SP3080E-3088E Advanced-Failsafe RS-485/RS-422 Transceivers 1/8th Unit Load, Slew-Rate Limited, ±15kV ESD-Protected FEATURES • 5.0V single supply operation • Receiver failsafe on open, shorted or terminated lines • 1/8th Unit Load, 256 transceivers on bus • Robust ESD protection for RS-485 pins o ±15kV Air-Gap Discharge o ±15kV Human Body Model o ±8kV Contact Discharge • Controlled driver slew rates o 115kbps, Low EMI (SP3080E, SP3081E, SP3082E) o 500kbps, Low EMI (SP3083E, SP3084E, SP3085E) o High Speed, 20Mbps (SP3086E, SP3087E, SP3088E) •Hot Swap glitch protection on control inputs •Driver short circuit current limit and thermal shutdown for overload protection •Ultra-low 400μA quiescent current •1μA shutdown mode (except SP3081, SP3084, SP3087) •Industry standard package footprints RO 1 RE 2 7 B Vcc 1 8 PIN NSOIC 8 A RO 2 SP3081E SP3084E SP3087E 7 B Full Duplex 5Y DE 3 DI 4 DI 3 GND 4 5 GND 14 Vcc NC 1 14 PIN NSOIC RE 3 SP3080E SP3083E SP3086E GND 7 6 A 6 Z RO 2 DI 5 GND 6 • Motor Control • Building Automation • Security Systems • Remote Meter Reading • Long or un-terminated transmission lines 8 Vcc SP3082E SP3085E SP3088E Half Duplex DE 4 APPLICATIONS 8 PIN NSOIC 13 NC 12 A 11 B 10 Z Full Duplex 9 Y 8 NC DESCRIPTION The SP3080E-SP3088E family of RS-485 devices are designed for reliable, bidirectional communication on multipoint bus transmission lines. Each device contains one differential driver and one differential receiver. The SP3082E, SP3085E and SP3088E are half-duplex devices; other part numbers are full-duplex. All devices comply with TIA/EIA-485 and TIA/EIA-422 standards. Lead-free and RoHS compliant packages are available for all models. These devices are ruggedized for use in harsh operating conditions over the entire common-mode voltage range from -7V to +12V. Receivers are specially designed to fail-safe to a logic high output state if the inputs are left un-driven or shorted. All RS-485 bus-pins are protected against severe ESD events up to ±15kV (Air-Gap and Human Body Model) and up to ±8kV Contact Discharge (IEC 10004-2). Drivers are protected from excess current flow caused by bus contention or output short-circuits by both an internal current limit and a thermal-overload shutdown. Devices are rated for industrial (-40 to +85ºC) operating temperatures. Receivers have exceptionally high input impedance, which places only 1/8th the standard load on a shared bus. Up to 256 transceivers may coexist while preserving full signal margin. All devices operate from a single 5.0V power supply and draw negligible quiescent power. All versions except the SP3081E, SP3084E, and SP3087E may independently enable and disable their driver and receiver and enter a low power shutdown mode if both driver and receiver are disabled. All outputs maintain high impedance in shutdown or when powered-off. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 1 SP3080E-SP3088E_100_062309 DEVICE ARCHITECTURE AND BLOCK DIAGRAMS Devices are available in three industry standard architectures and footprints. In each footprint there are three speed grades available. NC RO 1 2 R 3 RE DE 4 DI GND GND 5 6 7 10 D DI GND RO 2 3 4 1 2 SP3080E, 115kbps slew rate limited SP3083E, 500kbps slew rate limited SP3086E, 20Mbps Z 8-Pin Full Duplex R 8 A 7 B 6 D SP3081E, 115kbps slew rate limited SP3084E, 500kbps slew rate limited SP3087E, 20Mbps Z 5 Y R RE DE 3 DI 4 14-Pin Full Duplex 9 Y 8 NC VCC 1 RO 14 VCC 13 NC 12 A 11 B D 8-Pin Half Duplex 8 VCC SP3082E, 115kbps slew rate limited SP3085E, 500kbps slew rate limited SP3088E, 20Mbps 7 B 6 A 5 GND Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 2 SP3080E-SP3088E_100_062309 PIN ASSIGNMENTS Pin Number Full-Duplex Half Duplex SP3080E