across thedifferential outputs, the driver can maintaingreater than 1.5V voltage levels.
The driver of the SP491E has a driver enablecontrol line which is active high. A logic high onDE (pin 4) of the SP491E will enable the differ-ential driver outputs. A logic low on DE (pin 4)of the SP491E will tri-state the driver outputs.The SP490E does not have a driver enable.
RCCSW1DC PowerSourceReceivers
The receivers for both the SP490E and SP491Ehave differential inputs with an input sensitivityas low as ±200mV. Input impedance of thereceivers is typically 15kΩ (12kΩ minimum).A wide common mode range of -7V to +12Vallows for large ground potential differencesbetween systems. The receivers for both theSP490E and SP491E are equipped with thefail-safe feature. Fail-safe guarantees thatthe receiver output will be in a high state whenthe input is left unconnected.
The receiver of the SP491E has a receiverenable control line which is active low. A logiclow on REB (pin 3) of the SP491E will enablethe differential receiver. A logic high on REB(pin 3) of the SP491E will tri-state the receiver.ESD Tolerance
The SP490E/SP491E devices incorporateruggedized ESD cells on all driver outputand receiver input pins. The ESD structure isimproved over our previous family for morerugged applications and environments sensitiveto electro-static discharges and associatedtransients. The improved ESD tolerance is atleast ±15kV without damage nor latch-up.
RSSSW2CSSDeviceUnderTestFigure 9. ESD Test Circuit for Human Body ModelSP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
© Copyright 2000 Sipex Corporation
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深圳市万瑞尔科技有限公司 SIPEX代理商 0755-28269789 www.wonreal.netContact-Discharge ModuleRRCCSW1SW1DC PowerSourceRRSSRVSW2SW2CCSSDeviceUnderTest for IEC1000-4-2.RS or IEC1000-4-2.S and RV V add up to 330Ω fFigure 10. ESD Test Circuit for IEC1000-4-2
There are different methods of ESD testing
applied:
a) MIL-STD-883, Method 3015.7b) IEC1000-4-2 Air-Dischargec) IEC1000-4-2 Direct ContactThe Human Body Model has been the generallyaccepted ESD testing method for semiconductors.This method is also specified in MIL-STD-883,Method 3015.7 for ESD testing. The premise ofthis ESD test is to simulate the human body’spotential to store electro-static energy anddischarge it to an integrated circuit. Thesimulation is performed by using a test model asshown in Figure 9. This method will test the IC’scapability to withstand an ESD transient duringnormal handling such as in manufacturing areaswhere the ICs tend to be handled frequently.The IEC-1000-4-2, formerly IEC801-2, isgenerally used for testing ESD on equipment andsystems. For system manufacturers, they mustguarantee a certain amount of ESD protectionsince the system itself is exposed to the outsideenvironment and human presence. The premisewith IEC1000-4-2 is that the system is requiredto withstand an amount of static electricity whenESD is applied to points and surfaces of the
equipment that are accessible to personnel duringnormal usage. The transceiver IC receives mostof the ESD current when the ESD source isapplied to the connector pins. The test circuit forIEC1000-4-2 is shown on Figure 10. There aretwo methods within IEC1000-4-2, the AirDischarge method and the Contact Dischargemethod.
With the Air Discharge Method, an ESD voltageis applied to the equipment under test (EUT)through air. This simulates an electrically charged
30A
15A
0A
t=0ns
t ¥
Figure 11. ESD Test Waveform for IEC1000-4-2
t=30ns
SP490EDS/14SP490E Enhanced Full Duplex RS-485 Transceivers
i ¥© Copyright 2000 Sipex Corporation
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深圳市万瑞尔科技有限公司 SIPEX代理商 0755-28269789 www.wonreal.netperson ready to connect a cable onto the rear ofthe system only to find an unpleasant zap justbefore the person touches the back panel. Thehigh energy potential on the person dischargesthrough an arcing path to the rear panel of thesystem before he or she even touches the system.This energy, whether discharged directly orthrough air, is predominantly a function of thedischarge current rather than the dischargevoltage. Variables with an air discharge such asapproach speed of the object carrying the ESDpotential to the system and humidity will tend tochange the discharge current. For example, therise time of the discharge current varies with theapproach speed.
