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| ST3485EB ST3485EC 3.3 V powered, 15 kV ESD protected, up to 12 Mbps RS-485/RS-422 transceiver Features ESD protection - 15 kV human body model - 8 kV IEC 1000-4-2 contact discharge Operate from a single 3.3 V supply - no charge pump required Interoperable with 5 V logic 1 A low current shutdown mode max Guaranteed 12 Mbps data rate -7 to 12 V common mode input voltage range Half duplex versions available Industry standard 75176 pinout Current limiting and thermal shutdown for driver overload protection Guaranteed high receiver output state for floating inputs with no signal present Allow up to 64 transceivers on the bus Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. DIP-8 SO-8 Description The ST3485E is 15 kV ESD protected, 3.3 V low power transceiver for RS-485 and RS-422 communications. The device contains one driver and one receiver in half duplex configuration. The ST3485E transmits and receives at a guaranteed data rate of at least 12 Mbps. All transmitter outputs and receiver inputs are protected to 15 kV using Human Body Model. Table 1. Device summary Temperature range 0 to 70 C 0 to 70 C -40 to 85 C Package DIP-8 SO-8 (tape and reel) SO-8 (tape and reel) Packaging 50 parts per tube / 40 tube per box 2500 parts per reel 2500 parts per reel Order code ST3485ECN ST3485ECDR ST3485EBDR November 2007 Rev 5 1/22 www.st.com 22 Contents ST3485EB - ST3485EC Contents 1 2 3 4 5 6 7 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Test circuits and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2/22 ST3485EB - ST3485EC Pin configuration 1 Figure 1. Pin configuration Pin connections Table 2. Pin n 1 2 Pin description Symbol RO RE Name and function Receiver output. If A>B by 200mV, RO will be high; if A3 DE 4 5 6 7 8 DI GND A B VCC 3/22 Truth tables ST3485EB - ST3485EC 2 Table 3. Truth tables Truth table (driver) Inputs RE X X L H DE H H L L DI H L X X B L H Z Z Outputs Mode A H L Z Z Normal Normal Normal Shutdown Note: Table 4. X= Don't care; Z=High impedance Truth table (receiver) Inputs Output Mode A-B 0.2V -0.2V Inputs Open X RO H L H Z Normal Normal Normal Shutdown RE L L L H DE L L L L Note: X= Don't care; Z=High impedance 4/22 ST3485EB - ST3485EC Maximum ratings 3 Table 5. Symbol VCC VI VDI VDO VRI VRO Maximum ratings Absolute maximum ratings Parameter Supply voltage Control input voltage (RE, DE) Driver input voltage (DI) Driver output voltage (A, B) Receiver input voltage (A, B) Receiver output voltage (RO) Value 7 -0.3 to 7 -0.3 to 7 14 14 -0.3 to (VCC + 0.3) Unit V V V V V V Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. ESD performance: transmitter outputs, receiver inputs Parameter ESD protection voltage ESD protection voltage Test conditions Human body model IEC-1000-4-2 Contact discharge Min. Typ. 15 8 Max. Unit kV kV Table 6. Symbol ESD ESD 5/22 Electrical characteristics ST3485EB - ST3485EC 4 Table 7. Electrical characteristics Electrical characteristics VCC = 3 V to 3.6 V, TA = -40 to 85 C, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Test conditions DE=VCC, RE=0V or VCC DE=0V, RE=0V Min. Typ. 1.3 1.2 0.002 Max. 2.2 1.9 1 Unit mA mA A Symbol ISUPPLY VCC Power supply current No Load, DI=0V or VCC ISHDN Shutdown supply current DE=0V, RE=VCC, DI=0V or VCC Table 8. Logic input electrical characteristics VCC = 3 V to 3.6 V, TA = -40 to 85 C, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Input logic threshold low Input logic threshold high Logic input current Input current (A, B) Test conditions DE, DI, RE DE, DI, RE DE, DI, RE DE=0V, VCC= 0 or 3.6V VIN=12V VIN=-7V 2 2.0 1 -0.8 Min. Typ. 1.3 Max. 0.8 Unit V V A mA mA Symbol VIL VIH IIN1 IIN2 Table 