SP3070E - SP3078E Family ±15kV ESD-Protected, 3.3V, 1/8 load, Failsafe RS-485/RS422 Transceivers FEaTuRES ■ ±5kV ESD protection for RS485 pins 8 PIN NSOIC RO 1 8 Vcc ■ 3.3V low-power operation SP3072E RE 2 7 B SP3075E ■ Advanced Receiver-failsafe protection for open, shorted or terminated lines DE 3 SP3078E 6 A ■ Up to 256 Transceivers may share Bus DI 4 Half Duplex 5 GND ■ Very low load for 8x greater fanout ■ Hot Swap glitch protection RE and DE 8 PIN NSOIC Vcc 1 8 A ■ Thermal shutdown protects against driver SP3071E RO 2 7 B contention SP3074E ■ Available in three industry standard footprints DI 3 SP3077E 6 Z ■ SP3070E, 3073 and 3076 in Full-Duplex (4 pin) GND 4 Full Duplex 5 Y ■ SP307E, 3074 and 3077 in Full-Duplex (8 pin) ■ SP3072E, 3075 and 3078 in Half-Duplex (8 pin) NC 1 14 Vcc ■ Three applications-optimized speed grades RO 2 14 PIN NSOIC 13 NC ■ SP3070E-72E: 250kbps slew-limited RE 3 SP3070E 12 A ■ SP3073E-75E: 500kbps slew-limited DE 4 SP3073E 11 B ■ SP3076E-78E: 6Mbps high speed DI 5 SP3076E 10 Z ■ Small form factor SO-narrow packages GND 6 9 Y Full Duplex ■ Industrial (-40 to +85ºC) and Extended GND 7 8 NC (-40 to +25ºC) temperature grades Now Available in Lead Free Packaging aPPlICaTIONS ■ Industrial Control, Utility Meters Building Automation, Instrumentation, Point of Sale DESCRIPTION The SP3070E-3078E differential line transceivers are suitable for bidirectional communication on balanced multipoint bus transmission lines and comply with both RS485 and RS422 EIA Standards. Each device consists of a differential driver and differential receiver. All devices operate from a 3.3V power supply. High receiver input impedance allows a large number of transceivers to share a common data bus while maintaining signal margin and without excessive loading or use of expensive repeaters. The high impedance driver output is maintained over the entire common-mode voltage range from -7 to +2V. Receivers will failsafe to logic  output when inputs are open, shorted or terminated. Drivers include built-in short-circuit protection and a thermal-overload shutdown to protect against excessive power dissipation from bus contention or cable faults. All RS485 receiver inputs and driver outputs are ESD protected up to ±5kV (Air-Gap and Human Body Model) and up to ±8kV Contact discharge (IEC 6000-4-2). The SP3070E- SP3078E devices may not achieve optimal transmit performance if the connected receiver includes a biasing network to 5.0V without a termination resistor. Please see Exar Application Note ANI#2 for further details. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 

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 1 1143VNCCC 2 12A 4 Pin Full Duplex: R R 11B 3 SP3070E, 250kbps slew limited REB 4 DE SP3073E, 500kbps slew limited 10 Z D 5 D SP3076E, 6Mbps 6 9 Y GGNNDD 7 8 NC 1 VCC 2 8 A 8 Pin Full Duplex: R R 7 B SP307E, 250kbps slew limited SP3074E, 500kbps slew limited 6 3 Z D D SP3077E, 6Mbps 4 5 Y GND 1 8 VCC 8 Pin Half Duplex: RO R 2 7 SP3072E, 250kbps slew limited RE B DE 3 6 A SP3075E, 500kbps slew limited 4 DI D 5 SP3078E, 6Mbps GND Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 2