The Contact Discharge Method applies the ESDcurrent directly to the EUT. This method wasdevised to reduce the unpredictability of theESD arc. The discharge current rise time isconstant since the energy is directly transferredwithout the air-gap arc. In situations such ashand held systems, the ESD charge can be directlydischarged to the equipment from a person alreadyholding the equipment. The current is transferredon to the keypad or the serial port of the equipmentdirectly and then travels through the PCB andfinally to the IC.
The circuit models in Figures 9 and 10 representthe typical ESD testing circuits used for all threemethods. The CS is initially charged with the DCpower supply when the first switch (SW1) is on.Now that the capacitor is charged, the secondswitch (SW2) is on while SW1 switches off. Thevoltage stored in the capacitor is then appliedthrough RS, the current limiting resistor, onto thedevice under test (DUT). In ESD tests, the SW2switch is pulsed so that the device under testreceives a duration of voltage.
For the Human Body Model, the current limitingresistor (RS) and the source capacitor (CS) are1.5kΩ an 100pF, respectively. For IEC-1000-4-2, the current limiting resistor (RS) and the sourcecapacitor (CS) are 330Ω an 150pF, respectively.The higher CS value and lower RS value in theIEC1000-4-2 model are more stringent than theHuman Body Model. The larger storage capacitorinjects a higher voltage to the test point whenSW2 is switched on. The lower current limitingresistor increases the current charge onto the testpoint.
SP490E/SP491E HUMAN BODY IEC1000-4-2Family MODEL Air Discharge Direct Contact LevelDriver OutputsReceiver Inputs ±15kV ±15kV ±15kV ±15kV ±8kV ±8kV 4 4Table 1. Transceiver ESD Tolerance Levels
SP490EDS/14SP490E Enhanced Full Duplex RS-485 Transceivers© Copyright 2000 Sipex Corporation
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深圳市万瑞尔科技有限公司 SIPEX代理商 0755-28269789 www.wonreal.netPACKAGE: PLASTICDUAL–IN–LINE(NARROW)E1ED1 = 0.005\" min.(0.127 min.)DA1 = 0.015\" min.(0.381min.)A = 0.210\" max.(5.334 max).A2CØeA = 0.300 BSC(7.620 BSC)Le = 0.100 BSC(2.540 BSC)B1BALTERNATEEND PINS(BOTH ENDS)DIMENSIONS (Inches)Minimum/Maximum(mm)A2BB1CDEE1LØ8–PIN0.115/0.195(2.921/4.953)0.014/0.022(0.356/0.559)0.045/0.070(1.143/1.778)0.008/0.014(0.203/0.356)14–PIN0.115/0.195(2.921/4.953)0.014/0.022(0.356/0.559)0.045/0.070(1.143/1.778)0.008/0.014(0.203/0.356)16–PIN0.115/0.195(2.921/4.953)0.014/0.022(0.356/0.559)0.045/0.070(1.143/1.778)0.008/0.014(0.203/0.356)18–PIN0.115/0.195(2.921/4.953)0.014/0.022(0.356/0.559)0.045/0.070(1.143/1.778)0.008/0.014(0.203/0.356)20–PIN0.115/0.195(2.921/4.953)0.014/0.022(0.356/0.559)0.045/0.070(1.143/1.778)0.008/0.014(0.203/0.356)22–PIN0.115/0.195(2.921/4.953)0.014/0.022(0.356/0.559)0.045/0.070(1.143/1.778)0.008/0.014(0.203/0.356)0.355/0.4000.735/0.7750.780/0.8000.880/0.9200.980/1.0601.145/1.155(9.017/10.160)(18.669/19.685)(19.812/20.320)(22.352/23.368)(24.892/26.924)(29.083/29.337)0.300/0.325(7.620/8.255)0.240/0.280(6.096/7.112)0.115/0.150(2.921/3.810)0°/ 