SP490E / SP491E Enhanced Full-Duplex RS-485 Transceivers Description FEATURES The SP490E is a low power differential line driver/receiver meeting ■■ 5V only RS-485 and RS-422 standards up to 10Mbps. The SP491E is identical ■■ Low power BiCMOS to the SP490E with the addition of driver and receiver tri-state enable ■■ Driver/receiver enable (SP491E) lines. Both products feature ±200mV receiver input sensitivity, over ■■ RS-485 and RS-422 drivers/receivers wide common mode range. The SP490E is available in 8-pin NSOIC ■■ Pin compatible with LTC490 and SN75179 (SP490E) packages for operation over the commercial and industrial temperature ■■ Pin compatible with LTC491 and SN75180 ranges. The SP491E is available in 14-pin NSOIC packages for (SP491E) operation over the commercial and industrial temperature ranges. ■■ Improved ESD specifications: ±15kV Human Body Model ±15kV IEC61000-4-2 Air Discharge Ordering Information - Back Page Block Diagrams VCC 1 NC 1 1143 VCC NC 2 8 A 2 12 A R R 7 R R 11 B B 3 RE 4 DE 6 10 Z Z 3 5 D D D D 5 Y 6 9 Y 4 GND 7 8 NC GND GND SP490E SP491E REV 1.0.2 1/13

SP490E / SP491E Absolute Maximum Ratings (SP490E) 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. V ................................................................... ............7.0V CC Input Voltages Drivers......................-0.5V to (V + 0.5V) CC Receivers...........................................±14V Output Voltages Drivers................................................±14V Receivers..................-0.5V to (V + 0.5V) CC Storage Temperature.................................-65˚C to +150˚C Power Dissipation..................................................1000mW Electrical Characteristics T = T to T and V = 5V ±5% unless otherwise noted. AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP490E Driver DC Characteristics Differential output voltage VCC V Unloaded; R = ∞Ω; Figure 1 Differential output voltage 2 VCC V With load; R = 50Ω (RS-422); Figure 1 Differential output voltage 1.5 VCC V With load; R = 27Ω (RS-485); Figure 1 Change in magnitude of driver differential output voltage for 0.2 V R = 27Ω or R = 50Ω; Figure 1 complimentary states Driver common-mode output voltage 3 V R = 27Ω or R = 50Ω; Figure 1 Input high voltage 2.0 V Applies to D Input low voltage 0.8 V Applies to D Input current ±10 µA Applies to D Driver short circuit current VOUT = HIGH ±250 mA -7V ≤ VO ≤ 12V Driver short circuit current VOUT = LOW ±250 mA -7V ≤ VO ≤ 12V SP490E Driver AC Characteristics Maximum data rate 10 Mbps Driver input to output, tPLH 30 60 ns RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 5 Driver input to output, tPHL 30 60 ns RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 5 Driver skew 5 ns tSKEW = | tDPLH - tDPHL |; Figures 3 & 5 Driver rise or fall time 15 40 ns From 10%-90%; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 5 REV 1.0.2 2/13

SP490E / SP491E Electrical Characteristics (Continued) T = T to T and V = 5V ±5% unless otherwise noted. AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP490E Receiver DC Characteristics Differential input threshold -0.2 0.2 Volts -7V ≤ VCM ≤ 12V Input hysteresis 70 mV VCM = 0V Output voltage HIGH 3.5 Volts VID = 200mV, IO = -4mA Output voltage LOW 0.4 Volts VID = -200mV, IO = 4mA Input resistance 12 15 kΩ -7V ≤ VCM ≤ 12V Input current (A, B); VIN = 12V ±1.0 mA VIN = 12V Input current (A, B); VIN = -7V -0.8 mA VIN = -7V Short circuit current 85 mA 0V ≤ VO ≤ VCC SP490E Receiver AC Characteristics Maximum data rate 10 Mbps Receiver input to output, tPLH 20 45 100 ns RFiDgIuFrFe =s 35 4aΩn,d C 7L1 = CL2 = 100pF; Receiver input to output, tPHL 20 45 100 ns RFiDgIuFrFe =s 35 4aΩn,d C 7L1 = CL2 = 100pF; Differential receiver skew, |tPLH- tPHL| 13 ns RFiDgIuFrFe =s 35 4aΩn,d C 7L1 = CL2 = 100pF; Power Requirements Supply Voltage 4.75 5.25 V Supply Current 900 µA SP490E Environmental and Mechanical Operating Temperture Commercial (_C_) 0 70 °C Industrial (_E_) -40 85 °C Storage Temperature -65 150 °C Package NSOIC (_N) REV 1.0.2 3/13

