1 rev. 07/16/02 sp481/483/485 low power half-duplex rs485 transceivers ? copyright 2002 sipex corporation sp481/sp483/sp485 low power half-duplex rs-485 transceivers features +5v only low power bicmos driver/receiver enable slew rate limited driver for low emi (sp483) low power shutdown mode (sp481 and sp483) rs-485 and rs-422 drivers/receivers 8 7 6 5 1 2 3 4 vcc b a gnd d r r o re de di sp481, sp483, and sp485 re the sp481 , sp483 , and the sp485 are a family of half-duplex transceivers that meet the requirements of rs-485 and rs-422. their bicmos design allows low power operation without sacrificing performance. the sp481 and sp485 meet the requirements of rs-485 and rs-422 up to 5mbps. additionally, the sp481 is equipped with a low power shutdown mode. the sp483 is internally slew rate limited to reduce emi and can meet the requirements of rs-485 and rs-422 up to 250kbps. the sp483 is also equipped with a low power shutdown mode. description sp481, sp483, sp485 pinout (top view) ro 1 re 2 de 3 di 4 8 v cc 7 b 6 a 5 gnd d r sp485 top view
2 rev. 07/16/02 sp481/483/485 low power half-duplex rs485 transceivers ? copyright 2002 sipex corporation absolute maximum ratings these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. v cc ........................................................................................................ 12v input voltages logic........................................................-0.3v to (v cc +0.5v) drivers..................................................-0.3v to (v cc +0.5v) receivers................................................................. 15v output voltages logic........................................................-0.3v to (v cc +0.5v) drivers...................................................................... 15v receivers............................................-0.3v to (v cc +0.5v) storage temperature.......................................................-65 ? c to +150 ? c power dissipation...........................................................................500mw electrical characteristics t min to t max and v cc = 5v 5% unless otherwise noted. parameters min. typ. max. units conditions sp481/sp483/sp485 driver dc characteristics differential output voltage gnd v cc volts unloaded; r = ; see figure 1 differential output voltage 2 v cc volts with load; r = 50 ? ; (rs422); see figure 1 differential output voltage 1.5 v cc volts with load; r = 27 ? ; (rs485); see figure 1 change in magnitude of driver differential output voltage for complimentary states 0.2 volts r = 27 ? or r = 50 ? ; see figure 1 driver common-mode output voltage 3 volts r = 27 ? or r = 50 ? ; see figure 1 input high voltage 2.0 volts applies to de, di, re input low voltage 0.8 volts applies to de, di, re input current 10 a applies to de, di, re driver short-circuit current v out = high 35 250 ma -7v v o +12v v out = low 35 250 ma -7v v o +12v sp481/sp485 driver ac characteristics maximum data rate mbps re = 5v, de = 5v driver input to output 30 60 ns t plh ; r diff = 54 ? , c l1 = c l2 = 100pf; see figures 3 and 6 driver input to output 30 60 ns t phl ; r diff = 54 ? , c l1 = c l2 = 100pf; see figures 3 and 6 driver skew 5 10 ns see figures 3 and 6, t skew = | t dplh - t dphl | driver rise or fall time 15 40 ns from 10% to 90%; r diff = 54 ? , c l1 = c l2 = 100pf; see figures 3 and 6 driver enable to output high 40 70 ns c l = 100pf; see figures 4 & 7; s 2 closed driver enable to output low 40 70 ns c l = 100pf; see figures 4 & 7; s 1 closed driver disable time from low 40 70 ns c l = 15pf; see figures 2 & 9; s 1 closed driver disable time from high 40 70 ns c l = 15pf; see figures 2 & 9; s 2 closed sp481/sp483/sp485 receiver dc characteristics differential input threshold +0.2 volts -7v v cm +12v input hysteresis 10 mv v cm = 0v output voltage high volts i o = -4ma, v id = +200mv output voltage low 0.4 volts i o = +4ma, v id = -200mv three-state (high impedance) output current 1 a 0.4v v o 2.4v; re = 5v input resistance 15 k ? -7v v cm +12v input current (a, b); v in = 12v +1.0 ma de = 0v, v cc = 0v or 5.25v, v in = 12v input current (a, b); v in = -7v -0.8 ma de = 0v, v cc = 0v or 5.25v, v in = -7v short-circuit current 95 ma 0v v cm v cc