15°(0°/15°)0.300/0.325(7.620/8.255)0.240/0.280(6.096/7.112)0.115/0.150(2.921/3.810)0°/ 15°(0°/15°)0.300/0.325(7.620/8.255)0.240/0.280(6.096/7.112)0.115/0.150(2.921/3.810)0°/ 15°(0°/15°)0.300/0.325(7.620/8.255)0.240/0.280(6.096/7.112)0.115/0.150(2.921/3.810)0°/ 15°(0°/15°)0.300/0.325(7.620/8.255)0.240/0.280(6.096/7.112)0.115/0.150(2.921/3.810)0°/ 15°(0°/15°)0.300/0.325(7.620/8.255)0.240/0.280(6.096/7.112)0.115/0.150(2.921/3.810)0°/ 15°(0°/15°)SP490EDS/14SP490E Enhanced Full Duplex RS-485 Transceivers© Copyright 2000 Sipex Corporation
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深圳市万瑞尔科技有限公司 SIPEX代理商 0755-28269789 www.wonreal.netPACKAGE: PLASTICSMALL OUTLINE (SOIC)(NARROW)EHh x 45°DAØeBA1LDIMENSIONS (Inches)Minimum/Maximum(mm)AA1BDEeHhLØ8–PIN0.053/0.069(1.346/1.748)0.004/0.010(0.102/0.2490.014/0.019(0.35/0.49)0.189/0.197(4.80/5.00)0.150/0.157(3.802/3.988)0.050 BSC(1.270 BSC)0.228/0.244(5.801/6.198)0.010/0.020(0.254/0.498)0.016/0.050(0.406/1.270)0°/8°(0°/8°)14–PIN0.053/0.069(1.346/1.748)0.004/0.010(0.102/0.249)0.013/0.020(0.330/0.508)16–PIN0.053/0.069(1.346/1.748)0.004/0.010(0.102/0.249)0.013/0.020(0.330/0.508)0.337/0.3440.386/0.394(8.552/8.748)(9.802/10.000)0.150/0.157(3.802/3.988)0.050 BSC(1.270 BSC)0.228/0.244(5.801/6.198)0.010/0.020(0.254/0.498)0.016/0.050(0.406/1.270)0°/8°(0°/8°)0.150/0.157(3.802/3.988)0.050 BSC(1.270 BSC)0.228/0.244(5.801/6.198)0.010/0.020(0.254/0.498)0.016/0.050(0.406/1.270)0°/8°(0°/8°)SP490EDS/14SP490E Enhanced Full Duplex RS-485 Transceivers© Copyright 2000 Sipex Corporation
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深圳市万瑞尔科技有限公司 SIPEX代理商 0755-28269789 www.wonreal.netORDERING INFORMATION
ModelTemperature RangePackageSP490ECN.......................................................0˚C to +70˚C.....................................................8-Pin NSOICSP490ECP........................................................0˚C to +70˚C...........................................................8-Pin DIPSP490EEN......................................................-40˚C to +85˚C...................................................8-Pin NSOICSP490EEP......................................................-40˚C to +85˚C.........................................................8-Pin DIPSP491ECN.......................................................0˚C to +70˚C...................................................14-Pin NSOICSP491ECP........................................................0˚C to +70˚C.........................................................14-Pin DIPSP491EEN......................................................-40˚C to +85˚C.................................................14-Pin NSOICSP491EEP......................................................-40˚C to +85˚C.......................................................14-Pin DIP
Now available in Lead Free. To order add \"-L' to the part number. Example: SP488A = normal, SP488A-L = Lead free
SP490EDS/14SP490E Enhanced Full Duplex RS-485 Transceivers© Copyright 2000 Sipex Corporation
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