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1 date: 03/08/05 sp385e-1 true +3v to +5v rs-232 line driver/receiver ? copyright 2005 sipex corporation sp385e-1 features operates from 3.3v or 5v power supply meets true eia/tia-232-f standards from a +3.0v to +5.5v power supply meets eia-562 specifications at v cc 2.7v two drivers and receivers operates with 0.1 f capacitors high data rate ? 120kbps under load low power shutdown 1 a 3-state ttl/cmos receiver outputs low power cmos ? <1ma operation improved esd specifications: +15kv human body model +15kv iec1000-4-2 air discharge +8kv iec1000-4-2 contact discharge t rue +3v or +5v rs-232 line driver/receiver ? r 2 r 1 t 2 t 1 ttl/cmos inputs rs232 outputs ttl/cmos outputs rs232 inputs charge pumps now available in lead free packaging n/c c + v+ c - c + c - v- t out r in n/c on/off v gnd t out r in r out t in t in r out n/c 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 1 1 cc 2 2 2 1 2 2 1 1 1 2 20 pin ssop sp385e-1 description typical application circuit sipex's sp385-1 is an enhanced version of the sipex sp200 family of rs232 line drivers/ receivers. the sp385e-1 offers +3.3v operation for eia-562 and eia-232 applications. the sp385e-1 maintains the same performance features offered in its predecessors. the sp385e-1 is available in plastic soic or ssop packages operating over the commercial and industrial temperature ranges. the sp385e-1 is pin compatible to the ltc1385 eia-562 transceiver, except the drivers in the sp385e-1 can only be disabled with the on/off pin.
2 date: 03/08/05 sp385e-1 true +3v to +5v rs-232 line driver/receiver ? copyright 2005 sipex corporation electrical characteristics v cc = +3.3v 10%; cap on (v + ) and (v - ) = 1.0 f, c1 = c2 = 0.1 f; t min to t max unless otherwise noted. parameters min. typ. max. units conditions ttl input logic threshold low 0.8 volts t in ; on/off vcc = 3.3v high 2.0 volts t in ; on/off vcc = 3.3v logic pullup current 0.01 200 at in = 0v maximum data rate 120 kbps c l = 2500pf, r l = 3k ? ttl output ttl/cmos output voltage, low 0.4 volts i out = 1.6ma; vcc = 3.3v voltage, high v cc -0.6 volts i out = -1.0ma leakage current; t a = +25 c 0.05 10 a on/off=0v , 0 v out v cc eia-562 output output voltage swing 3.7 4.2 volts all transmitter outputs loaded with 3k ? to ground power-off output resistance 300 ? v cc = 0v; v out = 2v output short circuit current 35 ma infinite duration eia-562 input voltage range -15 +15 volts voltage threshold low 0.6 1.2 volts v cc = 3.3v, t a = +25 c high 1.5 2.4 volts v cc = 3.3v, t a = +25 c hysteresis 0.5 1.0 volts v cc = 3.3v, t a = +25 c resistance 3 5 7 k ? v in = 15v to ?15v dynamic characteristics driver propagation delay 1.0 s ttl to rs-562 receiver propagation delay 0.3 s rs-562 to ttl instantaneous slew rate 30 v/ sc l = 10pf, r l = 3k ? - 7k ? ; t a = +25 c transition region slew rate 10 v/ sc l = 2500pf, r l = 3k ? ; measured from +2v to -2v or -2v to +2v output enable time 200 ns output disable time 200 ns power requirements v cc power supply current 0.5 6 ma no load, t a = +25 c; v cc = 3.3v 8m a all transmitters r l = 3k ? t a = +25 c shutdown supply current 0.010 5 av cc = 3.3v, t a = +25 c this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. v cc ............................................................................................................................... ........................................... +6v v + ............................................................................................................................. (vcc-0.3v) to +13.2v v - ............................................................................................................................... ........................................ 13.2v input voltages t in ............................................................................................................................... ... -0.3 to (vcc +0.3v) r in ............................................................................................................................... ...................................... 