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1 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation description features applications sp3080e-3088e advanced-failsafe rs-485/rs-422 transceivers 1/8th unit load, slew-rate limited, 15kv esd-protected ? 5.0v single supply operation ? receiver failsafe on open, shorted or terminated lines ? 1/8th unit load, 256 transceivers on bus ? robust esd protection for rs-485 pins o 15kv air-gap discharge o 15kv human body model o 8kv contact discharge ? controlled driver slew rates o 115kbps, low emi (sp3080e, sp3081e, sp3082e) o 500kbps, low emi (sp3083e, sp3084e, SP3085E) o high speed, 20mbps (sp3086e, sp3087e, sp3088e) ?hot swap glitch protection on control inputs ?driver short circuit current limit and thermal shutdown for overload protection ?ultra-low 400a quiescent current ?1a shutdown mode (except sp3081, sp3084, sp3087) ?industry standard package footprints ? motor control ? building automation ? security systems ? remote meter reading ? long or un-terminated transmission lines the sp3080e-sp3088e family of rs-485 devices are designed for reliable, bidirectional commu - nication on multipoint bus transmission lines. each device contains one differential driver and one differential receiver. sp3082e, SP3085E and sp3088e are half-duplex devices; other part num - bers are full-duplex. all devices comply with tia/eia-485 and tia/eia-422 standards. lead-free and rohs compliant packages are available for all models. these devices are ruggedized for use in harsh operating conditions over the entire common-mode voltage range from -7v to +12v. receivers are specially designed to fail-safe to a logic high output state if the inputs are left un-driven or shorted. all rs-485 bus-pins are protected against severe esd events up to 15kv (air-gap and human body model) and up to 8kv contact discharge (iec 1000- 4-2). drivers are protected from excess current ?ow caused by bus contention or output short-circuits by both an internal current limit and a thermal-overload shutdown. devices are rated for industrial (-40 to +85oc) operating temperatures. receivers have exceptionally high input impedance, which places only 1/8th the standard load on a shared bus. up to 256 transceivers may coexist while pre - serving full signal margin. all devices operate from a single 5.0v power supply and draw negligible quiescent power. all ver - sions except the sp3081e, sp3084e, and sp3087e may independently enable and disable their driver and receiver and enter a low power shutdown mode if both driver and receiver are disabled. all outputs maintain high impedance in shutdown or when powered-of f. 8 pin nsoic sp3082e SP3085E sp3088e half duplex 8 pin nsoic sp3081e sp3084e sp3087e full duplex 1 2 3 4 5 6 7 8 5 6 7 8 1 2 3 4 14 pin nsoic sp3080e sp3083e sp3086e full duplex 1 2 3 4 5 6 7 8 9 10 11 12 13 14 nc ro re de di gnd gnd vc c nc a b z y nc vc c ro di gnd a b z y gnd a b vc c ro re de di
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 2 device architecture and block diagrams devices are available in three industry standard architectures and footprints. in each footprint there are three speed grades available. d r a b z y ro gnd 2 1 3 4 5 6 7 8 di v cc d r a b ro gnd 2 1 3 4 5 6 7 8 de v cc re di v cc d r nc a b z y ro nc nc de re gnd gnd 2 1 3 4 5 6 7 8 9 10 11 12 13 14 di 14-pin full duplex sp3080e, 115kbps slew rate limited sp3083e, 500kbps slew rate limited sp3086e, 20mbps 8-pin full duplex sp3081e, 115kbps slew rate limited sp3084e, 500kbps slew rate limited sp3087e, 20mbps 8-pin half duplex sp3082e, 115kbps slew rate limited SP3085E, 500kbps slew rate limited sp3088e, 20mbps
3 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation pin assignments pin number pin name pin function full-duplex half - duplex sp3080e sp3081e sp3082e sp3083e sp3084e SP3085E sp3086e sp3087e sp3088e 2 2 1 ro receiver output when re is low and if (a b) -40mv, ro is high if (a b) - 200mv, ro is low 3 - 2 r e reree re re r re r re e re e e e e e re e e r r r r
