SP490E/491E Enhanced Full Duplex RS-485 Transceivers FEATURES * +5V Only * Low Power BiCMOS * Driver/Receiver Enable (SP491E) * RS-485 and RS-422 Drivers/Receivers * Pin Compatible with LTC490 and SN75179 (SP490E) * Pin Compatible with LTC491 and SN75180 (SP491E) * Improved ESD Specifications: 15kV Human Body Model 15kV IEC61000-4-2 Air Discharge 8kV IEC61000-4-2 Contact Discharge Now Available in Lead Free Packaging DESCRIPTION The SP490E is a low power differential line driver/receiver meeting RS-485 and RS-422 standards up to 10Mbps. The SP491E is identical to the SP490E with the addition of driver and 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 NSOIC packages for operation over the commercial and industrial temperature ranges. The SP491E is available in 14-pin DIP and 14-pin NSOIC packages for operation over the commercial and industrial temperature ranges. BLOCK DIAGRAMS SP490E SP491E Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com SP490E,491E_100_052711 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCC....................................................................................................+7V Input Voltages Drivers................................................-0.5V to (VCC+0.5V) Receivers..................................................................14V Output Voltages Drivers......................................................................14V Receivers...........................................-0.5V to (VCC+0.5V) Storage Temperature....................................................-65C to +150 Power Dissipation.....................................................................1000mW ELECTRICAL CHARACTERISTICS TMIN to TMAX and VCC = 5V 5% unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP490E DRIVER DC Characteristics Differential Output Voltage GND VCC Volts Unloaded; R = ; see figure 1 Differential Output Voltage 2 VCC Volts With Load; R = 50; (RS422); see figure 1 Differential Output Voltage1.5 VCC Volts With Load; R = 27; (RS485); see figure 1 Change in Magnitude of Driver Differential Output Voltage for Complimentary States 0.2 Volts R = 27 or R = 50; see figure 1 Driver Common-Mode Output Voltage 3 Volts R = 27 or R = 50; see figure 1 Input High Voltage 2.0 Volts Applies to D Input Low Voltage 0.8 Volts Applies to D Input Current 10 A Applies to D Driver Short-Circuit Current VOUT = HIGH 250 mA7V VO +12V VOUT = LOW 250 mA7V VO +12V SP490E DRIVER AC Characteristics Maximum Data Rate10 Mbps Driver Input to Output 30 60 ns Driver Input to Output 30 60 ns Driver Skew 5 ns Driver Rise or Fall Time15 40 ns tPLH; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 5 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 5 see figures 3 and 5, tSKEW = | tDPLH - tDPHL | From 10% to 90%; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 5 SP490E RECEIVER DC Characteristics Differential Input Threshold -0.2 +0.2 Input Hysteresis 70 Output Voltage High 3.5 Output Voltage Low 0.4 Input Resistance 12 15 Input Current (A, B); VIN = 12V 1.0 Input Current (A, B); VIN = -7V -0.8 Short-Circuit Current 85 Volts7V VCM 12V mV VCM = 0V Volts IO = 4mA, VID = +200mV Volts IO = +4mA, VID = 200mV k7V VCM 12V mA VIN = 12V mA VIN = -7V mA 0V VO VCC Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com SP490E,491E_100_052711 ELECTRICAL CHARACTERISTICS TMIN to TMAX and VCC = 5V 5% unless otherwise noted. PARAMETERS SP490E RECEIVER MIN. TYP. MAX. UNITS AC Characteristics Maximum Data Rate10 Mbps Receiver Input to Output 20 45100 ns Receiver Input to Output 20 45100 ns Diff. Receiver Skew ItPLH-tPHLI13 ns POWER REQUIREMENTS Supply Voltage +4.75 +5.25 Supply Current 900 ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) Industrial (_E_) Storage Temperature Package Plastic DIP (_P) NSOIC (_N) 0 -40 -65 +70 +85 +150 CONDITIONS tPLH; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 RDIFF = 54; CL1 = CL2 = 100pF; Figures 3 & 7 Volts A C C C Figure 1. Driver DC Test Load Circuit Figure 2. Receiver Timing Test Load Circuit Figure 3. Driver/Receiver Timing Test Circuit Figure 4. Driver Timing Test Load #2 Circuit Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com SP490E,491E_100_052711 Figure 5. Driver Propagation Delays Figure 6. Driver Enable and Disable Times Figure 7. Receiver Propagation Delays Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com SP490E,491E_100_052711 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCC...................................................................................................+7V Input 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....................................................................14V Receivers.........................................