SP3490 / SP V Low Power Full-Duplex RS-485 Transceivers with 10Mbps Data Rate VCC 13 NC 12 2 A B A B REB DE 10 Z 5 D GND GND GND.

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1 3.3V Low Power Full-uplex S-485 Transceivers with 10Mbps ata ate escription The SP3490 and SP3491 devices are 3.3V low power full-duplex transceivers that meet the specifications of the S-485 and S-4 serial protocols. These devices are pin-to-pin compatible with the MaxLinear SP490 and SP491 devices as well as popular industry standards. The SP3490 and SP3491 feature MaxLinear s BiCMOS process, allowing low power operation without sacrificing performance. The SP3490 and SP3491 meet the electrical specifications of the S-485 and S-4 serial protocols up to 10Mbps under load. The SP3491 is identical to the SP3490 with the addition of driver and reciveiver tri-state enable lines. FEATUES Full-duplex S-485 and S-4 transceivers Operates from a single 3.3V supply Interoperable with 5. logic river/receiver tri-state enable lines (SP3491) -7V to 1V common-mode input voltage range ±00mV receiver input sensitivity Allows up to 3 transceivers on the serial bus Compatability with LTC490 and SN75179 (SP3490) Compatability with LTC491 and SN75180 (SP3491) Ordering Information - Back Page Block iagrams V CC GN A B Z Y NC EB E GN GN NC 1 A 11 B Z Y 7 8 NC SP3490 SP3491 1/1

2 Absolute Maximum atings 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 CC Input Voltages Output Voltages Logic V to 6. rivers V to 6. eceivers...±14v rivers...±14v eceivers V to 6. Storage Temperature C to +150 C Maximum Junction Temperature, T J...15 C Power issipation 8-pin NSOIC mW (derate 6.90mW/ C above +70 C) 14-pin NSOIC mW (derate 8.33mW/ C above +70 C) Operating Conditions Package Power issipation 8-pin NSOIC Ѳ JA C/W 14-pin NSOIC Ѳ JA C/W ES ating Human Body Model (HBM)... ±kv Electrical Characteristics T AMB = T MIN to T MAX and V CC = 3.3V ±5% unless otherwise noted. PAAMETES MIN. TYP. MAX. UNITS CONITIONS SP3490 river C Characteristics ifferential output voltage Vcc V Unloaded; = Ω ; Figure 1 ifferential output voltage Vcc V With load; = 50Ω (S-4); Figure 1 ifferential output voltage 1.5 Vcc V With load; = 7Ω (S-485); Figure 1 Change in magnitude of driver differential output voltage for complimentary states 0. V = 7Ω or = 50Ω; Figure 1 river common-mode output voltage 3 V = 7Ω or = 50Ω; Figure 1 Input high voltage.0 V Input low voltage 0.8 V Input current ±10 µa river short circuit current V OUT = HIGH river short circuit current V OUT = LOW SP3490 river AC Characteristics Maximum data rate 10 Mbps ±50 ma -7V V O 1V; Figure 8 ±50 ma -7V V O 1V; Figure 8 river input to output, t PLH ns = 7Ω, Figures & 9 river input to output, t PHL ns = 7Ω, Figures & 9 /1

