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1/12 november 2002 n low quiescent current: 300 m a n designed for rs-485 interface applications n -7v to 12v common mode input voltage range n driver maintains high impedance in 3-stateorwiththepoweroff n 70mv typical input hysteresis n 30ns propagation delays, 5ns skew n operate from a single 5v supply n current limiting and thermal shutdown for driver overload protection n allows up to 64 transceivers on the bus description the st485 is al low power transceiver for rs-485 and rs-422 communication. each part contains one driver and one receiver. this transceiver draw 300 m a (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 placed the driver outputs into a high-impedance state. . the st485 is designed for bi-directional data communications on multipoint bus transmission line (half-duplex applciations). the st485 is available in three temperature range: commercial (0c to 70c), industrial (-40c to 850c) and automotive (-55c to 125c) ordering codes ty pe temperature range package comments st485cn 0 to 70 c dip-8 50parts per tube / 40tube per box st485bn -40 to 85 c dip-8 50parts per tube / 40tube per box st485xn -55 to 125 c dip-8 50parts per tube / 40tube per box st485cd 0 to 70 c so-8 (tube) 100parts per tube / 20tube per box st485bd -40 to 85 c so-8 (tube) 100parts per tube / 20tube per box ST485XD -55 to 125 c so-8 (tube) 100parts per tube / 20tube per box st485cdr 0 to 70 c so-8 (tape & reel) 2500 parts per reel st485bdr -40 to 85 c so-8 (tape & reel) 2500 parts per reel ST485XDr -55 to 125 c so-8 (tape & reel) 2500 parts per reel st485 low power rs-485/rs-422 transceiver dip sop
st485 2/12 pin configuration pin description truth table (driver) x= dont care; z=high impedance truth table (receiver) x= dont care; z=high impedance 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. pln n symbol name and function 1 ro receiver output 2re receiver output enable 3 de driver output enable 4 di driver input 5 gnd ground 6 a non-inverting receiver input and non-inverting driver output 7 b inverting receiver input and inverting driver output 8 v cc supply voltage inputs outputs re de di b a xhhlh xhlhl xlxzz inputs output re de a-b ro ll 3 +0.2v h ll -0.2v l l l inputs open h hl x z symbol parameter value unit v cc supply voltage 12 v v i control input voltage (re , de) -0.5 to (v cc + 0.5) v v di driver input voltage (di) -0.5 to (v cc + 0.5) 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) -0.5 to (v cc + 0.5) v
st485 3/12 dc electrical characteristics (v cc =5v 5%, t a =t min to t max , unless otherwise specified. typical values are referred to t a = 25c) (see note 1) note 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. note 2: supply current specification is valid for loaded transmitters when v de =0v note 3: applies to peak current. see typical operating characteristics. symbol parameter test conditions value unit -40 to 85 c -55 to 125 c min. typ. max. min. max. v od1 differential driver output (no load) 55v v od2 differential driver output (with load) r l =27 w (rs-485) (see fig.1) r l =50 w (rs-422) (see fig.1) 1.5 5 5 1.4 5 5 v v d v od change in magnitude of driver differential output voltage for complementary output states r l =27 w or 50 w (see fig. 1) 0.2 0.2 v v oc driver common-mode output voltage r l =27 w or 50 w (see fig. 1) 3 3 v d v oc change in magnitude of driver common-mode output voltage for complementary output states r l =27 w or 50 w (see fig. 1) 0.2 0.2 v v ih input high voltage re , de, di 2.0 2.0 v v il input low voltage re , de, di 0.8 0.8 v i in1 input current re , de, di 2 2 m a i in2 input current (a, b) v cm = 0v or 5.25v v de =0v v in = 12v v in = -7v 1 -0.8 1 -0.8 ma ma v th receiver differential threshold voltage v cm = -7 to 12v -0.2 0.2 -0.2 0.2 v d v th receiver input hysteresis v cm =0v 70 mv v oh receiver output high voltage i o = -4ma v id = 200mv 3.5 3.4 v v ol receiver output low voltage i o =4ma v id = -200mv 0.4 0.55 v i ozr 3-state (high impedance) output current at receiver v o = 0.4 to 2.4v 1 1 m a r in receiver input resistance v cm = -7 to 12v 24 24 k w i cc no load supply current (note 2) v re =0vorv cc v de =v cc v de =0v 400 300 900 500 900 500 m a m a i osd1 driver short-circuit current, v o =high v o = -7 to 12v (note 3) 35 250 35 250 ma i osd2 driver short-circuit current, v o =low v o = -7 to 12v (note 3) 35 250 35 250 ma i osr receiver short-circuit current v o =0vtov cc 7 95795ma
