SP483EEN-L/TR

SP483E Enhanced Low EMI Half-Duplex RS-485 Transceiver Description The SP483E is a half-duplex transceiver that meets the specifications of RS-485 and RS-422 serial protocols with enhanced ESD performance. The ESD tolerance has been improved on these devices to over ±15kV for both Human Body Model and IEC61000-4-2 Air Discharge Method. This device is pin-to-pin compatible with MaxLinear’s SP483 device as well as popular industry standards. As with the original versions, the SP483E feature MaxLinear’s BiCMOS design allowing low power operation without sacrificing performance. The SP483E is internally slew rate limited to reduce EMI and can meet the requirements of RS-485 and RS-422 up to 250kbps. The SP483E is also equipped with a low power shutdown mode. FEATURES ■■ 5V only ■■ Low power BiCMOS ■■ Driver / receiver enable for multi-drop configurations ■■ Enhanced ESD specifications: ±15kV Human Body Model ±15kV IEC61000-4-2 Air Discharge ±8kV IEC61000-4-2 Contact Discharge ■■ Low EMI transceiver limited to 250kbps ■■ Low power 1µA shutdown mode Ordering Information - Back Page Block Diagram R RO 1 8 VCC RE 2 7 B DE 3 6 A DI 4 D 5 GND SP483E REV 1.0.1 1/11 SP483E 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................................................................................ 7.0V Input Voltages Logic......................... -0.3V to (VCC + 0.5V) Drivers...................... -0.3V to (VCC + 0.5V) Receivers............................................ ±15V Output Voltages Logic......................... -0.3V to (VCC + 0.5V) Drivers................................................ ±15V Receivers..................-0.3V to (VCC + 0.5V) Storage Temperature..................................-65˚C to +150˚C Power Dissipation..................................................... 500mW Electrical Characteristics TAMB = TMIN to TMAX and VCC = 5V ±5% unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS VCC V Unloaded; R = ∞Ω ; Figure 1 SP483E Driver DC Characteristics Differential output voltage Differential output voltage 2 VCC V With load; R = 50Ω (RS-422); Figure 1 Differential output voltage 1.5 VCC V With load; R = 27Ω (RS-485); Figure 1 0.2 V R = 27Ω or R = 50Ω; Figure 1 3 V R = 27Ω or R = 50Ω; Figure 1 V Applies to DE, DI, RE Change in magnitude of driver differential output voltage for complimentary states Driver common-mode output voltage Input high voltage 2.0 Input low voltage 0.8 V Applies to DE, DI, RE Input current, driver input 10 µA Applies to,DI Input current, control lines 1 µA Applies to,DE, RE Driver short circuit current VOUT = HIGH ±250 mA -7V ≤ VO ≤ 12V Driver short circuit current VOUT = LOW ±250 mA -7V ≤ VO ≤ 12V REV 1.0.1 2/11 SP483E Electrical Characteristics (Continued) TAMB = TMIN to TMAX and VCC = 5V ±5% unless otherwise noted. PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP483E Driver AC Characteristics kbps RE = 5V, DE = 5V; RDIFF = 54Ω, CL1 = CL2 = 100pF 2000 ns See Figures 3 & 5, RDIFF = 54Ω, CL1 = CL2 = 100pF 800 2000 ns See Figures 3 & 5, RDIFF = 54Ω, CL1 = CL2 = 100pF 100 800 ns See Figures 3 and 5, tSKEW = |tDPHL - tDPLH| Maximum data rate 250 Driver input to output, tPLH 250 800 Driver input to output, tPHL 250 Driver skew Driver rise or fall time 250 2000 ns From 10%-90%; RDIFF = 54Ω CL1 = CL2 = 100pF; See Figures 3 and 6 Driver enable to output high 250 2000 ns CL = 100pF, See Figures 4 and 6, S2 closed Driver enable to output low 250 2000 ns CL = 100pF, See Figures 4 and 6, S1 closed Driver disable time from high 300 3000 ns CL = 15pF, See Figures 4 and 6, S2 closed Driver disable time from low 300 3000 ns CL = 15pF, See Figures 4 and 6, S1 closed -0.2 0.2 Volts SP483E Receiver DC Characteristics Differential input threshold Input hysteresis Output voltage HIGH 20 mV VCM = 0V Volts VID = 200mV, IO = -4mA Output voltage LOW 0.4 Volts VID = 200mV, IO = 4mA Three-state ( high impedance) output current ±1 µA 0.4V ≤ VO ≤ 2.4V; RE = 5V kΩ -7V ≤ VCM ≤ 12V 1.0 mA DE = 0V, VCC = 0V or 5.25V, VIN = 12V -0.8 mA DE = 0V, VCC = 0V or 5.25V, VIN = -7V 95 mA 0V ≤ VO ≤ VCC Input resistance 3.5 -7V ≤ VCM ≤ 12V 12 15 Input current (A, B); VIN = 12V Input current (A, B); VIN = -7V Short