3 Electrical Characteristics (Continued) T AMB = T MIN to T MAX and V CC = 3.3V ±5% unless otherwise noted. PAAMETES MIN. TYP. MAX. UNITS CONITIONS SP3490 river AC Characteristics (Continued) ifferential driver skew ns t PHL (Y)- t PLH (Y), t PHL (Z)- t PLH (Z), Figures and 9 river rise or fall time 5 0 ns From 10%-90%; Figures 3 and 10 SP3490 eceiver C Characteristics ifferential input threshold Volts -7V V CM 1V Input hysteresis 5 mv V CM = Output voltage HIGH Vcc-0.4 Volts V I = 00mV, I O = -1.5mA Output voltage LOW 0.4 Volts V I = -00mV, I O =.5mA Input resistance 1 15 kω -7V V CM 1V Input current (A, B); V IN = 1V 1.0 ma V IN = 1V Input current (A, B); V IN = -7V -0.8 ma V IN = -7V Short circuit current 60 ma V O V CC SP3490 eceiver AC Characteristics Maximum data rate 10 Mbps eceiver input to output, t PLH ns Figures 6 and 1 eceiver input to output, t PLH 85 ns T AMB = 5 C, Vcc = 3.3V, Figures 6 and 1 eceiver input to output, t PHL ns Figures 6 and 1 eceiver input to output, t PHL 85 ns T AMB = 5 C, Vcc = 3.3V, Figures 6 and 1 ifferential receiver skew 4 ns t PHL (A)- t PLH (A), t PHL (B)- t PLH (B), Figures 6 and 1 Power equirements Supply Voltage V Supply Current µa = or V CC ES Protection for,, A, B, Y and Z pins ± kv Human Body Model 3/1

4 Electrical Characteristics, Continued T AMB = T MIN to T MAX and V CC = 3.3V ±5% unless otherwise noted PAAMETES MIN. TYP. MAX. UNITS CONITIONS SP3491 river C Characteristics ifferential output voltage Vcc V Unloaded; = Ω ; Figure 1 ifferential output voltage Vcc V With load; = 50Ω (S-4); Figure 1 ifferential output voltage 1.5 Vcc V With load; = 7Ω (S-485); Figure 1 Change in magnitude of driver differential output voltage for complimentary states 0. V = 7Ω or = 50Ω; Figure 1 river common-mode output voltage 3 V = 7Ω or = 50Ω; Figure 1 Input high voltage.0 V Applies to E,, EB Input low voltage 0.8 V Applies to E,, EB Input current ±10 µa Applies to E,, EB river short circuit current V OUT = HIGH river short circuit current V OUT = LOW ±50 ma -7V V O 1V; Figure 8 ±50 ma -7V V O 1V; Figure 8 SP3491 river AC Characteristics Maximum data rate 10 Mbps river input to output, t PLH ns Figures & 9 river input to output, t PHL ns Figures & 9 ifferential driver skew ns t PHL (Y)- t PLH (Y), t PHL (Z)- t PLH (Z), Figures and 9 river rise or fall time 5 0 ns From 10%-90%; Figures 3 and 10 river enable to output HIGH 5 10 ns Figures 4 and 11 river enable to output LOW ns Figures 5 and 11 river disable from LOW ns Figures 5 and 11 river disable from HIGH ns Figures 4 and 11 4/1

5 Electrical Characteristics, Continued T AMB = T MIN to T MAX and V CC = 3.3V ±5% unless otherwise noted PAAMETES MIN. TYP. MAX. UNITS CONITIONS SP3491 eceiver C Characteristics ifferential input threshold Volts -7V V CM 1V Input hysteresis 5 mv V CM = Output voltage HIGH Vcc-0.4 Volts V I = 00mV, I O = -1.5mA Output voltage LOW 0.4 Volts V I = -00mV, I O =.5mA Three-State ( High Impedance) Output Current ±1 µa V O Vcc; EB = Vcc Input resistance 1 15 kω -7V V CM 1V Input current (A, B); V IN = 1V 1.0 ma Input current (A, B); V IN = -7V -0.8 ma E =, V CC = or 3.6V, V IN = 1V E =, V CC = or 3.6V, V IN = -7V Short circuit current 60 ma V O V CC SP3491 eceiver AC Characteristics Maximum data rate 10 Mbps EB =, E = eceiver input to output, t PLH ns Figures 6 and 1 eceiver input to output, t PLH 85 ns T AMB = 5 C, Vcc = 3.3V, Figures 6 and 1 eceiver input to output, t PHL ns Figures 6 and 1 eceiver input to output, t PHL 85 ns T AMB = 5 C, Vcc = 3.3V, Figures 6 and 1 ifferential receiver skew 4 ns t PHL (A)- t PLH (A), t PHL (B)- t PLH (B), Figures 6 and 1 eceiver enable to output LOW ns Figures 7 and 13; S 1 Closed, S open eceiver enable to output HIGH ns Figures 7 and 13; S Closed, S 1 open eceiver disable from LOW ns Figures 7 and 13; S 1 Closed, S open eceiver disable from HIGH ns Figures 7 and 13; S Closed, S 1 open Power equirements Supply voltage V Supply current µa EB, = or V CC ; E = V CC Supply current µa E = ES protection for,, E, EB, A, B, Y and Z pins ± kv Human Body Model 5/1

