® SP3070E - SP3078E Family ±15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe RS-485/RS422 Transceivers FEATURES ■ ±15kV ESD protection for RS485 pins ■ 3.3V low-power operation ■ Advanced Receiver-failsafe protection for open, shorted or terminated lines ■ Up to 256 Transceivers may share Bus ■ Very low load for 8x greater fanout ■ Hot Swap glitch protection RE and DE ■ Thermal shutdown protects against driver contention ■ Available in three industry standard footprints RO 1 8 PIN NSOIC RE 2 DE 3 SP3072E SP3075E SP3078E DI 4 Half Duplex VCC 1 RO 2 8 PIN NSOIC 8 VCC 7 B 6 A 5 GND 8 A 7 B SP3071E SP3074E SP3077E DI 3 GND 4 Full Duplex 6 Z 5 Y ■ SP3070E, 3073 and 3076 in Full-Duplex (14 pin) ■ SP3071E, 3074 and 3077 in Full-Duplex (8 pin) ■ SP3072E, 3075 and 3078 in Half-Duplex (8 pin) NC 1 ■ Three applications-optimized speed grades RO 2 14 VCC 14 Pin NSOIC RE 3 ■ SP3070-72E: 250kbps slew-limited DE 4 ■ SP3073-75E: 500kbps slew-limited DI 5 ■ SP3076-78E: 16Mbps high speed GND 6 ■ Small form factor SO-narrow packages ■ Industrial (-40 to +85ºC) and Extended (-40 to +85ºC) temperature grades GND 7 SP3070E SP3073E SP3076E Full Duplex 13 NC 12 A 11 B 10 Z 9 Y 8 NC Now Available in Lead Free Packaging APPLICATIONS ■ Industrial Control, Utility Meters Building Automation, Instrumentation, Point of Sale DESCRIPTION The SP3070-3078E 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 +12V. Receivers will failsafe to logic 1 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 inputs are ESD protected up to ±15kV (Air-Gap and Human Body Model) and up to ±8kV Contact discharge (IEC 1000-4-2). Date: 03/28/05 SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 1 © Copyright 2005 Sipex Corporation 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 R 1 2 R REB 3 4 DE D 5 6 GND 7 GND 10 D D 2 3 4 R D 1 2 RE DE 3 4 DI Date: 03/28/05 R D SP3070E, 250kbps slew limited SP3073E, 500kbps slew limited Z SP3076E, 16Mbps 8 A 7 B 6 GND RO 14 Pin Full Duplex: 9 Y 8 NC VCC 1 R 14 VCC 13 NC 12 A 11 B 8 Pin Full Duplex: SP3071E, 250kbps slew limited SP3074E, 500kbps slew limited Z SP3077E, 16Mbps 5 Y 8 VCC 8 Pin Half Duplex: 7 B 6 A SP3072E, 250kbps slew limited 5 SP3075E, 500kbps slew limited SP3078E, 16Mbps GND SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 2 © Copyright 2005 Sipex Corporation ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation at Ta = 70oC 8-pin SO (derate 5.88mW/oC above +70oC)................................471mW 8-pin PDIP (derate 9.29mW/oC above +70oC)............................727mW 14-pin SO (derate 8.33mW/oC above +70oC).............. .............667mW 14-pin PDIP (derate 10mW/oC above +70oC).................. ..........800mW Operating Temperature Ranges SP307_EMN.................................................................-40ºC to +125ºC SP307_EEN ...............................................................-40ºC to +85ºC Junction Temperature............................................................. ..+150ºC Storage Temperature Range..........................................-65ºC to +150º C Lead Temperature (soldering, 10s) ........................................... +300º C 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.....................................................................................................+6.0V Input Voltage at control input pins (RE, DE).........................-0.3V to 6V Driver Input Voltage (RE, DE)...............................................-0.3V to 6V Driver Output Voltage (A, B, Y, & Z)....................................-8V to +13V Receiver Input Voltage (A, B)..............................................