9. Transmitter electrical characteristics VCC = 3 V to 3.6 V, TA = -40 to 85 C, unless otherwise specified. Typical values are referred to TA = 25C) Parameter Test conditions RL= 100 (RS-422) (Figure 1) Min. 2 1.5 1.5 Typ. Max. Unit V V V Symbol VOD Differential drive output RL= 54 (RS-485) (Figure 1) RL= 60 (RS-485) (Figure 2) VOD Change in magnitude of driver differential output voltage for RL= 54 or 100 (Figure 1) complementary output states (Note: 1) Driver common mode output voltage RL= 54 or 100 (Figure 1) 0.2 V VOC VOC 3 V Change in magnitude of driver common mode output voltage RL= 54 or 100 (Figure 1) (Note: 1) Driver short circuit output current 0.2 V IOSD 250 mA 6/22 ST3485EB - ST3485EC Electrical characteristics Table 10. Receiver electrical characteristics VCC = 3 V to 3.6 V, TA = -40 to 85 C, unless otherwise specified. Typical values are referred to TA = 25C) Parameter Receiver differential threshold voltage Receiver input hysteresis Receiver output high voltage Receiver output low voltage 3-State (high impedance) output current at receiver Receiver input resistance Receiver short-circuit current Test conditions VCM = -7V to 12V, DE = 0 VCM = 0V IOUT = -4mA, VID = 200mV (Figure 8 and Figure 9) IOUT = 4mA, VID = -200mV, (Figure 3) VCC = 3.6V, VO = 0V to VCC VCM = -7V to 12V VRO = 0V to VCC 24 7 60 2 0.4 1 Min. -0.2 70 Typ. Max. 0.2 Unit V V V V A k mA Symbol VTH VTH VOH VOL IOZR RRIN IOSR Table 11. Driver switching characteristics VCC = 3 V to 3.6 V, TA = -40 to 85 C, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Maximum data rate Differential output delay Differential output transition time Propagation delay |tPLH - tPHL| Propagation delay skew (Note 2) Output enable time Output enable time Output disable time Output disable time Differential output delay skew Driver enable from shutdown to output high Driver enable from shutdown to output low , RL= 60 CL = 15pF, (Figure 4 and Figure 5) RL= 60 CL = 15pF, (Figure 4 and , Figure 5) RL= 27 CL = 15pF, (Figure 8 and , Figure 9) RL= 27 CL = 15pF, (Figure 8 and , Figure 9) RL= 110 (Figure 10 and Figure 11) , RL= 110 (Figure 6 and Figure 7) , RL= 110 (Figure 6 and Figure 7) , RL= 110, (Figure 10 and Figure 11) Test conditions Min. 12 Typ. 15 18 12 18 2 19 30 19 30 1 30 19 30 20 30 5 35 50 35 50 3 50 35 Max. Unit Mbps ns ns ns ns ns ns ns ns ns ns ns Symbol DR tDD tTD tPLH tPHL tPDS tPZL tPZH tPHZ tPLZ tSKEW tZH(SHDN) tZL(SHDN) 7/22 Electrical characteristics ST3485EB - ST3485EC Table 12. Receiver switching characteristics VCC = 3 V to 3.6 V, TA = -40 to 85 C, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Propagation delay |tPLH - tPHL| Propagation delay skew Output enable time Output enable time Output disable time Output disable time Receiver enable from shutdown to output high Receiver enable from shutdown to output low Test conditions VID =0V to 3V, CL1 = 15pF (Figure 12 and Figure 13) VID =0V to 3V, CL1 = 15pF (Figure 12 and Figure 13) CRL = 15pF, (Figure 14 and Figure 18) CRL = 15pF, (Figure 14 and Figure 18) CRL = 15pF, (Figure 14 and Figure 18) CRL = 15pF, (Figure 14 and Figure 18) CRL = 15pF, (Figure 14 and Figure 18) CRL = 15pF, (Figure 14 and Figure 18) Min. Typ. 30 1 10 10 10 10 10 20 Max. 50 3 20 20 20 20 20 40 Unit ns ns ns ns ns ns ns s Symbol tPLH tPHL tRPDS tPZL tPZH tPHZ tPLZ tZH(SHDN) tZL(SHDN) Note: 1 2 3 VOD and VOC are the changes in VOD and VOC, respectively, when the DI input changes state. Measured on |tPLH(A)-tPHL(A)| and |tPLH(B)-tPHL(B)| The transceivers are put into shutdown by bring RE high and DE low. If the input are in state for less than 80 ns, the part are guaranteed not to enter shutdown. If the inputs are in this state for at least 300 ns, the parts are guaranteed to have entered shutdown. 