SP3081E SP3082E SP3083E SP3084E SP3085E SP3086E SP3087E SP3088E 2 3 4 2 - - 1 2 3 Pin Name Pin Function RO Receiver Output. When RE is low and if (A – B) ≥ -40mV, RO is high. If (A – B) ≤ - 200mV, RO is low. RE Receiver Output Enable. When RE is low, RO is enabled. When RE is high, RO is high impedance. Drive RE high and DE low to enter shutdown mode. RE is a hot-swap input. REREE DE Driver Output Enable. When DE is high, outputs are enabled. When DE is low, outputs are high impedance. Drive DE low and RE high to enter shutdown mode. DE is a hot-swap input. Driver Input. With DE high, a low level on DI forces non-inverting output low and inverting output high. A high level on DI forces noninverting output high and inverting output low. 5 3 4 DI 6, 7 4 5 GND Ground 9 5 - Y Non-inverting Driver Output 10 6 - Z Inverting Driver Output 11 7 - B Inverting Receiver Input - - 7 B Inverting Receiver Input and Inverting Driver Output 12 8 - A Non-inverting Receiver Input - - 6 A Non-inverting Receiver Input and Non-inverting Driver Output 14 1 8 VCC 1, 8, 13 - - NC Positive Supply VCC. Bypass to GND with a 0.1uF capacitor. No Connect, not internally connected Note: On 14-pin packages connect both pins 6 and 7 to Ground. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 3 SP3080E-SP3088E_100_062309 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. Supply Voltage (VCC).......................................................+ 7.0V Input voltage at control input pins (RE, DE)... -0.3V to Vcc+0.3V Driver input voltage (DI) ..............................-0.3V to Vcc+0.3V Driver output voltage (A, B, Y, and Z) ............................+/-13V Receiver output voltage (RO) ..................-0.3V to (Vcc + 0.3V) Receiver input voltage (A, B) .........................................+/-13V Package Power Dissipation: Maximum Junction Temperature 150°C 8-Pin SO Θja = 128.4°C/W 14-Pin SO Θja = 86°C/W Storage Temperature.......................................-65°C to +150°C Lead Temperature (soldering, 10s)............................... +300°C RECOMMENDED OPERATING CONDITIONS Vcc=5V ±5%, Tmin to Tmax, unless otherwise noted, Typical values are Vcc=5V and Ta=25°C Recommended Operating Conditions Min. Nom. Max. Unit Supply Voltage, Vcc 4.5 5 5.5 V Input Voltage on A and B pins -7 12 V High-level input voltage (DI, DE or RE), Vih 2 Vcc V Low-level input voltage (DI, DE or RE), Vih 0 0.8 V Driver -60 60 Receiver -8 8 Output Current Signaling Rate, 1/tui Operating Free Air Temperature, Ta SP3080, SP3081, SP3082 0.115 SP3083, SP3084, SP3085 0.5 SP3086, SP3087, SP3088 20 Industrial Grade (E) -40 85 mA Mbps °C Note: The least positive (most negative) limit is designated as the maxium value. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 4 SP3080E-SP3088E_100_062309 ELECTRICAL CHARACTERISTICS PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Digital Input Signals: DI, DE, RE Logic input thresholds High, Vih 2.0 Low, Vil 0.8 Logic Input Current Ta = 25°C, after first transition ±1 Input Hysteresis Ta = 25°C 100 V μA mV Driver Differential Driver Output (Vod) Differential Driver Output, Test 1 No Load Vcc Rl=100Ω (RS-422) 2 Rl=54Ω (RS-485) 1.5 Differential Driver Output, Test 2 Vcm = -7 to +12V 1.5 Change in Magnitude of Differential Output Voltage (ΔVod) (Note 1) Rl=54 or 100Ω Driver Common Mode Output Voltage (Vcc) Rl=54 or 100Ω Change in Common Mode Output Voltage (ΔVoc) Driver Short Circuit Current Limit Output Leakage Current (Full-duplex versions, Y & Z pins) Note 2 V Vcc 2.7 Vcc V Vcc ±0.2 V 3 V Rl=54 or 100Ω ±0.2 V -7V ≤ Vout ≤ +12V (Note 5) ±250 mA DE=0, Vout=12V 125 RE=0, Vcc=0 or 5.5V Vout= -7V 1 μA -100 Receiver Receiver Input Resistance -7V ≤ Vcm ≤ 12V