-8V to +13V ELECTRICAL 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. The ♦ denotes the specifications which apply over the full operating range unless otherwise noted. PARAMETER Differential Driver Output SYM. VOD MIN. TYP. MAX. 2 VCC 1.5 VCC UNITS Driver Common Mode Output Voltage Change in Magnitude of Common Mode Output Voltage ∆ VOD ∆ VOC Input High Voltage VIH Input Low Voltage VIL Input Hysteresis Input Current V IIN IO Driver Short-Circuit Current IOSD ♦ No Load V ♦ RL = 54 or 100Ω , Figure 1 3 V ♦ RL = 54 or 100Ω , Figure 1 ±0.2 V V 0.8 100 RL = 54 or 100Ω , Figure 1 ♦ V DE, DI, RE DE, DI, RE mV ♦ DE, DI, RE -1 1 µA ♦ DE, DI, RE 1 10 kΩ ♦ DE, RE First transition will draw more current (Hotswap) +125 Output Leakage (Y and Z) Full Duplex (A and B) RL = 54Ω (RS-485), Figure 1 0.2 2 VHYS Input Impedance First Transition (Hotswap) Date: 03/28/05 VCC/2 VOC CONDITIONS RL = 100Ω (RS-422), Figure 1 VCC Change in Magnitude of Differential Output Voltage ♦ µA -100 0 ±250 -250 0 mA ♦ ♦ DE = GND VCC = GND or 3.6V VIN = -7V -7V ≤ VOUT ≤ 12V, (Figure 4A) SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 3 VIN = +12 V © Copyright 2005 Sipex Corporation ELECTRICAL 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. The ♦ denotes the specifications which apply over the full operating range unless otherwise noted. PARAMETERS SYM MIN TYP MAX UNITS ♦ µA ♦ 125 Input Current (A and B) Half Duplex IA,B Thermal-Shutdown Threshold TTS 165 ºC ♦ Thermal Shutdown Hysteresis TTSH 15 ºC ♦ -100 CONDITIONS DE = GND VCC = GND or 3.6 VIN = +12V VIN = -7V RECEIVER Receiver Differential Threshold (Sensitivity) VTH Receiver Input Hysteresis ∆ VTH RO Output High Voltage VOH RO Output Low Voltage VOL Tri-State Output Current at Receiver IOZR Receiver Input Resistance RIN Receiver Output Short-Circuit Current IOZR -200 -125 -50 mV -7V≤ VCM ≤ 12V mV ♦ Va + Vb = 0V V ♦ IO = -1mA 0.4 V ♦ IO = 1mA +/-1 µA ♦ 0≤ VO ≤ VCC kΩ ♦ -7V ≤ VCM ≤ 12V 15 Vcc 0.6 96 ±60 mA 0V ≤ VRO ≤ VCC SUPPLY CURRENT Supply Current Supply Current in Shutdown mode ICC ISHDN 0.8 1.5 0.8 1.5 0.8 1.5 0.05 3 No Load, RE = 0, DE = VCC mA ♦ No Load, RE = VCC, DE = VCC No Load, RE = 0, DE = 0 µA RE = VCC, DE = GND ESD PROTECTION ±15 ESD Protection for Y, Z, A, and B Human Body Model ±15 kV ±8 Date: 03/28/05 ♦ Air Gap (IEC 1000-4-2) Contact (IEC 1000-4-2) SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 4 © Copyright 2005 Sipex Corporation 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. SP3070E, SP3071E & SP3072E DRIVER SWITCHING CHARACTERISTICS PARAMETER SYMBOL MIN. TYP. MAX. UNITS tDPLH 250 - 1500 ns tDPHL 250 - 1500 ns Driver Differential Output Rise or Fall Time tDR, tDF 350 - 1600 ns CL = 50pF, RL = 54Ω , Figure 2 & 3 Driver Differential Output Skew (tDPLH - t DPHL) tDSKEW - - 200 ns CL = 50pF, RL = 54Ω , Figure 2 & 3 250 - - kbps Driver Propagation Delay Maximum Data Rate CONDITIONS CL = 50pF, RL = 54Ω , Figure 2 & 3 Driver Enable to Output High tDZH - - 2500 ns Figure 4 Driver Enable to Output Low tDZL - - 2500 ns Figure 5 Driver Disable Time from Low tDLZ - - 100 ns Figure 5 Driver Disable Time from High tDHZ - - 100 ns Figure 4 Driver Enable from Shutdown to Output High tDZH(SHDN) - - 5500 ns Figure 4 Driver Enable from Shutdown to Output Low tDZL(SHDN) - - 5500 ns Figure 5 tSHDN 50 200 600 ns Time to Shutdown 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. Receiver Switching Characteristics SP3070, SP3071 & SP3072 PARAMETER Receiver Propagation Delay Receiver Output Skew (tDPLH - tDPHL) SYMBOL MIN. TYP. MAX. UNITS tRPLH - - 200 ns tRPHL - - 200 ns tRSKEW - - 30 ns 250 - - kbps Data Rate CONDITIONS CL = 15pF, Figure 6 & 7 CL = 15pF, Figure 6 & 7 Receiver Enable to Output High tRZH - - 50 ns Figure 8 Receiver Enable to Output Low tRZL - - 50 ns Figure 8 Receiver Disable Time from Low tRLZ - - 200 ns Figure 8 Receiver Disable Time from High tRHZ - - 100 ns Figure 8 Receiver Enable from Shutdown to Output High tRZH(SHDN) - - 4000 ns Figure 8 Receiver Enable from Shutdown to Outtput Low tRZL(SHDN) - - 4000 ns Figure 8 Date: 03/28/05 SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 5 © Copyright 2005 Sipex Corporation 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. SP3073E, SP3074E & SP3075E DRIVER SWITCHING CHARACTERISTICS