aBSOluTE MaXIMuM RaTINGS These are stress ratings only and functional operation of the device at these 8-pin SO (derate 5.88mW/oC above +70oC)................................47mW ratings or any other above those indicated in the operation sections of the 4-pin SO (derate 8.33mW/oC above +70oC).............. .............667mW specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Operating Temperature Ranges VCC.................................................................................................+6.0V SP307XE_MN..............................................................-40ºC to +25ºC Input Voltage at control input pins (RE, DE).........................-0.3V to 6V SP307XE_EN ................................................................-40ºC to +85ºC Driver Input Voltage (RE, DE)...............................................-0.3V to 6V Junction Temperature.................................................................+50ºC Driver Output Voltage (A, B, Y, & Z)....................................-8V to +3V Storage Temperature Range.......................................-65ºC to +50º C Receiver Input Voltage (A, B)..............................................-8V to +3V Lead Temperature (soldering, 0s) ..........................................+300º C Continuous Power Dissipation at T = 70oC A ElECTRICal CHaRaCTERISTICS Unless otherwise noted V = +3.3 ±0.3V, ambient temperature T < T < T . Typical values are at V = 3.3, CC MIN A MAX CC ambient temperature T = +25ºC. The ♦ denotes the specifications which apply over the full operating range un- A less otherwise noted. PARAMETER SYM. MIN. TYP. MAX. UNITS ® CONDITIONS 2 V RL = 100(cid:31) (RS-422), Figure 1 CC Differential Driver Output V 1.5 V V RL = 54(cid:31) (RS-485), Figure 1 OD CC V ® No Load CC Change in Magnitude of (cid:31)V 0.2 V ® RL = 54 or 100(cid:31), Figure 1 Differential Output Voltage OD Driver Common Mode Output V V /2 3 V ® RL = 54 or 100(cid:31), Figure 1 Voltage OC CC Change in Magnitude of Common Mode Output (cid:31)V ±0.2 V RL = 54 or 100(cid:31), Figure 1 OC Voltage Input High Voltage V 2 V ® DE, DI, RE IH Input Low Voltage V 0.8 V DE, DI, RE IL Input Hysteresis V 100 mV ® DE, DI, RE HYS Input Current I -1 1 µA ® DE, DI, RE IN DE, RE Input Impedance First 1 10 k(cid:31) ® First transition will draw more Transition (Hotswap) current (Hotswap) +125 ® V = +12 V Output Leakage (Y and Z) I µA DE = GND IN Full Duplex (A and B) O -100 ® VCC = GND or 3.6V V = -7V IN 0 ±250 Driver Short-Circuit Current I mA -7V (cid:31) V (cid:31)12V, (Figure 4A) OSD -250 0 OUT Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 3

ElECTRICal CHaRaCTERISTICS Unless otherwise noted V = +3.3 ±0.3V, ambient temperature T < T < T . Typical values are at V = 3.3, CC MIN A MAX CC ambient temperature T = +25ºC. The ♦ denotes the specifications which apply over the full operating range un- A less otherwise noted. PARAMETERS SYM MIN TYP MAX UNITS ® CONDITIONS 125 V = +12V Input Current (A and B) DE = GND IN I µA ® Half Duplex A,B V = GND or 3.6 -100 CC V = -7V IN Thermal-Shutdown Threshold T 165 ºC ® TS Thermal Shutdown Hysteresis T 15 ºC ® TSH RECEIVER Receiver Differential Threshold V -200 -125 -50 mV -7V(cid:31)V (cid:31)12V (Sensitivity) TH CM Receiver Input Hysteresis (cid:31)V 15 mV ® Va + Vb = 0V TH Vcc - RO Output High Voltage V V ® I = -1mA OH 0.6 O RO Output Low Voltage V 0.4 V ® I = 1mA OL O Tri-State Output Current at I +/-1 µA ® 0(cid:31)V (cid:31)V Receiver OZR O CC Receiver Input Resistance R 96 k(cid:31) ® -7V (cid:31)V (cid:31)12V IN CM Receiver Output Short-Circuit I ±60 mA 0V (cid:31)V (cid:31)V Current OZR RO CC SUPPLY CURRENT 0.8 1.5 No Load, RE = 0, DE = V CC Supply Current I 0.8 1.5 mA ® No Load, RE = V , DE = V CC CC CC 0.8 1.5 No Load, RE = 0, DE = 0 Supply Current in Shutdown I 0.05 3 µA RE = V , DE = GND mode SHDN CC ESD PROTECTION ±15 Human Body Model ESD Protection for Y, Z, A, and B ±15 kV ® Air Gap (IEC 1000-4-2) ±8 Contact (IEC 1000-4-2) Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 4