SP490E / SP491E Test Circuits A Test Point 1kΩ Receiver R Output S1 VCC VOD CRL 1kΩ VOC R B S2 Figure 1: Driver DC Test Load Circuit Figure 2: Receiver Timing Test Load Circuit 3V DE C L1 V DI D RDIFF RO 500Ω S1 CC R Output C Under L2 15pF Test C L S 2 Figure 3: Driver/Receiver Timing Test Circuit Figure 4: Driver Timing Test Load #2 Circuit REV 1.0.2 4/13

SP490E / SP491E Switching Waveforms f = 1MHz; t ≤ 10ns; t ≤ 10ns R F +3V DI 1.5V 1.5V 0V t t PLH PHL Z 1/2V 1/2V DRIVER V O O O OUTPUT Y t t DPLH DPHL V + O VDIFF 0V VZ – VY VO– tR tF t = |t - t | SKEW DPLH DPHL Figure 5: Driver Propagation Delays f = 1MHz;t ≤ 10ns; t ≤ 10ns R F 3V DE 1.5V 1.5V 0V t t ZL LZ Y, Z 2.3V Output normally LOW 0.5V V OL V OH Output normally HIGH 0.5V Y, Z 2.3V 0V t t ZH HZ Figure 6: Driver Enable and Disable Times V + f = 1MHz; tR≤ 10ns; tF ≤ 10ns OD2 A – B 0V 0V V – INPUT OD2 V OH R 1.5V 1.5V OUTPUT V OL tPHL tPLH t = |t - t | SKEW DPLH DPHL Figure 7: Receiver Propagation Delays REV 1.0.2 5/13

SP490E / SP491E Absolute Maximum Ratings (SP491E) 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. V ................................................................... ............7.0V CC Input Voltages Logic.........................-0.5V to (V + 0.5V) CC Drivers......................-0.5V to (V + 0.5V) CC Receivers...........................................±14V Output Voltages Logic.........................-0.5V to (V + 0.5V) CC Drivers................................................±14V Receivers..................-0.5V to (V + 0.5V) CC Storage Temperature....................................-65˚C to 150˚C Power Dissipation..................................................1000mW Electrical Characteristics T = T to T and V = 5V ±5% unless otherwise noted AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP491E Driver DC Characteristics Differential output voltage VCC V Unloaded; R = ∞Ω; Figure 1 Differential output voltage 2 VCC V With load; R = 50Ω (RS-422); Figure 1 Differential output voltage 1.5 VCC V With load; R = 27Ω (RS-485); Figure 1 Change in magnitude of driver differential output voltage for 0.2 V R = 27Ω or R = 50Ω; Figure 1 complimentary states Driver common-mode output voltage 3 V R = 27Ω or R = 50Ω; Figure 1 Input high voltage 2.0 V Applies to DE, D, RE Input low voltage 0.8 V Applies to DE, D, RE Input current ±10 µA Applies to DE, D, RE Driver short circuit current VOUT = HIGH ±250 mA -7V ≤ VO ≤ 12V Driver short circuit current VOUT = LOW ±250 mA -7V ≤ VO ≤ 12V REV 1.0.2 6/13

