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| ST485ER 15KV ESD protected, Low power RS-485/RS-422 transceiver General features Low quiescent current: 300A Designed for RS-485 interface application -7V to 12V common mode input voltage range Driver maintains high impedance in 3-state or with the power OFF 70mV tipycal input hysteresis 30ns propagation delay, 5ns skew Operate from a single 5V supply Current limiting and thermal shutdown for driver overload protection ESD protection: - 15KV (H.B.M.) - 8KV (IEC-1000-4-2 contact discharge) Allows up to 256 transceivers on the bus latchup. These parts contain one driver and one receiver. This transceiver draws 300A (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5V supply. 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. The ST485E is designed for bi-directional data communications on multipoint bus transmission line (half-duplex applciations). DIP-8 SO-8 Description The ST485E is al low power transceiver for RS485 and RS-422 communication. Each driver output and receiver input is protected against 15KV electrostatic discharge (H.B.M.) 8KV (IEC-1000-4-2 contact discharge) shocks, without Order code Part number ST485ERBN ST485ERBDR October 2006 Temperature range -40 to 85 C -40 to 85 C Package DIP-8 SO-8 (Tape & reel) Rev 5 Packaging 50parts per tube / 40tube per box 2500 parts per reel 1/19 www.st.com 19 Contents ST485ER Contents 1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 3 4 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 4.2 4.3 DC Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Driver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Receiver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 6 7 Test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19 ST485ER Pin settings 1 Pin settings Figure 1. Pin configuration 1.1 Pin description Table 1. 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 3/19 Truth tables ST485ER 2 Truth tables Table 2. 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: X = Don't care; Z = High impedance Table 3. 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 4/19 ST485ER Maximum ratings 3 Maximum ratings Table 4. Symbol VCC VI VDI VDO VRI VRO 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) Absolute maximum ratings Parameter 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 condition is not implied. V+ and V- can have a maximum magnitude of +7V, but their absolute addition can not exceed 13 V. 5/19 Electrical characteristics ST485ER 4 Electrical characteristics Table 5. Symbol ESD ESD 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 4.1 DC Electrical characteristics VCC = 5V 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25C) Table 6. DC Electrical characteristics Symbol VOD1 VOD2 Parameter Differential driver output (no load) Differential driver output (with load) Change in magnitude of driver differential output voltage for complementary output states Driver common-mode output voltage RL = 27 (RS-485) (Figure 2.) RL = 50 (RS-422) (Figure 2.) 1.5 Test conditions (1) Min. Typ. Max. 5 5 5 Unit V V V VOD RL = 27 or 50 (Figure 2.) 0.2 V VOC RL = 27 or 50 (Figure 2.) 3 V VOC Change in magnitude of driver common-mode output RL = 27 or 50 (Figure 2.) voltage for complementary output states Input high voltage Input low voltage Input current Input current (A, B) Receiver differential threshold voltage Receiver input hysteresis Receiver output high voltage RE, DE, DI RE, DE, DI RE, DE, DI VCM = 0V or 5.25VVDE = 0V VIN = 12V VIN = -7V VCM = -7 to 12V VCM = 0V IO = -4mAVID = 200mV 3.5 -0.2 70 2.0 0.2 V VIH VIL IIN1 IIN2 V 0.8 2 1 -0.8 0.2 V A mA mA V mV V 0.4 1 V A K VTH VTH VOH VOL IOZR RIN Receiver output low voltage IO = 4mAVID = -200mV 3-State (high impedance) output current at receiver Receiver input resistance VO = 0.4 to 2.4V VCM = -7 to 12V 24 6/19 ST485ER Table 6. Symbol ICC Electrical characteristics DC Electrical characteristics Parameter No load supply current (2) Driver short-circuit current, VO=High Driver short-circuit current, VO=Low Receiver short-circuit current Test conditions (1) VRE = 0V or VCC VDE = VCC VDE = 0V VO = -7 to 12V (3) VO = -7 to 12V (3) VO = 0V to VCC 35 35 7 Min. Typ. 400 300 Max. 900 500 250 250 95 Unit A A mA mA mA IOSD1 IOSD2 IOSR 1. All currents into device pins are positive; all cuttents 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 = 0V 3. Applies to peak current. See typical Operating Characteristics. 