DRIVER SWITCHING CHaRaCTERISTICS Unless otherwise noted V = +3.3 ±0.3V, ambient temperature T < T < T . Typical values are at V = 3.3, CC MIN A MAX CC ambient temperature T = +25ºC. A SP3070E, SP3071E & SP3072E Driver Switching Characteristics DRIVER CHARACTERISTICS: Conditions Min. Typ. Max. Unit Data Signaling Rate Duty Cycle 40 to 60% 250 Kbps Driver Propagation Delay (tPHL, tPLH) 250 500 ns RL = 54Ω, CL = 50pF, Driver Output Rise/Fall Time (tR, tF) Figure 2 & 3 350 600 ns Driver Differential Skew (tPLH – tPHL) 200 ns Driver Enable to Output High (tZH) 2500 ns Driver Enable to Output Low (tZL) RL = 500Ω, CL = 50pF, 2500 ns Figure 4 & 5 Driver Disable from Output High (tHZ) 00 ns Driver Disable from Output Low (tLZ) 00 ns Driver Enable from Shutdown to Output Figure 4 5500 ns High (tZH(SHDN)) Driver Enable from Shutdown to Output Figure 5 5500 ns Low (tZL(SHDN)) Time to Shutdown (tSHDN) 50 200 600 ns RECEIVER SWITCHING CHaRaCTERISTICS Unless otherwise noted V = +3.3 ±0.3V, ambient temperature T < T < T . Typical values are at V = 3.3, CC MIN A MAX CC ambient temperature T = +25ºC. A SP3070E, SP3071E & SP3072E Receiver Switching Characteristics RECEIVER CHARACTERISTICS: Conditions Min. Typ. Max. Unit Data Signaling Rate Duty Cycle 40 to 60% 250 Kbps Receiver Propagation Delay (tPLH, tPHL) Cl=15pF, Figure 6 & 7 200 ns Propagation Delay Skew (tPLH, tPHL) 30 ns Receiver Enable to Output High (tZH) Figure 8 50 ns Receiver Enable to Output Low (tZL) Figure 8 50 ns Receiver Disable from Output High (tHZ) Figure 8 00 ns Receiver Disable from Output Low (tLZ) Figure 8 200 ns Receiver Enable from Shutdown to Output Figure 8 4000 ns High Receiver Enable from Shutdown to Output Figure 8 4000 ns Low Time to Shutdown (tSHDN) 50 200 600 ns Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 5

DRIVER SWITCHING CHaRaCTERISTICS Unless otherwise noted V = +3.3 ±0.3V, ambient temperature T < T < T . Typical values are at V = 3.3, CC MIN A MAX CC ambient temperature T = +25ºC. A SP3073E, SP3074E & SP3075E Driver Switching Characteristics DRIVER CHARACTERISTICS: Conditions Min. Typ. Max. Unit Data Signaling Rate Duty Cycle 40 to 60% 500 Kbps Driver Propagation Delay (tPHL, tPLH) 80 800 ns RL = 54Ω, CL = 50pF, Driver Output Rise/Fall Time (tR, tF) Figure 2 & 3 200 800 ns Driver Differential Skew (tPLH – tPHL) 00 ns Driver Enable to Output High (tZH) 2500 ns Driver Enable to Output Low (tZL) RL = 500Ω, CL = 50pF, 2500 ns Driver Disable from Output High (tHZ) Figure 4 & 5 00 ns Driver Disable from Output Low (tLZ) 00 ns Driver Enable from Shutdown to Output Figure 4 4500 ns High (tZH(SHDN)) Driver Enable from Shutdown to Output Figure 5 4500 ns Low (tZL(SHDN)) Time to Shutdown (tSHDN) 50 200 600 ns RECEIVER SWITCHING CHaRaCTERISTICS Unless otherwise noted V = +3.3 ±0.3V, ambient temperature T < T < T . Typical values are at V = 3.3, CC MIN A MAX CC ambient temperature T = +25ºC. A SP3073E, SP3074E & SP3075E Receiver Switching Characteristics RECEIVER CHARACTERISTICS: Conditions Min. Typ. Max. Unit Data Signaling Rate Duty Cycle 40 to 60% 500 Kbps Receiver Propagation Delay (tPLH, tPHL) 200 ns Cl=15pF, Figure 6 & 7 Propagation Delay Skew (tPLH, tPHL) 30 ns Receiver Enable to Output High (tZH) Figure 8 50 ns Receiver Enable to Output Low (tZL) Figure 8 50 ns Receiver Disable from Output High (tHZ) Figure 8 50 ns Receiver Disable from Output Low (tLZ) Figure 8 50 ns Receiver Enable from Shutdown to Output Figure 8 4000 ns High Receiver Enable from Shutdown to Output Figure 8 4000 ns Low Time to Shutdown (tSHDN) 50 200 600 ns Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 6

