SP481E / SP485E Enhanced Low Power Half-Duplex RS-485 Transceivers Description FEATURES The SP481E and SP485E are a family of half-duplex transceivers that ■■ 5V only meet the specifications of RS-485 and RS-422 serial protocols with ■■ Low power BiCMOS enhanced ESD performance. The ESD tolerance has been improved ■■ Driver / receiver enable for multi-drop on these devices to over ±15kV for both Human Body Model and configurations IEC61000-4-2 Air Discharge Method. These devices are pin-to-pin ■■ Low power shutdown mode (SP481E) compatible with MaxLinear’s SP481 and SP485 devices as well as ■■ Enhanced ESD specifications: ±15kV Human Body Model popular industry standards. As with the original versions, the SP481E ±15kV IEC61000-4-2 Air Discharge and SP485E feature Maxlinear’s BiCMOS design allowing low power ±8kV IEC61000-4-2 Contact operation without sacrificing performance. The SP481E and SP485E Discharge meet the requirements of the RS-485 and RS-422 protocols up ■■ Available in RoHS compliant, lead free to 10Mbps under load. The SP481E is equipped with a low power packaging. shutdown mode. Ordering Information - Back Page Block Diagram RO 1 R 8 VCC RE 2 7 B DE 3 6 A DI 4 D 5 GND SP481E and SP485E REV 1.0.5 1/9

SP481E / SP485E Absolute Maximum Ratings These are stress ratings only and functional operation of the ESD Ratings device at these ratings or any other above those indicated HBM - Human Body Model (A and B pins).................±15kV in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions HBM - Human Body Model (All other pins)................. .±3kV for extended periods of time may affect reliability. IEC61000-4-2 Air Discharge (A and B pins)...............±15kV IEC61000-4-2 Contact Discharge (A and B pins).........±8kV V ................................................................... ............7.0V CC Input Voltages Logic ........................-0.3V to (V + 0.5V) CC Drivers......................-0.3V to (V + 0.5V) CC Receivers........ ...................................±15V Output Voltages Logic ........................-0.3V to (V + 0.5V) CC Drivers ...............................................±15V Receivers..................-0.3V to (V + 0.5V) CC Storage Temperature .................................-65˚C to +150˚C Power Dissipation 8-pin NSOIC ............................................................550mW (derate 6.60mW/°C above +70°C) Electrical Characteristics T = T to T and V = 5V ±5% unless otherwise noted. AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP481E / SP485E 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, DI, RE Input low voltage 0.8 V Applies to DE, DI, RE Input current ±10 µA Applies to DE, DI, RE Driver short circuit current VOUT = HIGH ±250 mA -7V ≤ VO ≤ 12V Driver short circuit current VOUT = LOW ±250 mA -7V ≤ VO ≤ 12V REV 1.0.5 2/9

SP481E / SP485E Electrical Characteristics (Continued) T = T to T and V = 5V ±5% unless otherwise noted. AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP481E / SP485E Driver AC Characteristics Maximum data rate 10 Mbps RE = 5V, DE = 5V; RDIFF = 54Ω, CL1 = CL2 = 100pF Driver input to output, tPLH 30 60 ns See Figures 3 & 5, RDIFF = 54Ω, Driver input to output, tPLH 30 80 ns CL1 = CL2 = 100pF (SP485EMN ONLY) Driver input to output, tPHL 30 60 ns See Figures 3 & 5, RDIFF = 54Ω, Driver input to output, tPHL 30 80 ns CL1 = CL2 = 100pF (SP485EMN ONLY) Driver skew 5 10 ns See Figures 3 and 5, tSKEW = |tDPHL - tDPLH| Driver rise or fall time 15 40 ns From 10%-90%; RDIFF = 54Ω CL1 = CL2 = 100pF; See Figures 3 and 6 Driver enable to output high 40 70 ns CL = 100pF, See Figures 4 and 6, S2 closed Driver enable to output low 40 70 ns CL = 100pF, See Figures 4 and 6, S1 closed Driver disable time from high 40 70 ns CL = 100pF, See Figures 4 and 6, S2 closed Driver disable time from low 40 70 ns CL = 100pF, See Figures 4 and 6, S1 closed SP481E / SP485E Receiver DC Characteristics Differential input threshold -0.2 0.2 Volts -7V ≤ VCM ≤ 12V Differential input threshold (SP485EMN ONLY) -0.4 0.4 Volts -7V ≤ VCM ≤ 12V Input hysteresis 20 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 7 95 mA 0V ≤ VO ≤ VCC SP481E / SP485E Receiver AC Characteristics Maximum data rate 10 Mbps RE = 0V, DE = 0V Receiver input to output 20 45 100 ns tPLH ; See Figures 3 & 7, RDIFF = 54Ω, CL1 = CL2 = 100pF Receiver input to output 20 45 100 ns tPHL ; See Figures 3 & 7, RDIFF = 54Ω, CL1 = CL2 = 100pF Differential receiver skew 13 ns RDIFF = 54Ω, CL1 = CL2 = 100pF, |tPHL - tPLH| See Figures 3 and 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 1.0.5 3/9