PARAMETER SYMBOL MIN. TYP. MAX. UNITS tDPLH 180 - 800 ns tDPHL 180 - 800 ns Driver Differential Output Rise or Fall Time tDR, tDF 200 - 800 ns CL = 50pF, RL = 54Ω , Figure 2 & 3 Driver Differential Output Skew (tDPLH - tDPHL) tDSKEW - - 100 ns CL = 50pF, RL = 54Ω , Figure 2 & 3 500 - - kbps Driver Propagation Delay Data Rate CONDITIONS CL = 50pF, RL = 54Ω , Figure 2 & 3 Driver Enable to Output High tDZH - - 2500 ns Figure 4 Driver Enable to Output Low tDZL - - 2500 ns Figure 5 Driver Disable Time from Low tDLZ - - 100 ns Figure 5 Driver Disable Time from High tDHZ - - 100 ns Figure 4 Driver Enable from Shutdown to Output High tDZH(SHDN) - - 4500 ns Figure 4 Driver Enable from Shutdown to Output Low tDZL(SHDN) - - 4500 ns Figure 5 tSHDN 50 200 600 ns Time to Shutdown 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. Receiver Switching Characteristics SP3073, SP3074 & SP3075 PARAMETER Receiver Propagation Delay Receiver Output Skew (tDPLH - tDPHL) SYMBOL MIN. TYP. MAX. UNITS tRPLH - - 200 ns tRPHL - - 200 ns tRSKEW - - 30 ns 500 - - kbps Maximum Data Rate CONDITIONS CL = 15pF, Figure 6 & 7 CL = 15pF, Figure 6 & 7 Receiver Enable to Output High tRZH - - 50 ns Figure 8 Receiver Enable to Output Low tRZL - - 50 ns Figure 8 Receiver Disable Time from Low tRLZ - - 50 ns Figure 8 Receiver Disable Time from High tRHZ - - 50 ns Figure 8 Receiver Enable from Shutdown to Output High tRZH(SHDN) - - 4000 ns Figure 8 Receiver Enable from Shutdown to Outtput Low tRZL(SHDN) - - 4000 ns Figure 8 tSHDN 50 200 600 ns Time to Shutdown Date: 03/28/05 SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 6 © Copyright 2005 Sipex Corporation 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 PARAMETER SYMBOL MIN. TYP. MAX. UNITS tDPLH - - 50 ns tDPHL - - 50 ns Driver Differential Output Rise or Fall Time tDR, tDF - - 15 ns CL = 50pF, RL = 54Ω , Figure 2 & 3 Driver Differential Output Skew (tDPLH - tDPHL) tDSKEW - - 8 ns CL = 50pF, RL = 54Ω , Figure 2 & 3 16 - - Mbps Driver Propagation Delay Data Rate CONDITIONS CL = 50pF, RL = 54Ω , Figure 2 & 3 Driver Enable to Output High tDZH - - 150 ns Figure 4 Driver Enable to Output Low tDZL - - 150 ns Figure 5 Driver Disable Time from Low tDLZ - - 100 ns Figure 5 Driver Disable Time from High tDHZ - - 100 ns Figure 4 Driver Enable from Shutdown to Output High tDZH(SHDN) - - 1800 ns Figure 4 Driver Enable from Shutdown to Output Low tDZL(SHDN) - - 1800 ns Figure 5 tSHDN 50 200 600 ns Time to Shutdown 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 Receiver Switching Characteristics SP3076, SP3077 & SP3078 PARAMETER Receiver Propagation Delay Receiver Output Skew (tDPLH - tDPHL) SYMBOL MIN. TYP. MAX. UNITS CONDITIONS tRPLH - 40 75 ns tRPHL - 40 75 ns CL = 15pF, Figure 6 & 7, -40 to +85ºC tRSKEW - - 8 ns CL = 15pF, Figure 6 & 7, 16 - - Mbps Data Rate Receiver Enable to Output High tRZH - - 60 ns Figure 8, -40 to +85ºC Receiver Enable to Output Low tRZL - - 60 ns Figure 8, -40 to +85ºC Receiver Disable Time from Low tRLZ - - 50 ns Figure 8 Receiver Disable Time from High tRHZ - - 50 ns Figure 8 Receiver Enable from Shutdown to Output High tRZH(SHDN) - - 1800 ns Figure 8 Receiver Enable from Shutdown to Output Low tRZL(SHDN) - - 1800 ns Figure 8 tSHDN 50 200 600 ns Time to Shutdown Date: 03/28/05 SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 7 © Copyright 2005 Sipex Corporation FIGURE 1. DRIVER DC TEST CIRCUIT FIGURE 2. RECEIVER DC TEST CIRCUIT A R/2 DI D VID VOD 0 or 3V R/2 VCC B OUT R RE VOC FIGURE 3. DRIVER PROPAGATION DELAY TIME TEST CIRCUIT AND TIMING DIAGRAM RL 54Ω Y DI D CL 50pF VOD Z 3.3V VCC DI 0 Z Y VCC/2 VDIFF -VO Date: 03/28/05 tPHL VO 1/2 VO VO tPLH 10% tR VDIFF = V(Y) - V(Z) 90% 90% VSKEW = tPLH - tPHL SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 8 1/2 VO 10% tF © Copyright 2005 Sipex Corporation FIGURE 4. DRIVER ENABLE & DISABLE TIMES TEST CIRCUIT & TIMING DIAGRAM Y 0 or VCC DI S1 D OUT Z RL = 500Ω CL = 50pF GENERATOR 50Ω VCC VCC /2 DE 0 tZL, tZL(SHDN 0.25V VOM = (VOL+ VCC)/2 tLZ OUT 0 FIGURE 4A. DRIVER CONTENTION TEST DE = 0 or 3V DI = 0 or 3V A/Y IOSD D 100Ω B/Z -7V to +12V Date: 03/28/05 V SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 9 © Copyright 2005 Sipex Corporation FIGURE 5. DRIVER ENABLE & DISABLE TIMES TEST CIRCUIT & TIMING DIAGRAM VCC Y 0 or VCC DI RL = 500Ω S1 D OUT Z GENERATOR CL = 50pF 50Ω VCC VCC /2 DE 0 tZL, tZL(SHDN tLZ VCC OUT VOM = (VOL+ VCC)/2 VOL 0.25V FIGURE 6. RECEIVER PROPAGATION DELAY TEST CIRCUIT & TIMING DIAGRAM A VID B R RE OUT CL 15pF A +1V B -1V tPHL OUT Date: 03/28/05 tPLH 1.5V SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 10 VOH VOL © Copyright 2005 Sipex Corporation FIGURE 7. RECEIVER ENABLE & DISABLE TIMES TEST CIRCUIT 1.5V S3 -1.5V S1 B A VCC 1kΩ R S2 RE CL = 15pF GENERATOR 50Ω 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 1.5V RE 3V 1.5V RE tZH, tZH(SHDN) tZL, tZL(SHDN) 0V VOH VCC OUT VOH/2 VOL = VCC/2 OUT 0V VOL S1 is closed, S2 is open, S3 = -1.5V S1 is open S2 is closed S3 = 1.5V 3V RE 3V 1.5V RE tHZ 0.25V OUT 1.5V tLZ VOH VCC OUT 0V 0.25V Date: 03/28/05 0V SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 11 VOL © Copyright 2005 Sipex Corporation FUNCTION TABLES SP3070E, SP3073E, SP3076E (Full Duplex) SP3070E, SP3073E, SP3076E (Full Duplex) TRANSMITTING RECEIVING Inputs Inputs Outputs Output RE DE DI Z Y RE DE A, B RO X 1 1 0 1 0 X ≥ -50mV 1 X 1 0 1 0 0 X ≤ -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 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 ≥ -50mV 1 0 1 0 ≤ -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 ≥ -50mV 1 X 1 0 1 0 0 X ≤ -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 Date: 03/28/05 SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 12 © Copyright 2005 Sipex Corporation PIN DESCRIPTION FULL DUPLEX DEVICES HALF DUPLEX DEVICES SP3070E SP3071E SP3072E SP3073E SP3074E SP3075E SP3076E SP3077E SP3078E PIN NAME PIN FUNCTION PIN NUMBER 2 2 1 RO Receiver Output. When RE is low and if (A – B) ≥ -50mV, RO is High. If (A – B) ≤ - 200mV, RO is low. 3 - 2 RE Receiver Output Enable. When RE is low, RO is enabled. When RE is high, RO is high impedance. RE should be high and DE low to enter shutdown mode. RE is a hotswap input. 4 - 3 DE Driver Output Enable. When DE is high, outputs are enabled. When DE is low, outputs are high impedance. 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, a high level on DI forces noninverting output high and inverting output low. 5 3 4 DI 6, 7 4 5 GND 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 - - 6 A Noninverting Receiver Input and Noninverting Driver Output 14 1 8 VCC Positive Supply VCC. Bypass VCC to GND with a 0.1uF capacitor. 1, 8, 13 - - NC No Connect Date: 03/28/05 Ground SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 13 © Copyright 2005 Sipex Corporation DETAILED DESCRIPTION DETAILED DESCRIPTION The SP307XE family of high speed transceivers for RS-485/RS-422 communication contain one driver and one receiver. These devices feature fail-safe circuitry, which 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. The SP3070E, SP3072E, SP3073E, SP3075E, SP3076E and SP3078E also feature a hotswap capability allowing live insertion without error data transfer. The SP3070E, SP3071E and SP3072E feature reduced slewrate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps. The SP3073E, SP3074E and SP3075E also offer slew -rate limits allowing transmit speeds up to 500kbps. The SP3076E, SP3077E, SP3078E driver slew rates are not limited, making transmit speeds up to 16Mbps possible. disabled. If A - B is less than or equal to 200mV, RO is logic low. In the case of a terminated bus with all transmitters disabled the receiver's differential input voltage is pulled to 0V by the termination. With the receiver thresholds of the SP3070E family, this results in a logic high with a 50mV minimum noise margin. In compliance with the EIA/TIA-485 standard, the SP3070E