XR3087XEDTR-F

XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS E X C E L L E N C E & R E L I A B I L I T Y JULY 2015 REV. 1.0.2 GENERAL DESCRIPTION FEATURES The XR3080-88X family of high performance RS-485/ 422 devices are designed for improved performance in noisy industrial environments and increased tolerance to system faults.  40% Higher SNR (Signal-to-Noise Ratio) The analog bus pins can withstand direct shorts up to ±18V, and are protected against ESD events up to ±15kV. The Profibus compliant differential output delivers 40% higher SNR than standard RS-485/422 devices, affording additional noise margin or extended cable lengths. The receivers include full fail-safe circuitry, guaranteeing a logic-high receiver output when the receiver inputs are open, shorted, or undriven. The receiver input impedance is at minimum 96k (1/8 unit load), allowing up to 256 devices on the bus while preserving the full signal margin. The drivers are protected by short circuit detection as well as thermal shutdown, and maintain high impedance in shutdown or when powered off. The XR308085X drivers are slew limited for reduced EMI and errorfree communication over long or unterminated data cables. The devices with DE and RE pins include hot swap circuitry to prevent false transitions on the bus during powerup or live insertion, and can enter a 1nA low current shutdown mode for extreme power savings. compared to other RS-485 devices (2.1V vs. 1.5V)  ±18V Fault Tolerance on Analog Bus pins  2.1V Driver Output (Profibus Compliant)  Robust ESD (ElectroStatic Discharge) Protection: ±15kV IEC 61000-4-2 Air Gap Discharge ± 8kV IEC 61000-4-2 Contact Discharge ±15kV Human Body Model ± 4kV Human Body Model on non-bus pins  +4.5V to +5.5V Operation (5V ± 10%)  300µA Idle Current, 1nA Shutdown Current  Enhanced Receiver Fail-Safe Protection for Open, Shorted, or Terminated but Idle Data Lines  Hot-Swap Glitch Protection on DE and RE Pins  Driver Short Circuit Current Limit and Thermal Shutdown for Overload Protection  1/8th Unit Load Allows up to 256 Devices on Bus  Operating Temperature Range: Industrial -40°C to 85°C Extended -40°C to 125°C  Industry Standard 8 and 14 NSOIC Packages The transceivers draw less than 600µA from a +5.0V supply, and typically only 300µA when idling with the receivers active. RO 1 RE R 8 VCC 2 7 B/Z DE 3 6 A/Y DI 4 5 GND D  Motor Control  Security Systems  Building and Process Automation  Remote Utility Meter Reading  Energy Monitoring and Control  Long or Unterminated Transmission Lines  Profibus DP Fieldbus Networks X S E R I E S : TYPICAL APPLICATIONS Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 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 to the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the device. VCC -0.3V to +7.0V Input Voltage at Control and Driver Input (RE, DE, and DI) -0.3V to +7.0V -0.3V to (VCC + 0.3V) Receiver Output Voltage (RO) Driver Output Voltage (A, B, Y and Z) ±18V Receiver Input Voltage (A and B, half or full duplex) ±18V Transient Voltage Pulse, through 100 Figure 6 ±70V Driver Output Current ±250mA Storage Temperature Range -65°C to +150°C Lead Temperature (soldering, 10s) +300°C Package Power Dissipation 8-Pin SO JA = 128.4°C/W Maximum Junction Temperature = +150°C 14-Pin SO JA = 86°C/W CAUTION: ESD (Electrostatic Discharge) sensitive device. Permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused devices must be stored in conductive foam or shunts. Personnel should be properly grounded prior to handling this device. The protective foam should be discharged to the destination socket before devices are removed. 