circuit current 7 SP483E Receiver AC Characteristics Maximum data rate 250 kbps RE = 0V, DE = 0V Receiver input to output 250 2000 ns tPLH ; See Figures 3 & 7, RDIFF = 54Ω, CL1 = CL2 = 100pF Receiver input to output 250 2000 ns tPHL ; See Figures 3 & 7, RDIFF = 54Ω, CL1 = CL2 = 100pF ns RDIFF = 54Ω, CL1 = CL2 = 100pF, See Figures 3 and 7 Differential receiver skew |tPHL - tPLH| 100 Receiver enable to output low 45 70 ns CRL = 15pF, Figures 2 & 8; S1 Closed Receiver enable to output high 45 70 ns CRL = 15pF, Figures 2 & 8; S2 Closed Receiver Disable from low 45 70 ns CRL = 15pF, Figures 2 & 8; S1 Closed Receiver Disable from high 45 70 ns CRL = 15pF, Figures 2 & 8; S2 Closed REV 1.0.1 3/11 SP483E Electrical Characteristics, Continued TAMB = TMIN to TMAX and VCC = 5V ±5% unless otherwise noted PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS 50 200 600 ns RE = 5V, DE = 0V Driver enable from shutdown to output high 2000 ns CL = 100pF; See Figures 4 and 6; S2 Closed Driver enable from shutdown to output low 2000 ns CL = 100pF; See Figures 4 and 6; S1 Closed SP483E Shutdown Timing Time to shutdown Receiver enable from shutdown to output high 300 2500 ns CL = 15pF; See Figures 2 and 8; S2 Closed Receiver enable from shutdown to output low 300 2500 ns CL = 15pF; See Figures 2 and 8; S1 Closed 5.25 Volts Power Requirements Supply voltage VCC 4.75 Supply current No load 900 µA RE, DI = 0V or VCC; DE = VCC 600 µA RE = 0V, DI = 0V or 5V; DE = 0V 10 µA DE = 0V, RE = VCC Shutdown mode 1 Environmental and Mechanical Operating Temperture Commercial (_C_) Industrial (_E_) Storage Temperature 0 70 °C -40 85 °C -65 150 °C Package NSOIC (_N) Pin Functions Pin Number Pin Name Description 1 RO Receiver output 8 VCC 2 RE Receiver output enable active LOW RE 2 7 B 3 DE Driver output enable active HIGH DE 3 6 A 4 DI Driver input 5 GND Ground connection 6 A Non-inverting driver output / receiver input 7 B Inverting driver output / receiver input 8 VCC Positive supply 4.75V ≤ Vcc ≤ 5.25V R RO 1 DI 4 D 5 GND SP483E Pinout (Top View) REV 1.0.1 4/11 SP483E Test Circuits A R VOD R 1kΩ S2 B Figure 1: RS-485 Driver DC Test Load Circuit DI A B VCC S1 CRL VOC 1kΩ Test Point Receiver Output CL1 A RDIFF B CL2 Figure 2: Receiver Timing Test Load Circuit RO Output Under Test 15pF 500Ω S1 VCC CL S2 Figure 3: RS-485 Driver/Receiver Timing Test Circuit Figure 4: Driver Timing Test Load #2 Circuit Switching Waveforms f = 100kHz; t R ≤ 10ns; t F ≤ 10ns DRIVER INPUT +3V 1.5V 0V DRIVER OUTPUT B A 1.5V t PLH t PHL VO 1/2VO 1/2VO t DPLH DIFFERENTIAL VO+ OUTPUT 0V VA – VB VO– t DPHL tR tF t SKEW = |t DPLH - t DPHL| Figure 5: Driver Propagation Delays REV 1.0.1 5/11 SP483E Switching Waveforms (Continued) f = 100kHz; t R < 10ns; t F < 10ns +3V DE 1.5V 0V t ZL 5V A, B 1.5V t LZ 2.3V VOL VOH A, B 2.3V 0V Output normally LOW 0.5V Output normally HIGH 0.5V t ZH t HZ Figure 6: Driver Enable and Disable Times A– B f = 100kHz; t R ≤ 10ns ; t F ≤ 10ns VOD2 + VOD2 0V – VOH R VOL 0V INPUT 1.5V 1.5V OUTPUT t PHL t PLH t SKEW = | t PHL- t PLH | Figure 7: Receiver Propagation Delays RE R +3V 0V 5V VIL f = 100kHz; t R ≤ 10ns; t F ≤ 10ns 1.5V 1.5V t ZL 1.5V VIH R 0V 1.5V t LZ Output normally LOW 0.5V Output normally HIGH 0.5V t ZH t HZ Figure 8: Receiver Enable and Disable Times REV 1.0.1 6/11 SP483E Description The SP483E is a half-duplex differential transceiver that meets the requirements of RS-485 and RS-422. Fabricated with a MaxLinear proprietary BiCMOS process, this product requires a fraction of the power of older bipolar designs. The RS-485 standard is ideal for multi-drop applications and 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. Shutdown Mode The SP483E is equipped with a Shutdown mode. To enable the shutdown state, both driver and receiver must be disabled simultaneously. A logic LOW on DE (pin 3) and a Logic HIGH on RE (pin 2) will put the SP483E into Shutdown mode. In Shutdown, supply current will drop to typically 1µA. Drivers The driver outputs of the SP483E are differential outputs meeting the RS-485 and RS-422 standards. The typical voltage output swing with no load will be 0 Volts to 5 Volts. With worst case loading of 54Ω across the differential outputs, the drivers