SP490E / SP491E Electrical Characteristics (Continued) T = T to T and V = 5V ±5% unless otherwise noted AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP491E Driver AC Characteristics Maximum data rate 10 Mbps RE = 5V, DE = 5V Driver input to output, tPLH 30 60 ns RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 5 Driver input to output, tPHL 30 60 ns RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 5 Driver skew 5 10 ns tSKEW = | tDPLH - tDPHL |; Figures 3 & 5 Driver rise or fall time 15 40 ns From 10%-90%; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 5 Driver enable to output HIGH 40 70 ns CL1 = CL2 = 100pF; Figures 4 & 6, S2 closed Driver enable to output LOW 40 70 ns CL1 = CL2 = 100pF; Figures 4 & 6, S1 closed Driver disable time from LOW 40 70 ns CL1 = CL2 = 100pF; Figures 4 & 6, S1 closed Driver disable time from HIGH 40 70 ns CL1 = CL2 = 100pF; Figures 4 & 6, S2 closed SP491E Receiver DC Characteristics Differential input threshold -0.2 0.2 Volts -7V ≤ VCM ≤ 12V Input hysteresis 70 mV VCM = 0V Output voltage HIGH 3.5 Volts VID = 200mV, IO = -4mA Output voltage LOW 0.4 Volts VID = -200mV, IO = 4mA Three-State ( High Impedance) Output Current ±1 µA 0.4V ≤ VO ≤ 2.4V; RE = 5V Input resistance 12 15 kΩ -7V ≤ VCM ≤ 12V Input current (A, B); VIN = 12V ±1.0 mA DE = 0V, VCC = 0V or 5.25V, VIN = 12V Input current (A, B); VIN = -7V -0.8 mA DE = 0V, VCC = 0V or 5.25V, VIN = -7V Short circuit current 85 mA 0V ≤ VO ≤ VCC SP491E Receiver AC Characteristics Maximum data rate 10 Mbps RE = 0V Receiver input to output, tPLH 20 45 100 ns RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 7 Receiver input to output, tPHL 20 45 100 ns RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 7 Differential receiver skew 13 ns |tPLH - tPHL|; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 7 Receiver enable to output LOW 45 70 ns CRL = 15pF; Figures 2 & 8; S1 closed Receiver enable to output HIGH 45 70 ns CRL = 15pF; Figures 2 & 8; S2 closed Receiver disable from LOW 45 70 ns CRL = 15pF; Figures 2 & 8; S1 closed Receiver disable from HIGH 45 70 ns CRL = 15pF; Figures 2 & 8; S2 closed REV 1.0.2 7/13

SP490E / SP491E Electrical Characteristics, Continued T = T to T and V = 5V ±5% unless otherwise noted AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS Power Requirements Supply voltage 4.75 5.25 V Supply current 900 µA RE, D = 0V or VCC; DE = VCC SP491E Environmental and Mechanical Operating Temperture Commercial (_C_) 0 70 °C Industrial (_E_) -40 85 °C Storage Temperature -65 150 °C Package NSOIC (_N) Switching Waveforms f = 1MHz;t ≤ 10ns; t ≤ 10ns R F 3V RE 1.5V 1.5V 0V t t ZL LZ 5V R 1.5V Output normally LOW 0.5V V IL V IH Output normally HIGH 0.5V R 1.5V 0V t t ZH HZ Figure 8: Receiver Enable and Disable Times REV 1.0.2 8/13

SP490E / SP491E Pin Functions 1 Pin Number Pin Name Description V CC 1 VCC Positive supply 8 2 A 2 R Receiver output R R 7 B 3 D Driver Input 4 GND Ground connection 6 5 Y Non-inverting driver output Z 3 6 Z Inverting driver output D D 5 7 B Inverting receiver Input Y 4 8 A Non-inverting receiver input GND SP490E Pinout (Top View) 1 14 VCC Pin Number Pin Name Description NC 13 NC 1 NC No connect 12 2 A 2 R Receiver output R R 11 B 3 RE Receiver output enable active LOW 3 RE 4 DE Driver output enable active HIGH 4 DE 10 5 D Driver input Z 5 D D 6 GND Ground connection 6 9 Y 7 GND Ground connection GND 7 8 GND NC 8 NC No connect 9 Y Non-inverting driver output 10 Z Inverting driver output SP491E 11 B Inverting receiver input Pinout (Top View) 12 A Non-Inverting receiver input 13 NC No connect 14 VCC Positive supply REV 1.0.2 9/13