3 rev. 07/16/02 sp481/483/485 low power half-duplex rs485 transceivers ? copyright 2002 sipex corporation mechanical operating temperature commercial (_c_) 0 +70 c industrial (_e_) -40 +85 c storage temperature -65 +150 c package plastic dip (_s) nsoic (_n) electrical characteristics t min to t max and v cc = 5v 5% unless otherwise noted. parameters min. typ. max. units conditions sp481/sp485 receiver ac characteristics maximum data rate 5 mbps re = 0v, de = 0v receiver input to output 60 90 200 ns t plh ; r diff = 54 ? , c l1 = c l2 = 100pf; figures 3 & 8 receiver input to output 60 90 200 ns t phl ; r diff = 54 ? , c l1 = c l2 = 100pf; figures 3 & 8 diff. receiver skew it plh -t phl i13 ns r diff = 54 ? ; c l1 = c l2 = 100pf; figures 3 & 8 receiver enable to output low 20 50 ns c rl = 15pf; figures 2 & 9; s 1 closed receiver enable to output high 20 50 ns c rl = 15pf; figures 2 & 9; s 2 closed receiver disable from low 20 50 ns c rl = 15pf; figures 2 & 9; s 1 closed receiver disable from high 20 50 ns c rl = 15pf; figures 2 & 9; s 2 closed sp481 shutdown timing time to shutdown 50 200 600 ns re = 5v, de = 0v driver enable from shutdown to output high 40 100 ns c l = 100pf; see figures 4 & 7; s 2 closed driver enable from shutdown to output low 40 100 ns c l = 100pf; see figures 4 & 7; s 1 closed receiver enable from shutdown to output high 300 1000 ns c l = 15pf; see figures 2 & 9; s 2 closed receiver enable from shutdown to output low 300 1000 ns c l = 15pf; see figures 2 & 9; s 1 closed power requirements supply voltage +4.75 +5.25 volts supply current sp481/485 no load 900 a re, di = 0v or v cc ; de = v cc a re = 0v, di = 0v or 5v; de = 0v sp483 no load 600 a re, di = 0v or v cc ; de = v cc a re=0v, di = 0v or 5v; de = 0v sp481/sp483 shutdown mode 10 a de = 0v, re=v cc environmental and
4 rev. 07/16/02 sp481/483/485 low power half-duplex rs485 transceivers ? copyright 2002 sipex corporation pin function pin# name description 1 ro receiver output. 2 re receiver output enable active low. 3 de driver output enable active high. 4 di driver input. 5 gnd ground connection. 6 a driver output/receiver input non-inverting. 7 b driver output/receiver input inverting. 8 vcc positive supply 4.75v 5 rev. 07/16/02 sp481/483/485 low power half-duplex rs485 transceivers ? copyright 2002 sipex corporation receivers sp481, sp483, sp485 the sp481 , sp483 , and sp485 receivers have differential inputs with an input sensitivity as low as 200mv. input impedance of the receiv- ers is typically 15k ? (12k ? minimum). a wide common mode range of -7v to +12v allows for large ground potential differences between systems. the receivers of the sp481 , sp483 and sp485 have a tri-state enable control pin. a logic low on re (pin 4) will enable the receiver, a logic high on re (pin 4) will disable the receiver. the receiver for the sp481 and sp485 will operate up to at least 5mbps. the sp483 receiver is rated for data rates up to 250kbps. the receiver for each of the three devices is equipped with the fail-safe feature. fail-safe guarantees that the receiver output will be in a high state when the input is left unconnected. shutdown mode sp481/sp483 the sp481 and sp483 are equipped with a shutdown mode. to enable the shutdown state, both the driver and receiver must be disabled simultaneously. a logic low on de (pin 5) and a logic high on re (pin 4) will put the sp481 or sp483 into shutdown mode. in shutdown, supply current will drop to typically 1 a. description sp481, sp483, sp485 the sp481 , sp483 , and sp485 are half-duplex differential transceivers that meet the require- ments of rs-485 and rs-422. fabricated with a sipex proprietary bicmos process, all three products require a fraction of the power of older bipolar designs. the rs-485 standard is ideal for multi-drop applications and for long-distance interfaces. rs-485 allows up to 32 drivers and 32 receivers to be connected to a data bus, making it an ideal choice for multi-drop applications. since the cabling can be as long as 4,000 feet, rs-485 transceivers are