st485 4/12 driver switching characteristics (v cc =5v 5%, t a =t min to t max , unless otherwise specified. typical values are referred to t a =25c) (see note 1) note 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. receiver switching characteristics (v cc =5v 5%, t a =t min to t max , unless otherwise specified. typical values are referred to t a = 25c) (see note 1) note 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. symbol parameter test conditions value unit -40 to 85 c -55 to 125 c min. typ. max. min. max. t plh t phl propagation delay input to output r diff =54 w c l1 =c l2 = 100pf (see fig. 3 and 5) 10 30 60 70 ns t sk output skew to output r diff =54 w c l1 =c l2 = 100pf (see fig. 3 and 5) 510 10ns t tlh t thl rise or fall time r diff =54 w c l1 =c l2 = 100pf (see fig. 3 and 5) 31540345ns t pzh output enable time c l = 100pf s2 = closed (see fig. 4 and 6) 70 90 90 ns t pzl output enable time c l = 100pf s1 = closed (see fig. 4 and 6) 70 90 90 ns t plz output disable time c l = 15pf s1 = closed (see fig. 4 and 6) 70 90 90 ns t phz output disable time c l = 15pf s2 = closed (see fig. 4 and 6) 70 90 90 ns symbol parameter test conditions value unit -40 to 85 c -55 to 125 c min. typ. max. min. max. t plh t phl propagation delay input to output r diff =54 w c l1 =c l2 = 100pf (see fig. 3 and 7) 20 130 210 230 ns t skd differential receiver skew r diff =54 w c l1 =c l2 = 100pf (see fig. 3 and 7) 13 ns t pzh output enable time c rl = 15pf s1 = closed (see fig. 2 and 8) 20 50 56 ns t pzl output enable time c rl = 15pf s2 = closed (see fig. 2 and 8) 20 50 56 ns t plz output disable time c rl = 15pf s1 = closed (see fig. 2 and 8) 20 50 56 ns t phz output disable time c rl = 15pf s2 = closed (see fig. 2 and 8) 20 50 56 ns f max maximum data rate 2.5 2.5 mbps
st485 5/12 test circuits and typical characteristics figure 1 : driver dc test load figure 2 : receiver timing test load figure 3 : drive/receiver timing test circuit figure 4 : driver timing test load
st485 6/12 figure 5 : driver propagation delay figure 6 : driver enable and disable time
st485 7/12 figure 7 : receiver propagation delay figure 8 : receiver enable and disable time
st485 8/12 figure 9 : receiver output current vs output low voltage figure 10 : receiver output current vs output high voltage figure 11 : driver output current vs output low voltage figure 12 : driver output current vs output high voltage figure 13 : supply current vs temperature figure 14 : receiver high level output voltage vs temperature
st485 9/12 figure 15 : receiver low level output voltage vs temperature figure 16 : differential driver output voltage vs temperature
st485 10/12 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
st485 11/12 dim. mm. inch min. typ max. min. typ. max. a 1.75 0.068 a1 0.1 0.25 0.003 0.009 a2 1.65 0.064 a3 0.65 0.85 0.025 0.033 b 0.35 0.48 0.013 0.018 b1 0.19 0.25 0.007 0.010 c 0.25 0.5 0.010 0.019 c1 45? (typ.) d 4.8 5.0 0.189 0.196 e 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 f 3.8 4.0 0.149 0.157 l 0.4 1.27 0.015 0.050 m 0.6 0.023 s ? (max.) so-8 mechanical data 0016023 8
st485 12/12 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no res ponsibility 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 devi ces or systems without express written approval of stmicroelectronics. ? the st logo is a registered trademark of stmicroelectronics ? 2002 stmicroelectronics - printed in italy - all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malt a - morocco singapore - spain - sweden - switzerland - united kingdom - united states. ? http://www.st.com

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