6 Pin Functions V CC A B Pin Number Pin Name escription 1 V CC Positive supply 3.0 < Vcc < 3.6 eceiver output 3 river Input 4 GN Ground connection GN Z Y 5 Y Non-inverting driver output 6 Z Inverting driver output 7 B Inverting receiver Input 8 A Non-inverting receiver input SP3490 Pinout (Top View) NC EB E GN GN NC A 11 B Z Y 7 8 NC SP3491 Pinout (Top View) Pin Number Pin Name escription 1 NC No connect (1) eceiver output 3 EB eceiver output enable active LOW 4 E river output enable active HIGH 5 river input 6 GN Ground connection 7 GN Ground connection 8 NC No connect (1) 9 Y Non-inverting driver output 10 Z Inverting driver output 11 B Inverting receiver input 1 A Non-Inverting receiver input 13 NC No connect (1) 14 V CC Positive supply 3.0 < Vcc < 3.6 Note: 1. Not internally bonded, can be connected to Vcc without harm. 6/1

7 Test Circuits VM Vcc V O V OC Figure 1: river C Test Load Circuit GENEATO (NOTE 1) 50Ω Figure : river Propagation elay Test Circuit S1 VOH + VOL = L = 7Ω C L = 15pF (NOTE ) OUT S1 OUT GENEATO (NOTE 1) 50Ω C L L = 60Ω OUT GENEATO (NOTE 1) 50Ω CL = 50pF (NOTE ) L = 110Ω C L = 15pF (NOTE ) Figure 3: river ifferential Output elay and Transition Time Circuit. VOH = + VOL Figure 4: river Enable and isable Timing Circuit, Output High O 3V GENEATO (NOTE 1) 50Ω Figure 5: river Enable and isable Timing Circuit, Output Low S1 C L = 50pF (NOTE ) L = 110Ω OUT GENEATO (NOTE 1) 50Ω V I Figure 6: eceiver Propagation elay Test Circuit OUT = CL = 15pF (NOTE ) - S3 GENEATO (NOTE 1) VI 50Ω 1k CL = 15pF (NOTE ) S1 S E = 0 or Vcc I = 0 or Vcc A/Y B/Z IOS 100Ω -7V to +1V V Figure 7: eceiver Enable and isable Timing Circuit Figure 8: river Short Circuit Current Limit Test 7/1

8 Switching Waveforms 3V INPUT Y OUTPUT VOH tplh tphl IN to1 to 3V Z OUTPUT VOL VOH tphl tplh OUT 90% 90% 50% 50% 10% 10%. -. VOL tt tt = VOH + VOL Figure 9: river Propagation elay Waveforms Figure 10: river ifferential Output elay and Transition Time Waveforms E OUTPUT HIGH 3V VOH tpzh tphz 0.5V INPUT 3V tplh tphl OUTPUT LOW VOL tpzl tplz 0.5V OUTPUT = VOH + VOL Figure 11: river Enable and isable Timing Waveforms = Figure 1: eceiver Propagation elay Waveforms EB OUTPUT 3V VOH S1 is open S is closed S3 = tphz 10% tpzh tpsh EB OUTPUT 3V VOL Figure 13: eceiver Enable and isable Waveforms S1 is closed S is open S3 = - 10% tplz tpzl tpsl NOTES 1. The input pulse is supplied by a generator with the following characteristics: P = 50kHz, 50% duty cycle, t < 6.0ns, Z O = 50Ω.. C L includes probe and stray capacitance. 8/1