equipped with a wide (-7v to +12v) common mode range to accommodate ground potential differences. because rs-485 is a differential interface, data is virtually immune to noise in the transmission line. drivers sp481, sp483, sp485 the driver outputs of the sp481 , sp483 , and sp485 are differential outputs meeting the rs- 485 and rs-422 standards. the typical voltage output swing with no load will be 0 volts to +5 volts. with worst case loading of 54 ? across the differential outputs, the drivers can maintain greater than 1.5v voltage levels. the drivers of the sp481 , sp483 and sp485 have an enable control line which is active high. a logic high on de (pin 5) will enable the differential driver outputs. a logic low on de (pin 5) will tri-state the driver outputs. the transmitters of the sp481 and sp485 will operate up to at least 5mbps. the sp483 has internally slew rate limited driver outputs to minimize emi. the maximum data rate for the sp483 driver is 250kbps.
6 rev. 07/16/02 sp481/483/485 low power half-duplex rs485 transceivers ? copyright 2002 sipex corporation figure 6. driver propagation delays a v od v oc b r r figure 1. driver dc test load circuit figure 2. receiver timing test load circuit figure 3. driver/receiver timing test circuit figure 4. driver timing test load #2 circuit c rl 1k s 2 s 1 v cc 1k t est point receiver output b a di b a c l1 c l2 r diff de 3v ro 15pf s 2 s 1 v cc c l 500 output under t est inputs outputs line re de di condition b a x1 1 no fault 0 1 x1 0 no fault 1 0 x0x x zz x1 x fault z z inputs outputs re de a - b r 00 +0.2v 1 00 -0.2v 0 00 inputs open 1 10 x z table 1. transmit function truth table table 2. receive function truth table +3v +3v 0v di di b a driver driver output output v o + differential differential output output v a ?v b 0v v o 1.5v 1.5v t plh plh t r t f v o 1/2v o 1/2v 1/2v o t phl phl t dplh dplh t dphl dphl t skew = skew = | t dplh - dplh - t dphl dphl | f sp481/485 sp481/485 = 1mhz; f 1mhz; f sp483 sp483 = 100khz 100khz ; t r < 10ns; t f < 10ns < 10ns
7 rev. 07/16/02 sp481/483/485 low power half-duplex rs485 transceivers ? copyright 2002 sipex corporation +3v 0v de 5v v ol a, b 0v 1.5v 1.5v t zl t zh v oh a, b 2.3v 2.3v t lz t hz 0.5v 0.5v output normally low output normally high f sp481/485 = 1mhz; f sp483 = 100khz; t r < 10ns; t f < 10ns +3v 0v re 5v r 0v 1.5v 1.5v t zl t zh r 1.5v 1.5v t lz t hz 0.5v 0.5v output normally low output normally high v il v ih f sp481/485 = 1mhz; f sp483 = 100khz; t r < 10ns; t f < 10ns figure 9. receiver enable and disable times figure 8. receiver propagation delays figure 7. driver enable and disable times v oh v ol r 1.5v 1.5v t phl f sp481/485 = 1mhz; f sp483 = 100khz; t r < 10ns; t f < 10ns output v 0d2 + v 0d2 a ?b 0v 0v t plh input t skew = | t phl - t plh |
8 rev. 07/16/02 sp481/483/485 low power half-duplex rs485 transceivers ? copyright 2002 sipex corporation a a1 a2 side view seating plane section b-b with plating symbol min nom max a 1.35 - 1.75 a1 0.1 - 0.25 a2 1.25 - 1.65 b 0.31 - 0.51 c 0.17 - 0.24 d e e1 e l 0.4 - 1.27 l1 l2 ?0o-8o ?1 5o - 15o note: dimensions in (mm) 8 pin nsoic jedec mo-012 (aa) variation 4.90 bsc 6.00 bsc 3.90 bsc 1.27 bsc 1.04 ref 0.25 bsc gauge plane l1 l ? 1 ? seating plane l2 view c to p view b see view c b b e e/2 e1 index area (d/2 x e1/2) e1/2 d 1 e c base metal b package: 8 pin nsoic
9 rev. 07/16/02 sp481/483/485 low power half-duplex rs485 transceivers ? copyright 2002 sipex corporation package: 8 pin pdip index area b n 1 23 n/2 c d1 ea eb e symbol min nom max a--0 .21 a1 0.15 - - a2 0.115 0.13 0.195 b0. 014 0.018 0.022 b2 0.045 0.06 0.07 b3 0.3 0.039 0.045 c0. 008 0.01 0.014 d0. 355 0.365 0.4 d1 0.005 - - e0.30. 31 0.325 e1 0.24 0.25 0.28 e ea eb - - 0.43 l0. 115 0.13 0.15 note: dimensions in (mm) .100 bsc .300 bsc 8 pin pdip jedec ms-001 (ba) variation e e1 d a l a2 a1 b b2 e b3 c