15v output voltages t out ............................................................................................................. (v+, +0.3v) to (v-, -0.3v) r out ......................................................................................................................... -0.3v to (vcc +0.3v) short circuit duration t out ............................................................................................................................... ................... continuous power dissipation cerdip ................................................................................... 675mw (derate 9.5mw/ c above +70 c) plastic dip ............................................................................... 375mw (derate 7mw/ c above +70 c) small outline ............................................................................ 375mw (derate 7mw/ c above +70 c) absolute maximum ratings
3 date: 03/08/05 sp385e-1 true +3v to +5v rs-232 line driver/receiver ? copyright 2005 sipex corporation electrical characteristics v cc = +3.3v 10%; cap on (v + ) and (v - ) = 1.0 f, c1 = c2 = 0.1 f; t min to t max unless otherwise noted. parameters min. typ. max. units conditions ttl input logic threshold low 0.8 volts t in ; on/off high 2.4 volts t in ; on/off logic pullup current 0.01 200 at in = 0v maximum data rate 120 kbps c l = 2500pf, r l = 3k ? ttl output ttl/cmos output voltage, low 0.4 volts i out = 1.6ma; vcc = +5v voltage, high v cc -0.6 volts i out = -1.0ma leakage current; t a = +25 c 0.05 10 a en = v cc , 0v v out v cc eia-232 output output voltage swing 5 9 volts all transmitter outputs loaded with 3k ? to ground. power-off output resistance 300 ? v cc = 0v; v out = 2v output short circuit current 35 ma infinite duration eia-562 input voltage range -15 +15 volts voltage threshold low 0.8 1.5 volts v cc = 5v, t a = +25 c high 1.8 2.4 volts v cc = 5v, t a = +25 c hysteresis 0.5 1.0 volts v cc = 5v, t a = +25 c resistance 3 5 7 k ? v in = 15v to ?15v dynamic characteristics propagation delay, rs-232 to ttl 1 s ttl to rs-562 instantaneous slew rate 30 v/ sc l = 10pf, r l = 3k ? - 7k ? ; t a =+25 c transition region slew rate 10 v/ sc l = 2500pf, r l = 3k ? ; measured from +3v to -3v or -3v to +3v output enable time 200 ns output disable time 200 ns power requirements v cc power supply current 0.5 15 ma no load, t a = +25 c; v cc = 5v 25 ma all transmitters r l = 3k ? ; t a = +25 c shutdown supply current 1 10 av cc = 5v, t a = +25 c performance curves 0510 15 20 load current (ma) 0 6 8 10 12 v+ (volts) 2 4 25 30 35 40 v cc = 4v v cc = 5v -55 -40 0 25 70 85 125 t emperature ( c) 0 5 10 15 20 25 30 i cc (ma) v cc = 5v v cc = 4v v cc = 3v 4.5 4.75 5.0 5.25 5.5 v cc (volts) 6.8 7.4 7.6 7.8 8.0 8.2 8.4 v oh (volts) 7.0 7.2 load current = 0ma t a = 25 c 02468101214 load current (ma) v? voltage (volts) -3 -4 -5 -6 -7 -8 -9 -10 -11 v cc = 5v v cc = 4v
4 date: 03/08/05 sp385e-1 true +3v to +5v rs-232 line driver/receiver ? copyright 2005 sipex corporation pinout typical operating circuit 18-pin soic 20-pin ssop on/off v gnd t out r in r out t in t in r out n/c c + v+ c - c + c - v- t out r in 2 1 cc 2 1 1 1 1 2 3 4 6 7 8 5 9 18 17 16 15 13 12 11 14 10 1 1 2 2 2 2 on/off v gnd t out r in r out t in t in r out n/c n/c c + v+ c - c + c - v- t out r in n/c 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 1 1 cc 2 2 2 1 2 2 1 1 1 2 r 2 10 9 r in r out 2 r 1 13 14 r in r out 1 t 2 11 8 t out 2 t 1 12 15 t out 1 16 400k ? 400k ? ttl/cmos inputs rs232 outputs 4 2 c + 7 17 v v+ + + 0.1 f 6.3v +5v input 3 ttl/cmos outputs rs232 inputs 2 1 5k ? 0.1 f 16v 5k ? 6 5 c + + 0.1 f 16v +5v to +10v v oltage doubler 0.1 f sp385e-1 + 18 on/off + 0.1 f 16v soic package +10v to -10v v oltage inverter v- t in 2 t in 1 gnd r 2 12 9 r in r out 2 r 1 15 16 r in r out 1 t 2 13 8 t in 2 t out 2 t 1 14 17 t in 1 t out 1 18 gnd 400k ? 400k ? ttl/cmos inputs rs232 outputs 4 2 c + 7 19 vcc v + + 0.1 f 6.3v +5v to +10v v oltage doubler +5v input 3 v ttl/cmos outputs rs232 inputs 2 1 5k ? 0.1 f 16v 5k ? 6 5 c + + 0.1 f 16v +10v to -10v v oltage inverter 0.1 f sp385e-1 + 20 on/off + 0.1 f 16v ssop package