Input Current (A, B pins) DE=0, RE=0, Vcc=0 or 5.5V Receiver Differential Threshold (VA-VB) -7V ≤ Vcm ≤ 12V 96 Vin= -7V 125 -100 -200 Receiver Input Hysteresis Receiver Output Voltage KΩ Vin= 12V μA -125 -40 25 mV mV Voh Iout = -8mA, Vid = -40mV Vcc-1.5 V Vol Iout = 8mA, Vid = -200mV 0.4 High-Z Receiver Output Current Vcc =5.5V, 0 ≤ Vout ≤ Vcc ±1 μA Receiver Output Short Circuit Current 0V ≤ Vro ≤ Vcc ± 95 mA 900 μA 1 μA Supply and Protection Supply Current IQ, Active Mode No load, DI=0 or Vcc Shutdown Mode DE=0, RE=Vcc, DI=Vcc Thermal Shutdown Temperature Junction temperature Thermal Shutdown Hysteresis 400 165 15 o C Notes: 1. Change in Magnitude of Differential Output Voltage and Change in Magnitude of Common Mode Output Voltage are the changes in output voltage when DI input changes state. 2. Except devices which don’t have DE or RE inputs. 3. The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns the device does not enter shutdown. If the enable inputs are held in this state for at least 600ns the device is assured to be in shutdown. In this low power mode most circuitry is disabled and supply current is typically 1nA. 4.Characterized, not 100% tested. 5. See Driver Short Circuit Limit Test Circuit. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 5 SP3080E-SP3088E_100_062309 TIMING CHARACTERISTICS Unless otherwise noted Vcc= +5.0±0.5V, ambient temperature TA from -40 to +85ºC SP3080E, SP3081E, SP3082E Conditions Min. Typ. Max. Unit DRIVER CHARACTERISTICS: Data Signaling Rate (1 / tUI) Duty Cycle 40 to 60% 115 Driver Propagation Delay (tPHL, tPLH) RL = 54Ω, CL = 50pF, 500 Driver Output Rise/Fall Time (tR, tF) Kbps 2600 ns ±200 ns Driver Differential Skew (tPLH – tPHL) Driver Enable to Output High (tDZH) ns 667 1200 2500 3500 ns Driver Enable to Output Low (tDZL) SP3080E, SP3081E 3500 ns Driver Disable from Output High (tDHZ) 100 ns Driver Disable from Output Low (tDLZ) 100 ns Shutdown to Driver Output Valid (tDZV) 6000 ns SP3083E, SP3084E, SP3085E Conditions Min. Typ. Max. Unit DRIVER CHARACTERISTICS: Data Signaling Rate (1/ tUI) Duty Cycle 40 to 60% 500 Driver Propagation Delay (tPHL, tPLH) RL = 54Ω, CL = 50pF, 250 Driver Output Rise/Fall Time (tR, tF) 200 Kbps 1000 530 Driver Differential Skew (tPLH – tPHL) Driver Enable to Output High (tDZH) SP3083E, SP3084E ns ±100 ns 2500 ns Driver Enable to Output Low (tDZL) 2500 ns Driver Disable from Output High (tDHZ) 100 ns Driver Disable from Output Low (tDLZ) 100 ns Shutdown to Driver Output Valid (tDZV) 4500 ns SP3086E, SP3087E, SP3088E DRIVER CHARACTERISTICS: Data Signaling Rate (1 / tUI) Conditions Duty Cycle 40 to 60% Driver Propagation Delay (tPHL, tPLH) RL = 54Ω, CL = 50pF, Min. Typ. Max. Unit 20 Driver Output Rise/Fall Time (tR, tF) Mbps 12 20 6 10 ns ±5 ns Driver Differential Skew (tPLH – tPHL) Driver Enable to Output High (tDZH) SP3086E, SP3087E ns 150 ns Driver Enable to Output Low (tDZL) 150 ns Driver Disable from Output High (tDHZ) 50 ns Driver Disable from Output Low (tDLZ) 50 ns Shutdown to Driver Output Valid (tDZZV) 250 ns Receiver CHARACTERISTICS: Receiver Prop. Delay SP3080E - SP3085E Conditions Min. Typ. Max. Unit 200 ns Receiver Prop. Delay SP3086E - SP3088E 75 ns Prop. Delay Skew SP3080E-SP3085E ±30 ns Prop. Delay Skew SP3086E-SP3088E ±5 ns 15 ns Receiver Enable to Output High (tZH) 50 ns Receiver Enable to Output Low (tZL) 50 ns Receiver Disable from High (tHZ) 50 ns Receiver Disable from Low (tLZ) 50 ns 3500 ns 600 ns Receiver Output Rise/Fall Time CL = 15pF, VID = ±2V, 75 CL = 15pf Shutdown to Receiver Output Valid (tROV) Time to Shutdown (Note 2,3,4) ns 750 50 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 6 200 SP3080E-SP3088E_100_062309 TYPICAL PERFORMANCE