DRIVER SWITCHING CHaRaCTERISTICS Unless otherwise noted Vcc=+3.3±0.3V, ambient temperature Tmin < Ta < Tmax. Typical values are at Vcc = 3.3, ambient temperature Ta = +25ºC SP3076E, SP3077E & SP3078E Driver Switching Characteristics DRIVER CHARACTERISTICS: Conditions Min. Typ. Max. Unit Data Signaling Rate Duty Cycle 40 to 60% 6 Mbps Driver Propagation Delay (tPHL, tPLH) 50 ns RL = 54Ω, CL = 50pF, Driver Output Rise/Fall Time (tR, tF) Figure 2 & 4 5 ns Driver Differential Skew (tPLH – tPHL) 8 ns Driver Enable to Output High (tZH) 50 ns Driver Enable to Output Low (tZL) RL = 500Ω, CL = 50pF, 50 ns Figure 4 & 5 Driver Disable from Output High (tHZ) 00 ns Driver Disable from Output Low (tLZ) 00 ns Driver Enable from Shutdown to Output Figure 4 800 ns High (tZH(SHDN)) Driver Enable from Shutdown to Output Figure 5 800 ns Low (tZL(SHDN)) Time to Shutdown (tSHDN) 50 200 600 ns RECEIVER SWITCHING CHaRaCTERISTICS Unless otherwise noted Vcc=+3.3±0.3V, ambient temperature Tmin < Ta < Tmax. Typical values are at Vcc = 3.3, ambient temperature Ta = +25ºC SP3076E, SP3077E & SP3078E Receiver Switching Characteristics RECEIVER CHARACTERISTICS: Conditions Min. Typ. Max. Unit Data Signaling Rate Duty Cycle 40 to 60% 6 Mbps Receiver Propagation Delay (tPLH, tPHL) Cl=15pF, Figure 6 & 7, 40 75 ns -40 to +85 ºC Propagation Delay Skew (tPLH, tPHL) 8 ns Receiver Enable to Output High (tZH) Figure 8 60 ns Receiver Enable to Output Low (tZL) Figure 8 60 ns Receiver Disable from Output High (tHZ) Figure 8 50 ns Receiver Disable from Output Low (tLZ) Figure 8 50 ns Receiver Enable from Shutdown to Output Figure 8 3000 ns High Receiver Enable from Shutdown to Output Figure 8 3000 ns Low Time to Shutdown (tSHDN) 50 200 600 ns Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 7

FIGuRE 1. DRIVER DC TEST CIRCuIT FIGuRE 2. RECEIVER DC TEST CIRCuIT A R/2 OUT VID B R DI D VOD 0 or 3V R/2 VOC RE VCC FIGuRE 3. DRIVER PROPaGaTION DElay TIME TEST CIRCuIT aND TIMING DIa- GRaM RL CL Y 54(cid:31) 50pF DI D VOD Z 3.3V V CC V /2 CC DI 0 t t PLH PHL Z V Y O 1/2 V 1/2 V O O V = V(Y) - V(Z) DIFF V O V 10% 90% 90% 10% DIFF -VO tR VSKEW = tPLH - tPHL tF Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 8

FIGuRE 4. DRIVER ENaBlE & DISaBlE TIMES TEST CIRCuIT & TIMING DIaGRaM Y S1 DI 0 or VCC D OUT Z RL = 500W CL = 50pF GENERATOR 50W V CC V /2 CC DE 0 t t ZL, ZL(SHDN V = (V + V )/2 0.25V OM OL CC t LZ OUT 0 FIGuRE 4a. DRIVER CONTENTION TEST DE = 0 or 3V A/Y IOSD DI = 0 or 3V D B/Z 100(cid:31) -7V to +12V V Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 9

FIGuRE 5. DRIVER ENaBlE & DISaBlE TIMES TEST CIRCuIT & TIMING DIaGRaM VCC Y S1 RL = 500W DI 0 or VCC D OUT Z CL = 50pF GENERATOR 50W V CC V /2 CC DE t t 0 ZL, ZL(SHDN VCC OUT tLZ V = (V + V )/2 V OM OL CC 0.25V OL FIGuRE 6. RECEIVER PROPaGaTION DElay TEST CIRCuIT & TIMING DIaGRaM A OUT VID B R CL 15pF RE A +1V B -1V t t PHL PLH V OH 1.5V OUT V OL Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 0