8/22 ST3485EB - ST3485EC Test circuits and typical characteristics 5 Figure 2. Test circuits and typical characteristics Driver and VOC test load Figure 3. Driver VOD with varying common mode voltage test load Figure 4. Receiver VOH and VOL test circuit 9/22 Test circuits and typical characteristics ST3485EB - ST3485EC Figure 5. Drive differential output delay transition time test circuit Figure 6. Drive differential output delay transition time waveform Figure 7. Drive enable and disable times test circuit 10/22 ST3485EB - ST3485EC Test circuits and typical characteristics Figure 8. Drive enable and disable times waveforms Figure 9. Drive propagation time test circuit Figure 10. Drive propagation time waveform 11/22 Test circuits and typical characteristics ST3485EB - ST3485EC Figure 11. Drive enable and disable times test circuit Figure 12. Drive enable and disable times waveforms Figure 13. Receiver propagation delay time test circuit 12/22 ST3485EB - ST3485EC Test circuits and typical characteristics Figure 14. Receiver propagation delay time waveforms Figure 15. Receiver enable and disable times test circuit Figure 16. Receiver enable and disable times waveform 13/22 Test circuits and typical characteristics ST3485EB - ST3485EC Figure 17. Receiver enable and disable times waveform Figure 18. Receiver enable and disable times waveform Figure 19. Receiver enable and disable times waveform 14/22 ST3485EB - ST3485EC Test circuits and typical characteristics Figure 20. Receiver output current vs output low voltage Figure 21. Receiver output current vs output high voltage Figure 22. Low level driver output capability Figure 23. High level driver output capability Figure 24. Receiver input characteristics Figure 25. Driver short circuit current 15/22 Test circuits and typical characteristics Figure 26. Driver short circuit current ST3485EB - ST3485EC 16/22 ST3485EB - ST3485EC Package mechanical data 6 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com 17/22 Package mechanical data ST3485EB - ST3485EC Plastic DIP-8 mechanical data mm. Dim. Min. A a1 B B1 b b1 D E e e3 e4 F I L Z 0.44 3.3 1.6 0.017 8.8 2.54 7.62 7.62 7.1 4.8 0.130 0.063 0.38 0.7 1.39 0.91 0.5 0.5 9.8 0.346 0.100 0.300 0.300 0.280 0.189 0.015 1.65 1.04 Typ. 3.3 0.028 0.055 0.036 0.020 0.020 0.386 0.065 0.041 Max. Min. Typ. 0.130 Max. inch. P001F 18/22 ST3485EB - ST3485EC Package mechanical data SO-8 mechanical data Dim. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. Min. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 8 (max.) 0.04 0.228 0.010 0.016 Typ. Max. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 Min. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050 inch. Typ. Max. 0.069 0.010 0.065 0.020 0.010 0.197 0.157 0016023/C 19/22 Package mechanical data ST3485EB - ST3485EC Tape & reel SO-8 mechanical data mm. Dim. Min. A C D N T Ao Bo Ko Po P 8.1 5.5 2.1 3.9 7.9 12.8 20.2 60 22.4 8.5 5.9 2.3 4.1 8.1 0.319 0.216 0.082 0.153 0.311 Typ. Max. 330 13.2 0.504 0.795 2.362 0.882 0.335 0.232 0.090 0.161 0.319 Min. Typ. Max. 12.992 0.519 inch. 20/22 ST3485EB - ST3485EC Revision history 7 Table 13. Date Revision history Document revision history Revision 2 3 4 5 Changes Mistake on table 12 tZL(SHDN) ms ==> s. Remove (TRUE) on title, description has been updated in cover page. The VTH and VTH values are changed in table 10. Order codes updated. Added Table 1. 20-Jun-2005 30-Aug-2005 07-Apr-2006 12-Nov-2007 21/22 ST3485EB - ST3485EC Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2007 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 22/22 |
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