CHARACTERISTICS 700 325 DE = Vcc Shutdown Current (nA) No-Load Supply Current (uA) 350 300 275 250 DE = GND 225 200 -60 -40 -20 0 20 40 60 80 650 600 550 500 100 -60 -40 -20 0 Temperature (ºC) No-Load Supply Current vs Temperature 60 80 100 1000 No Load VCC=5V TA=25ºC 50% Square wave input No Load VCC=5V Driver and Receiver 10 TA=25ºC 50% Square wave input 100 Supply Current (mA) 100 Supply Current (mA) 40 Shutdown Current vs Temperature 1000 Driver and Receiver 10 1 1 Receiver Receiver 0.1 0.1 1 10 100 1000 1 10 Signaling Rate (kbps ) 1000 Supply Current vs Signaling Rate (SP3083 - SP3085) 100 100 No Load VCC=5V TA=25ºC 50% Square wave input 90 80 Output Current (mA) 10 100 Signaling Rate (kbps ) Supply Current vs Signaling Rate (SP3080-SP3082) Supply Current (mA) 20 Tem perature (ºC) Driver and Receiver 1 70 60 50 40 30 20 Receiver 10 0.1 1 10 100 1000 10000 0 100000 0 Signaling Rate (kbps ) 1 2 3 4 5 6 Output Low Voltage (V) Supply Current vs Signaling Rate (SP3086-SP3088) Output Current vs Driver Output Low Voltage Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 7 SP3080E-SP3088E_100_062309 TYPICAL PERFORMANCE CHARACTERISTICS -120 100 10 -80 Output Current (mA) Output Current (mA) -100 -60 -40 1 0.1 -20 0 0.01 -2 0 2 4 0 6 1 2 4 5 6 Driver Output Current vs Differential Output Voltage Output Current vs Driver Output High Voltage 0.35 3.4 IOUT=8m A, VID=-200m V 3.2 0.3 R L =100Ω 3 Output Low Voltage (V) Output Voltage (V) 3 Dif f erential Output Voltage (V) Output High Voltage (V) 2.8 2.6 R L=54Ω 2.4 0.25 0.2 0.15 2.2 0.1 -60 2 -60 -40 -20 0 20 40 60 80 100 -40 Driver Differential Output Voltage vs Temperature Receiver Output Voltage (V) 3.9 Output High Voltage (V) 20 40 60 80 100 5 IOUT=8m A, VID=-40m V 3.8 3.7 3.6 4 VCC=5V TA=25ºC 3 2 1 0 -40 -20 0 20 40 60 80 -200 -180 -160 -140 -120 -100 100 -80 -60 -40 -20 0 Differential Input Voltage (m V) Temperature (º C) Receiver Output Voltage vs Differential Input Voltage Receiver Output High Voltage vs Temperature 0 Receiver Output Low Voltage vs Temperature 4 3.5 -60 -20 Temperature (º C) Tem perature (ºC) Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 8 SP3080E-SP3088E_100_062309 TYPICAL PERFORMANCE CHARACTERISTICS 60 960 950 Propagation Delay (ns) Output Current (mA) 50 40 30 20 R L=54Ω,C L=50pF 940 930 920 910 900 890 10 880 870 -60 0 0 1 2 3 4 5 -40 -20 40 60 80 100 435 R L=54Ω,CL=50pF 950 R L=54Ω,C L=50pF 430 940 Propagation Delay (ns) Propagation Delay (ns) 20 Driver Average Propagation Delay vs Temperature (SP3080-SP3082) Output Current vs Receiver Output Low Voltage 960 0 Temperature (º C) Output Low Voltage (V) 930 tPLH 920 910 900 tPHL 890 425 420 415 880 870 -60 -40 -20 0 20 40 60 80 410 -60 100 -40 -20 Temperature (ºC) 0 20 40 60 80 100 Temperature (º C) Driver Propagation Delay vs Temperature (SP3080-SP3082) Driver Average Propagation Delay vs Temperature (SP3083-SP3085) 35 460 30 450 25 440 Propagation Delay (ns) Output Current (mA) R L=54Ω,C L=50pF 20 15 10 tPLH 430 420 410 tPHL 5 400 0 0 1 2 3 4 390 -60 5 -40 -20 0 20 40 60 80 100 Temperature (º C) Output High Voltage (V) Output Current vs Receiver Output High Voltage Driver Propagation Delay vs Temperature (SP3083-SP3085) Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 9 SP3080E-SP3088E_100_062309 TYPICAL PERFORMANCE CHARACTERISTICS 15 120 R L=54Ω,C L=50pF C L=15pF, VID=±2V 110 13 tPLH Propagation Delay (ns) Propagation Delay (ns) 14 12 11 tPHL 10 9 100 90 80 8 -60 -40 -20 0 20 40 60 80 100 70 -60 Tem perature (ºC) -40 -20 0 20 40 60 80 100 Temperature (º C) Driver Propagation Delay vs Temperature (SP3086-SP3088) Receiver Average Propagation Delay vs Temperature (SP3080-SP3082) 120 155 C L=15pF, VID=±2V 150 110 100 145 