FIGuRE 7. RECEIVER ENaBlE & DISaBlE TIMES TEST CIRCuIT S1 1.5V S3 B 1kW VCC -1.5V A R S2 RE CL = 15pF GENERATOR 50W FIGuRE 8. RECEIVER ENaBlE & DISaBlE TIMING DIaGRaM S1 is closed, S2 is open, S3 = -1.5V S1 is open S2 is closed S3 = 1.5V 3V 3V 1.5V 1.5V RE RE 0V t t ZH, ZH(SHDN) t t ZL, ZL(SHDN) V OH V CC OUT V /2 OH V = V /2 0V OUT OL CC V OL S1 is open S2 is closed S3 = 1.5V S1 is closed, S2 is open, S3 = -1.5V 3V 3V 1.5V 1.5V RE RE tHZ 0V t LZ 0.25V V OH V CC OUT 0V OUT 0.25V V OL Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 

FuNCTION TaBlES SP3070E, SP3073E, SP3076E (Full Duplex) SP3070E, SP3073E, SP3076E (Full Duplex) TRANSMITTING RECEIVING Inputs Outputs Inputs Output RE DE DI Z Y RE DE A, B RO X 1 1 0 1 0 X (cid:31) -50mV 1 X 1 0 1 0 0 X (cid:31)-200mV 0 0 0 X High-Z X X Open, 1 Shorted 1 0 X Shutdown 1 1 X High-Z 1 0 X Shutdown SP3071E, SP3074E, SP3077E (Full Duplex) SP3071E, SP3074E, SP3077E (Full Duplex) TRANSMITTING RECEIVING Inputs Outputs Inputs Output DI Z Y A, B RO 1 0 1 (cid:31) -50mV 1 0 1 0 (cid:31)-200mV 0 Open/shorted 1 SP3072E, SP3075E, SP3078E (Half Duplex) SP3072E, SP3075E, SP3078E (Half Duplex) TRANSMITTING RECEIVING Inputs Outputs Inputs Output RE DE DI B/Z A/Y RE DE A, B RO X 1 1 0 1 0 X (cid:31) -50mV 1 X 1 0 1 0 0 X (cid:31)-200mV 0 0 0 X High-Z X X Open/shorted 1 1 0 X Shutdown 1 1 X High-Z 1 0 X Shutdown Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 2

PIN DESCRIPTION HALF FULL DUPLEX DUPLEX DEVICES DEVICES SP3070E SP3071E SP3072E PIN PIN FUNCTION NAME SP3073E SP3074E SP3075E SP3076E SP3077E SP3078E PIN NUMBER Receiver Output. When RE is low and if (A – B) (cid:31) 2 2 1 RO -50mV, RO is High. If (A – B) (cid:31) - 200mV, RO is low. Receiver Output Enable. When RE is low, RO is enabled. When RE is high, RO is high impedance. RE should be 3 - 2 RE high and DE low to enter shutdown mode. RE is a hot- swap input. Driver Output Enable. When DE is high, outputs are enabled. When DE is low, outputs are high impedance. DE 4 - 3 DE should be 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 noninverting output low and inverting output high. Similarly, 5 3 4 DI a high level on DI forces noninverting output high and inverting output low. 6, 7 4 5 GND Ground 9 5 - Y Noninverting 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 Noninverting Receiver Input Noninverting Receiver Input and Noninverting Driver - - 6 A Output Positive SupplyV . BypassV to GND with a 0.1uF 14 1 8 V CC CC CC capacitor. 1, 8, 13 - - NC No Connect Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 3