can maintain greater than 1.5V voltage levels. The drivers have an enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differential driver outputs. A logic LOW on the DE (pin 3) will tri-state the driver outputs. The SP483E has internally slew rate limited driver outputs to minimize EMI. The maximum data rate for the SP483E drivers is 250kbps under load. Receivers The SP483E receivers have differential inputs with an input sensitivity as low as ±200mV. Input impedance of the receivers is typically 15kΩ (12kΩ minimum). A wide common mode range of -7V to 12V allows for large ground potential differences between systems. The receivers have a tri-state enable control pin. A logic LOW on RE (pin 2) will enable the receiver, a logic HIGH on RE (pin 2) will disable the receiver. INPUTS OUTPUTS RE DE DI LINE CONDITION A B X 1 1 No Fault 1 0 X 1 0 No Fault 0 1 X 0 X X Z Z X 1 X Fault Z Z Table 1: Transmit Function Truth Table INPUTS OUTPUTS RE DE A-B R 0 0 0 0.2V 1 0 -0.2V 0 0 0 Inputs Open 1 1 0 X Z Table 2: Receive Function Truth Table The SP483E receiver is rated for data rates up to 250kbps. The receivers are equipped with the fail-safe feature. Failsafe guarantees that the receiver output will be in a HIGH state when the input is left unconnected. REV 1.0.1 7/11 SP483E ESD Tolerance The SP483E 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 or 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 IC’s tend to be handled frequently. The IEC61000-4-2, 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 IEC610004-2 is shown on Figure 10. There are two methods within IEC61000-4-2, the Air Discharge method and the Contact Discharge method. 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 RV SW1 DC Power Source SW2 Device Under Test CS R S and RV add up to 330Ω for IEC61000-4-2. Figure 10: ESD Test Circuit for IEC61000-4-2 REV 1.0.1 8/11 SP483E I→ ESD Tolerance (Continued) 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. 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 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. DEVICE PIN TESTED HUMAN BODY MODEL Driver Outputs Receiver Inputs 30A 15A 0A t = 0ns t→ t = 30ns Figure 11: ESD Test Waveform for IEC61000-4-2 For the Human Body Model, the current limiting resistor (RS) and the source capacitor (CS) are 1.5kΩ an 100pF, respectively. For IEC-61000-4-2, the current limiting resistor (RS) and the source capacitor (CS) are 330Ω an 150pF, respectively. The higher CS value and lower RS value in the IEC610004-2 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. IEC61000-4-2 Air Discharge Direct Contact Level ±15kV ±15kV ±8kV 4 ±15kV ±15kV ±8kV 4 Table 1: Transceiver ESD Tolerance Levels REV 1.0.1 9/11 SP483E Mechanical Dimensions NSOIC8 Top View Front View Side View Drawing No: Revision: REV 1.0.1 POD-00000108 A 10/11 SP483E Ordering Information(1) Part Number Operating Temperature Range SP483ECN-L/TR 0°C to 70°C SP483EEN-L/TR -40°C to 85°C Lead-Free Package Yes(2) 8-pin NSOIC Packaging Method Reel Reel NOTE: 1. Refer to www.exar.com/SP483E for most up-to-date Ordering Information. 2. Visit www.exar.com for additional information on Environmental Rating. Revision History Revision Date Description 05 2000 Legacy Sipex Datasheet 1.0.0 02/09/12 1.0.1 2/7/18 Corporate Headquarters: 5966 La Place Court Suite 100 Carlsbad, CA 92008 Tel.:+1 (760) 692-0711 Fax: +1 (760) 444-8598 www.maxlinear.com Convert to Exar Format. Update ordering information. Change ESD specification to IEC61000-4-2. Update to MaxLinear logo. Remove GND from Differential Output Voltage min (page 2). Update format and ordering information table. Truth Tables moved to page 7 description section. Removed obsolete PDIP from mechanicals and mechanical dimensions. High Performance Analog: 1060 Rincon Circle San Jose, CA 95131 Tel.: +1 (669) 265-6100 Fax: +1 (669) 265-6101 Email: serialtechsupport@exar.com www.exar.com The content of this document is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by MaxLinear, Inc.. MaxLinear, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide. Complying with all applicable copyright laws is the responsibility of the user. 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