SP481E / SP485E Electrical Characteristics, Continued T = T to T and V = 5V ±5% unless otherwise noted AMB MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP481E Shutdown Timing Time to shutdown 50 200 600 ns RE = 5V, DE = 0V Driver enable from shutdown to output high 40 100 ns CL = 100pF; See Figures 4 and 6; S2 Closed Driver enable from shutdown to output low 40 100 ns CL = 100pF; See Figures 4 and 6; S1 Closed Receiver enable from shutdown to output high 300 1000 ns CL = 15pF; See Figures 2 and 8; S2 Closed Receiver enable from shutdown to output low 300 1000 ns CL = 15pF; See Figures 2 and 8; S1 Closed Power Requirements Supply voltage VCC 4.75 5.25 Volts Supply current 900 µA RE, DI = 0V or VCC; DE = VCC No load 600 µA RE = 0V, DI = 0V or 5V; DE = 0V Shutdown mode (SP481E) 10 µA DE = 0V, RE = VCC Environmental and Mechanical Operating Temperture Commercial (_C_) 0 70 °C Industrial (_E_) -40 85 °C (_M_) -40 125 °C Storage Temperature -65 150 °C Package NSOIC (_N) Pin Functions Pin Number Pin Name Description 1 RO Receiver output RO 1 R 8 VCC 2 RE Receiver output enable active LOW RE 2 7 B 3 DE Driver output enable active HIGH DE 3 6 A 4 DI Driver input 5 GND Ground connection DI 4 D 5 GND Non-inverting driver output / 6 A receiver input Inverting driver output / 7 B receiver input SP481E and SP485E 8 VCC Positive supply 4.75V ≤ Vcc ≤ 5.25V Pinout (Top View) REV 1.0.5 4/9

SP481E / SP485E Test Circuits A Test Point 1kΩ Receiver R Output S1 VCC VOD CRL 1kΩ VOC R B S2 Figure 1: RS-485 Driver DC Test Load Circuit Figure 2: Receiver Timing Test Load Circuit C L1 DI A R A S VCC L RO 500Ω 1 Output B B C Under L2 15pF Test C L S 2 Figure 3: RS-485 Driver/Receiver Timing Test Circuit Figure 4: Driver Timing Test Load #2 Circuit Switching Waveforms f ≥ 1MHz; t ≤ 10ns; t ≤ 10ns R F +3V DRIVER INPUT 1.5V 1.5V 0V t t PLH PHL B 1/2V 1/2V DRIVER V O O O OUTPUT A tDPLH tDPHL DIFFERENTIAL VO+ OUTPUT 0V VA – VB VO– tR tF t = |t - t | SKEW DPLH DPHL Figure 5: Driver Propagation Delays REV 1.0.5 5/9

SP481E / SP485E Switching Waveforms (Continued) f = 1MHz; t < 10ns; t < 10ns R F +3V DE 1.5V 1.5V 0V t t ZL LZ 5V A, B 2.3V Output normally LOW 0.5V V OL V OH Output normally HIGH 0.5V A, B 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 INPUT V – OD2 V OH R 1.5V 1.5V OUTPUT V OL t t PHL PLH Figure 7: Receiver Propagation Delays +3V RE 1.5V f = 1MHz ; t ≤ 10ns; t ≤ 10ns 1.5V R F 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 1.0.5 6/9