DETaIlED DESCRIPTION DETaIlED DESCRIPTION The SP307XE family of high speed trans- to -200mV, RO is logic low. In the case of a ceivers for RS-485/RS-422 communication terminated bus with all transmitters disabled contain one driver and one receiver. These the receiver's differential input voltage is devices feature fail-safe circuitry, which pulled to ZeroV by the termination. With the guarantees a logic-high receiver output when receiver thresholds of the SP3070E family, the receiver inputs are open or shorted, or this results in a logic high with a 50mV mini- when they are connected to a terminated mum noise margin. In compliance with the transmission line with all drivers disabled. The EIA/TIA-485 standard, the SP3070E family SP3070E, SP3072E, SP3073E, SP3075E, has a 50mV - 200mV threshold. SP3076E and SP3078E also feature a hotswap capability allowing live insertion HOT-SWaP CaPaBIlITy without error data transfer. The SP3070E, SP307E and SP3072E feature reduced When circuit boards are inserted into a hot slew-rate drivers that minimize EMI and backplane, differential disturbances to the reduce reflections caused by improperly data bus can lead to data errors. Upon initial terminated cables, allowing error-free data circuit board insertion, the data communica- transmission up to 250kbps. The SP3073E, tion processor undergoes its own power-up SP3074E and SP3075E also offer slew -rate sequence. During this period, the processor's limits allowing transmit speeds up to 500kbps. logic-output drivers are high impedance and The SP3076E, SP3077E, SP3078E driver are unable to drive the DE and RE inputs slew rates are not limited, making transmit of these devices to a defined logic level. speeds up to 6Mbps possible. Leakage currents up to 0µA from the high- impedance state of the processor's logic The SP3072E, SP3075E and SP3078E are drivers could cause standard CMOS enable half-duplex transceivers, while the SP3070E, inputs of a transceiver to drift to an incor- SP307E, SP3073E, SP3074E, SP3076E, rect logic level. Additionally, parasitic circuit and SP3077E are full duplex transceivers. board capacitance could cause coupling of All devices operate from a single 3.3V supply. VCC or GND to the enable inputs. Without Drivers are output short-circuit current limited. the hot-swap capability, these factors could Thermal-shutdown circuitry protects drivers improperly enable the transceiver's driver against excessive power dissipation. When or receiver. activated, the thermal-shutdown circuitry When VCC rises, an internal pulldown circuit places the driver outputs into a high-imped- holds DE low and RE high for approximately ance state. 0 microseconds. After the initial power-up sequence, the pulldown circuit becomes RECEIVER INPuT FIlTERING transparent, resetting the hot-swap toler- able input. SP3070E-SP3075E receivers incorporate input filtering in addition to input hysteresis. This filtering enhances noise immunity with 15KV ESD PROTECTION differential signals that have very slow rise As with all Exar devices, ESD-protection and fall times. Receiver propagation delay structures are incorporated on all pins to increases by 25% due to this filtering. protect against electrostatic discharges encountered during handling and assembly. FaIl SaFE The driver output and receiver inputs of the SP3070E family of devices have extra The SP3070E family guarantees a logic-high protection against static electricity. Exar's receiver output when the receiver inputs are engineering team have developed state shorted, open, or when they are connected of the art structures to protect these pins to a terminated transmission line with all against ESD of 5kV without damage. The drivers disabled. If A - B is less than or equal Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 4

DETAILED DESCRIPTION ESD structures withstand high ESD in all 256 TRaNSCEIVERS ON THE BuS states: normal operation, shutdown, and The standard RS-485 receiver input imped- powered down. After an ESD event, the ance is 12kΩ (1 unit load), and the standard SP3070E - SP3078E keep working without driver can drive up to 32 unit loads. The latchup or damage. SP3070E family of transceivers has a /8- unit load receiver input impedance (96kΩ), ESD protection can be tested in various ways. allowing up to 256 transceivers to be con- The transmitter outputs and receiver inputs of nected in parallel on one communication the SP3070E - SP3078E are characterized line. Any combination of these devices as for protection to the following limits: well as other RS-485 transceivers with a ■ ±5kV using the Human Body Model total of 32 unit loads or fewer can be con- ■ ±8kV using the Contact Discharge method nected to the line. specified in IEC 61000-4-2 ■ ±5kV Airgap REDuCED EMI aND REFlECTIONS The SP3070E, SP307E and SP3072E feature reduced slew-rate drivers that mini- ESD TEST CONDITIONS mize EMI and reduce reflections caused by ESD performance depends on a variety improperly terminated cables, allowing er- of conditions. Contact Exar for a reliability ror-free data transmission up to 250kbps. report that documents test setup, methodol- ogy and results. The SP3073E, SP3074E and SP3075E offer higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. IEC 61000-4-2 The IEC 6000-4-2 standard covers ESD lOW POWER SHuTDOWN MODE testing and performance of finished equip- Low-power shutdown mode is initiated by ment. However, it does not specifically refer bringing both RE high and DE low. In shut- to integrated circuits. The SP3070E family of devices helps you design equipment to down, the devices typically draw only 50nA meet IEC 6000-4-2, without the need for of supply current. additional ESD-protection components. RE and DE can be driven simultaneously; the parts are guaranteed not to enter shut- The major difference between tests done down if RE is high and DE is low for less using the Human Body Model and IEC than 50ns. If the inputs are in this state for 6000-4-2 is higher peak current in IEC at least 600ns, the parts are guaranteed to 6000-4-2, because series resistance is enter shutdown. lower in the IEC 000-4-2 model. Hence, the ESD withstand voltage measured to Enable times t and t assume the part was EC 6000-4-2 is generally lower than that ZH ZL not in a low-power shutdown state. Enable measured using the human body model. times t and t assume the parts ZH(SHDN) ZL(SHDN) The air-gap test involves approaching the were shut down. It takes drivers and receivers device with a charged probe. The contact- longer to become enabled from low-power discharge method connects the probe to the shutdown mode t and t than from ZH(SHDN) ZL(SHDN) device before the probe is energized. driver/receiver-disable mode (t , t ) ZH ZL MaCHINE MODEl DRIVER OuTPuT PROTECTION The machine model for ESD tests all pins Two mechanisms prevent excessive output using a 200pF storage capacitor and zero current and power dissipation caused by discharge resistance. The objective is to faults or by bus contention. First, current emulate the stress caused when I/O pins limit on the ouput stage, provides immedi- are contacted by handling equipment during ate protection against short circuits over the test and assembly. whole common-mode voltage range. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 5