-0.5V to (VCC+0.5V) Storage Temperature.....................................................-65C to +150 Power Dissipation.................................................................1000mW ELECTRICAL CHARACTERISTICS TMIN to TMAX and VCC = 5V 5% unless otherwise noted. PARAMETERS SP491E DRIVER MIN. TYP. MAX. UNITS CONDITIONS DC Characteristics Differential Output Voltage GND VCC Volts Unloaded; R = ; see figure 1 Differential Output Voltage 2 VCC Volts With Load; R = 50; (RS422); see figure 1 Differential Output Voltage1.5 VCC Volts With Load; R = 27; (RS485); see figure Change in Magnitude of Driver Differential Output Voltage for Complimentary States 0.2 Volts R = 27 or R = 50; see figure 1 Driver Common-Mode Output Voltage 3 Volts R = 27 or R = 50; see figure 1 Input High Voltage 2.0 Volts Applies to D, RE, DE Input Low Voltage 0.8 Volts Applies to D, RE, DE Input Current 10 A Applies to D, RE, DE Driver Short-Circuit Current VOUT = HIGH 250 mA7V VO 12V VOUT = LOW 250 mA7V VO 12V SP491E DRIVER AC Characteristics Maximum Data Rate10 Mbps Driver Input to Output 30 60 ns Driver Input to Output 30 60 ns Driver Skew 510 ns Driver Rise or Fall Time15 40 ns Driver Enable to Output High 40 70 ns Driver Enable to Output Low 40 70 ns Driver Disable Time from Low 40 70 ns Driver Disable Time from High 40 70 ns RE = 5V, DE = 5V tPLH; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 5 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 5 see figures 3 and 5, tSKEW = | tDPLH - tDPHL | From 10% to 90%; RDIFF = 54, CL1 = CL2 = 100pF; see figures 3 and 5 CL1 = CL2 = 100pF; see figures 4 and 6; S2 closed CL1 = CL2 = 100pF; see figures 4 and 6; S1 closed CL1 = CL2 = 100pF; see figures 4 and 6; S1 closed CL1 = CL2 = 100pF; see figures 4 and 6; S2 closed Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com SP490E,491E_100_052711 ELECTRICAL CHARACTERISTICS TMIN to TMAX and VCC = 5V 5% unless otherwise noted. PARAMETERS MIN. TYP. MAX. SP491E RECEIVER DC Characteristics Differential Input Threshold -0.2 +0.2 Input Hysteresis 70 Output Voltage High 3.5 Output Voltage Low 0.4 Three State (high impedance) Output Current 1 Input Resistance 12 15 Input Current (A, B); VIN = 12V 1.0 Input Current (A, B); VIN = -7V -0.8 Short-Circuit Current 85 UNITS Volts7V VCM 12V mV VCM = 0V Volts IO = 4mA, VID = +200mV Volts IO = +4mA, VID = 200mV A 0.4V VO 2.4V; RE = 5V k7V VCM 12V mA DE = 0V, VCC = 0V or 5.25V, VIN = 12V mA DE = 0V, VCC = 0V or 5.25V, VIN = -7V mA 0V VO VCC SP491E RECEIVER AC Characteristics Maximum Data Rate10 Mbps Receiver Input to Output 20 45100 ns Receiver Input to Output 20 45100 ns Diff. Receiver Skew ItPLH-tPHLI13 ns Receiver Enable to Output Low 45 70 ns Receiver Enable to Output High 45 70 ns Receiver Disable from Low 45 70 ns Receiver Disable from High 45 70 ns POWER REQUIREMENTS Supply Voltage +4.75 +5.25 Supply Current 900 SP491E ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) 0 +70 Industrial (_E_) -40 +85 Storage Temperature -65 +150 Package Plastic DIP (_P) NSOIC (_N) CONDITIONS Volts A RE = 0V tPLH; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 tPHL; RDIFF = 54, CL1 = CL2 = 100pF; Figures 3 & 7 RDIFF = 54; CL1 = CL2 = 100pF; Figures 3 & 7 CRL = 15pF; Figures 2 and 8; S1 closed CRL = 15pF; Figures 2 and 8; S2 closed CRL = 15pF; Figures 2 and 8; S1 closed CRL = 15pF; Figures 2 and 8; S2 closed RE, D = 0V or VCC; DE = VCC C C C Figure 8. Receiver Enable and Disable Times Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com SP490E,491E_100_052711 DESCRIPTION The driver of the SP491E has a driver enable control line which is active high. A logic high on DE (pin 4) of the SP491E will enable the differential 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. The SP490E and SP491E are f u l l - d u p l e x d i ff e r e n t i a l t r a n s c e i v ers that meet the requirements of RS-485 and RS-422. Fabricated with a Exar proprietary BiCMOS process, both products require a fraction of the power of older bipolar designs. Receiver... The RS-485 standard is ideal for multi-drop applications or for long-distance interfaces. RS-485 allows up to 32 drivers and 32 receivers to be connected to a data bus, making it an ideal choice for multi-drop applications. Since the cabling can be as long as 4,000 feet, RS-485 transceivers are equipped with a wide (-7V to +12V) common mode range to accommodate ground potential differences. Because RS-485 is a differential interface, data is virtually immune to noise in the transmission line. The receivers for both the SP490E and SP491E have differential inputs with an input sensitivity as low as 