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 4 absolute maximum ratings recommended operating conditions these are stress ratings only and functional opera - tion of the device at these ratings or any other above those indicated in the operation sections of the speci - ?cations below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. supply voltage (v cc )...............................................+ 7.0v input voltage at control input pins ( re , de) ..... -0.3v to v cc +0.3v driver input voltage (di) .....................-0.3v to v cc +0.3v driver output voltage (a, b, y, and z) ...................+/-13v receiver output voltage ( ro ) ........-0.3v to (vcc + 0.3v) receiver input voltage (a, b) ................................+/-13v package power dissipation: maximum junction temperature 150c 8-pin so ? ja = 128.4c/w 14-pin so ? ja = 86c/w storage temperature.............................-65c to +150c lead temperature (soldering, 10s)..................... +300c recommended operating conditions min. nom. max. unit supply voltage, v cc 4.5 5 5.5 v input voltage on a and b pins -7 12 v high-level input voltage (di, de or re ), v ih 2 v cc v low-level input voltage (di, de or re ), v ih 0 0.8 v output current driver -60 60 ma receiver -8 8 signaling rate, 1/t ui sp3080, sp3081, sp3082 0.115 mbps sp3083, sp3084, sp3085 0.5 sp3086, sp3087, sp3088 20 operating free air temperature, t a industrial grade (e) -40 85 c note: the least positive (most negative) limit is designated as the maxium value. vcc=5v 5%, t min to t max , unless otherwise noted, typical values are vcc=5v and t a =25 c
5 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation electrical characteristics parameter test conditions min typ max unit digital input signals: di, de, re logic input thresholds high, v ih 2.0 v low, v il 0.8 logic input current t a = 25c, after ?rst transition 1 a input hysteresis t a = 25c 100 mv driver differential driver output (v od ) no load v cc v differential driver output, test 1 r l =100? (rs-422) 2 v cc v r l =54? (rs-485) 1.5 2.7 v cc differential driver output, test 2 v cm = -7 to +12v 1.5 v cc change in magnitude of differential output voltage (?v od ) (note 1) r l =54 or 100? 0.2 v driver common mode output voltage (vcc) r l =54 or 100? 1 3 v change in common mode output voltage (?v oc ) r l =54 or 100? 0.2 v driver short circuit current limit -7v v out +12v 250 ma output leakage current (full-duplex versions, y & z pins) note 2 de=0, v out =12v 125 a re =0, v cc =0 or 5.5v v out = -7v -100 receiver receiver input resistance -7v v cm 12v 96 k? input current (a, b pins) de=0, re =0, vcc=0 or 5.5v v in = 12v 125 v in = -7v -100 a receiver differential threshold (va-vb) -7v v cm 12v -200 -125 -40 mv receiver input hysteresis 25 mv receiver output voltage v oh i out = -8ma, v id = -40mv vcc-1.5 v v ol i out = 8ma, v id = -200mv 0.4 high-z receiver output current v cc =5.5v, 0 v out v cc 1 a receiver output short circuit current 0v v ro v cc 95 ma supply and protection supply current iq, active mode no load, di=0 or v cc 400 900 a shutdown mode de=0, re =vcc, di=v cc 1 a thermal shutdown temperature junction temperature 165 o c thermal shutdown hysteresis 15 notes: 1. change in magnitude of differential output voltage and change in magnitude of common mode output voltage are the changes in output voltage when di input changes state. 2. except devices which dont have de or re inputs. 3. the transceivers are put into shutdown by bringing re high and de low. if the inputs are in this state for less than 50ns the device does not enter shutdown. if the enable inputs are held in this state for at least 600ns the device is assured to be in shutdown. in this low power mode most circuitry is disabled and supply current is typically 1na. 4.characterized, not 100% tested.
