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1/17 december 2003 n esd protection: 15kv human body model 8kv iec 1000-4-2 contact discharge n operate from a single 3.3v supply - no charge pump required n interoperable with 5v logic n 1 m a low current shutdown mode max n guaranteed 12 mbps data rate n -7 to 12 common mode input voltage range n half duplex versions available n industry standard 75176 pinout n current limiting and thermal shutdown for driver overload protection n guaranteed high receiver output state for floating inputs with no signal present n allow up to 64 transceivers on the bus description the st3485e is 15kv esd protected, 3.3v 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 12mbps. all transmitter outputs and receiver inputs are protected to 15kv 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 st3485e 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. ordering codes ty pe temperature range package comments st3485ecn 0 to 70 c dip-8 50parts per tube / 40tube per box ST3485EBn -40 to 85 c dip-8 50parts per tube / 40tube per box st3485ecd 0 to 70 c so-8 (tube) 100parts per tube / 20tube per box ST3485EBd -40 to 85 c so-8 (tube) 100parts per tube / 20tube per box st3485ecdr 0 to 70 c so-8 (tape & reel) 2500 parts per reel ST3485EBdr -40 to 85 c so-8 (tape & reel) 2500 parts per reel st3485e 3.3v powered, 15kv esd protected, up to 12mbps true rs-485/rs-422 transceiver dip sop
st3485e 2/17 pin configuration pin description truth table (driver) x= dont care; z=high impedance truth table (receiver) x= dont care; z=high impedance pln n symbol name and function 1ro receiver output. if a>b by 200mv, ro will be high; if a st3485e 3/17 absolute maximum ratings 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 electrical characteristics v cc =3vto3.6v,t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c) logic input electrical characteristics v cc =3vto3.6v,t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c) symbol parameter value unit v cc supply voltage 7v 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 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 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 m a 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 m 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
st3485e 4/17 transmitter electrical characteristics v cc =3vto3.6v,t a = -40 to 85c, unless otherwise specified. typical values are referred to t a =25c) receiver electrical characteristics v cc =3vto3.6v,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 od differential drive output r l = 100 w (rs-422) (figure 1) 2 v r l =54 w (rs-485) (figure 1) 1.5 v r l =60 w (rs-485) (figure 2) 1.5 v d v od change in magnitude of driver differential output voltage for complementary output states (note1) r l =54 w or 100 w (figure 1) 0.2 v v oc driver common mode output voltage r l =54 w or 100 w (figure 1) 3 v d v oc change in magnitude of driver common mode output voltage (note1) r l =54 w or 100 w (figure 1) 0.2 v i osd driver short circuit output current 250 ma 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 d v th receiver input hysteresis v cm =0v 30 v v oh receiver output high voltage i out = -4ma, v id = 200mv, (figures 8,9) 2 v v ol receiver output low voltage i out = 4ma, v id = -200mv, (figure 3) 0.4 v i ozr 3-state (high impedance) output current at receiver v cc = 3.6v v o =0vtov cc 1 m a r rin receiver input resistance v cm = -7v to 12v 24 k w i osr receiver short-circuit current v ro =0vtov cc 760ma
st3485e 5/17 driver switching characteristics v cc =3vto3.6v,t a = -40 to 85c, unless otherwise specified. typical values are referred to t a =25c) receiver switching characteristics v cc =3vto3.6v,t a = -40 to 85c, unless otherwise specified. typical values are referred to t a = 25c) note 1: d v od and d v oc are the changes in v od and v oc , respectively, when the di input changes state. note 2: measured on |t plh (a)-t phl (a)| and |t plh (b)-t phl (b)| note 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 guaran- teed not to enter shutdown. if the inputs are in this state for at least 300ns, the parts are guaranteed to have entered shutdown. symbol