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november 2007 rev 3 1/22 22 st1480ab ST1480AC 3.3 v powered, 15 kv esd protected, up to 12 mbps true 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 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, shorted or terminated inputs with no signal present allow up to 64 transceivers on the bus description the st1480a 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 st1480a 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. 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 st1480a input has a true fail-safe feature that guarantees a logic high output if both inputs are open circuit, shorted together or in the presence of a termination with no signal on the bus. so-8 dip-8 figure 1. device summary part number temperature range package packaging ST1480ACn 0 to 70 c dip-8 50 parts per tube / 40 tube per box ST1480ACdr 0 to 70 c so-8 (tape & reel) 2500 parts per reel st1480abdr -40 to 85 c so-8 (tape & reel) 2500 parts per reel www.st.com
contents st1480ab - ST1480AC 2/22 contents 1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 test circuits and typica l characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
st1480ab - ST1480AC pin configuration 3/22 1 pin configuration figure 2. pin connections table 1. pin description pin n symbol name and function 1 ro receiver output. if a>b by 200mv, ro will be high; if a truth tables st1480ab - ST1480AC 4/22 2 truth tables note: x= don?t care; z=high impedance note: x= don?t care; z=high impedance table 2. truth table (driver) inputs outputs mode re de di b a xhhlh normal xhlhl normal llxzz normal h l x z z shutdown table 3. truth table (receiver) inputs output mode re de a-b ro ll -0.015v h normal ll -0.2v l normal l l inputs open h normal l l inputs shorted h normal h l x z shutdown
st1480ab - ST1480AC maximum ratings 5/22 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 4. absolute maximum ratings symbol parameter value unit v cc supply voltage 7 v v i control input voltage (re , de) -0.3 to 7 v v di driver input voltage (di) -0.3 to 7 v v do driver output voltage (a, b) 14 v v ri receiver input voltage (a, b) 14 v v ro receiver output voltage (ro) -0.3 to (v cc + 0.3) v table 5. esd performance: transmitter outputs, receiver inputs symbol parameter test conditions min. typ. max. unit esd esd protection voltage human body model 15 kv esd esd protection voltage iec-1000-4-2 contact discharge 8kv
electrical characteristics st1480ab - ST1480AC 6/22 4 electrical characteristics table 6. electrical characteristics v cc = 3 v to 3.6 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 supply v cc power supply current no load, di=0v or v cc de=v cc , re =0v or v cc 1.3 2.2 ma de=0v, re =0v 1.2 1.9 ma i shdn shutdown supply current de=0v, re=v cc , di=0v or v cc 0.002 1 a table 7. logic input electrical characteristics v cc = 3 v to 3.6 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 il input logic threshold low de, di, re 1.3 0.8 v v ih input logic threshold high de, di, re 2 v i in1 logic input current de, di, re 2.0 a i in2 input current (a, b) de=0v, v cc = 0 or 3.6v v in =12v 1 ma v in =-7v -0.8 ma table 8. transmitter electrical characteristics v cc = 3 v to 3.6 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 od differential drive output r l = 100 (rs-422) ( figure 2 )2 v r l = 54 (rs-485) ( figure 2 )1.5 v r l = 60 (rs-485) ( figure 3 )1.5 v v od change in magnitude of driver differential output voltage for complementary output states ( note: 1 ) r l = 54 or 100 ( figure 2 )0.2v v oc driver common mode output voltage r l = 54 or 100 ( figure 2 )3v v oc change in magnitude of driver common mode output voltage ( note: 1 ) r l = 54 or 100 ( figure 2 )0.2v i osd driver short circuit output current 250 ma
st1480ab - ST1480AC electrical characteristics 7/22 table 9. receiver electrical characteristics v cc = 3v to 3.6v, t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c) symbol parameter test conditions min. typ. max. unit v th receiver differential threshold voltage v cm = -7v to 12v, de = 0 -0.2 -0.015 v v th receiver input hysteresis v cm = 0v 30 v v oh receiver output high voltage i out = -4ma, v id = 200mv, ( figure 9 )2 v v ol receiver output low voltage i out = 4ma, v id = -200mv, ( figure 4 )0.4v i ozr 3-state (high impedance) output current at receiver v cc = 3.6v, v o = 0v to v cc 1a r rin receiver input resistance v cm = -7v to 12v 24 k i osr receiver short-circuit current v ro = 0v to v cc 760ma table 10. driver switching characteristics v cc = 3v to 3.6v, t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c) symbol parameter test conditions min. typ. max. unit d r maximum data rate 12 15 mbps t dd differential output delay r l = 60 , c l = 15pf, ( figure 5 and figure 