5 date: 03/08/05 sp385e-1 true +3v to +5v rs-232 line driver/receiver ? copyright 2005 sipex corporation features? the sipex sp385e-1 is a +3v to +5v eia-232/ eia-562 line transceiver. it is a pin-for-pin alter- native for the sp310a and will operate in the same socket with 0.1 f capacitors, either polarized or non?olarized, in +3v supplies. the sp385e-1 offers the same features such as 120kbps guaran- teed transmission rate, increased drive current for longer and more flexible cable configurations, low power dissipation and overall ruggedized con- struction for commercial and industrial environ- ments. the sp385e-1 also includes a shutdown feature that tri-states the drivers and the receivers. the sp385e-1 includes a charge pump voltage con- verter which allows it to operate from a single +3.3v or +5v supply. these converters double the v cc voltage input in order to generate the eia-232 or eia- 562 output levels. for +5v operation, the sp385e-1 driver outputs adhere to all eia-232-f and ccitt v.28 specifications. while at +3.3v operation, the outputs adhere to eia-562 specifications. due to sipex's efficient charge pump design, the charge pump levels and the driver outputs are less noisy than other 3v eia-232 transceivers. the sp385e-1 has a single control line which simultaneously shuts down the internal dc/dc converter and puts all transmitter and receiver outputs into a high impedance state. the sp385e-1 is available in 18-pin plastic soic and 20-pin plastic ssop packages for operation over commercial and industrial tem- perature ranges. please consult the factory for surface-mount packaged parts supplied on tape- on-reel as well as parts screened to mil-m- 38510. the sp385e-1 is ideal for +3.3v battery appli- cations requiring low power operation. the charge pump strength allows the drivers to pro- vide 4.0v signals, plenty for typical eia-562 applications since the eia-562 receivers have input sensitivity levels of less than 3v. theory of operation the sp385e-1 device is made up of three basic circuit blocks ?1) a driver/transmitter, 2) a re- ceiver and 3) a charge pump. driver/transmitter the drivers are inverting level transmitters, that convert ttl or cmos logic levels to 5.0v eia/ tia-232 levels inverted relative to the input logic levels. typically the rs-232 output voltage swing is 5.5v with no load and at least 5v minimum fully loaded. the driver outputs are protected against infinite short-circuits to ground without degradation in reliability. driver outputs will meet eia/tia-562 levels of 3.7v with supply volt- ages as low as 2.7v. the instantaneous slew rate of the transmitter output is internally limited to a maximum of 30v/ s in order to meet the standards [eia 232-d 2.1.7, paragraph (5)]. however, the transition region slew rate of these enhanced products is typically 10v/ s. the smooth transition of the loaded out- put from v ol to v oh clearly meets the monotonic- ity requirements of the standard [eia 232-d 2.1.7, paragraphs (1) & (2)]. receivers the receivers convert rs-232 input signals to inverted ttl signals. since the input is usually from a transmission line, where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 500mv. this ensures that the receiver is virtually immune to noisy transmission lines. the input thresholds are 0.8v minimum and 2.4v maximum, again well within the 3v rs-232 requirements. the receiver inputs are also pro- tected against voltages up to 15v. should an input be left unconnected, a 5k ? pull-down resis- tor to ground will commit the output of the receiver to a high state. in actual system applications, it is quite possible for signals to be applied to the receiver inputs before power is applied to the receiver circuitry. this occurs for example when a pc user attempts to print only to realize the printer wasn? turned on. in this case an rs-232 signal from the pc will appear on the receiver input at the printer. when the printer power is turned on, the receiver will operate normally. all of these enhanced devices are fully protected.