2 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 ORDERING INFORMATION PART NUMBER DUPLEX DATA RATE PACKAGE TEMPERATURE RANGE XR3080XID-F Full 250kbps 14-pin Narrow SOIC -40°C to +85°C XR3081XID-F Full 250kbps 8-pin Narrow SOIC -40°C to +85°C XR3082XID-F Half 250kbps 8-pin Narrow SOIC -40°C to +85°C XR3083XID-F Full 1Mbps 14-pin Narrow SOIC -40°C to +85°C XR3084XID-F Full 1Mbps 8-pin Narrow SOIC -40°C to +85°C XR3085XID-F Half 1Mbps 8-pin Narrow SOIC -40°C to +85°C XR3086XID-F Full 20Mbps 14-pin Narrow SOIC -40°C to +85°C XR3087XID-F Full 20Mbps 8-pin Narrow SOIC -40°C to +85°C XR3088XID-F Half 20Mbps 8-pin Narrow SOIC -40°C to +85°C XR3080XED-F Full 250kbps 14-pin Narrow SOIC -40°C to +125°C XR3081XED-F Full 250kbps 8-pin Narrow SOIC -40°C to +125°C XR3082XED-F Half 250kbps 8-pin Narrow SOIC -40°C to +125°C XR3083XED-F Full 1Mbps 14-pin Narrow SOIC -40°C to +125°C XR3084XED-F Full 1Mbps 8-pin Narrow SOIC -40°C to +125°C XR3085XED-F Half 1Mbps 8-pin Narrow SOIC -40°C to +125°C XR3086XED-F Full 20Mbps 14-pin Narrow SOIC -40°C to +125°C XR3087XED-F Full 20Mbps 8-pin Narrow SOIC -40°C to +125°C XR3088XED-F Half 20Mbps 8-pin Narrow SOIC -40°C to +125°C NOTE: Tape and Reel part numbers are XR30xxXIDTR-F or XR30xxXEDTR-F , -F = Green / RoHS Compliant 3 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 ELECTRICAL CHARACTERISTICS Unless otherwise noted: VCC = +5.0V ±10%, TA = TMIN to TMAX. Typical values are at VCC = 5.0V, TA = +25°C. SYMBOL PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS 4.5 5.5 V 3 VCC V No Load 3 VCC V RL = 100 (RS-422), Figure 3 2.1 VCC V RL = 54 (RS-485), Figure 3 2.1 VCC V -7V  VCM  +12V, Figure 4 ±0.2 V 3 V ±0.2 V DRIVER DC CHARACTERISTICS VCC VOD Supply Voltage Range Differential Driver Output VOD Change in Magnitude of Differential Output Voltage VCM Driver Common-Mode Output Voltage (steady state) VCM VIH VIL VHYS IIN VCC / 2 Change in Magnitude of Common-Mode Output Voltage Logic Input Thresholds (DI, DE, RE) 2.0 0.8 Input Hysteresis (DI, DE, RE) 100 Logic Input Current (DI, DE, RE) Logic Input Current (DE and RE) IA, B 100 Logic Input High V Logic Input Low ±1 µA ±200 µA 125 µA Input Current (A and B) µA 125 Output Leakage (Y and Z) Full Duplex (Note 2) -100 IOSD V mV -100 IOL ±250 Driver Short-Circuit Output Current RL = 100 (RS-422), or RL = 54 (RS-485), Figure 3, Note 1 µA 0V  VIN  VCC, After first transition, Note 2 Until first transition, Note 2 VOUT = +12V, DE = 0V, VCC = 0V or 5.5V VOUT = -7V, DE = 0V, VCC = 0V or 5.5V VOUT = +12V, DE = 0V, VCC = 0V or 5.5V µA VOUT = -7V, DE = 0V, VCC = 0V or 5.5V mA -7V  VOUT  +12V, Figure 5 DRIVER THERMAL CHARACTERISTICS TTS Thermal Shutdown Temperature 175 °C Junction temperature, Note 4 TTSH Thermal Shutdown Hysteresis 15 °C Note 4 4 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 Unless otherwise noted: VCC = +5.0V ±10%, TA = TMIN to TMAX. Typical values are at VCC = 5.0V, TA = +25°C. SYMBOL PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS -200 -125 -50 mV -7V  VCM  +12V mV VCM = 0V RECEIVER DC CHARACTERISTICS VTH VOH Receiver Differential Threshold Voltage (VA - VB) Receiver Input Hysteresis VOH Receiver Output High Voltage (RO) VOL Receiver Output Low Voltage (RO) IOZR High-Z Receiver Output Current RIN Receiver Input Resistance IOSC Receiver Output Short-Circuit Current 25 V IOUT = -4mA 0.4 V IOUT = 4mA ±1 µA 0V  VOUT  VCC k -7V  VCM  +12V ±95 mA 0V  VRO  VCC 425 600 µA 330 600 µA 300 600 µA No Load, RE = 0V, DE = 0V Receiver A and B inputs open 