Propagation Delay (ns) Propagation Delay (ns) C L=15pF, VID=±2V tPHL 90 tPLH tPHL 140 135 130 tPLH 125 80 120 70 -60 -40 -20 0 20 40 60 80 115 -60 100 -40 -20 Temperature (ºC) 40 60 80 100 Receiver Propagation Delay vs Temperature (SP3080-SP3082) Receiver Propagation Delay vs Temperature (SP3083-SP3085) 13.5 55 R L=54Ω,C L=50pF 53 C L=15pF, VID=±2V 51 12.5 Propagation Delay (ns) Propagation Delay (ns) Propagation Delay (ns) 20 Temperature (º C) 13 12 11.5 11 49 47 tPHL 45 43 tPLH 41 39 10.5 10 -60 37 -40 -20 0 20 40 60 80 35 -60 100 -40 -20 0 20 40 60 80 100 Temperature (º C) Temperature (º C) Receiver Propagation Delay vs Temperature (SP3086-SP3088) Driver Average Propagation Delay vs Temperature (SP3086-SP3088) 0 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 10 SP3080E-SP3088E_100_062309 TYPICAL PERFORMANCE CHARACTERISTICS Driver Propagation Delay (SP3080-SP3082) Driver and Receiver Hot Swap Performance vs. Vcc 54 C L =15pF, V Propagation Delay (ns) 52 ID =±2V 50 48 46 44 Propagation Delay (ns) 42 40 -60 -40 -20 0 20 40 60 80 100 Temperature (ºC) Receiver Average Propagation Delay vs Temperature (SP3086-SP3088) Driver output Waveform Low to High (SP3080-SP3082) Driver output Waveform High to Low (SP3080-SP3082) Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 11 SP3080E-SP3088E_100_062309 TYPICAL PERFORMANCE CHARACTERISTICS Driver Propagation Delay (SP3083-SP3085) Driver and Receiver Waveform High to Low (SP3080-SP3082) Driver Output Waveform High to Low (SP3083-SP3085) Driver Output Waveform Low to High (SP3083-SP3085) Driver and Receiver Waveform Low to High (SP3083-SP3085) Driver and Receiver Waveform Low to High (SP3080-SP3082) Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 12 SP3080E-SP3088E_100_062309 TYPICAL PERFORMANCE CHARACTERISTICS Driver Propagation Delay (SP3086-SP3088) Driver Output Waveform Low to High (SP3086-SP3088) Driver Output Waveforms High to Low (SP3086-SP3088) Driver and Receiver Waveform Low to High (SP3086-SP3088) Driver and Receiver Waveform High to Low (SP3086-SP3088) Driver and Receiver Waveform High to Low (SP3083-SP3085) Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 13 SP3080E-SP3088E_100_062309 TYPICAL PERFORMANCE CHARACTERISTICS Receiver Propagation Delay (SP3086-SP3088) Receiver Propagation Delay (SP3080-SP3082) Receiver Propagation Delay (SP3083-SP3085) Test Circuits A R/2 DI VCC D VID VOD OUT RE R/2 VOC Receiver DC Test Circuit Driver DC Test Circuit B R Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 14 SP3080E-SP3088E_100_062309 Test Circuits DI RL 54Ω Y D VOD CL 50pF Z 3.3V Driver Propagation Delay Time Test Circuit and Timing Diagram DI Vcc Z Y VDIFF VY – VZ Vcc/2 0V Vcc/2 t PLH t PHL VO 1/2VO 1/2VO t DPLH VO+ 0V VO– t DPHL 90% 10% tF 90% 10% tR t SKEW = |t DPLH - t DPHL| Driver Short Circuit Current Limit Test Circuit DE = 0 or Vcc DI = 0 or Vcc A/Y IOSD D B/Z 100Ω -7V to +12V V Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 15 SP3080E-SP3088E_100_062309 Test Circuits Driver Differential Output Test Circuit DE = 3.3V DI = 0 or Vcc 375Ω A/Y D 60Ω VOD B/Z 375Ω VCM Driver Enable and Disable Times Test Circuit and Timing Diagram Y 0 or Vcc DI OUT Z GENERATOR S1 D CL = 50pF RL = 500Ω 50Ω Vcc DE Vcc/2 0 t ZL, t ZL(SHDN) OUT 0.25V VOM = (VOL + Vcc)/2 t LZ Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 16 0 SP3080E-SP3088E_100_062309 Test Circuits Driver Enable and Disable Times Test Circuit and Timing Diagram Vcc RL = 500Ω Y 0 or Vcc DI D OUT Z GENERATOR S1 CL = 50pF 50Ω Vcc/2 DE Vcc 0 tZL, tZL(SHDN) t LZ Vcc OUT VOM = (VOL + Vcc)/2 VOL 0.25V Receiver Propagation Delay Test Circuit and Timing Diagram A VID R B RE OUT CL 15pF +1V A B OUT t PHL 1.5V t PLH -1V VOH