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february 2008 rev 5 1/17 17 ST490AB low power high speed rs-485/rs-422 transceiver features low supply current: 5 ma max -7 v to 12 v common mode input voltage range 70 mv typical input hysteresis designed for 25 mbps operation operate from a single 5 v supply 4 kv esd protection current limiting and thermal shutdown for driver overload protection description the st490a is a low power transceiver for rs- 485 and rs-422 communications. the device contains one driver and one receiver in full duplex configuration. the st490a draws 5 ma (typ.) of supply current when unloaded or fully loaded with disabled drivers. it operates from a single 5 v supply. 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 receiver input has a fail-safe feature that guarantees a logic high output if both inputs are open circuit. dip-8 so-8 table 1. device summary order code temperature range package packaging ST490ABn -40 to 85 c dip-8 50 parts per tube / 40 tube per box ST490ABdr -40 to 85 c so-8 (tape and reel) 2500 parts per reel www.st.com
contents ST490AB 2/17 contents 1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
ST490AB pin configuration 3/17 1 pin configuration figure 1. pin connections table 2. pin description pin n symbol name and function 1v cc supply voltage 2 ro receiver output 3 di driver input 4 gnd ground 5 y non-inverting driver output 6 z inverting driver output 7 b inverting receiver input 8 a non-inverting receiver input
truth tables ST490AB 4/17 2 truth tables note: x = don?t care; z = high impedance note: x = don?t care; z = high impedance table 3. truth table (driver) inputs outputs di y z llh hhl table 4. truth table (receiver) differential inputs outputs a-b ro -0.2v h between -0.2v to 0.2v ? -0.2v l open h
ST490AB maximum ratings 5/17 3 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. table 5. absolute maximum ratings symbol parameter value unit v cc supply voltage 7 v v di driver input voltage -0.5 to 7 v v y , v z driver output voltage -7.5 to 12.5 v v a , v b receiver input voltage -7.5 to 12.5 v v ro receiver output voltage -0.3 to (v cc + 0.3) v esd human body model 3.5 kv
electrical characteristics ST490AB 6/17 4 electrical characteristics table 6. electrical characteristics (v cc = 4.5 v to 5.5 v, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c) symbol parameter min. typ. max. unit i supply no load supply current 2 5 ma c in input capacitance 1.8 pf c yz driver output capacitance 1.2 pf c out output capacitance 2.3 pf table 7. transmitter electrical characteristics (v cc = 4.5 v to 5.5 v, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c) symbol parameter test conditions min. typ. max. unit v od1 differential drive output (no load) v cc v v od2 differential drive output (with load) r l = 54 (rs-422) ( figure 1 )1.52.65 v v od3 differential drive output (with load) r l = 100 (rs-422) ( figure 1 )2 3 v v od change in magnitude of driver differential output voltage for complementary output states r l = 54 or 100 ( figure 1 )00.2v v oc driver common mode output voltage r l = 54 ( figure 1 )13v v oc change in magnitude of driver common mode output voltage r l = 54 ( figure 1 )00.2v i off power off output current v cc = 0v, v o =-7v to 12v 100 a i osd driver short circuit output current v o =-7v to 12v 35 250 ma v il input logic threshold low 0.8 v v ih input logic threshold high 2 v
ST490AB electrical characteristics 7/17 table 8. receiver electrical characteristics (v cc = 4.5 v to 5.5 v, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c) symbol parameter test conditions min. typ. max. unit i in1 logic input current 2.0 a i in2 input current (a, b) other input=0v v cc = 0 or 5.25v v in =12v 0.5 1 ma v in =-7v -0.35 -0.8 ma v th receiver differential threshold voltage v cm = -7v to 12v -0.2 0.2 v v th receiver input hysteresis v cm = 0v 70 mv v oh receiver output high voltage i out = -8ma, v id = 200mv 3.5 4.7 v v ol receiver output low voltage i out = 8ma, v id = -200mv 0.2 0.4 v r rin receiver input resistance v cm = -7v to 12v 12 24 k i osr receiver short-circuit current