0.001 1 µA RE = VCC, DE = 0V, Temperature grade I 0.001 3 µA RE = VCC, DE = 0V Temperature grade E ±15 kV Human Body Model ±15 kV IEC 61000-4-2 Airgap ±8 kV IEC 61000-4-2 Contact ±4 kV Human Body Model VCC-1.5 96 SUPPLY CURRENT ICC ISHDN Supply Current Supply Current in Shutdown Mode No Load, RE = 0V, DE = VCC DI = 0V No Load, RE = VCC, DE = VCC DI = 0V ESD PROTECTION ESD Protection for A, B, Y, and Z ESD Protection for all other pins 5 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 Unless otherwise noted: VCC = +5.0V ±10%, TA = TMIN to TMAX. Typical values are at VCC = 5.0V, TA = +25°C. SYMBOL PARAMETERS MIN. TYP. DRIVER AC CHARACTERISTICS MAX. UNITS XR3080X, XR3081X and XR3082X (250kbps) tDPLH Driver Prop. Delay (Low to High) 350 1500 ns tDPHL Driver Prop. Delay (High to Low) 350 1500 ns 200 ns 1500 ns |tDPLH-tDPHL| tDR, tDF CONDITIONS Differential Driver Output Skew 20 Driver Differential Output Rise or Fall Time 400 Maximum Data Rate 250 kbps CL = 50pF, RL = 54, Figure 7 1/tUI, Duty Cycle 40 to 60% tDZH Driver Enable to Output High 200 2500 ns tDZL Driver Enable to Output Low 200 2500 ns CL = 50pF, RL = 500, tDHZ Driver Disable from Output High 6 100 ns Figure 8 tDLZ Driver Disable from Output Low 6 100 ns tDZH(SHDN) Driver Enable from Shutdown to Output High 5500 ns tDZL(SHDN) Driver Enable from Shutdown to Output Low 5500 ns 600 ns tSHDN Time to Shutdown 50 200 RECEIVER AC CHARACTERISTICS Figure 8 Notes 3 and 4 XR3080X, XR3081X and XR3082X (250kbps) tRPLH Receiver Prop. Delay (Low to High) 200 ns tRPHL Receiver Prop. Delay (High to Low) 200 ns |tRPLH-tRPHL| Receiver Propagation Delay Skew 30 ns Maximum Data Rate CL = 50pF, RL = 500, 250 kbps CL = 15pF, VID = ±2V, VID Rise and Fall times < 15ns Figure 9 1/tUI, Duty Cycle 40 to 60% tRZH Receiver Enable to Output High 50 ns tRZL Receiver Enable to Output Low 50 ns CL = 15pF, RL = 1k, tRHZ Receiver Disable from Output High 50 ns Figure 10 tRLZ Receiver Disable from Output Low 50 ns tRZH(SHDN) Receiver Enable from Shutdown to Output High 3500 ns tRZL(SHDN) Receiver Enable from Shutdown to Output Low 3500 ns 600 ns tSHDN Time to Shutdown 50 200 6 CL = 15pF, RL = 1k, Figure 10 Notes 3 and 4 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 Unless otherwise noted: VCC = +5.0V ±10%, TA = TMIN to TMAX. Typical values are at VCC = 5.0V, TA = +25°C. SYMBOL PARAMETERS MIN. TYP. DRIVER AC CHARACTERISTICS MAX. UNITS XR3083X, XR3084X and XR3085X (1Mbps) tDPLH Driver Prop. Delay (Low to High) 150 500 ns tDPHL Driver Prop. Delay (High to Low) 150 500 ns 5 50 ns 200 300 ns |tDPLH-tDPHL| tDR, tDF Differential Driver Output Skew Driver Differential Output Rise or Fall Time Maximum Data Rate CONDITIONS 100 CL = 50pF, RL = 54, Figure 7 Mbps 1/tUI, Duty Cycle 40 to 60% 1 tDZH Driver Enable to Output High 1000 2500 ns tDZL Driver Enable to Output Low 1000 2500 ns CL = 50pF, RL = 500, tDHZ Driver Disable from Output High 60 100 ns Figure 8 tDLZ Driver Disable from Output Low 60 100 ns tDZH(SHDN) Driver Enable from Shutdown to Output High 2500 4500 ns tDZL(SHDN) Driver Enable from Shutdown to Output Low 2500 4500 ns 200 600 ns tSHDN Time to Shutdown 50 RECEIVER AC CHARACTERISTICS Figure 8 Notes 3 and 4 XR3083X, XR3084X and XR3085X (1Mbps) tRPLH Receiver Prop. Delay (Low to High) 200 ns tRPHL Receiver Prop. Delay (High to Low) 200 ns |tRPLH-tRPHL| Receiver Propagation Delay Skew 30 ns Maximum Data Rate CL = 50pF, RL = 500, CL = 15pF, VID = ±2V, VID Rise and Fall times < 15ns Figure 9 Mbps 1/tUI, Duty Cycle 40 to 60% 1 tRZH Receiver Enable to Output High 50 ns tRZL Receiver