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 6 timing characteristics sp3080e, sp3081e, sp3082e conditions min. typ. max. unit driver characteristics: data signaling rate (1 / t ui ) duty cycle 40 to 60% 115 kbps driver propagation delay (t phl , t plh ) r l = 54?, c l = 50pf, 500 2600 ns driver output rise/fall time (t r , t f ) 667 1200 2500 ns driver differential skew (t plh C t phl ) 200 ns driver enable to output high (t dzh ) sp3080e, sp3081e 3500 ns driver enable to output low (t dzl ) 3500 ns driver disable from output high (t dhz ) 100 ns driver disable from output low (t dlz ) 100 ns shutdown to driver output valid (t dzv ) 6000 ns sp3083e, sp3084e, SP3085E conditions min. typ. max. unit driver characteristics: data signaling rate (1/ t ui ) duty cycle 40 to 60% 500 kbps driver propagation delay (t phl , t plh ) r l = 54?, c l = 50pf, 250 1000 ns driver output rise/fall time (t r , t f ) 200 530 750 ns driver differential skew (t plh C t phl ) 100 ns driver enable to output high (t dzh ) sp3083e, sp3084e 2500 ns driver enable to output low (t dzl ) 2500 ns driver disable from output high (t dhz ) 100 ns driver disable from output low (t dlz ) 100 ns shutdown to driver output valid (t dzv ) 4500 ns sp3086e, sp3087e, sp3088e conditions min. typ. max. unit driver characteristics: data signaling rate (1 / t ui ) duty cycle 40 to 60% 20 mbps driver propagation delay (t phl , t plh ) r l = 54?, c l = 50pf, 12 20 ns driver output rise/fall time (t r , t f ) 6 10 ns driver differential skew (t plh C t phl ) 5 ns driver enable to output high (t dzh ) sp3086e, sp3087e 150 ns driver enable to output low (t dzl ) 150 ns driver disable from output high (t dhz ) 50 ns driver disable from output low (t dlz ) 50 ns shutdown to driver output valid (t dzzv ) 250 ns receiver characteristics: conditions min. typ. max. unit receiver prop. delay sp3080e - SP3085E c l = 15pf, v id = 2v, 75 200 ns receiver prop. delay sp3086e - sp3088e 75 ns prop. delay skew sp3080e-SP3085E 30 ns prop. delay skew sp3086e-sp3088e 5 ns receiver output rise/fall time c l = 15pf 15 ns receiver enable to output high (t zh ) 50 ns receiver enable to output low (t zl ) 50 ns receiver disable from high (t hz ) 50 ns receiver disable from low (t lz ) 50 ns shutdown to receiver output valid (t rov ) 3500 ns time to shutdown ( (note 2,3,4) 50 200 600 ns unless otherwise noted vcc= +5.00.5v, ambient temperature ta from -40 to +85oc
7 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation typical performance characteristics timing characteristics no-load supply current vs temperature 200 225 250 275 300 325 350 -60 -40 -20 0 20 40 60 80 100 temperature (oc) no-load supply current (ua) de = vcc de = gnd no-load supply current (a) shutdown current vs temperature 500 550 600 650 700 -60 -40 -20 0 20 40 60 80 100 temperature (oc) shutdown current (na) shutdown current (a) supply current vs signaling rate (sp3080-sp3082) 0.1 1 10 100 1000 1 10 100 1000 signaling rate (kbps) supply current (ma) driver and receiver receiver only no load v cc =5v t a =25oc 50% square wave input supply current (ma) supply current vs signaling rate (sp3083-sp3085) 0.1 1 10 100 1000 1 10 100 1000 signaling rate (kbps) supply current (ma) receiver only driver and receiver no load v cc =5v t a =25oc 50% square wave input supply current (ma) supply current vs signaling rate (sp3086-sp3088) 0.1 1 10 100 1 10 100 1000 10000 100000 signaling rate (kbps) supply current (ma) receiver only driver and receiver no load v cc =5v t a =25oc 50% square wave input supply current (ma) output current vs driver output low voltage 0 10 20 30 40 50 60 70 80 90 100 0 1 2 3 4 5 6 output low voltage (v) output current (ma) output current (ma)
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 8 typical performance characteristics driver differential output voltage vs temperature 2 2.2 2.4 2.6 2.8 3 3.2 3.4 -60 -40 -20 0 20 40 60 80 100 temperature (oc) output voltage (v) r l r l output voltage (v) r l =100 ? r l =54 ? output current vs driver output high voltage -120 -100 -80 -60 -40 -20 0 -2 -1 0 1 2 3 4 5 6 output high voltage (v) output current (ma) output current (ma) receiver output voltage vs differential input voltage receiver output low voltage vs temperature 0.1 0.15 0.2 0.25 0.3 0.35 -60 -40 -20 0 20 40 60 80 100 temperature (oc) output low voltage (v) i out =8ma, v id =-200mv output-low voltage (v) receiver output high voltage vs temperature 3.5 3.6 3.7 3.8 3.9 4 -60 -40 -20 0 20 40 60 80 100 temperature (oc) output high voltage (v) i out =8ma, v id =-40mv output-low voltage (v) driver output current vs differential output voltage 0.01 0.1 1 10 100 0 1 2 3 4 5 6 differential output voltage (v) output current (ma) output current (ma) 0 1 2 3 4 5 -200 -180 -160 -140 -120 -100 -80 -60 -40 differential input voltage (mv) receiver output voltage (v) v cc =5v t a =25oc receiver output voltage (v)