family has a 50mV 200mV threshold. HOT-SWAP CAPABILITY When circuit boards are inserted into a hot backplane, differential disturbances to the data bus can lead to data errors. Upon initial circuit board insertion, the data communication processor undergoes its own power-up sequence. During this period, the processor's logic-output drivers are high impedance and are unable to drive the DE and RE inputs of these devices to a defined logic level. Leakage currents up to 10µA from the high-impedance state of the processor's logic drivers could cause standard CMOS enable inputs of a transceiver to drift to an incorrect logic level. Additionally, parasitic circuit board capacitance could cause coupling of VCC or GND to the enable inputs. Without the hot-swap capability, these factors could improperly enable the transceiver's driver or receiver. The SP3072E, SP3075E and SP3078E are half-duplex transceivers, while the SP3070E, SP3071E, SP3073E, SP3074E, SP3076E, and SP3077E are full duplex transceivers. All devices operate from a single 3.3V 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. When VCC rises, an internal pulldown circuit holds DE low and RE high for approximately 10 microseconds. After the initial power-up sequence, the pulldown circuit becomes transparent, resetting the hot-swap tolerable input. RECEIVER INPUT FILTERING SP3070-SP3075 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 by 25% due to this filtering. 15KV ESD PROTECTION As with all Sipex devices, 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 SP3070E family of devices have extra protection against static electricity. Sipex's engineering team have developed 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 op- FAIL SAFE The SP3070 family guarantees a logic-high receiver output when the receiver inputs are shorted, open, or when they are connected to a terminated transmission line with all drivers Date: 03/28/05 SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 14 © Copyright 2005 Sipex Corporation DETAILED DESCRIPTION eration, shutdown, and powered down. After an ESD event, the SP3070E - SP3078E keep working without latchup or damage. 256 TRANSCEIVERS ON THE BUS The standard RS-485 receiver input impedance is 12kΩ (1 unit load), and the standard driver can drive up to 32 unit loads. The SP3070E family of transceivers has a 1/8unit load receiver input impedance (96Ω), allowing up to 256 transceivers to be connected in parallel on one communication line. Any combination of these devices as well as other RS-485 transceivers with a total of 32 unit loads or fewer can be connected to the line. ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of the SP3070E - SP3078E 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 Airgap REDUCED EMI AND REFLECTIONS The SP3070E, SP3071E and SP3072E feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing errorfree data transmission up to 250kbps. The SP3073, SP3074 and SP3075 offer higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. ESD TEST CONDITIONS ESD performance depends on a variety of conditions. Contact Sipex for a reliability report that documents test setup, methodology and results. 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 SP3070E family of devices helps you design equipment to meet IEC 1000-4-2, without the need for additional ESD-protection components. LOW POWER SHUTDOWN MODE Low-power shutdown mode is initiated by bringing both RE high and DE low. In shutdown, the devices typically draw only 50nA of supply current. The major difference between tests done using the Human Body Model and IEC 10004-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstand voltage measured to EC 1000-4-2 is generally lower than that measured using the human body model. RE and DE can be driven simultaneously; the parts 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 guaranteed to enter shutdown. Enable times tZH and tZL assume the part was not in a low-power shutdown state. Enable times tZH(SHDN) and tZL(SHDN) assume the parts were shut down. It takes drivers and receivers longer to become enabled from low-power shutdown mode tZH(SHDN) and tZL(SHDN) than from driver/receiver-disable mode (tZH, tZL) The air-gap test involves approaching the device with a charged probe. The contactdischarge method connects the probe to the device before the probe is energized. 