Enable to Output Low 50 ns CL = 15pF, RL = 1k, tRHZ Receiver Disable from Output High 50 ns Figure 10 tRLZ Receiver Disable from Output Low 50 ns tRZH(SHDN) Receiver Enable from Shutdown to Output High 3500 ns tRZL(SHDN) Receiver Enable from Shutdown to Output Low 3500 ns 600 ns tSHDN Time to Shutdown 50 200 7 CL = 15pF, RL = 1k, Figure 10 Notes 3 and 4 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 Unless otherwise noted: VCC = +5.0V ±10%, TA = TMIN to TMAX. Typical values are at VCC = 5.0V, TA = +25°C. SYMBOL PARAMETERS MIN. TYP. DRIVER AC CHARACTERISTICS MAX. UNITS XR3086X, XR3087X and XR3088X (20Mbps) tDPLH Driver Prop. Delay (Low to High) 20 ns tDPHL Driver Prop. Delay (High to Low) 20 ns Differential Driver Output Skew 5 ns Driver Differential Output Rise or Fall Time 15 ns |tDPLH-tDPHL| tDR, tDF Maximum Data Rate CONDITIONS CL = 50pF, RL = 54, Figure 7 Mbps 1/tUI, Duty Cycle 40 to 60% 20 tDZH Driver Enable to Output High 30 ns tDZL Driver Enable to Output Low 30 ns CL = 50pF, RL = 500, tDHZ Driver Disable from Output High 30 ns Figure 8 tDLZ Driver Disable from Output Low 30 ns tDZH(SHDN) Driver Enable from Shutdown to Output High 250 ns tDZL(SHDN) Driver Enable from Shutdown to Output Low 250 ns 600 ns tSHDN Time to Shutdown 50 200 RECEIVER AC CHARACTERISTICS Figure 8 Notes 3 and 4 XR3086X, XR3087X and XR3088X (20Mbps) tRPLH Receiver Prop. Delay (Low to High) 40 ns tRPHL Receiver Prop. Delay (High to Low) 40 ns |tRPLH-tRPHL| Receiver Propagation Delay Skew 5 ns Maximum Data Rate CL = 50pF, RL = 500, CL = 15pF, VID = ±2V, VID Rise and Fall times < 15ns Figure 9 Mbps 1/tUI, Duty Cycle 40 to 60% 20 tRZH Receiver Enable to Output High 30 ns tRZL Receiver Enable to Output Low 30 ns CL = 15pF, RL = 1k, tRHZ Receiver Disable from Output High 30 ns Figure 10 tRLZ Receiver Disable from Output Low 30 ns tRZH(SHDN) Receiver Enable from Shutdown to Output High 2200 ns tRZL(SHDN) Receiver Enable from Shutdown to Output Low 2200 ns 600 ns tSHDN Time to Shutdown 50 200 8 CL = 15pF, RL = 1k, Figure 10 Notes 3 and 4 XR3080-88X REV. 1.0.2 HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS NOTE: 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. The hot swap feature disables the DE and RE inputs for the first 10µs after power is applied. Following this time period these inputs are weakly pulled to their disabled state (low for DE, high for RE) until the first transition, after which they become high impedance inputs. 3. The transceivers are put into shutdown by bringing RE High and DE Low simultaneously for at least 600ns. If the control inputs are in this state for less than 50ns, the device is guaranteed to not enter shutdown. If the enable inputs are held in this state for at least 600ns the device is assured to be in shutdown. Note that the receiver and driver enable times increase significantly when coming out of shutdown. 4. This spec is guaranteed by design and bench characterization. 9 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 BLOCK DIAGRAMS FIGURE 1. HALF DUPLEX (XR3082X, XR3085X, XR3088X) RO 1 RE R 8 VCC 2 7 B/Z DE 3 6 A/Y DI 4 5 GND D FIGURE 2. FULL DUPLEX (XR3080X, XR3081X, XR3083X, XR3084X, XR3086X, XR3087X) VCC 1 RO 2 DI 3 GND 4 R D N/C 1 R 14 VCC 13 N/C 8 A RO 2 7 B RE 3 12 A 6 Z DE 4 11 B 5 Y DI 5 10 Z GND 6 9 Y GND 7 8 N/C 10 D XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 TEST FIGURES FIGURE 3. DIFFERENTIAL DRIVER OUTPUT VOLTAGE Z RL 2 DI = 0V or VCC D VOD VCM RL 2 Y DE = VCC FIGURE 4. DIFFERENTIAL DRIVER OUTPUT VOLTAGE OVER COMMON MODE Z 375Ω DI = 0V or VCC D VOD