VOL Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 17 SP3080E-SP3088E_100_062309 Test Circuits Receiver Enable and Disable Times Test Circuit S3 1.5V -1.5V S1 B A R S2 RE GENERATOR Vcc 1kΩ CL= 15pF 50Ω Receiver Enable and DisableTiming Diagram S1 is open, S2 is closed, S3 = 1.5V 3V 1.5V RE S1 is closed, S2 is open, S3 = -1.5V 3V 1.5V RE 0V t ZL,t ZL(SHDN) t ZH, t ZH(SHDN) VOH OUT VOH /2 VCC VOL= VCC /2 OUT VOL 0V S1 is open, S2 is closed, S3 = 1.5V S1 is closed, S2 is open, S3 = -1.5V 3V RE 3V 1.5V RE tHZ 0.25V OUT 1.5V t LZ VOH 0V VCC OUT 0V 0.25V Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 18 VOL SP3080E-SP3088E_100_062309 FUNCTION TABLES SP3080E, SP3083E, SP3086E (Full Duplex) Transmitting Receiving Inputs Inputs Outputs RE DE DI Y Z RE DE X 1 1 1 0 0 X 1 0 0 1 0 0 X 1 0 X Output RO X VA - VB ≥ -40mV 1 0 X ≤-200mV 0 High-Z 0 X Open/shorted 1 Shutdown 1 1 X High-Z 1 0 X Shutdown SP3081E SP3084E, SP3087E (Full Duplex) Receiving Transmitting Input Outputs DI Y Z 1 1 0 0 0 1 Open 1 0 Inputs Output VA - VB RO ≥ -40mV 1 ≤-200mV 0 Open/shorted 1 SP3082E SP3085E, SP3088E (Half Duplex) Transmitting RE X X 0 1 Inputs DE 1 1 0 0 Receiving Outputs DI 1 0 X X A 1 0 Inputs B 0 1 High-Z Shutdown Output RE DE VA - VB RO 0 X ≥ -40mV 1 0 X ≤-200mV 0 0 X Open/shorted 1 1 1 X High-Z 1 0 X Shutdown Note: Receiver inputs -200mV < VA - VB < -40mV, should be considered indeterminate PRODUCT SELECTOR GUIDE Part Number Duplex Data Rate (Mbps) Shut-down Receiver & Trans on Bus Foot-print Driver Enable SP3080E Full 0.115 Yes Yes 256 SN75180 SP3081E Full 0.115 No No 256 SN75179 MAX3081 SP3082E Half 0.115 Yes Yes 256 SN75176 SP483, MAX3082 SP3083E Full 0.5 Yes Yes 256 SN75180 MAX3083 SP3084E Full 0.5 No No 256 SN75179 MAX3084 SP3085E Half 0.5 Yes Yes 256 SN75176 MAX3085 SP3086E Full 20 Yes Yes 256 SN75180 SP1491, MAX3086 SP3087E Full 20 No No 256 SN75179 SP1490, MAX3087 SP3088E Half 20 Yes Yes 256 SN75176 SP1481, MAX3088 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 19 pin-compatible upgrade from: MAX3080 SP3080E-SP3088E_100_062309 DESCRIPTION DETAILED DESCRIPTION SP3080E-SP3088E is a family of advanced RS-485/RS-422 transceivers. Each contains one driver and one receiver. These devices feature fail-safe circuitry that guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled. SP3080E, SP3082E, SP3083E, SP3085E, SP3086E and SP3088E also feature a hot-swap capability allowing live insertion without error data transfer. The receiver thresholds of the SP3080E family, are very precise and offset by at least a 40mV noise margin from ground. This results in a logic-high receiver output at zero volts input differential while maintaining compliance with the EIA/TIA-485 standard of ±200mV. HOT-SWAP CAPABILITY When a micro-processor or other logic device undergoes its power-up sequence its logicoutputs are typically at high impedance. In this state they are unable to drive the DE and signals to a defined logic level. During this period, noise, parasitic coupling or leakage from other devices could cause standard CMOS enable inputs to drift to an incorrect logic level. The SP3080E, SP3081E and SP3082E feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 115kbps. The SP3083E, SP3084E and SP3085E also offer slew-rate limits allowing transmit speeds up to 500kbps. The SP3086E, SP3087E, SP3088E driver slew rates are not limited, making transmit speeds up to 20Mbps possible. If circuit boards are inserted into an energized backplane (commonly called “live insertion” or “hot-swap”) power may be suddenly applied to all circuits. Without the hot-swap capability, this situation could improperly enable the transceiver’s driver or receiver, driving invalid data onto shared busses and possibly