parameter test conditions min. typ. max. unit d r maximum data rate 12 15 mbps t dd differential output delay r l =60 w c l = 15pf, (figures 4,5) 18 30 ns t td differential output transition time r l =60 w c l = 15pf, (figures 4,5) 12 20 ns t plh t phl propagation delay r l =27 w c l = 15pf, (figures 8,9) 18 30 ns t pds |t plh - t phl | propagation delay skew (note2) r l =27 w c l = 15pf, (figures 8,9) 2 5 ns t pzl output enable time r l =110 w (figures 10,11) 19 35 ns t pzh output enable time r l =110 w (figures 6,7) 30 50 ns t phz output disable time r l =110 w (figures 6,7) 19 35 ns t plz output disable time r l =110 w (figures 10,11) 30 50 ns 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 symbol parameter test conditions min. typ. max. unit t plh t phl propagation delay v id =0v to 3v c l1 = 15pf, (figures 12,13) 30 50 ns t rpds |t plh - t phl | propagation delay skew v id =0v to 3v c l1 = 15pf, (figures 12,13) 1 3 ns t pzl output enable time c rl = 15pf (figures 14-18) 10 20 ns t pzh output enable time c rl = 15pf (figures 14-18) 10 20 ns t phz output disable time c rl = 15pf (figures 14-18) 10 20 ns t plz output disable time c rl = 15pf (figures 14-18) 10 20 ns t zh(shdn) receiver enable from shutdown to output high c rl = 15pf (figures 14-18) 10 20 ns t zl(shdn) receiver enable from shutdown to output low c rl = 15pf (figures 14-18) 20 40 ns
st3485e 6/17 test circuits and typical characteristics figure 1 : driver and v oc test load figure 2 : driver v od with varying common mode voltage test load figure 3 : receiver v oh and v ol test circuit
st3485e 7/17 figure 4 : drive differential output delay transition time test circuit figure 5 : drive differential output delay transition time waveform figure 6 : drive enable and disable times test circuit
st3485e 8/17 figure 7 : drive enable and disable times waveforms figure 8 : drive propagation time test circuit figure 9 : drive propagation time waveform
st3485e 9/17 figure 10 : drive enable and disable times test circuit figure 11 : drive enable and disable times waveforms figure 12 : receiver propagation delay time test circuit
st3485e 10/17 figure 13 : receiver propagation delay time waveforms figure 14 : receiver enable and disable times test circuit figure 15 : receiver enable and disable times waveform
st3485e 11/17 figure 16 : receiver enable and disable times waveform figure 17 : receiver enable and disable times waveform figure 18 : receiver enable and disable times waveform
st3485e 12/17 figure 19 : receiver output current vs output low voltage figure 20 : receiver output current vs output high voltage figure 21 : low level driver output capability figure 22 : high level driver output capability figure 23 : receiver input characteristics figure 24 : driver short circuit current
st3485e 13/17 figure 25 : driver short circuit current
st3485e 14/17 dim. mm. inch min. typ max. min. typ. max. a 3.3 0.130 a1 0.7 0.028 b 1.39 1.65 0.055 0.065 b1 0.91 1.04 0.036 0.041 b 0.5 0.020 b1 0.38 0.5 0.015 0.020 d 9.8 0.386 e 8.8 0.346 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 f 7.1 0.280 i 4.8 0.189 l 3.3 0.130 z 0.44 1.6 0.017 0.063 plastic dip-8 mechanical data p001f
st3485e 15/17 dim. mm. inch min. typ max. min. typ. max. a 1.35 1.75 0.053 0.069 a1 0.10 0.25 0.04 0.010 a2 1.10 1.65 0.043 0.065 b 0.33 0.51 0.013 0.020 c 0.19 0.25 0.007 0.010 d 4.80 5.00 0.189 0.197 e 3.80 4.00 0.150 0.157 e 1.27 0.050 h 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 k ? (max.) ddd 0.1 0.04 so-8 mechanical data 0016023/c 8
st3485e 16/17 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.2 0.504 0.519 d 20.2 0.795 n 60 2.362 t 22.4 0.882 ao 8.1 8.5 0.319 0.335 bo 5.5 5.9 0.216 0.232 ko 2.1 2.3 0.082 0.090 po 3.9 4.1 0.153 0.161 p 7.9 8.1 0.311 0.319 tape & reel so-8 mechanical data
st3485e 17/17 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result f rom its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specificati ons mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics all other names are the property of their respective owners ? 2003 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. http://www.st.com

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