SP481E / SP485E Description The SP481E and SP485E are half-duplex differential Shutdown Mode transceivers that meet the requirements of RS-485 and The SP481E is equipped with a Shutdown mode. To RS-422. Fabricated with an Maxlinear proprietary BiCMOS enable the shutdown state, both driver and receiver must process, this product requires a fraction of the power of be disabled simultaneously. A logic LOW on DE (pin 3) older bipolar designs. and a Logic HIGH on RE (pin 2) will put the SP481E into Shutdown mode. In Shutdown, supply current will drop to The RS-485 standard is ideal for multi-drop applications and typically 1µA. for long-distance interfaces. RS-485 allows up to 32 drivers and 32 receivers to be connected to a data bus, making it an ideal choice for multi-drop applications. Since the cabling can be as long as 4,000 feet, RS-485 transceivers are equipped with a wide (-7V to 12V) common mode range INPUTS OUTPUTS to accommodate ground potential differences. Because RS-485 is a differential interface, data is virtually immune to LINE RE DE DI A B CONDITION noise in the transmission line. X 1 1 No Fault 1 0 X 1 0 No Fault 0 1 Drivers X 0 X X Z Z The driver outputs of the SP481E and SP485E are differential X 1 X Fault Z Z outputs meeting the RS-485 and RS-422 standards. The typical voltage output swing with no load will be 0 Volts to 5 Volts. With worst case loading of 54Ω across the differential Table 1: Transmit Function Truth Table outputs, the drivers can maintain greater than 1.5V voltage levels. The drivers of the SP481E and SP485E have an enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differential driver outputs. A logic INPUTS OUTPUTS LOW on the DE (pin 3) will tri-state the driver outputs. RE DE A - B R The transmitters of the SP481E and SP485E will operate up 0 0 0.2V 1 to at least 10Mbps. 0 0 -0.2V 0 0 0 Inputs Open 1 Receivers 1 0 X Z The SP481E and SP485E receivers have differential inputs with an input sensitivity as low as ±200mV. Input impedance Table 2: Receive Function Truth Table of the receivers is typically 15kΩ (12kΩ minimum). A wide common mode range of -7V to +12V allows for large ground potential differences between systems. The receivers of the SP481E and SP485E have a tri-state enable control pin. A logic LOW on RE (pin 2) will enable the receiver, a logic HIGH on RE (pin 2) will disable the receiver. The receiver for the SP481E and SP485E will operate up to at least 10Mbps. The receiver for each of the two devices is equipped with the fail-safe feature. Fail-safe guarantees that the receiver output will be in a HIGH state when the input is left unconnected. REV 1.0.5 7/9

SP481E / SP485E Mechanical Dimensions NSOIC8 Top View Side View Front View Drawing No: POD-00000108 Revision: A REV 1.0.5 8/9

SP481E / SP485E Ordering Information(1) Part Number Operating Temperature Range Lead-Free Package Packaging Method SP481ECN-L/TR 0°C to 70°C Reel SP481EEN-L/TR -40°C to 85°C Reel SP485ECN-L Tube 0°C to 70°C SP485ECN-L/TR Yes(2) 8-pin NSOIC Reel SP485EEN-L Tube -40°C to 85°C SP485EEN-L/TR Reel SP485EMN-L/TR -40°C to 125°C Reel NOTE: 1. Refer to www.exar.com/SP481E and www.exar.com/SP485E for most up-to-date Ordering Information. 2. Visit www.exar.com for additional information on Environmental Rating. Revision History Revision Date Description -- 05/11/07 Legacy Sipex Datasheet Convert to Exar Format. Update ordering information as a result of discontinued Lead type 1.0.0 12/18/08 package options per PDN 081126-01. Remove "Top Mark" information from ordering page. 1.0.1 11/19/09 Correct table 1 error for driver output A and B outputs Change SP485EMN-L and SP485EMN-L/TR temperature range error from +85C to +125C in 1.0.2 08/08/10 ordering information section. Remove driver minimum limits of propagation delay and Rise/Fall time. Remove SP481ECP-L 1.0.3 05/27/11 and SP481EEP-L per PDN 110510-01 1.0.4 05/24/13 Correct type errors per PCN 13-0503-01 Update to MaxLinear logo. Remove GND from Differential Output Voltage min (page 2). Update format and ordering information table. Truth Tables moved to page 7 description section. 1.0.5 03/12/18 Removed obsolete PDIP from absolute maximums, mechanicals and mechanical dimensions. ESD IEC61000-4-2 Contact Discharge rating added. 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. © 2007 - 2018 MaxLinear, Inc. All rights reserved SP481E_SP485E_DS_031218 REV 1.0.5 9/9

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: E xar: SP485EMN-L SP485EEP-L SP485ECP-L SP485ES-L SP485ECN-L SP485EEN-L SP485EN-L SP485EN-L/TR SP485ECN-L/TR SP485EEN-L/TR SP485EMN-L/TR