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. Date: 03/28/05 SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 15 © Copyright 2005 Sipex Corporation DETAILED DESCRIPTION DRIVER OUTPUT PROTECTION Two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. First, current limit on the ouput stage, provides immediate protection against short circuits over the whole common-mode voltage range. Second, a thermal-shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature becomes excessive. TYPICAL APPLICATIONS The SP3072E, SP3075E and SP3078E transceivers are designed for bidirectional data communications on multipoint bus transmission lines. To minimize reflections, terminate the line at both ends in its characteristic impedance, and keep stub lengths off the main line as short as possible. The slew-rate-limited SP3070 - SP3075E are more tolerant of imperfect termination. LINE LENGTH The RS-485/RS422 standard covers line lengths up to 4000ft. PARTS SELECTOR GUIDE PART NUMBER Industry Standard Pinout Pin Compatible Upgrade from: Half/Full Duplex Datarate Mbps Shutdown Receiver Driver Enable Trans. On Bus Pin Count SP3070E Full 0.2 5 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 256 8 MAX 3078E, 75176 SP3485, SP3481 Date: 03/28/05 SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 16 © Copyright 2005 Sipex Corporation PACKAGE: 8 PIN NSOIC D Ø e E/2 E1/2 E1 L2 E Seating Plane L1 1 Gauge Plane VIEW C b INDEX AREA (D/2 X E1/2) Ø L Ø1 TOP VIEW A1 A Seating Plane A2 8 Pin NSOIC JEDEC MO-012 (AA) Variation MIN NOM MAX SYMBOL A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.24 4.90 BSC D 6.00 BSC E 3.90 BSC E1 1.27 BSC e L 0.4 1.27 1.04 REF L1 0.25 BSC L2 ø 0º 8º ø1 5º 15º SIDE VIEW B B SEE VIEW C b c Note: Dimensions in (mm) BASE METAL SECTION B-B WITH PLATING Date: 03/28/05 SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 17 © Copyright 2005 Sipex Corporation PACKAGE: 14 PIN NSOIC D Ø e E/2 L2 E1 E1/2 E Seating Plane L1 Gauge Plane VIEW C 1 INDEX AREA (D/2 X E1/2) Ø L Ø1 b TOP VIEW A1 A Seating Plane SIDE VIEW A2 14 Pin NSOIC JEDEC MO-012 (AB) Variation MIN NOM MAX SYMBOL A 1.35 1.75 A1 0.1 0.25 A2 1.25 1.65 b 0.31 0.51 c 0.17 0.25 8.65 BSC D 6.00 BSC E 3.90 BSC E1 1.27 BSC e L 0.4 1.27 1.04 REF L1 0.25 BSC L2 ø 0º 8º ø1 5º 15º B B SEE VIEW C b c Note: Dimensions in (mm) BASE METAL SECTION B-B WITH PLATING Date: 03/28/05 SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 18 © Copyright 2005 Sipex Corporation ORDERING INFORMATION Model Temperature Range Package SP3070EEN .................................................... -40˚C to +85˚C ..................................................... 14-pin NSOIC SP3070EEN/TR .............................................. -40˚C to +85˚C ..................................................... 14-pin NSOIC SP3070EMN .................................................. -40˚C to +125˚C .................................................... 14-pin NSOIC SP3070EMN/TR ............................................ -40˚C to +125˚C .................................................... 14-pin NSOIC SP3071EEN .................................................... -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3071EEN/TR .............................................. -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3071EMN .................................................. -40˚C to +125˚C ...................................................... 8-pin NSOIC SP3071EMN/TR ............................................ -40˚C to +125˚C ...................................................... 8-pin NSOIC SP3072EEN .................................................... -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3072EEN/TR .............................................. -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3072EMN .................................................. -40˚C to +125˚C ...................................................... 8-pin NSOIC SP3072EMN/TR ............................................ -40˚C to +125˚C ...................................................... 8-pin NSOIC SP3073EEN .................................................... -40˚C to +85˚C ..................................................... 14-pin NSOIC SP3073EEN/TR .............................................. -40˚C to +85˚C ..................................................... 14-pin NSOIC SP3073EMN .................................................. -40˚C to +125˚C .................................................... 14-pin NSOIC SP3073EMN/TR ............................................ -40˚C to +125˚C .................................................... 14-pin NSOIC SP3074EEN .................................................... -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3074EEN/TR .............................................. -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3074EMN .................................................. -40˚C to +125˚C ...................................................... 8-pin NSOIC SP3074EMN/TR ............................................ -40˚C to +125˚C ...................................................... 8-pin NSOIC SP3075EEN .................................................... -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3075EEN/TR .............................................. -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3075EMN .................................................. -40˚C to +125˚C ...................................................... 8-pin NSOIC SP3075EMN/TR ............................................ -40˚C to +125˚C ...................................................... 8-pin NSOIC SP3076EEN .................................................... -40˚C to +85˚C ..................................................... 14-pin NSOIC SP3076EEN/TR .............................................. -40˚C to +85˚C ..................................................... 14-pin NSOIC SP3076EMN .................................................. -40˚C to +125˚C .................................................... 14-pin NSOIC SP3076EMN/TR ............................................ -40˚C to +125˚C .................................................... 14-pin NSOIC SP3077EEN .................................................... -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3077EEN/TR .............................................. -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3077EMN .................................................. -40˚C to +125˚C ...................................................... 8-pin NSOIC SP3077EMN/TR ............................................ -40˚C to +125˚C ...................................................... 8-pin NSOIC SP3078EEN .................................................... -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3078EEN/TR .............................................. -40˚C to +85˚C ....................................................... 8-pin NSOIC SP3078EMN .................................................. -40˚C to +125˚C ...................................................... 8-pin NSOIC SP3078EMN/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. CLICK HERE TO ORDER SAMPLES Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 Corporation ANALOG EXCELLENCE Date: 03/28/05 SP3070E - SP3078E Family, ±15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers 19 © Copyright 2005 Sipex Corporation