SP485E

SP481E / SP485E Enhanced Low Power Half-Duplex RS-485 Transceivers • +5V Only • Low Power BiCMOS • Driver / Receiver Enable for Multi-Drop configurations • Low Power Shutdown mode (SP481E) • Enhanced ESD Specifications: +/-5kV Human Body Model +/-15kV IEC1000-4-2 Air Discharge +/-8kV IEC1000-4-2 Contact Discharge • Available in RoHS Compliant, Lead Free Packaging. DESCRIPTION The SP481E and SP485E are a family of half-duplex transceivers that meet 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 +5kV for both Human Body Model and IEC1000-4-2 Air Discharge Method. These devices are pin-to-pin compatible with Exar's SP481 and SP485 devices as well as popular industry standards. As with the original versions, the SP481E and SP485E feature Exar's BiCMOS design allowing low power operation without sacrificing performance. The SP481E and SP485E meet the requirements of the RS-485 and RS-422 protocols up to 10Mbps under load. The SP481E is equipped with a low power shutdown mode. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808  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.........................-0.3V 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 8-pin NSOIC...................................................550mW (derate 6.60mW/ºC above +70ºC) 8-pin PDIP....................................................000mW (derate .8mW/ºC above +70ºC) TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted. ELECTRICAL CHARACTERISTICS TYP. MAX. UNITS CONDITIONS PARAMETERS SP481E/SP485E DRIVER DC Characteristics Differential Output Voltage Differential Output Voltage Differential Output Voltage Change in Magnitude of Driver Differential Output Voltage for Complimentary states Driver Common Mode Output Voltage Input High Voltage Input Low Voltage Input Current Driver Short Circuit Current VOUT = HIGH VOUT = LOW SP481E/SP485E DRIVER AC Characteristics Max. Transmission Rate Driver Input to Output, tPLH Driver Input to Output, tPLH (SP485EMN ONLY) Driver Input to Output, tPHL Driver Input to Output, tPHL (SP485EMN ONLY) Driver Skew Driver Rise or Fall Time MIN. GND 2 .5 Vcc Vcc Vcc 0.2 Volts Volts Volts Volts Unloaded; R = ∞ ; see Figure 1 With Load; R = 50Ω (RS-422); see Figure 1 With Load; R = 27Ω (RS-485); see Figure 1 R = 27Ω or R = 50Ω; see Figure 1 3 2.0 0.8 +/-0 +/-250 +/-250 Volts Volts Volts µA mA mA R = 27Ω or R = 50Ω; see Figure 1 Applies to DE, DI, RE Applies to DE, DI, RE Applies to DE, DI, RE -7V ≤ VO ≤ +12V -7V ≤ VO ≤ +12V 0 20 20 20 20 30 30 30 30 5 3 5 60 80 60 80 0 40 Mbps ns ns ns ns ns ns RE = 5V, DE = 5V; RDIFF = 54Ω, CL = CL2 = 00pF See Figures 3 & 5, RDIFF = 54Ω, CL = CL2 = 00pF See Figures 3 & 5, RDIFF = 54Ω, CL = CL2 = 00pF see Figures 3 and 5, tSKEW = |tDPHL - tDPLH| From 0%-90%; RDIFF = 54Ω CL = CL2 = 100pF; see Figures 3 and 6 SP48E,485E_00_2808 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com 2 TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted. ELECTRICAL CHARACTERISTICS TYP. MAX. UNITS CONDITIONS PARAMETERS AC Characteristics Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from High Driver Disable Time from Low SP481E/SP485E RECEIVER DC Characteristics Differential Input Threshold Differential Input Threshold (SP485EMN ONLY) Input Hysteresis Output Voltage High Output Voltage Low Three-State ( High Impedance) Output Current Input Resistance Input Current (A, B); VIN = 2V Input Current (A, B); VIN = -7V Short Circuit Current SP481E/SP485E RECEIVER AC Characteristics Max. Transmission Rate Receiver Input to Output Receiver Input to Output Differential Receiver Skew |tPHL - tPLH| Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable from LOW Receiver Disable from High MIN. SP481E/SP485E DRIVER (continued) 40 40 40 40 70 70 70 70 ns ns ns ns CL = 100pF, see Figures 4 and 6, S2 closed CL = 100pF, see Figures 4 and 6, S closed CL = 100pF, see Figures 4 and 6, S2 closed CL = 100pF, see Figures 4 and 6, S closed -0.2 -0.4 20 3.5 +0.2 +0.4 Volts Volts mV Volts -7V ≤ VCM ≤ +12V -7V ≤ VCM ≤ +12V VCM = 0V IO = -4mA, VID = +200mV IO = +4mA, VID = +200mV 0.4V ≤ VO ≤ 2.4V; RE = 5V -7V ≤ VCM ≤ +12V DE = 0V, VCC = 0V or 5.25V, VIN = 2V DE = 0V, VCC = 0V or 5.25V, VIN = -7V 0V ≤ VO ≤ VCC 0.4 +/- 2 5 +.0 -0.8 7 95 Volts µA kΩ mA mA mA 0 20 20 45 45 3 45 45 45 45 70 70 70 70 00 00 Mbps ns ns ns ns ns ns ns RE = 0V, DE = 0V tPLH ; See Figures 3 & 7, RDIFF = 54Ω, CL = CL2 = 00pF tPHL ; See Figures 3 & 7, RDIFF = 54Ω, CL = CL2 = 00pF RDIFF = 54Ω, CL = CL2 = 100pF, see Figures 3 and 7 CRL = 15pF, Figures 2 & 8; S