causing driver contention or device damage. The SP3082E, SP3085E and SP3088E are half-duplex transceivers, while the SP3080E, SP3081E, SP3083E, SP3084E, SP3086E, and SP3087E are full duplex transceivers. The SP3080E family contains a special poweron-reset circuit that holds DE low and RE high for approximately 10 microseconds. After this initial power-up sequence the hot-swap circuit becomes transparent, allowing for normal, unskewed enable and disable timings. All devices operate from a single 5.0V supply. Drivers are output short-circuit current limited. Thermal-shutdown circuitry protects drivers against excessive power dissipation. When activated, the thermal-shutdown circuitry places the driver outputs into a high-impedance state. ±15KV ESD PROTECTION ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver output and receiver inputs of the SP3080E family have extra protection against static electricity. Exar uses state of the art structures to protect these pins against ESD of ±15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, the SP3080E - SP3088E keeps working without latch-up or damage. RECEIVER INPUT FILTERING SP3080E-SP3085E receivers incorporate input filtering in addition to input hysteresis. This filtering enhances noise immunity with differential signals that have very slow rise and fall times. Receiver propagation delay increases due to this filtering. ADVANCED FAIL SAFE Ordinary RS485 differential receivers will be in an indeterminate state whenever A - B is less than ±200mV. This situation can occur whenever the data bus is not being actively driven. The Advanced Failsafe feature of the SP3080E family guarantees a logic-high receiver output if the receiver’s differential inputs are shorted, open-circuit, or if they are shunted by a termination resistor. ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 20 SP3080E-SP3088E_100_062309 DESCRIPTION the SP3080E - SP3088E are characterized for protection to the following limits: ±15kV using the Human Body Model ±8kV using the Contact Discharge method specified in IEC 1000-4-2 ±15kV Air-gap LOW POWER SHUTDOWN MODE Low-power shutdown mode is initiated by bringing both RE high and DE low simultaneously. While in shutdown devices typically draw only 50nA of supply current. DE and RE may be tied together and driven by a single control signal. Devices are guaranteed not to enter shutdown if RE is high and DE is low for less than 50ns. If the inputs are in this state for at least 600ns, the parts are shutdown. ESD TEST CONDITIONS ESD performance depends on a variety of conditions. Contact Exar for a reliability report that documents test setup, methodology and results. Enable times tZH and tZL apply when the part is not in low-power shutdown state. Enable times tZH(SHDN) and tZL(SHDN) apply when the parts are shut down. The drivers and receivers take longer to become enabled from low power shutdown mode tZL(SHDN) and tZL(SHDN) than from driver/receiver-disable mode (tZH, tZL). IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment. However, it does not specifically refer to integrated circuits. The SP3080E family helps you design equipment to meet IEC 1000-4-2, without sacrificing board space and cost for external ESDprotection components. DRIVER OUTPUT PROTECTION Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. First, a driver-current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range. Second, a thermalshutdown circuit forces the driver outputs into a high-impedance state if junction temperature becomes excessive. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is a higher peak current in IEC 1000-4-2 series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to IEC 1000-4-2 is generally lower than that measured using the human body model. The air-gap test involves approaching the device with a charged probe. The contact discharge method connects the probe to the device before the probe is energized. LINE LENGTH, EMI, AND REFLECTIONS SP3080E - SP3085E feature controlled slewrate drivers that minimize EMI and reduce reflections caused by improperly terminated cables. MACHINE MODEL The machine model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. The objective is to emulate the stress caused when I/O pins are contacted by handling equipment during test and assembly. SP3080E - SP3083E driver rise and fall times are limited to no faster than 667ns, allowing error-free data transmission up to 115kbps. The SP3083, SP3084 and SP3085 offer somewhat higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. 256 TRANSCEIVERS ON THE BUS The standard RS-485 receiver input impedance is 12kΩ (1 unit load). A standard driver can drive up to 32 unit loads. The SP3080E family of transceivers has only a 1/8th unit load receiver input impedance (96kΩ), thereby allowing eight times as many, up to 256, transceivers to be connected in parallel on a communication line. Any combination of these devices and other RS-485 transceivers up to a total of 32 unit loads may be connected to the line. The RS-485/RS-422 standard covers line lengths up to 4,000ft. Maximum achievable line length is a function of signal attenuation and noise. Use of slew-controlled drivers such as the SP3080E-SP3086E may help to reduce crosstalk interference and permit communication over longer transmission lines. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 21 SP3080E-SP3088E_100_062309 DESCRIPTION Termination prevents reflections by eliminating the impedance mismatches on a transmission line. Line termination is typically used if rise and fall times are shorter than the round-trip signal propagation time. Slew-limited drivers may reduce or eliminate the need for cable termination in many applications. Typical ApplicationS: Half-Duplex Network H alf -D uplex N etw ork Full-Duplex Network Network BBi-Directional i-Directional Full-Duplex Point to Multi-Point Repeater Po int to Multi -point with Repeater RRepeater epeater (optional) (optional) Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 22 SP3080E-SP3088E_100_062309 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 23 SP3080E-SP3088E_100_062309 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com 24 SP3080E-SP3088E_100_062309 ORDERING INFORMATION Part number LEAD FREE Tape & Reel Temperature range Package Type SP3080EEN -L /TR From -40 to +850C 14 pin nSOIC SP3081EEN -L /TR From -40 to +85 C 8 pin nSOIC SP3082EEN -L /TR From -40 to +850C 8 pin nSOIC SP3083EEN -L /TR From -40 to +85 C 14 pin nSOIC SP3084EEN -L /TR From -40 to +85 C 8 pin nSOIC SP3085EEN -L /TR From -40 to +85 C 8 pin nSOIC SP3086EEN -L /TR From -40 to +85 C 14 pin nSOIC SP3087EEN -L /TR From -40 to +850C 8 pin nSOIC SP3088EEN -L /TR From -40 to +85 C 8 pin nSOIC 0 0 0 0 0 0 All packages are available as lead free (RoHS compliant). To order add “-L” suffix to part number. For Tape and Reel add “/TR”. Reel quantity is 2,500 for NSOIC. Example: SP3082EEN-L/TR = lead free and Tape and Reel. SP3082EEN/TR = standard with Tape and Reel. revision history DATE REVISION 2/22/07 M 06/23/09 1.0.0 DESCRIPTION Legacy Sipex Datasheet Convert to Exar Format and Change revision to 1.0.0. 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 2009 EXAR Corporation Datasheet June 2009 Send your Interface technical inquiry with technical details to: [email protected] 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 25 SP3080E-SP3088E_100_062309