9 escription The SP3490 and SP3491 are two members in the family of 3.3V low power full-duplex transceivers that meet the electrical specifications of the S-485 and S-4 serial protocols. These devices are pin-to-pin compatible with the MaxLinear SP490 and SP491 devices as well as popular industry standards. The SP3490 and SP3491 feature MaxLinear s BiCMOS process allowing low power operation without sacrificing performance. The S-485 standard is ideal for multi-drop applications and for long-distance interfaces. S-485 allows up to 3 drivers and 3 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, S-485 transceivers are equipped with a wide (-7V to 1V) common mode range to accommodate ground potential differences. Because S-485 is a differential interface, data is virtually immune to noise in the transmission line. eceivers The receivers of the SP3490 and SP3491 have differential inputs with an input sensitivity of ±00mV. Input impedance of the receivers is typically 15kΩ (1kΩ minimum). A wide common mode range of -7V to 1V allows for large ground potential differences between systems. The receivers for both the SP3490 and SP3491 are equipped with a failsafe feature that guarantees the receiver output will be in a HIGH state when the input is left unconnected. The receiver of the SP3491 has a enable control line which is active LOW. A logic LOW on EB (pin 3) of the SP3491 will enable the differential receiver. A logic HIGH on EB (pin 3) of the SP3491 will tri-state the receiver. rivers The drivers for both the SP3490 and SP3491 have differential outputs. The typical voltage output swing with no load will be 0 volts to Vcc. With worst case loading of 54Ω across the differential outputs, the drivers can maintain greater than voltage levels. The driver of the SP3491 has a driver enable control line which is active HIGH. A logic HIGH on E (pin 4) of the SP3491 will enable the differential driver outputs. A logic LOW on the E (pin 4) will tri-state the driver outputs. The SP3490 does not have a driver enable. 9/1

10 Mechanical imensions NSOIC8 Top View Side View Front View rawing No: evision: A PO /1

11 Mechanical imensions NSOIC14 Top View Side View Front View rawing No: PO evision: A 11/1

12 Ordering Information (1) Part Number Operating Temperature ange Lead-Free Package Packaging Method SP3490CN-L/T 0 C to 70 C eel SP3490EN-L SP3490EN-L/T -40 C to 85 C 8-pin NSOIC Tube eel SP3491CN-L SP3491CN-L/T SP3491EN-L SP3491EN-L/T 0 C to 70 C -40 C to 85 C Yes () 14-pin NSOIC Tube eel Tube eel NOTE: 1. efer to and for most up-to-date Ordering Information.. Visit for additional information on Environmental ating. evision History evision ate escription 10/11/0 -- Legacy Sipex atasheet 06/08/ Convert to Exar Format. Update ordering information as a result of discontinued Lead type package options per PN Change revision to Add new Figure 8 - river Short Circuit Current Limit Test Circuit 9/14/ Correct package type for SP3491 options in ordering table from 8 pin NSOIC to 14 pin NSOIC 10/7/ /06/ Add ES protection levels of +/-kv. emove SP3490 Supply Current rating for E = (No driver enable for SP3490). Update to MaxLinear logo. Update pin description table to include note on NC pin. emove GN from ifferential Output Voltage min (page and 4). Added maximum junction temperature, package power dissipation and ES rating. Update format and ordering information table. Corporate Headquarters: 5966 La Place Court Suite 100 Carlsbad, CA 9008 Tel.:+1 (760) Fax: +1 (760) High Performance Analog: 4870 Kato oad Fremont, CA Tel.: +1 (510) Fax: +1 (510) serialtechsupport@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. 017 MaxLinear, Inc. All rights reserved SP3490_SP3491_S_ /1