200mV. Input impedance of the receivers is typically 15k (12k minimum). A wide common mode range of -7V to +12V allows for large ground potential differences between systems. The receivers for both the SP490E and SP491E are equipped with the fail-safe feature. Fail-safe guarantees that the receiver output will be in a high state when the input is left unconnected. Driver... The receiver of the SP491E has a receiver enable control line which is active low. A logic low on REB (pin 3) of the SP491E will enable the differential receiver. A logic high on REB (pin 3) of the SP491E will tri-state the receiver. The drivers for both the SP490E and SP491E have differential outputs. The typical voltage output swing with no load will be 0 volts to +5 volts. With worst case loading of 54 across the differential outputs, the driver can maintain greater than 1.5V voltage levels. Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com SP490E,491E_100_052711 With the Air Discharge Method, an ESD voltage is applied to the equipment under test (EUT) through air. This simulates an electrically charged person ready to connect a cable onto the rear of the system only to find an unpleasant zap just before the person touches the back panel. The high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. This energy, whether discharged directly or through air, is predominantly a function of the discharge current rather than the discharge voltage. Variables with an air discharge such as approach speed of the object carrying the ESD potential to the system and humidity will tend to change the discharge current. For example, the rise time of the discharge current varies with the approach speed. ESD Tolerance The SP490E/SP491E devices incorporates ruggedized ESD cells on all driver output and receiver input pins. The ESD structure is improved over our previous family for more rugged applications and environments sensitive to electro-static discharges and associated transients. The improved ESD tolerance is at least 15kV without damage nor latch-up. There are different methods of ESD testing applied: a) MIL-STD-883, Method 3015.7 b) IEC61000-4-2 Air-Discharge c) IEC61000-4-2 Direct Contact The Human Body Model has been the generally accepted ESD testing method for semiconductors. This method is also specified in MIL-STD-883, Method 3015.7 for ESD testing. The premise of this ESD test is to simulate the human body's potential to store electro-static energy and discharge it to an integrated circuit. The simulation is performed by using a test model as shown in Figure 9. This method will test the IC's capability to withstand an ESD transient during normal handling such as in manufacturing areas where the ICs tend to be handled frequently. The Contact Discharge Method applies the ESD current directly to the EUT. This method was devised to reduce the unpredictability of the ESD arc. The discharge current rise time is constant since the energy is directly transferred without the air-gap arc. In situations such as hand held systems, the ESD charge can be directly discharged to the equipment from a person already holding the equipment. The current is transferred on to the keypad or the serial port of the equipment directly and then travels through the PCB and finally to the IC. The IEC-61000-4-2, formerly IEC801-2, is generally used for testing ESD on equipment and systems. For system manufacturers, they must guarantee a certain amount of ESD protection since the system itself is exposed to the outside environment and human presence. The premise with IEC61000-4-2 is that the system is required to withstand an amount of static electricity when ESD is applied to points and surfaces of the equipment that are accessible to personnel during normal usage. The transceiver IC receives most of the ESD current when the ESD source is applied to the connector pins. The test circuit for IEC61000-4-2 is shown on Figure 10. There are two methods within IEC61000-4-2, the Air Discharge method and the Contact Discharge method. The circuit model in Figures 9 and 10 represent the typical ESD testing circuit used for all three methods. The CS is initially charged with the DC power supply when the first switch (SW1) is on. Now that the capacitor is charged, the second switch (SW2) is on while SW1 switches off. The voltage stored in the capacitor is then applied through RS, the current limiting resistor, onto the device under test (DUT). In ESD tests, the SW2 switch is pulsed so that the device under test receives a duration of voltage. Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com SP490E,491E_100_052711 For the Human Body Model, the current limiting resistor (RS) and the source capacitor (CS) are 1.5k an 100pF, respectively. For IEC-61000-4-2, the current limiting resistor (RS) and the source capacitor (CS) are 330 an 150pF, respectively. The higher CS value and lower RS value in the IEC61000-4-2 model are more stringent than the Human Body Model. The larger storage capacitor injects a higher voltage to the test point when SW2 is switched on. The lower current limiting resistor increases the current charge onto the test point. RS RC SW1 SW2 Device Under Test CS DC Power Source Figure 9. ESD Test Circuit for Human Body Model Contact-Discharge Model RS RC SW1 RV SW2 Device Under Test CS DC Power Source R S and RV add up to 330 for IEC61000-4-2. I Figure 10. ESD Test Circuit for IEC61000-4-2 30A 15A 0A t = 0ns t t = 30ns Figure 11. ESD Test Waveform for IEC61000-4-2 Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com SP490E,491E_100_052711 Sp490E, SP491E Human Body IEC61000-4-2 Family MODEL Air Discharge Direct Contact Level Driver Outputs Receiver Inputs 15kV 15kV 15kV 15kV 8kV 8kV 4 4 Tabke 1. Transceiver ESD Tolerance Levels Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com 10 SP490E,491E_100_052711 Package: 8 Pin nSOIC Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com 11 SP490E,491E_100_052711 Package: 14 Pin nSOIC Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com 12 SP490E,491E_100_052711 Package: 8 Pin PDIP Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com 13 SP490E,491E_100_052711 Package: 14 Pin PDIP Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com 14 SP490E,491E_100_052711 ordering information Model Temperature Range Package SP490ECN-L................................................................................... 0C to +70C................................................................................ 8-Pin NSOIC SP490ECN-L/TR............................................................................. 0C to +70C................................................................................ 8-Pin NSOIC SP490ECP-L................................................................................... 0C to +70C..................................................................................8-Pin PDIP SP490EEN-L................................................................................. -40C to +85C............................................................................... 8-Pin NSOIC SP490EEN-L/TR........................................................................... -40C to +85C............................................................................... 8-Pin NSOIC SP490EEP-L................................................................................. -40C to +85C................................................................................. 8-Pin PDIP SP491ECN-L................................................................................... 0C to +70C............................................................................... 14-Pin NSOIC SP491ECN-L/TR............................................................................. 0C to +70C............................................................................... 14-Pin NSOIC SP491ECP-L................................................................................... 0C to +70C.................................................................................14-Pin PDIP SP491EEN-L................................................................................. -40C to +85C.............................................................................. 14-Pin NSOIC SP491EEN-L/TR........................................................................... -40C to +85C.............................................................................. 14-Pin NSOIC SP491EEP-L................................................................................. -40C to +85C................................................................................ 14-Pin PDIP Note: /TR = Tape and Reel REVISION HISTORY Date Revision 2000 14 May 2011 1.0.0 Description Sipex Legacy Data Sheet Convert to Exar format. Remove driver propagation delay minimum and driver rise/fall time minimum entry for SP490E and SP491E. Update ESD rating to IEC61000-4-2. Update ordering information. Notice EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writting, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Copyright 2011 EXAR Corporation Datasheet May 2011 Send your serial transceiver technical inquiry with technical details to: serialtechsupport@exar.com Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510)668-7017 * www.exar.com 15 SP490E,491E_100_052711