4.2 Driver switching characteristics VCC = 5V 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25C Table 7. Symbol tPLH tPHL tSK tTLH tTHL tPZH tPZL tPLZ tPHZ CAB Driver switching characteristics Parameter Propagation Delay Input to Output Output Skew to Output Rise or Fall Time Output Enable Time Output Enable Time Output Disable Time Output Disable Time Output AB Capacitance Test conditions (1) RDIFF = 54CL1 = CL2 = 100pF (See Figure 4. and Figure 6.) RDIFF = 54CL1 = CL2 = 100pF (See Figure 4. and Figure 6.) RDIFF = 54CL1 = CL2 = 100pF (See Figure 4. and Figure 6.) CL = 100pFS2 = Closed (See Figure 5. and Figure 7.) CL = 100pFS1 = Closed (See Figure 5. and Figure 7.) CL = 15pFS1 = Closed (See Figure 5. and Figure 7.) CL = 15pFS2 = Closed (See Figure 5. and Figure 7.) 3 Min. 10 Typ. 30 5 15 70 70 70 70 43 Max. 60 10 40 90 90 90 90 Unit ns ns ns ns ns ns ns pF 1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground unless specified. 7/19 Electrical characteristics ST485ER 4.3 Receiver switching characteristics VCC = 5V 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25C) Table 8. Symbol tPLH tPHL tSKD tPZH tPZL tPLZ tPHZ fMAX Receiver switching characteristics Parameter Test conditions (1) Min. 20 Typ. 130 13 20 20 20 20 2.5 50 50 50 50 Max. 210 Unit ns ns ns ns ns ns Mbps Propagation Delay Input RDIFF = 54CL1 = CL2 = 100pF to Output (See Figure 4. and Figure 8.) Differential Receiver Skew Output Enable Time Output Enable Time Output Disable Time Output Disable Time Maximum Data Rate RDIFF = 54CL1 = CL2 = 100pF (See Figure 4. and Figure 8.) CRL = 15pFS1 = Closed (See Fig. 2 and Figure 9.) CRL = 15pFS2 = Closed (See Fig. 2 and Figure 9.) CRL = 15pFS1 = Closed (See Fig. 2 and Figure 9.) CRL = 15pFS2 = Closed (See Fig. 2 and Figure 9.) 1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground unless specified 8/19 ST485ER Test circuit and typical characteristics 5 Test circuit and typical characteristics Figure 2. Driver DC test load Figure 3. Receiver timing test load Figure 4. Drive/receiver timing test circuit Figure 5. Driver timing test load 9/19 Test circuit and typical characteristics Figure 6. Driver propagation delay ST485ER Figure 7. Driver enable and disable time 10/19 ST485ER Figure 8. Receiver propagation delay Test circuit and typical characteristics Figure 9. Receiver Enable and Disable Time 11/19 Test circuit and typical characteristics Figure 10. Receiver output current vs. output low voltage ST485ER 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 12/19 ST485ER Figure 16. Receiver low level output voltage vs. temperature Test circuit and typical characteristics Figure 17. Differential driver output voltage vs. temperature 13/19 Package mechanical data ST485ER 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 14/19 ST485ER Package mechanical data 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 15/19 Package mechanical data ST485ER 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 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 8 (max.) 0.04 0016023/C 16/19 ST485ER Package mechanical data 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 17/19 Revision history ST485ER 7 Table 9. Date Revision history Revision history Revision 3 4 5 Changes Order codes has been updated and new template. Mistake in cover page description 300mA ==> 300A. Order codes has been updated. 21-Mar-2006 01-Aug-2006 25-Oct-2006 18/19 ST485ER 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) 2006 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 19/19 |
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