v o = 0v to v cc 795ma table 9. driver switching characteristics (v cc = 4.5 v to 5.5 v, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c) symbol parameter test conditions min. typ. max. unit d r maximum data rate jitter <5% 25 50 mbps t plh t phl propagation delay input to output r l = 54 , c l1 =c l2 =50pf, ( figure 1 )1016ns t skew differential output delay skew r l = 54 , c l1 =c l2 =50pf, ( figure 1 )13ns t tlh t thl rise or fall differential time r l = 54 , c l1 =c l2 =50pf, ( figure 1 )812ns table 10. receiver switching characteristics (v cc = 4.5 v to 5.5 v, t a = -40 to 85 c, unless otherwise specified. typical values are referred to t a = 25 c) symbol parameter test conditions min. typ. max. unit t plh t phl propagation delay input to output c l = 15pf, ( figure 2 , figure 4 )1930ns t skd |t plh - t phl | receiver output skew c l = 15pf, ( figure 2 , figure 4 )13ns t tlh t thl rise or fall time c l = 15pf, ( figure 2 , figure 4 )8ns
test circuit and typical characteristics ST490AB 8/17 5 test circuit and typical characteristics figure 2. driver dc test load figure 3. drive/receiver timing test circuit
ST490AB test circuit and typical characteristics 9/17 figure 4. driver propagation delay figure 5. receiver propagation delay
test circuit and typical characteristics ST490AB 10/17 figure 6. receiver output current vs. output low voltage (output low) figure 7. receiver output current vs. output high voltage (output high) figure 8. driver diff. output voltage vs common mode voltage (diff. output low) figure 9. driver diff. output voltage vs common mode voltage (diff. output high) figure 10. driver short circuit current vs line voltage (output high) figure 11. receiver high level output voltage vs. temperature
ST490AB test circuit and typical characteristics 11/17 figure 12. receiver input current vs input voltage
package mechanical data ST490AB 12/17 6 package mechanical data in order to meet environmental requirements, st offers these devices in ecopack? 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
ST490AB package mechanical data 13/17 dim. mm. inch. min. typ. max. min. typ. max. a 3 . 3 0.1 3 0 a 1 0.7 0.02 8 b1. 39 1.65 0.055 0.065 b1 0. 9 1 1.04 0.0 3 6 0.041 b 0.5 0.020 b 10. 38 0.5 0.015 0.020 d 9 . 8 0. 38 6 e 8 . 8 0. 3 46 e 2.54 0.100 e 3 7.62 0. 3 00 e4 7.62 0. 3 00 f 7.1 0.2 8 0 i4. 8 0.1 89 l 3 . 3 0.1 3 0 z 0.44 1.6 0.017 0.06 3 pla s tic dip- 8 mechanical data p001f
package mechanical data ST490AB 14/17 dim. mm. inch. min. typ. max. min. typ. max. a1. 3 5 1.75 0.05 3 0.06 9 a1 0.10 0.25 0.04 0.010 a2 1.10 1.65 0.04 3 0.065 b0. 33 0.51 0.01 3 0.020 c0.1 9 0.25 0.007 0.010 d4. 8 0 5.00 0.1 89 0.1 9 7 e 3 . 8 0 4.00 0.150 0.157 e 1.27 0.050 h5. 8 0 6.20 0.22 8 0.244 h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 k 8 (m a x.) ddd 0.1 0.04 s o- 8 mechanical data 001602 3 /c
ST490AB package mechanical data 15/17 dim. mm. inch. min. typ. max. min. typ. max. a 33 0 12. 99 2 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 22.4 0. 88 2 ao 8 .1 8 .5 0. 3 1 9 0. 33 5 bo 5.5 5. 9 0.216 0.2 3 2 ko 2.1 2. 3 0.0 8 2 0.0 9 0 po 3 . 9 4.1 0.15 3 0.161 p7. 98 .1 0. 3 11 0. 3 1 9 tape & reel s o- 8 mechanical data
revision history ST490AB 16/17 7 revision history table 11. document revision history date revision changes 06-jul-2005 2 typing error on table 2 - pin 5 non-inverting, pin 6 inverting. 04-may-2006 3 order codes updated. 08-nov-2007 4 added: ta b l e 1 . 07-feb-2008 5 modified: table 1 on page 1 .
ST490AB 17/17 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 he rein 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 as sumes 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. i f 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 whatsoev er 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 parti cular 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 milita ry, 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 whatsoev er, 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. ? 2008 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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