6 ) 18 30 ns t td differential output transition time r l = 60 , c l = 15pf, ( figure 5 and figure 6 ) 12 20 ns t plh t phl propagation delay r l = 27 , c l = 15pf, ( figure 9 and figure 10 ) 18 30 ns t pds |t plh - t phl | propagation delay skew ( note 2 ) r l = 27 , c l = 15pf, ( figure 9 and figure 10 ) 25ns t pzl output enable time r l = 110 , ( figure 11 and figure 12 )1935ns t pzh output enable time r l = 110 , ( figure 7 and figure 8 )3050ns t phz output disable time r l = 110 , ( figure 7 and figure 8 )1935ns t plz output disable time r l = 110 , ( figure 11 and figure 12 )3050ns t skew differential output delay skew 13ns t zh(shdn) driver enable from shutdown to output high 30 50 ns t zl(shdn) driver enable from shutdown to output low 19 35 ns
electrical characteristics st1480ab - ST1480AC 8/22 note: 1 v od and v oc are the changes in v od and v oc , respectively, when the di input changes state. 2 measured on |t plh (a)-t phl (a)| and |t plh (b)-t phl (b)| 3 the transceivers are put into shutdown by bring re high and de low. if the input are in state for less than 80ns, the part are guaranteed not to enter shutdown. if the inputs are in this state for at least 300ns, the parts are guaranteed to have entered shutdown. table 11. receiver switching characteristics v cc = 3v to 3.6v, t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c) symbol parameter test conditions min. typ. max. unit t plh t phl propagation delay v id = 0v to 3v, c l1 =15pf ( figure 13 and figure 14 ) 30 50 ns t rpds |t plh - t phl | propagation delay skew v id = 0v to 3v, c l1 = 15pf ( figure 13 and figure 14 ) 13ns t pzl output enable time c rl = 15pf, ( figure 15 and figure 19 )1020ns t pzh output enable time c rl = 15pf, ( figure 15 and figure 19 )1020ns t phz output disable time c rl = 15pf, ( figure 15 and figure 19 )1020ns t plz output disable time c rl = 15pf, ( figure 15 and figure 19 )1020ns t zh(shdn) receiver enable from shutdown to output high c rl = 15pf, ( figure 15 and figure 19 )1020ns t zl(shdn) receiver enable from shutdown to output low c rl = 15pf, ( figure 15 and figure 19 )2040s
st1480ab - ST1480AC test circuits and typical characteristics 9/22 5 test circuits and typical characteristics figure 3. driver and v oc test load figure 4. driver v od with varying common mode voltage test load figure 5. receiver v oh and v ol test circuit
test circuits and typical characteristics st1480ab - ST1480AC 10/22 figure 6. drive differential output delay transition time test circuit figure 7. drive differential output delay transition time waveform figure 8. drive enable and disable times test circuit
st1480ab - ST1480AC test circuits and typical characteristics 11/22 figure 9. drive enable and disable times waveforms figure 10. drive propagation time test circuit figure 11. drive propagation time waveform
test circuits and typical characteristics st1480ab - ST1480AC 12/22 figure 12. drive enable and disable times test circuit figure 13. drive enable and disable times waveforms figure 14. receiver propagation delay time test circuit
st1480ab - ST1480AC test circuits and typical characteristics 13/22 figure 15. receiver propagation delay time waveforms figure 16. receiver enable and disable times test circuit figure 17. receiver enable and disable times waveform
test circuits and typical characteristics st1480ab - ST1480AC 14/22 figure 18. receiver enable and disable times waveform figure 19. receiver enable and disable times waveform figure 20. receiver enable and disable times waveform
st1480ab - ST1480AC test circuits and typical characteristics 15/22 figure 21. receiver output current vs output low voltage figure 22. receiver output current vs output high voltage figure 23. low level driver output capability figure 24. high level driver output capability figure 25. receiver input characteristics figure 26. driver short circuit current
test circuits and typical characteristics st1480ab - ST1480AC 16/22 figure 27. driver short circuit current
st1480ab - ST1480AC package mechanical data 17/22 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
package mechanical data st1480ab - ST1480AC 18/22 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
st1480ab - ST1480AC package mechanical data 19/22 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
package mechanical data st1480ab - ST1480AC 20/22 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
st1480ab - ST1480AC revision history 21/22 7 revision history table 12. document revision history date revision changes 02-may-2006 2 order codes updated. 19-nov-2007 3 added ta b l e 1 .
st1480ab - ST1480AC 22/22 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. ? 2007 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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