VCM 60Ω 375Ω Y DE = VCC FIGURE 5. DRIVER OUTPUT SHORT CIRCUIT CURRENT Z DI = 0V or VCC IOSD D -7V to +12V Y DE = 0V or VCC 11 V XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 FIGURE 6. TRANSIENT OVER-VOLTAGE TEST CIRCUIT Device powered on or powered off A or Z Transceiver, Generator, or Receiver 100 VTEST 15us duration 15 duty cycle B or Y FIGURE 7. DRIVER PROPAGATION DELAY TEST CIRCUIT & TIMING DIAGRAM DI 3V 1.5V 0V Z tSKEW = |tDPHL – tDPLH| 1.5V tDPLH tDPHL VOD Y VOD (VY - VZ) VOD+ 0V VOD- 90% 90% 10% 10% tDR tDF Z DI D VOD RL CL Y DE = VCC 12 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 FIGURE 8. DRIVER ENABLE AND DISABLE TIMING TEST CIRCUITS & TIMING DIAGRAMS Z Testing Z: DI = 0V VOUT D Testing Y: DI = VCC RL DE CL Y 3V DE 1.5V 1.5V 0V tDZH VOH tDHZ VOH + VOL 2 VOUT VOH - 0.25V VOL VCC Z RL Testing Z: DI = VCC VOUT D Testing Y: DI = 0V CL DE Y 3V DE 1.5V 1.5V 0V tDZL VOH VOUT tDLZ VOH + VOL 2 VOL + 0.25V VOL 13 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 FIGURE 9. RECEIVER PROPAGATION DELAY TEST CIRCUIT & TIMING DIAGRAM B RO R CL A RE = 0V B +1V 0V -1V A tRPLH tRPHL VOH 1.5V 1.5V VOL RO 14 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 FIGURE 10. RECEIVER ENABLE AND DISABLE TEST CIRCUITS & TIMING DIAGRAMS B RO R RE A RL CL 3V RE 1.5V 1.5V 0V tRZH VA = VCC VB = 0V VOH tRHZ VOH 2 RO VOH - 0.25V 0V VCC B RL RO R CL RE A 3V RE 1.5V 1.5V 0V tRZL VA = 0V VB = VCC VCC RO tRLZ VCC + VOL 2 VOL + 0.25V VOL 15 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 PIN DESCRIPTIONS PIN NUMBER HALF DUPLEX FULL DUPLEX XR3082X XR3085X XR3088X XR3081X XR3084X XR3087X XR3080X XR3083X XR3086X 1 2 2 2 3 - - 3 4 PIN NAME TYPE RO Out RE DE DESCRIPTION Receiver Output. When RE is low and if (A-B)  -50mV, RO is high. If (A-B)  -200mV, RO is Low. In Receiver Output Enable (Hot Swap). When RE is low, RO is enabled. When RE is High, RO is high impedance. RE should be high and DE should be low to enter shutdown mode. In Driver Output Enable (Hot Swap). When DE is high, outputs are enabled. When DE is low, outputs are high impedance. DE should be low and RE should be high to enter shutdown mode. Driver Input. With DE high, a low level on DI forces non-Inverting output low and inverting output high. Similarly, a high level on DI forces non-Inverting output high and inverting output low. 4 3 5 DI In 5 4 6, 7 GND Pwr Ground. 6 - - A I/O Non-Inverting Receiver Input and Non-Inverting Driver Output. 7 - - B I/O Inverting Receiver Input and Inverting Driver Output. 8 1 14 VCC Pwr +5.0V Power Supply Input. Bypass to ground with 0.1 µF capacitor. - 8 12 A In Non-Inverting Receiver Input. - 7 11 B In Inverting Reciever Input. - 5 9 Y Out Non-Inverting Driver Output. - 6 10 Z Out Inverting Driver Output. - - 1, 8, 13 N/C - 16 No Connect, not internally connected. XR3080-88X REV. 1.0.2 HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS PRODUCT DESCRIPTION The XR3080-88X RS-485/422 devices are part of Exar’s X Series high performance serial interface product line. The analog bus pins can survive direct shorts up to ±18V, and are protected against ESD events up to ±15kV. The Profibus compliant differential output delivers 40% higher SNR than other RS-485/422 devices, affording additional noise margin or extended cable lengths. ENHANCED FAILSAFE Ordinary RS-485 differential receivers will be in an indeterminate state whenever the data bus is not being actively driven. The enhanced failsafe feature of the XR3080-88X family guarantees a logic-high receiver output when the receiver inputs are open, shorted, or