9 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation typical performance characteristics driver proagation delay vs temerature (sp3080-sp3082) 870 880 890 900 910 920 930 940 950 960 -60 -40 -20 0 20 40 60 80 100 temperature (oc) propagation delay (ns) t plh t phl r l l =50pf propagation delay (ns) r l =54?, c l =50pf output current vs receiver low voltage 0 10 20 30 40 50 60 0 1 2 3 4 5 output low voltage (v) output current (ma) output current (ma) output current vs receiver output high voltage 0 5 10 15 20 25 30 35 0 1 2 3 4 5 output high voltage (v) output current (ma) output current (ma) driver average propagation delay vs temperature (sp3080-sp3082) 870 880 890 900 910 920 930 940 950 960 -60 -40 -20 0 20 40 60 80 100 temperature (oc) propagation delay (ns) r l l =50pf propagation delay (ns) r l =54?, c l =50pf driver average propagation delay vs temperature (sp3083-sp3085) 410 415 420 425 430 435 -60 -40 -20 0 20 40 60 80 100 temperature (oc) propagation delay (ns) r l l =50pf propagation delay (ns) r l =54 ?, c l =50 pf
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 10 typical performance characteristics propagation delay (ns) driver average propagation delay vs temperature (sp3086-sp3088) 10 10.5 11 11.5 12 12.5 13 13.5 -60 -40 -20 0 20 40 60 80 100 temperature (oc) propagation delay (ns) r l l =50pf r l =54 ?, c l =50 pf driver propagation delay vs temperature (sp3086-sp3088) 8 9 10 11 12 13 14 15 -60 -40 -20 0 20 40 60 80 100 temperature (oc) propagation delay (ns) t plh t phl r l l =50pf propagation delay (ns) r l =54 ?, c l =50 pf receiver propagation delay vs temperature (sp3083-sp3085) 115 120 125 130 135 140 145 150 155 -60 -40 -20 0 20 40 60 80 100 temperature (oc) propagation delay (ns) t plh t phl c l =15pf, v id =2v propagation delay (ns) propagation delay (ns) r l =54 ?, c l =50 pf driver propagation delay vs temperature (sp3083-sp3085) 390 400 410 420 430 440 450 460 -60 -40 -20 0 20 40 60 80 100 temperature (oc) propagation delay (ns) t plh t phl r l l =50pf 70 80 90 100 110 120 -60 -40 -20 0 20 40 60 80 100 temperature (oc) propagation delay (ns) c l =15pf, v id =2v receiver average propagation delay vs temperature (sp3080-sp3082) propagation delay (ns) propagation delay (ns) receiver propagation delay vs temperature (sp3080-sp3082) 70 80 90 100 110 120 -60 -40 -20 0 20 40 60 80 100 temperature (oc) propagation delay (ns) t plh t phl c l =15pf, v id =2v propagation delay (ns) propagation delay (ns) propagation delay (ns) r l =54 ?, c l =50 pf r l =54 ?, c l =50 pf
11 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation typical performance characteristics receiver average propagation delay vs temperature (sp3086-sp3088) 40 42 44 46 48 50 52 54 -60 -40 -20 0 20 40 60 80 100 temperature (oc) propagation delay (ns) c l =15pf, v id =2v propagation delay (ns) receiver propagation delay vs temperature (sp3086-sp3088) 35 37 39 41 43 45 47 49 51 53 55 -60 -40 -20 0 20 40 60 80 100 temperature (oc) propagation delay (ns) t plh t phl c l =15pf, v id =2v propagation delay (ns) driver and receiver hot swap performance vs. vcc driver propagation delay (sp3080-sp3082) driver output waveform low to high (sp3080-sp3082) driver output waveform high to low (sp3080-sp3082)
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 12 typical performance characteristics driver and receiver waveform low to high (sp3080-sp3082) driver and receiver waveform high to low (sp3080-sp3082) driver and receiver waveform low to high (sp3083-sp3085) driver propagation delay (sp3083-sp3085) driver output waveform high to low (sp3083-sp3085) driver output waveform low to high (sp3083-sp3085)
