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february 2009 rev 14 1/18 18 st485eb st485ec - st485ex 15 kv esd protected, low power rs-485/rs-422 transceiver features low quiescent current: 300 a designed for rs-485 interface application - 7 v to 12 v common mode input voltage range driver maintains high impedance in 3-state or with the power off 70 mv typical input hysteresis 30 ns propagation delay, 5 ns skew operates from a single 5 v supply current limiting and thermal shutdown for driver overload protection esd protection: ? 15 kv (hbm) ? 8 kv (iec-1000-4-2 contact discharge) allows up to 256 transceivers on the bus description the st485e is a low power transceiver for rs- 485 and rs-422 communication. each driver output and receiver input is protected against 15 kv electrostatic discharge (hbm) (esd) shocks, without latch-up. these parts contain one driver and one receiver in half duplex configuration. this transceiver draws 300 a (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 st485e is designed for bi-directional data communications on multipoint bus transmission lines (half-duplex applications). so-8 table 1. device summary order codes temperature range package packaging st485ebd - 40 to 85 c so-8 (tube) 100 parts per tube / 20 tube per box st485ecdr 0 to 70 c so-8 (tape and reel) 2500 parts per reel ST485EBDR - 40 to 85 c so-8 (tape and reel) 2500 parts per reel st485exdr - 55 to 125 c so-8 (tape and reel) 2500 parts per reel www.st.com
contents st485eb - st485ec - st485ex 2/18 contents 1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
st485eb - st485ec - st485ex pin configuration 3/18 1 pin configuration figure 1. pin connections (top view) table 2. pin description pin 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 8v cc supply voltage
truth tables st485eb - st485ec - st485ex 4/18 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 re de di b a xhhlh xhlhl xlxzz table 4. truth table (receiver) inputs outputs re de a-b ro ll +0.2v h ll -0.2v l l l inputs open h hlx z
st485eb - st485ec - st485ex maximum ratings 5/18 3 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these is not implied. table 5. absolute maximum ratings symbol parameter value unit v cc supply voltage 7 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
electrical characteristics st485eb - st485ec - st485ex 6/18 4 electrical characteristics v cc = 5 v 5 %, t a = t min to t max , unless otherwise specified. typical values are referred to t a = 25 c table 6. 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 8kv table 7. dc electrical characteristics symbol parameter test conditions (1) min. typ. max. unit v od1 differential driver output (no load) 5v v od2 differential driver output (with load) r l = 27 (rs-485) ( figure 2 ) r l = 50 (rs-422) ( figure 2. ) 1.5 5 5 v v v od change in magnitude of driver differential output voltage for complementary output states r l = 27 or 50 ( figure 2 )0.2v v oc driver common-mode output voltage r l = 27 or 50 ( figure 2 )3v v oc change in magnitude of driver common-mode output voltage for complementary output states r l = 27 or 50 ( figure 2 )0.2v v ih input high voltage re , de, di 2.0 v v il input low voltage re , de, di 0.8 v i in1 input current re , de, di 2a i in2 input current (a, b) v cm = 0 v or 5.25 v, v de = 0 v v in = 12 v v in = -7 v 1 -0.8 ma ma v th receiver differential threshold voltage v cm = -7 to 12 v -0.2 0.2 v v th receiver input hysteresis v cm = 0 v 70 mv v oh receiver output high voltage i o = -4 ma, v id = 200 mv 3.5 v v ol receiver output low voltage i o = 4 ma, v id = -200 mv 0.4 v i ozr 3-state (high impedance) output current at receiver v o = 0.4 to 2.4 v 1a r in receiver input resistance v cm = -7 to 12 v 96 k i cc no load supply current (2) v re = 0v or v cc v de = v cc v de = 0 v 400 300 900 500 a a