SP490E / SP491E Description The SP490E and SP491E are full-duplex differential Receivers transceivers that meet the requirements of RS-485 and The receivers for both the SP490E and SP491E RS-422. Fabricated with a MaxLinear proprietary BiCMOS have differential inputs with an input sensitivity as process, both products require a fraction of the power of low as ±200mV. Input impedance of the receivers older bipolar designs. is typically 15kΩ (12kΩ minimum). A wide common mode range of -7V to 12V allows for large ground The RS-485 standard is ideal for multi-drop applications potential differences between systems. The receivers or for long-distance interfaces. RS-485 allows up to 32 for both the SP490E and SP491E are equipped with the drivers and 32 receivers to be connected to a data bus, fail-safe feature. Fail-safe guarantees that the receiver output making it an ideal choice for multi-drop applications. will be in a high state when the input is left unconnected. Since the cabling can be as long as 4,000 feet, RS-485 transceivers are equipped with a wide (-7V to 12V) common The receiver of the SP491E has a receiver enable control line mode range to accommodate ground potential differences. which is active low. A logic low on RE (pin 3) of the SP491E Because RS-485 is a differential interface, data is virtually will enable the differential receiver. A logic high on RE (pin 3) of the SP491E will tri-state the receiver. immune to noise in the transmission line. Drivers The drivers for both the SP490E and SP491E have differential outputs. The typical voltage output swing with no load will be 0 volts to +5 volts. With worst case loading of 54Ω across the differential outputs, the driver can maintain greater than 1.5V voltage levels. The driver of the SP491E has a driver enable control line which is active high. A logic high on DE (pin 4) of the SP491E will enable the differential driver outputs. A logic low on DE (pin 4) of the SP491E will tri-state the driver outputs. The SP490E does not have a driver enable. REV 1.0.2 10/13

SP490E / SP491E Mechanical Dimensions NSOIC8 Top View Side View Front View Drawing No: POD-00000108 Revision: A REV 1.0.2 11/13

SP490E / SP491E Mechanical Dimensions NSOIC14 Top View Side View Front View Drawing No: POD-00000109 Revision: A REV 1.0.2 12/13

SP490E / SP491E Ordering Information(1) Part Number Operating Temperature Range Lead-Free Package Packaging Method SP490ECN-L/TR 0°C to 70°C Reel 8-pin NSOIC SP490EEN-L/TR -40°C to 85°C Reel Yes(2) SP491ECN-L/TR 0°C to 70°C Reel 14-pin NSOIC SP491EEN-L/TR -40°C to 85°C Reel NOTE: 1. Refer to www.exar.com/SP490E and www.exar.com/SP491E for most up-to-date Ordering Information. 2. Visit www.exar.com for additional information on Environmental Rating. Revision History Revision Date Description 14 2000 Sipex Legacy Data Sheet Convert to Exar format. Remove driver propagation delay minimum and driver rise/fall time 1.0.0 May 2011 minimum entry for SP490E and SP491E. Update ESD rating to IEC61000-4-2. Update ordering information. 1.0.1 May 2013 Correct type errors per PCN 13-0503-01 Updated to MaxLinear logo. Remove GND from Differential Output Voltage min (page 2 & 1.0.2 February 2018 5). Update format and ordering information table. Added Pin Function section. Removed obsolete PDIP from description, mechanical and mechanical drawings. Corporate Headquarters: High Performance Analog: 5966 La Place Court 1060 Rincon Circle Suite 100 San Jose, CA 95131 Carlsbad, CA 92008 Tel.: +1 (669) 265-6100 Tel.:+1 (760) 692-0711 Fax: +1 (669) 265-6101 Fax: +1 (760) 444-8598 Email: serialtechsupport@exar.com www.maxlinear.com www.exar.com The content of this document is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by MaxLinear, Inc.. MaxLinear, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide. Complying with all applicable copyright laws is the responsibility of the user. Without limiting the rights under copyright, no part of this document may be reproduced into, stored in, or introduced into a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), or for any purpose, without the express written permission of MaxLinear, Inc. Maxlinear, Inc. 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 MaxLinear, Inc. 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 MaxLinear, Inc. is adequately protected under the circumstances. MaxLinear, Inc. may have patents, patent applications, trademarks, copyrights, or other intellectual property rights covering subject matter in this document. Except as expressly provided in any written license agreement from MaxLinear, Inc., the furnishing of this document does not give you any license to these patents, trademarks, copyrights, or other intellectual property. Company and product names may be registered trademarks or trademarks of the respective owners with which they are associated. © 2000 - 2017 MaxLinear, Inc. All rights reserved SP490E_SP491E_DS_020618 REV 1.0.2 13/13