DETaIlED DESCRIPTION Second, a thermal-shutdown circuit, forces To minimize reflections, terminate the line at the driver outputs into a high-impedance both ends in its characteristic impedance, state if the die temperature becomes ex- and keep stub lengths off the main line as cessive. short as possible. The slew-rate-limited SP3070E - SP3075E are more tolerant of lINE lENGTH imperfect termination. The RS-485/RS422 standard covers line lengths up to 4000ft. TyPICal aPPlICaTIONS The SP3072E, SP3075E and SP3078E transceivers are designed for bidirectional data communications on multipoint bus transmission lines. PaRTS SElECTOR GuIDE PART Pin Half/Full Datarate Shut- Receiver Trans. Pin Industry Standard NUMBER Compatible Duplex Mbps down Driver Enable On Bus Count Pinout Upgrade from: SP3070E Full 0.25 Yes Yes 256 14 MAX3070E, 75180 SP3071E Full 0.25 No No 256 8 MAX 3071E, 75179 SP3493 SP3072E Half 0.25 Yes Yes 256 8 MAX 3072E, 75176 SP3483 SP3073E Full 0.5 Yes Yes 256 14 MAX 3073E, 75180 SP3074E Full 0.5 No No 256 8 MAX 3074E, 75179 SP3075E Half 0.5 Yes Yes 256 8 MAX 3075E, 75176 SP3494 SP3076E Full 16 Yes Yes 256 14 MAX 3076E, 75180 SP3491 SP3077E Full 16 No No 256 8 MAX3077E, 75179 SP3490 SP3078E Half 16 Yes Yes MAX 3078E, 75176 SP3485, 256 8 SP3481 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 6

