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| ST485EB ST485EC - ST485EX 15 kV ESD protected, low power RS-485/RS-422 transceiver Features Low quiescent current: 300 A Designed for RS-485 interface application -7 V to 12 V common mode input voltage range Driver maintains high impedance in 3-state or with the power OFF 70 mV typical input hysteresis 30 ns propagation delay, 5 ns skew Operates from a single 5 V supply Current limiting and thermal shutdown for driver overload protection ESD protection: - 15 kV (H.B.M.) - 8 kV (IEC-1000-4-2 contact discharge) Allows up to 256 transceivers on the bus Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that place the driver outputs into a high-impedance state. The ST485E is designed for bi-directional data communications on multipoint bus transmission lines (half-duplex applications). SO-8 Description The ST485E is a low power transceiver for RS485 and RS-422 communication. Each driver output and receiver input is protected against 15 kV electrostatic discharge (H.B.M.) (ESD) shocks, without latch-up. These parts contain one driver and one receiver in half duplex configuration. This transceiver draws 300 A (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5 V supply. Table 1. Device summary Temperature range -40 to 85 C 0 to 70 C -40 to 85 C -55 to 125 C Package SO-8 (Tube) SO-8 (Tape and reel) SO-8 (Tape and reel) SO-8 (Tape and reel) Packaging 100parts per tube / 20tube per box 2500 parts per reel 2500 parts per reel 2500 parts per reel Order codes ST485EBD ST485ECDR ST485EBDR ST485EXDR February 2008 Rev 13 1/18 www.st.com 18 Contents ST485EB - ST485EC - ST485EX Contents 1 2 3 4 5 6 7 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2/18 ST485EB - ST485EC - ST485EX Pin configuration 1 Figure 1. Pin configuration Pin connections (top view) Table 2. Pin description Symbol RO RE DE DI GND A B VCC Receiver output Receiver output enable Driver output enable Driver input Ground Non-inverting receiver input and non-inverting driver output Inverting receiver input and inverting driver output Supply voltage Name and function Pin n 1 2 3 4 5 6 7 8 3/18 Truth tables ST485EB - ST485EC - ST485EX 2 Table 3. Truth tables Truth table (driver) Inputs RE X X X DE H H L DI H L X B L H Z Outputs A H L Z Note: Table 4. X = Don't care; Z = High impedance Truth table (receiver) Inputs RE L L L H DE L L L L Outputs A-B +0.2V RO H L H Z -0.2V Inputs open X Note: X = Don't care; Z = High impedance 4/18 ST485EB - ST485EC - ST485EX 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 -0.5 to (VCC + 0.5) -0.5 to (VCC + 0.5) 14 14 -0.5 to (VCC + 0.5) 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 is not implied. V+ and V- can have a maximum magnitude of +7 V, but their absolute addition exceed 13 V. 5/18 Electrical characteristics ST485EB - ST485EC - ST485EX 4 Table 6. Symbol ESD ESD Electrical characteristics ESD performance: transmitter outputs, receiver inputs Parameter ESD protection voltage ESD protection voltage Test conditions Human body model IEC-1000-4-2 Min. 15 8 Typ. Max. Unit kV kV Table 7. Symbol VOD1 VOD2 DC electrical characteristics (VCC = 5 V 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Differential driver output (no load) Differential driver output (with load) Change in magnitude of driver differential output voltage for complementary output states RL = 27 (RS-485) (Figure 2) RL = 50 (RS-422) (Figure 2.) RL = 27 or 50 (Figure 2) 1.5 Test conditions (1) Min. Typ. Max. 5 5 5 Unit V V V VOD 0.2 V VOC Driver common-mode output RL = 27 or 50 (Figure 2) voltage Change in magnitude of driver common-mode output voltage for complementary output states Input high voltage Input low voltage Input current Input current (A, B) Receiver differential threshold voltage Receiver input hysteresis 3 V VOC RL = 27 or 50 (Figure 2) 0.2 V VIH VIL IIN1 IIN2 RE, DE, DI RE, DE, DI RE, DE, DI VCM = 0 V or 5.25 V, VDE = 0 V VIN = 12 V VIN = -7 V VCM = -7 to 12 V VCM = 0 V 2.0 0.8 2 1 -0.8 -0.2 70 3.5 0.4 1 96 400 300 35 900 500 250 0.2 V V A mA mA V mV V V A k A A mA VTH VTH VOH VOL IOZR RIN ICC Receiver output high voltage IO = -4 mA, VID = 200 mV Receiver output low voltage 3-State (high impedance) output current at receiver Receiver input resistance No load supply current (2) Driver short-circuit current, VO=High IO = 4 mA, VID = -200 mV VO = 0.4 to 2.4 V VCM = -7 to 12 V VRE = 0V or VCC VDE = VCC VDE = 0 V VO = -7 to 12 V (3) IOSD1 6/18 ST485EB - ST485EC - ST485EX Table 7. Symbol IOSD2 IOSR Electrical characteristics DC electrical characteristics (continued) (VCC = 5 V 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Driver short-circuit current, VO=Low Test conditions (1) VO = -7 to 12 V (3) Min. 35 7 Typ. Max. 250 95 Unit mA mA Receiver short-circuit current VO = 0 V to VCC 1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground unless specified. 