st485eb - st485ec - st485ex electrical characteristics 7/18 v cc = 5 v 5 %, t a = t min to t max , unless otherwise specified. typical values are referred to t a = 25 c i osd1 driver short-circuit current, v o =high v o = -7 to 12 v (3) 35 250 ma i osd2 driver short-circuit current, v o =low v o = -7 to 12 v (3) 35 250 ma i osr receiver short-circuit current v o = 0 v to v cc 795ma 1. all currents into device pins are positive; all out of device pins are negat ive; all voltages are re ferenced to device ground unless specified. 2. supply current specification is valid for loaded transmitters when v de = 0 v 3. applies to peak current. see ty pical operating characteristics. table 7. dc electrical characteristics (continued) symbol parameter test conditions (1) min. typ. max. unit table 8. driver switching characteristics symbol parameter test conditions (1) min. typ. max. unit t plh t phl propagation delay input to output r diff = 54 , c l1 = c l2 = 100 pf (see figure 4 and figure 6 ) 25 45 ns t sk output skew to output r diff = 54 , c l1 = c l2 = 100 pf (see figure 4 and figure 6 ) 25ns t tlh t thl rise or fall time r diff = 54 , c l1 = c l2 = 100 pf (see figure 4 and figure 6 ) 15 40 ns t pzh output enable time c l = 100 pf, s2 = closed (see figure 5 and figure 7 ) 35 50 ns t pzl output enable time c l = 100 pf, s1 = closed (see figure 5 and figure 7 ) 25 40 ns t plz output disable time c l = 15 pf, s1 = closed (see figure 5 and figure 7 ) 25 40 ns t phz output disable time c l = 15 pf, s2 = closed (see figure 5 and figure 7 ) 35 50 ns 1. all currents into device pins are positive; all out of device pins are negat ive; all voltages are re ferenced to device ground unless specified.
electrical characteristics st485eb - st485ec - st485ex 8/18 v cc = 5 v 5%, t a = t min to t max , unless otherwise specified. typical values are referred to t a = 25 c table 9. receiver switching characteristics symbol parameter test conditions (1) min. typ. max. unit t plh t phl propagation delay input to output r diff = 54 , c l1 = c l2 = 100 pf (see figure 4 and figure 8 ) 110 130 ns t skd differential receiver skew r diff = 54 , c l1 = c l2 = 100 pf (see figure 4 and figure 8 ) 510ns t pzh output enable time c rl = 15 pf, s1 = closed (see figure 2 and figure 9 ) 11 35 ns t pzl output enable time c rl = 15 pf, s2 = closed (see figure 2 and figure 9 ) 13 35 ns t plz output disable time c rl = 15 pf, s1 = closed (see figure 2 and figure 9 ) 13 35 ns t phz output disable time c rl = 15 pf, s2 = closed (see figure 2 and figure 9 ) 11 35 ns f max maximum data rate 5 mbps 1. all currents into device pins are positive; all out of device pins are negat ive; all voltages are re ferenced to device ground unless specified
st485eb - st485ec - st485ex test circuit and typical characteristics 9/18 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
test circuit and typical characteristics st485eb - st485ec - st485ex 10/18 figure 6. driver propagation delay figure 7. driver enable and disable time
st485eb - st485ec - st485ex test circuit and typical characteristics 11/18 figure 8. receiver propagation delay figure 9. receiver enable and disable time
test circuit and typical characteristics st485eb - st485ec - st485ex 12/18 figure 10. receiver output current vs. output low voltage figure 11. receiver output current vs. output high voltage figure 12. driver output current vs. output low voltage figure 13. driver output current vs. output high voltage figure 14. supply current vs. temperature figure 15. receiver high level output voltage vs. temperature
st485eb - st485ec - st485ex test circuit and typical characteristics 13/18 figure 16. receiver low level output voltage vs. temperature figure 17. differential driver output voltage vs. temperature
package mechanical data st485eb - st485ec - st485ex 14/18 6 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com. ecopack is an st trademark.
st485eb - st485ec - st485ex package mechanical data 15/18 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 st485eb - st485ec - st485ex 16/18 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
st485eb - st485ec - st485ex revision history 17/18 7 revision history table 10. document revision history date revision changes 21-mar-2006 9 order codes has been updated and new template. 05-jun-2006 10 change value row 10 on the features and r in in ta b l e 7 . 29-jan-2007 11 typo mistake on page 1. 29-aug-2007 12 change value r in min. on ta b l e 7 . 07-feb-2008 13 modified: table 1 on page 1 . 16-feb-2009 14 modified: note: on page 5 .
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