SP490 / SP491 Full-Duplex RS-485 Transceivers Description FEATURES The SP490 is a low power differential line driver/receiver meeting ■■ 5V only RS-485 and RS-422 standards up to 5Mbps. The SP491 is identical ■■ Low power BiCMOS to the SP490 with the addition of driver and receiver tri-state enable ■■ Driver/receiver enable (SP491) lines. Both products feature ±200mV receiver input sensitivity, over ■■ RS-485 and RS-422 drivers/receivers wide common mode range. The SP490 is available in 8-pin NSOIC ■■ Pin compatible with LTC490 and SN75179 (SP490) packages for operation over the commercial temperature range. The ■■ Pin compatible with LTC491 and SP491 is available in 14-pin NSOIC packages for operation over the SN75180 (SP491) commercial and industrial temperature ranges. Ordering Information - Back Page Block Diagrams VCC 1 NC 1 1143 VCC NC 8 12 A A 2 2 R R 7 R R 11 B B 3 REB 4 DE 6 10 Z Z 3 5 D D D D 5 Y 6 9 Y 4 GND 7 8 NC GND GND SP490 SP491 REV 1.0.2 1/13

SP490 / SP491 Absolute Maximum Ratings (SP490) 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 SP490 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 SP490 Driver AC Characteristics Maximum data rate 5 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% to 90%; RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 5 REV 1.0.2 2/13

SP490 / SP491 Electrical Characteristics (Continued) T =T to T and V = 5V ±5% unless otherwise noted. AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP490 Receiver DC Characteristics Differential input threshold -0.2 0.2 V -7V ≤ VCM ≤ 12V Input hysteresis 70 mV VCM = 0V Output voltage HIGH 3.5 V VID = 200mV, IO = -4mA Output voltage LOW 0.4 V 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 SP490 Receiver AC Characteristics Maximum data rate 5 Mbps Receiver input to output, tPLH 45 150 ns RFiDgIuFrFe =s 35 4aΩn,d C 7L1 = CL2 = 100pF; Receiver input to output, tPHL 45 150 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 SP490 Environmental and Mechanical Operating Temperture Commercial (_C_) 0 70 °C Storage Temperature -65 150 °C Package NSOIC (_N) REV 1.0.2 3/13

SP490 / SP491 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 DI D RDIFF RO S1 VCC R Output 500Ω C Under L2 15pF Test CL S2 Figure 3: Driver/Receiver Timing Test Circuit Figure 4: Driver Timing Test Load #2 Circuit REV 1.0.2 4/13

SP490 / SP491 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

SP490 / SP491 Absolute Maximum Ratings (SP491) 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 SP491 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, REB Input low voltage 0.8 V Applies to DE, D, REB Input current ±10 µA Applies to DE, D, REB 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

SP490 / SP491 Electrical Characteristics, Continued T = T to T and V = 5V ±5% unless otherwise noted AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP491 Driver AC Characteristics Maximum data rate 5 Mbps REB = 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 SP491 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; REB = 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 SP491 Receiver AC Characteristics Maximum data rate 5 Mbps REB = 0V Receiver input to output, tPLH 20 45 150 ns RDIFF = 54Ω, CL1 = CL2 = 100pF; Figures 3 & 7 Receiver input to output, tPHL 20 45 150 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 time from LOW 45 70 ns CRL = 15pF; Figures 2 & 8; S1 closed Receiver disable time from HIGH 45 70 ns CRL = 15pF; Figures 2 & 8; S2 closed REV 1.0.2 7/13

SP490 / SP491 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 REB, D = 0V or VCC; DE = VCC SP491 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 REB 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

SP490 / SP491 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 SP490 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 REB Receiver output enable active LOW 3 REB 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 SP491 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