13 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation typical performance characteristics driver and receiver waveform high to low (sp3083-sp3085) driver propagation delay (sp3086-sp3088) driver output waveform low to high (sp3086-sp3088) driver output waveforms high to low (sp3086-sp3088) driver and receiver waveform low to high (sp3086-sp3088) driver and receiver waveform high to low (sp3086-sp3088)
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 14 typical performance characteristics receiver propagation delay (sp3086-sp3088) receiver propagation delay (sp3080-sp3082) receiver propagation delay (sp3083-sp3085)
15 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation description driver dc test circuit receiver dc test circuit driver propagation delay time test circuit and timing diagram
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 16 description v od 60 375 375 v cm d di= 0 or v cc de= 3v a/y b/z di d y z s1 0 or v cc generator 50? c l =50pf ou t r l = 500? de ou t v cc /2 v cc 0 0.25v 0 t lz t zl , t zl(shdn) v om = (v ol + v cc )/2 driver differential output test circuit driver enable and disable times test circuit and timing diagram
17 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 0 or v cc di d generator y z 50? c l =50pf s1 v cc out r l =500? 0 v cc v cc /2 t lz t zl , t zl (shdn) 0.25v v om = (v ol + v cc )/2 v ol v cc out de v id re a b r out cl 15pf a b out t phl 1.5v t plh +1v -1v v oh v ol description driver enable and disable times test circuit and timing diagram receiver propagation delay test circuit and timing diagram
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 18 description 1.5v -1.5v generator s3 b a re 50? 1k? c l =15pf s1 s2 v cc re 3v 1.5v t zh , t zh(shdn) out v oh v oh /2 0v s1 is open, s2 is closed, s3=1.5v s1 is closed, s2 is open, s3= -1.5v re out v ol = v cc /2 v ol v cc 0v 1.5v 3v t zl , t zl(shdn) s1 is open, s2 is closed, s3=1.5v re 0.25v out 1.5v 3v v oh 0v s1 is closed, s2 is open, s3= -1.5v re out 3v 1.5v t lz 0v v cc v ol 0.25v receiver enable and disable times test circuit receiver enable and disabletiming diagram
19 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation function tables receiving inputs output r e de v a - v b ro 0 x -40mv 1 0 x -200mv 0 0 x open/shorted 1 1 1 x high-z 1 0 x shutdown transmitting inputs outputs r e de di y z x 1 1 1 0 x 1 0 0 1 0 0 x high-z 1 0 x shutdown sp3080e, sp3083e, sp3086e (full duplex) sp3081e sp3084e, sp3087e (full duplex) transmitting input outputs di y z 1 1 0 0 0 1 open 1 0 receiving inputs output v a - v b ro -40mv 1 -200mv 0 open/shorted 1 sp3082e SP3085E, sp3088e (half duplex) transmitting inputs outputs r e de di a b x 1 1 1 0 x 1 0 0 1 0 0 x high-z 1 0 x shutdown receiving inputs output r e de v a - v b ro 0 x -40mv 1 0 x -200mv 0 0 x open/shorted 1 1 1 x high-z 1 0 x shutdown note: receiver inputs -200mv < va - vb < -40mv, should be considered indeterminate product selector guide part number duplex data rate (mbps) shut-down receiver & driver enable trans on bus foot-print pin-compatible upgrade from: sp3080e full 0.115 yes yes 256 sn75180 max3080 sp3081e full 0.115 no no 256 sn75179 max3081 sp3082e half 0.115 yes yes 256 sn75176 sp483, max3082 sp3083e full 0.5 yes yes 256 sn75180 max3083 sp3084e full 0.5 no no 256 sn75179 max3084 SP3085E half 0.5 yes yes 256 sn75176 max3085 sp3086e full 20 yes yes 256 sn75180 sp1491, max3086 sp3087e full 20 no no 256 sn75179 sp1490, max3087 sp3088e half 20 yes yes 256 sn75176 sp1481, max3088
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 20 description detailed description sp3080e-sp3088e is a family of advanced rs-485/rs-422 transceivers. each contains one driver and one receiver. these devices feature fail-safe circuitry that guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled. sp3080e, sp3082e, sp3083e, SP3085E, sp3086e and sp3088e also feature a hot-swap capability allowing live insertion without error data transfer. the sp3080e, sp3081e and sp3082e fea - ture reduced slew-rate drivers that minimize emi and reduce re?ections caused by improp - erly terminated cables, allowing error-free data transmission up to 115kbps. the sp3083e, sp3084e and SP3085E also offer slew-rate limits allowing transmit speeds up to 500kbps. the sp3086e, sp3087e, sp3088e driver slew rates are not limited, making transmit speeds up to 20mbps possible. the sp3082e, SP3085E and sp3088e are half-duplex transceivers, while the sp3080e, sp3081e, sp3083e, sp3084e, sp3086e, and sp3087e are full duplex transceivers. all devices