10 rev. 07/16/02 sp481/483/485 low power half-duplex rs485 transceivers ? copyright 2002 sipex corporation ordering information model temperature range package sp481cn ...................................................................................... 0 ? c to +70 ? c ............................................................................... 8-pin nsoic sp481cn/tr ................................................................................ 0 ? c to +70 ? c ............................................................................... 8-pin nsoic sp481cs ...................................................................................... 0 ? c to +70 ? c ................................................................................ 8-pin pdip sp481en .................................................................................... .-40 ? c to +85 ? c ............................................................................. 8-pin nsoic sp481en/tr .............................................................................. .-40 ? c to +85 ? c ............................................................................. 8-pin nsoic sp481es ..................................................................................... -40 ? c to +85 ? c .............................................................................. 8-pin pdip sp483cn ...................................................................................... 0 ? c to +70 ? c ............................................................................... 8-pin nsoic sp483cn/tr ................................................................................ 0 ? c to +70 ? c ............................................................................... 8-pin nsoic sp483cs ...................................................................................... 0 ? c to +70 ? c ................................................................................ 8-pin pdip sp483en ..................................................................................... -40 ? c to +85 ? c ............................................................................. 8-pin nsoic sp483en/tr ............................................................................... -40 ? c to +85 ? c ............................................................................. 8-pin nsoic sp483es ..................................................................................... -40 ? c to +85 ? c .............................................................................. 8-pin pdip sp485cn ...................................................................................... 0 ? c to +70 ? c ............................................................................... 8-pin nsoic sp485cn/tr ................................................................................ 0 ? c to +70 ? c ............................................................................... 8-pin nsoic sp485cs ...................................................................................... 0 ? c to +70 ? c ................................................................................ 8-pin pdip sp485en ..................................................................................... -40 ? c to +85 ? c ............................................................................. 8-pin nsoic sp485en/tr ............................................................................... -40 ? c to +85 ? c ............................................................................. 8-pin nsoic sp485es ..................................................................................... -40 ? c to +85 ? c .............................................................................. 8-pin pdip corporation analog excellence sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability aris ing out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others. sipex corporation headquarters and sales office 22 linnell circle billerica, ma 01821 tel: (978) 667-8700 fax: (978) 670-9001 e-mail: sales@sipex.com sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 available in lead free packaging. to order add ?-l? suffix to part number. example: sp485en/tr = standard; sp485en-l/tr = lead free /tr = tape and reel pack quantity is 2,500 for nsoic. click here to order samples
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