Closed CRL = 15pF, Figures 2 & 8; S2 Closed CRL = 15pF, Figures 2 & 8; S Closed CRL = 15pF, Figures 2 & 8; S2 Closed Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 3 TMIN to TMAX and VCC = +5.0V +/-5% unless otherwise noted. ELECTRICAL CHARACTERISTICS TYP. MAX. UNITS CONDITIONS PARAMETERS SP481E Shutdown Timing Time to Shutdown Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Output Low POWER REQUIREMENTS Supply Voltage VCC Supply Current SP481E/SP485E No Load SP481E Shutdown Mode MIN. 50 200 40 40 300 300 600 00 00 000 000 ns ns ns ns ns RE = 5V, DE = 0V CL = 100pF; See Figures 4 and 6; S2 Closed CL = 100pF; See Figures 4 and 6; S Closed CL = 15pF; See Figures 2 and 8; S2 Closed CL = 15pF; See Figures 2 and 8; S Closed +4.75 +5.25 Volts 900 600 0 µA µA µA RE, DI = 0V or VCC; DE = VCC RE = 0V, DI = 0V or 5V; DE = 0V DE = 0V, RE = VCC ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) Industrial (_E_) (_M_) Storage Temperature Package Plastic DIP (_P) NSOIC (_N) 0 -40 -40 -65 70 +85 +25 +50 ºC ºC ºC ºC Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 4 PIN FUNCTION Pin  - RO - Receiver Output Pin 2 - RE - Receiver Output Enable Active LOW Pin 3 - DE - Driver Output Enable Active HIGH Pin 4 DI - Driver Input Pin 5 - GND - Ground Connection Pin 6 - A - Driver Output / Receiver input Non-Inverting Pin 7 - B - Driver Output / Receiver Input Inverting Pin 8 - Vcc - Positive Supply 4.75V ≤ Vcc ≤ 5.25V TEST CIRCUITS A R VOD R B Figure 1. RS-485 Driver DC Test Load Circuit Receiver Output VOC Test Point S1 CRL 1kΩ S2 1kΩ VCC Figure 2. Receiver Timing Test Load Circuit DI A B CL1 RL CL2 A B RO 15pF Output Under Test 500Ω CL S1 VCC S2 Figure 3. RS-485 Driver/Receiver Timing Test Figure 4. Driver Timing Test Load #2 Circuit f ≥ 1MHz; t R ≤ 10ns ; t F ≤ 10ns 1.5V t PLH VO 1/2VO t DPLH t DPHL t PHL 1/2VO 1.5V DRIVER INPUT +3V 0V B A DRIVER OUTPUT DIFFERENTIAL VO+ 0V OUTPUT VA – VB VO– t SKEW = |t DPLH - t DPHL | tR tF Figure 5. Driver Propagation Delays Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 5 FUNCTION TRUTH TABLES INPUTS RE X X X X DE   0  DI  0 X X LINE CONDITION No Fault No Fault X Fault OUTPUTS A 0  Z Z B  0 Z Z INPUTS RE 0 0 0  DE 0 0 0 0 A-B +0.2V -0.2V Inputs Open X OUTPUTS R  0  Z Table 1. Transmit Function Truth Table Table 2. Receive Function Truth Table SWITCHING WAVEFORMS DE +3V 0V 5V VOL VOH 0V 2.3V t ZH f = 1MHz; t R < 10ns; t F < 10ns 1.5V t ZL 2.3V Output nor mally LOW Output nor mally HIGH 1.5V t LZ 0.5V 0.5V t HZ A, B A, B Figure 6. Driver Enable and Disable Times A– B VOD2 + VOD2 – VOH VOL t PHL f = 1MHz; t R ≤ 10ns ; t F ≤ 10ns 0V INPUT 0V R 1.5V OUTPUT t PLH 1.5V Figure 7. Receiver Propagation Delays RE +3V 0V 5V VIL VIH 1.5V f = 1MHz; t ≤ 10ns; t ≤ 10ns R F t ZL 1.5V Output nor mally LOW Output nor mally HIGH 1.5V t LZ 0.5V 0.5V t HZ R R 0V 1.5V t ZH Figure 8. Receiver Enable and Disable Times Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 6 DESCRIPTION The SP481E and SP485E are half-duplex differential transceivers that meet the requirements of RS-485 and RS-422. Fabricated with an Exar 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. Drivers The driver outputs of the SP481E and SP485E 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 of the SP481E and SP485E 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 transmitters of the SP481E and SP485E will operate up to at least 10Mbps. Receivers The SP481E and SP485E 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 of the SP481E and SP485E 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. The receiver for the SP481E and SP485E will operate up to at least 10Mbps. The receiver for each of the two devices is equipped with the fail-safe feature. Failsafe guarantees that the receiver output will be in a HIGH state when the input is left unconnected. Shutdown Mode SP481E The SP481E 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 SP481E into Shutdown mode. In Shutdown, supply current will drop to typically µA. ESD TOLERANCE The SP481E and SP485E 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 305.7 b) IEC1000-4-2 Air-Discharge c) IEC000-4-2 Direct Contact Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 7 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 IEC-000-4-2, 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 IEC1000-4-2 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 IEC1000-4-2 is shown on Figure 10. There are two methods within IEC1000-4-2, the Air Discharge method and the Contact Discharge method. RC SW1 DC Power