PaCKaGE: 8 PIN NSOIC Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 7

PaCKaGE: 14 PIN NSOIC Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 8

ORDERING INFORMaTION Model Temperature Range Package SP3070EEN-L ..................................................-40˚C to +85˚C......................................................4-pin NSOIC SP3070EEN-L/TR ............................................-40˚C to +85˚C......................................................4-pin NSOIC SP3070EMN-L ................................................-40˚C to +125˚C.....................................................4-pin NSOIC SP3070EMN-L/TR...........................................-40˚C to +125˚C.....................................................4-pin NSOIC SP307EEN-L ..................................................-40˚C to +85˚C........................................................8-pin NSOIC SP307EEN-L/TR ............................................-40˚C to +85˚C........................................................8-pin NSOIC SP307EMN-L ................................................-40˚C to +125˚C.......................................................8-pin NSOIC SP307EMN-L/TR...........................................-40˚C to +125˚C.......................................................8-pin NSOIC SP3072EEN-L ..................................................-40˚C to +85˚C........................................................8-pin NSOIC SP3072EEN-L/TR ............................................-40˚C to +85˚C........................................................8-pin NSOIC SP3072EMN-L ................................................-40˚C to +125˚C.......................................................8-pin NSOIC SP3072EMN-L/TR...........................................-40˚C to +125˚C.......................................................8-pin NSOIC SP3073EEN-L ..................................................-40˚C to +85˚C......................................................4-pin NSOIC SP3073EEN-L/TR ............................................-40˚C to +85˚C......................................................4-pin NSOIC SP3073EMN-L ................................................-40˚C to +125˚C.....................................................4-pin NSOIC SP3073EMN-L/TR...........................................-40˚C to +125˚C.....................................................4-pin NSOIC SP3074EEN-L ..................................................-40˚C to +85˚C........................................................8-pin NSOIC SP3074EEN-L/TR ............................................-40˚C to +85˚C........................................................8-pin NSOIC SP3074EMN-L ................................................-40˚C to +125˚C.......................................................8-pin NSOIC SP3074EMN-L/TR...........................................-40˚C to +125˚C.......................................................8-pin NSOIC SP3075EEN-L ..................................................-40˚C to +85˚C........................................................8-pin NSOIC SP3075EEN-L/TR ............................................-40˚C to +85˚C........................................................8-pin NSOIC SP3075EMN-L ................................................-40˚C to +125˚C.......................................................8-pin NSOIC SP3075EMN-L/TR...........................................-40˚C to +125˚C.......................................................8-pin NSOIC SP3076EEN-L ..................................................-40˚C to +85˚C......................................................4-pin NSOIC SP3076EEN-L/TR ............................................-40˚C to +85˚C......................................................4-pin NSOIC SP3076EMN-L ................................................-40˚C to +125˚C.....................................................4-pin NSOIC SP3076EMN-L/TR...........................................-40˚C to +125˚C.....................................................4-pin NSOIC SP3077EEN-L ..................................................-40˚C to +85˚C........................................................8-pin NSOIC SP3077EEN-L/TR ............................................-40˚C to +85˚C........................................................8-pin NSOIC SP3077EMN-L ................................................-40˚C to +125˚C.......................................................8-pin NSOIC SP3077EMN-L/TR...........................................-40˚C to +125˚C.......................................................8-pin NSOIC SP3078EEN-L ..................................................-40˚C to +85˚C........................................................8-pin NSOIC SP3078EEN-L/TR ............................................-40˚C to +85˚C........................................................8-pin NSOIC SP3078EMN-L ................................................-40˚C to +125˚C.......................................................8-pin NSOIC SP3078EMN-L/TR...........................................-40˚C to +125˚C.......................................................8-pin NSOIC For availability of PDIP or other packaging contact factory. Available in lead free packaging. To order add “-L” suffix to part number. Example: SP3074EEN/TR = standard; SP3074EEN-L/TR = lead free /TR = Tape and Reel Pack quantity is 2,500 for NSOIC. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 9

OTHER INFORMaTION DATE REVISION DESCRIPTION Legacy Sipex Datasheet 06/0/09 .0.0 Convert to Exar format, update ordering information, correct subscript on pages 5-7 and change revision to .0.0 09/30/0 .0. Correct type error on page 7 on driver switching character- istics table. Change SP3076E,3077E and 3078E Receiver enable time from shutdown from 800ns to 3000ns. 2/02/0 .0.2 Add reference to Application Note ANI#2 and change ESD protection levels to IEC 6000-4-2. Notice EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reli- ability. 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 200 EXAR Corporation Datasheet December 200 For technical support please email Exar's Serial Technical Support group at: 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 • 50-668-707 • www.exar.com SP3070E-SP3078E_02_2020 20

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: E xar: SP3076EEN-L SP3077EMN-L SP3072EEN-L SP3075EEN-L SP3071EEN-L SP3077EEN-L SP3078EMN-L SP3073EEN-L SP3074EEN-L SP3078EEN-L SP3070EEN-L SP3074EMN-L SP3071EMN-L/TR SP3071EMN-L SP3070EMN-L/TR SP3072EMN-L SP3070EEN-L/TR SP3075EMN-L SP3071EEN-L/TR SP3075EEN-L/TR SP3070EMN-L SP3072EEN-L/TR SP3073EMN-L/TR SP3074EMN-L/TR SP3072EMN-L/TR SP3073EEN-L/TR SP3074EEN-L/TR SP3073EMN-L SP3075EMN-L/TR SP3077EEN-L/TR SP3076EMN-L SP3076EEN-L/TR SP3078EEN-L/TR SP3076EMN-L/TR SP3077EMN-L/TR SP3078EMN-L/TR