2. Supply current specification is valid for loaded transmitters when VDE = 0 V 3. Applies to peak current. See typical Operating Characteristics. Table 8. Symbol tPLH tPHL tSK tTLH tTHL tPZH tPZL tPLZ tPHZ Driver switching characteristics (VCC = 5 V 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Test conditions (1) Min. Typ. 25 2 15 35 25 25 35 Max. 45 5 40 50 40 40 50 Unit ns ns ns ns ns ns ns Propagation delay input to RDIFF = 54 CL1 = CL2 = 100 pF , output (See Figure 4 and Figure 6) Output skew to output Rise or fall time Output enable time Output enable time Output disable time Output disable time , RDIFF = 54 CL1 = CL2 = 100 pF (See Figure 4 and Figure 6) , RDIFF = 54 CL1 = CL2 = 100 pF (See Figure 4 and Figure 6) CL = 100 pF, S2 = Closed (See Figure 5 and Figure 7) CL = 100 pF, S1 = Closed (See Figure 5 and Figure 7) CL = 15 pF, S1 = Closed (See Figure 5 and Figure 7) CL = 15 pF, S2 = Closed (See Figure 5 and Figure 7) 1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground unless specified. 7/18 Electrical characteristics ST485EB - ST485EC - ST485EX Table 9. Symbol tPLH tPHL tSKD tPZH tPZL tPLZ tPHZ fMAX Receiver switching characteristics (VCC = 5 V 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25 C) Parameter Propagation delay input to output Differential receiver skew Output enable time Output enable time Output disable time Output disable time Maximum data rate Test conditions (1) RDIFF = 54 CL1 = CL2 = 100 pF , (See Figure 4 and Figure 8) RDIFF = 54 CL1 = CL2 = 100 pF , (See Figure 4 and Figure 8) CRL = 15 pF, S1 = Closed (See Figure 2 and Figure 9) CRL = 15 pF, S2 = Closed (See Figure 2 and Figure 9) CRL = 15 pF, S1 = Closed (See Figure 2 and Figure 9) CRL = 15 pF, S2 = Closed (See Figure 2 and Figure 9) 5 Min. Typ. 110 5 11 13 13 11 Max. 130 10 35 35 35 35 Unit ns ns ns ns ns ns Mbps 1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground unless specified 8/18 ST485EB - ST485EC - ST485EX Test circuit and typical characteristics 5 Figure 2. Test circuit and typical characteristics Driver DC test load Figure 3. Receiver timing test load Figure 4. Drive/receiver timing test circuit Figure 5. Driver timing test load 9/18 Test circuit and typical characteristics ST485EB - ST485EC - ST485EX Figure 6. Driver propagation delay Figure 7. Driver enable and disable time 10/18 ST485EB - ST485EC - ST485EX Test circuit and typical characteristics Figure 8. Receiver propagation delay Figure 9. Receiver enable and disable time 11/18 Test circuit and typical characteristics Figure 10. Receiver output current vs output low voltage ST485EB - ST485EC - ST485EX Figure 11. Receiver output current vs output high voltage Figure 12. Driver output current vs output low Figure 13. Driver output current vs output voltage high voltage Figure 14. Supply current vs temperature Figure 15. Receiver high level output voltage vs temperature 12/18 ST485EB - ST485EC - ST485EX Figure 16. Receiver low level output voltage vs temperature Test circuit and typical characteristics Figure 17. Differential driver output voltage vs temperature 13/18 Package mechanical data ST485EB - ST485EC - ST485EX 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 14/18 ST485EB - ST485EC - ST485EX 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 15/18 Package mechanical data ST485EB - ST485EC - ST485EX 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. 16/18 ST485EB - ST485EC - ST485EX Revision history 7 Table 10. Date Revision history Document revision history Revision 9 10 11 12 13 Changes Order codes has been updated and new template. Change value row 10 on the features and RIN in Table 7. Typo mistake on page 1. Change value RIN min. on Table 7. Modified: Table 1 on page 1. 21-Mar-2006 05-Jun-2006 29-Jan-2007 29-Aug-2007 07-Feb-2008 17/18 ST485EB - ST485EC - ST485EX 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) 2008 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 18/18 |
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