Source RS SW2 CS Device Under Test Figure 9. ESD Test Circuit for Human Body Model Contact-Discharge Model RC SW1 DC Power Source RS RV SW2 CS Device Under Test R S and RV add up to 330Ω for IEC1000-4-2. Figure 10. ESD Test Circuit for IEC1000-4-2 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 8 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. SP48E, SP485E FAMILY Driver Outputs Receiver Inputs HUMAN BODY MODEL +/-5kV +/-5kV 30A 15A I→ 0A t = 0ns t = 30ns t→ Figure 11. ESD Test Waveform for IEC1000-4-2 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. For the Human Body Model, the current limiting resistor (RS) and the source capacitor (CS) are 1.5kΩ an 100pF, respectively. For IEC-1000-4-2, 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 IEC1000-4-2 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. IEC000-4-2 Air Discharge +/-5kV +/-5kV Direct Contact +/-8kV +/-8kV Level 4 4 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 9 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808 0 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP48E,485E_00_2808  Model Temperature Range Package Types SP48ECN-L....................................................................... 0°C to +70°C ................................................................................................8-pin NSOIC SP48ECN-L/TR ................................................................. 0°C to +70°C ................................................................................................8-pin NSOIC SP48ECP-L....................................................................... 0°C to +70°C................................................................................................8-pin PDIP SP48EEN-L/.................................................................... -40°C to +85°C...............................................................................................8-pin NSOIC SP48EEN-L/TR................................................................. -40°C to +85°C.............................................................................................8-pin NSOIC SP48EEP-L....................................................................... -40°C to +85°C.............................................................................................8-pin PDIP SP485ECN-L....................................................................... 0°C to +70°C ................................................................................................8-pin NSOIC SP485ECN-L/TR ................................................................. 0°C to +70°C ................................................................................................8-pin NSOIC SP485ECP-L....................................................................... 0°C to +70°C.................................................................................................8-pin PDIP SP485EEN-L..................................................................... -40°C to +85°C................................................................................................8-pin NSOIC SP485EEN-L/TR................................................................ -40°C to +85°C...............................................................................................8-pin NSOIC SP485EEP-L...................................................................... -40°C to +85°C...............................................................................................8-pin PDIP SP485EMN-L..................................................................... -40°C to +85°C...............................................................................................8-pin NSOIC SP485EMN-L/TR............................................................... -40°C to +85°C...............................................................................................8-pin NSOIC ORDERING INFORMATION Note: /TR = Tape and Reel REVISION HISTORY DATE May /07 2/8/08 REVISION -.0.0 DESCRIPTION Legacy Sipex Datasheet Convert to Exar Format. Update ordering information as a result of discontinued Lead type package options per PDN 081126-01. Remove "Top Mark" information from ordering page. 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 2008 EXAR Corporation Datasheet December 2008 Send your Interface technical inquiry with technical details to: uarttechsupport@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 • 50-668-707 • www.exar.com SP48E,485E_00_2808 2