operate from a single 5.0v supply. drivers are output short-circuit current limited. thermal-shutdown circuitry protects drivers against excessive power dissipation. when ac - tivated, the thermal-shutdown circuitry places the driver outputs into a high-impedance state. receiver input filtering sp3080e-SP3085E receivers incorporate input ?ltering in addition to input hysteresis. this ?l - tering enhances noise immunity with differential signals that have very slow rise and fall times. receiver propagation delay increases due to this ?ltering. advanced fail safe ordinary rs485 differential receivers will be in an indeterminate state whenever a - b is less than 200mv. this situation can occur when - ever the data bus is not being actively driven. the advanced failsafe feature of the sp3080e family guarantees a logic-high receiver output if the receivers differential inputs are shorted, open-circuit, or if they are shunted by a termi - nation resistor. the receiver thresholds of the sp3080e family, are very precise and offset by at least a 40mv noise margin from ground. this results in a logic-high receiver output at zero volts input dif - ferential while maintaining compliance with the eia/tia-485 standard of 200mv. hot-swap capability when a micro-processor or other logic device undergoes its power-up sequence its logic- outputs are typically at high impedance. in this state they are unable to drive the de and sig - nals to a de?ned logic level. during this period, noise, parasitic coupling or leakage from other devices could cause standard cmos enable in - puts to drift to an incorrect logic level. if circuit boards are inserted into an energized backplane (commonly called live insertion or hot-swap) power may be suddenly applied to all circuits. without the hot-swap capability, this situation could improperly enable the transceiv - ers driver or receiver, driving invalid data onto shared busses and possibly causing driver con - tention or device damage. the sp3080e family contains a special power- on-reset circuit that holds de low and re high for approximately 10 microseconds. after this initial power-up sequence the hot-swap circuit becomes transparent, allowing for normal, un- skewed enable and disable timings. 15kv esd protection esd-protection structures are incorporated on all pins to protect against electrostatic dis - charges encountered during handling and as - sembly. the driver output and receiver inputs of the sp3080e family have extra protection against static electricity. sipex uses state of the art structures to protect these pins against esd of 15kv without damage. the esd struc - tures withstand high esd in all states: normal operation, shutdown, and powered down. after an esd event, the sp3080e - sp3088e keeps working without latch-up or damage. esd protection can be tested in various ways. the transmitter outputs and receiver inputs of
21 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation description the sp3080e - sp3088e are characterized for protection to the following limits: 15kv using the human body model 8kv using the contact discharge method speci?ed in iec 1000-4-2 15kv air-gap esd test conditions esd performance depends on a variety of con - ditions. contact sipex for a reliability report that documents test setup, methodology and results. iec 1000-4-2 the iec 1000-4-2 standard covers esd testing and performance of ?nished equipment. how - ever, it does not speci?cally refer to integrated circuits. the sp3080e family helps you design equipment to meet iec 1000-4-2, without sac - ri?cing board space and cost for external esd- protection components. the major difference between tests done us - ing the human body model and iec 1000-4-2 is a higher peak current in iec 1000-4-2 series resistance is lower in the iec 1000-4-2 model. hence, the esd withstand voltage measured to iec 1000-4-2 is generally lower than that mea - sured using the human body model. the air-gap test involves approaching the de - vice with a charged probe. the contact dis - charge method connects the probe to the de - vice before the probe is energized. machine model the machine model for esd tests all pins using a 200pf storage capacitor and zero discharge resistance. the objective is to emulate the stress caused when i/o pins are contacted by handling equipment during test and assembly. 