SP490 / SP491 Description Receivers The receivers for both the SP490 and SP491 have The SP490 and SP491 are full-duplex differential differential inputs with an input sensitivity as low as ±200mV. transceivers that meet the requirements of RS-485 and Input impedance of the receivers is typically 15kΩ (12kΩ RS-422. Fabricated with a MaxLinear proprietary BiCMOS minimum). A wide common mode range of -7V to 12V allows process, both products require a fraction of the power of for large ground potential differences between systems. The older bipolar designs. receivers for both the SP490 and SP491 are equipped with the The RS-485 standard is ideal for multi-drop applications fail-safe feature. Fail-safe guarantees that the receiver output or for long-distance interfaces. RS-485 allows up to 32 will be in a high state when the input is left unconnected. drivers and 32 receivers to be connected to a data bus, The receiver of the SP491 has a receiver enable control line making it an ideal choice for multi-drop applications. which is active low. A logic low on REB (pin 3) of the SP491 Since the cabling can be as long as 4,000 feet, RS-485 will enable the differential receiver. A logic high on REB transceivers are equipped with a wide (-7V to 12V) common (pin 3) of the SP491 will tri-state the receiver. mode range to accommodate ground potential differences. Because RS-485 is a differential interface, data is virtually immune to noise in the transmission line. Drivers The drivers for both the SP490 and SP491 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 SP491 has a driver enable control line which is active high. A logic high on DE (pin 4) of the SP491 will enable the differential driver outputs. A logic low on DE (pin 4) of the SP491 will tri-state the driver outputs. The SP490 does not have a driver enable. REV 1.0.2 10/13

SP490 / SP491 Mechanical Dimensions NSOIC8 Top View Side View Front View Drawing No: POD-00000108 Revision: A REV 1.0.2 11/13

SP490 / SP491 Mechanical Dimensions NSOIC14 Top View Side View Front View Drawing No: POD-00000109 Revision: A REV 1.0.2 12/13

SP490 / SP491 Ordering Information(1) Part Number Operating Temperature Range Lead-Free Package Packaging Method SP490CN-L/TR 8-pin NSOIC Reel 0°C to 70°C SP491CN-L/TR Yes(2) Reel 14-pin NSOIC SP491EN-L/TR -40°C to 85°C Reel NOTE: 1. Refer to www.exar.com/SP490 and www.exar.com/SP491 for most up-to-date Ordering Information. 2. Visit www.exar.com for additional information on Environmental Rating. Revision History Revision Date Description - 02/24/05 Sipex Legacy Data Sheet 1.0.0 07/14/08 Convert to Exar format. Remove minimum entry to Driver Short Circuit Current. Change SP490 receiver propagation typical to 45ns. Remove SP491 receiver short circuit current minimum entry. Change SP491 receiver propagation delay MIN and TYP levels to 20 and 45ns respectively. Change SP491 1.0.1 June 2011 receiver Enable and Disable time TYP and MAX levels to 45 and 70ns respectively. Change SP491 Supply Current TYP to 900µA. Remove SP491 driver rise/fall time minimum. Update ordering information. Updated format and included MaxLinear logo. Remove GND from Differential Output Voltage min (page 2 & 6). Update ordering information table format. Corrected Figure numbers (after 1.0.2 02/06/18 Figure 4). Added Pin Function section. Corrected SP491 pin 3 name. Removed obsolete PDIP reference in description and mechanical section, and industrial for SP490. 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. © 2008 - 2017 MaxLinear, Inc. All rights reserved SP490_SP491_DS_020618 REV 1.0.2 13/13

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: E xar: SP491EEN-L SP491ECN-L SP490EEN-L SP491CN-L SP490CN-L SP491EEP-L SP491EN-L SP490EN-L SP490ECN-L SP490EEN-L/TR SP490ECP-L SP490EEP-L SP491ECP-L SP490ECN-L/TR SP491CN-L/TR SP491EN-L/TR SP490EN-L/TR SP491ECN-L/TR SP490CN-L/TR SP490ES-L SP491ES-L SP491EEN-L/TR