when they are connected to a terminated transmission line with all drivers disabled. In a terminated bus with all transmitters disabled, the receivers’ differential input voltage is pulled to 0V by the termination. The XR3080-88X family interprets 0V differential as a logic high with a minimum 50mV noise margin while maintaining compliance with the EIA/TIA-485 standard of ±200mV. Although the XR3080-88X family does not need failsafe biasing resistors, it can operate without issue if biasing is used. RECEIVER INPUT FILTERING XR3080-85X receivers incorporate internal filtering in addition to input hysteresis. This filtering enhances noise immunity by ignoring signals that do not meet a minimum pulse width of 30ns. Receiver propagation delay increases slightly due to this filtering. The high speed XR3086X, XR3087X and XR3088X devices do not have this input filtering. HOT-SWAP CAPABILITY When VCC is first applied the XR3080-88X family holds the driver enable and receiver enable inactive for approximately 10 microseconds. During power ramp-up other system ICs may drive unpredictable values, or tristated lines may be influenced by stray capacitance. The hot-swap feature prevents the XR3080-88X family from driving any output signal until power has stabilized. After the initial 10µs, the driver and receiver enable pins are weakly pulled to their disabled states (low for DE, high for RE) until the first transition. After the first transition, the DE and RE pins operate as high impedance inputs. If circuit boards are inserted into an energized backplane (commonly called "live insertion" or "hot-swap") power may suddenly be 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. 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 thermal-shutdown circuit forces the driver outputs into a high-impedance state if junction temperature becomes excessive. LINE LENGTH The RS-485/RS-422 standard covers line lengths up to 4000ft. Maximum achievable line length is a function of signal attenuation and noise. Termination prevents signal reflections by eliminating the impedance mismatches on a transmission line. Line termination is generally used if rise and fall times are shorter than the round-trip signal propagation time. Higher output drivers may allow longer cables to be used. 17 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 ±15kV ESD PROTECTION ESD protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs of the XR3080-88X 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 XR3080-88X keep operating without latch-up or damage. ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of the XR3080-88X are characterized for protection to the following limits: ±15kV using the Human Body Model ± 8kV using the Contact Discharge Model ±15kV Air-gap Discharge Model ESD TEST CONDITIONS ESD performance depends on a variety of conditions. Contact Exar for a reliability report that documents test setup, methodology and results. IEC 61000-4-2 The IEC 61000-4-2 standard covers ESD testing and performance of finished equipment. However, it does not specifically refer to integrated circuits. The XR3080-88X family helps you design equipment to meet IEC 61000-4-2, without sacrificing board-space and cost for external ESD-protection components. The major differences between tests done using the Human body model and IEC 61000-4-2 is a higher peak current in IEC 61000-4-2. Series resistance is lower in the IEC 61000-4-2 model. Hence, the ESD withstand voltage measured to IEC 61000-4-2 is generally lower than that of 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. 