256 transceivers on the bus the standard rs-485 receiver input impedance is 12k? (1 unit load). a standard driver can drive up to 32 unit loads. the sp3080e fam - ily of transceivers has only a 1/8th unit load re - ceiver input impedance (96k?), thereby allow - ing eight times as many, up to 256, transceivers to be connected in parallel on a communication line. any combination of these devices and oth - er rs-485 transceivers up to a total of 32 unit loads may be connected to the line. low power shutdown mode low-power shutdown mode is initiated by bring - ing both re high and de low simultaneously. while in shutdown devices typically draw only 50na of supply current. de and re may be tied together and driven by a single control signal. devices are guaranteed not to enter shutdown if re is high and de is low for less than 50ns. if the inputs are in this state for at least 600ns, the parts are shutdown. enable times t zh and t zl apply when the part is not in low-power shutdown state. enable times t zh ( shdn ) and t zl ( shdn ) apply when the parts are shut down. the drivers and receivers take longer to become enabled from low power shut - down mode t zl ( shdn ) and t zl ( shdn ) than from driver/receiver-disable mode (t zh , t zl ). driver output protection two mechanisms prevent excessive output cur - rent and power dissipation caused by faults or by bus contention. first, a driver-current limit on the output stage provides immediate protec - tion against short circuits over the whole com - mon-mode voltage range. second, a thermal- shutdown circuit forces the driver outputs into a high-impedance state if junction temperature becomes excessive. line length, emi, and reflections sp3080e - SP3085E feature controlled slew- rate drivers that minimize emi and reduce re?ec - tions caused by improperly terminated cables. sp3080e - sp3083e driver rise and fall times are limited to no faster than 667ns, allowing er - ror-free data transmission up to 115kbps. the sp3083, sp3084 and sp3085 offer somewhat higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. the rs-485/rs-422 standard covers line lengths up to 4,000ft. maximum achievable line length is a function of signal attenuation and noise. use of slew-controlled drivers such as the sp3080e-sp3086e may help to reduce crosstalk interference and permit communica - tion over longer transmission lines.
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 22 description termination prevents re?ections by eliminating the impedance mismatches on a transmission line. line termination is typically used if rise and fall times are shorter than the round-trip signal propagation time. slew-limited drivers may reduce or eliminate the need for cable ter - mination in many applications. h a l f - d u p l e x n e t w o r k b i - d i r e c t i o n a l f u l l - d u p l e x n e t w o r k r e p e a t e r ( o p t i o n a l ) r e p e a t e r ( o p t i o n a l ) po i n t to multi - poi n t with repeater typical applications: half-duplex network bi-directional full-duplex network point to multi-point repeater repeater (optional)
23 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation
rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation 24
25 rev m 2/22/2007 sp3080e-3088e advanced rs485 transceivers ? copyright 2007 sipex corporation solved by sipex tm sipex corporation headquarters and sales of?ce 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability arising out of the applica - tion or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. ordering information part number lead free tape & reel temperature range package type sp3080een -l /tr from -40 to +85 0 c 14 pin nsoic sp3081een -l /tr from -40 to +85 0 c 8 pin nsoic sp3082een -l /tr from -40 to +85 0 c 8 pin nsoic sp3083een -l /tr from -40 to +85 0 c 14 pin nsoic sp3084een -l /tr from -40 to +85 0 c 8 pin nsoic SP3085Een -l /tr from -40 to +85 0 c 8 pin nsoic sp3086een -l /tr from -40 to +85 0 c 14 pin nsoic sp3087een -l /tr from -40 to +85 0 c 8 pin nsoic sp3088een -l /tr from -40 to +85 0 c 8 pin nsoic all packages are available as lead free (rohs compliant). to order add -l suf?x to part number. for tape and reel add /tr. reel quantity is 2,500 for nsoic. example: sp3082een-l/tr = lead free and tape and reel. sp3082een/tr = standard with tape and reel.

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