256 TRANSCEIVERS ON THE BUS The standard RS-485 receiver input impedance is 12k Ohms (1 unit load). A standard driver can drive up to 32 unit loads. The XR3080-88X family of transceivers have a 1/8th unit load receiver input impedance of 96k, allowing 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. LOW POWER SHUTDOWN MODE Low-power shutdown mode is initiated by bringing both RE high and DE low simultaneously. While in shutdown devices draw less than 1µA 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 will enter shutdown. 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 shutdown. The drivers and receivers take longer to become enabled from low-power shutdown tZH(SHDN) and tZL(SHDN) than from driver / receiver disable mode (tZH and tZL). 18 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 FUNCTION TABLES TABLE 1: FULL DUPLEX 14 PIN - XR3080X, XR3083X AND XR3086X TRANSMITTING Inputs Outputs RE DE DI Y Z X 1 1 1 0 X 1 0 0 1 0 0 X High-Z 1 0 X Shutdown TABLE 2: FULL DUPLEX 8 PIN - XR3081X, XR3084X AND XR3087X TRANSMITTING Input Outputs DI Y Z 1 1 0 0 0 1 TABLE 3: HALF DUPLEX 8 PIN - XR3082X, XR3085X AND XR3088X TRANSMITTING Inputs Outputs RE DE DI A B X 1 1 1 0 X 1 0 0 1 0 0 X High-Z 1 0 X Shutdown 19 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 TABLE 4: FULL DUPLEX 14 PIN - XR3080X, XR3083X AND XR3086X RECEIVING Inputs Ouptut RE DE VA - VB RO 0 X  -50mV 1 0 X  -200mV 0 0 X Open/Shorted 1 1 1 X High-Z 1 0 X Shutdown TABLE 5: FULL DUPLEX 8 PIN - XR3081X, XR3084X AND XR3087X RECEIVING Inputs Output VA - VB RO  -50mV 1  -200mV 0 Open/Shorted 1 TABLE 6: HALF DUPLEX 8 PIN - XR3082X, XR3085X AND XR3088X RECEIVING Inputs Output RE DE VA - VB RO 0 X  -50mV 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  -50mV are considered indeterminate. 20 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 PRODUCT SELECTOR GUIDE TABLE 7: SELECTION GUIDE SHUTDOWN RECEIVER AND DRIVER ENABLE TRANS ON BUS FOOTPRINT Full Yes Yes 256 SN75180 XR3080XED-F Full Yes Yes 256 SN75180 XR3081XID-F Full No No 256 SN75179 XR3081XED-F Full No No 256 SN75179 XR3082XID-F Half Yes Yes 256 SN75176 XR3082XIE-F Half Yes Yes 256 SN75176 XR3083XID-F Full Yes Yes 256 SN75180 XR3083XED-F Full Yes Yes 256 SN75180 XR3084XID-F Full No No 256 SN75179 XR3084XED-F Full No No 256 SN75179 XR3085XID-F Half Yes Yes 256 SN75176 XR3085XED-F Half Yes Yes 256 SN75176 XR3086XID-F Full Yes Yes 256 SN75180 XR3086XED-F Full Yes Yes 256 SN75180 XR3087XID-F Full No No 256 SN75179 XR3087XED-F Full No No 256 SN75179 XR3088XID-F Half Yes Yes 256 SN75176 XR3088XED-F Half Yes Yes 256 SN75176 PART NUMBER DUPLEX XR3080XID-F DATA RATE 250kbps 1Mbps 20Mbps 21 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS PACKAGE DRAWINGS FIGURE 11. 8 NSOIC 22 REV. 1.0.2 XR3080-88X REV. 1.0.2 HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS FIGURE 12. 14 NSOIC 23 XR3080-88X HIGH OUTPUT 18V TOLERANT RS-485/RS-422 +5V TRANSCEIVERS REV. 1.0.2 REVISION HISTORY DATE REVISION DESCRIPTION April 2013 1.0.0 Production Release Sept 2013 1.0.1 Type formatting changes July 2015 1.0.2 Added Figure 6, add -extended temp range -40°C to 125°C part numbers, updated ISHDN for industrial and extended temp ranges, updated ordering information table and table #7. ECN# 1530-01 NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in 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 writing, 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 2015 EXAR Corporation Datasheet July 2015. 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. 24