6 date: 03/08/05 sp385e-1 true +3v to +5v rs-232 line driver/receiver ? copyright 2005 sipex corporation charge pump the charge pump is a sipex ?atented design (5,306,954) and uses a unique approach com- pared to older less?fficient designs. the charge pump still requires four external capacitors, but uses a four?hase voltage shifting technique to attain symmetrical 10v power supplies. there is a free?unning oscillator that controls the four phases of the voltage shifting. a description of each phase follows. phase 1 ?v ss charge storage ?uring this phase of the clock cycle, the positive side of capacitors c 1 and c 2 are initially charged to +5v. c l + is then switched to ground and the charge in c 1 is transferred to c 2 . since c 2 + is connected to +5v, the voltage potential across capacitor c 2 is now 10v. phase 2 ?v ss transfer ?phase two of the clock con- nects the negative terminal of c 2 to the v ss storage capacitor and the positive terminal of c 2 to ground, and transfers the generated ?0v to c 3 . simultaneously, the positive side of capaci- tor c 1 is switched to +5v and the negative side is connected to ground. phase 3 ?v dd charge storage ?the third phase of the clock is identical to the first phase ?the charge transferred in c 1 produces ?v in the negative terminal of c 1 , which is applied to the negative side of capacitor c 2 . since c 2 + is at +5v, the voltage potential across c 2 is l0v. phase 4 ?v dd transfer ?the fourth phase of the clock connects the negative terminal of c 2 to ground, and transfers the generated l0v across c 2 to c 4 , the v dd storage capacitor. again, simultaneously with this, the positive side of capacitor c 1 is switched to +5v and the negative side is con- nected to ground, and the cycle begins again. since both v + and v are separately generated from v cc ; in a no?oad condition v + and v will be symmetrical. older charge pump approaches that generate v from v + will show a decrease in the magnitude of v compared to v + due to the inherent inefficiencies in the design. the clock rate for the charge pump typically operates at 15khz. the external capacitors can be as low as 0.1 f with a 16v breakdown voltage rating. figure 1. charge pump ?phase 1 figure 2. charge pump ?phase 2 figure 3. charge pump waveforms 10v gnd gnd -10v v cc = +5v ?5v ?5v +5v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + ++ ? ? ? ? v cc = +5v ?10v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + ++ ? ? ? ? c2+ c2-
7 date: 03/08/05 sp385e-1 true +3v to +5v rs-232 line driver/receiver ? copyright 2005 sipex corporation shutdown (on/off) the sp385e-1 has a shut-down/standby mode to conserve power in battery-powered systems. to activate the shutdown mode, which stops the operation of the charge pump, a logic "0" is applied to the appropriate control line. the shutdown mode is controlled on the sp385e-1 by a logic "0" on the on/off control line (pin 18 for the soic and pin 20 for the ssop packages); this puts the transmitter outputs in a tri- state mode. esd tolerance the sp385e-1 device incorporates ruggedized esd cells on all driver output and receiver input pins. the esd structure is improved over our previous family for more rugged applications and environments sensitive to electro-static discharges and associated transients. the improved esd tolerance is at least 15kv with- out damage nor latch-up. there are different methods of esd testing applied: a) mil-std-883, method 3015.7 b) iec1000-4-2 air-discharge c) iec1000-4-2 direct contact the human body model has been the generally accepted esd testing method for semiconductors. this method is also specified in mil-std-883, method 3015.7 for esd testing. the premise of this esd test is to simulate the human body? potential to store electro-static energy and discharge it to an integrated circuit. the simulation is performed by using a test model as shown in figure 6 . this method will test the ic? capability to withstand an esd transient during normal handling such as in manufacturing areas where the ics tend to be handled frequently. the iec-1000-4-2, formerly iec801-2, is generally used for testing esd on equipment and systems. for system manufacturers, they must guarantee a certain amount of esd protection since the system itself is exposed to the outside environment and human presence. the premise with iec1000-4-2 is that the system is required to withstand an amount of static electricity when esd is applied to points and surfaces of the equipment that are accessible to personnel during normal usage. the transceiver ic receives most of the esd current when the esd source is applied to the connector pins. the test circuit for iec1000-4-2 is shown on figure 7 . there are two methods within iec1000-4-2, the air discharge method and the contact discharge method. with the air discharge method, an esd voltage is applied to the equipment under test (eut) through air. this simulates an electrically charged person ready to connect a cable onto the rear of figure 4. charge pump ?phase 3 v cc = +5v ?5v +5v ?5v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + ++ ? ? ? ? figure 5. charge pump ?phase 4 v cc = +5v +10v v ss storage capacitor v dd storage capacitor c 1 c 2 c 3 c 4 + + ++ ? ? ? ? figure 6. esd test circuit for human body model r c c s r s sw1 sw2 r c device under t est dc power source c s r s sw1 sw2 figure 7. esd test circuit for iec1000-4-2 r s and r v add up to 330 ? f or iec1000-4-2. r s and r v add up to 330 ? for iec1000-4-2. contact-discharge module r v r c c s r s sw1 sw2 r c device under t est dc power source c s r s sw1 sw2 r v contact-discharge module
8 date: 03/08/05 sp385e-1 true +3v to +5v rs-232 line driver/receiver ? copyright 2005 sipex corporation the system only to find an unpleasant zap just before the person touches the back panel. the high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. this energy, whether discharged directly or through air, is predominantly a function of the discharge current rather than the discharge voltage. variables with an air discharge such as approach speed of the object carrying the esd potential to the system and humidity will tend to change the discharge current. for example, the rise time of the discharge current varies with the approach speed. the contact discharge method applies the esd current directly to the eut. this method was devised to reduce the unpredictability of the esd arc. the discharge current rise timeis constant since energy is directly transferred without the air-gap arc. in situations such as hand held systems, the esd charge can be directly discharged to the equipment from a person already holding the equipment. the current is transferred on to the keypad or the serial port of the equipment directly and then travels through the pcb and finally to the ic. the circuit models in figures 6 & 7 represent the typical esd testing circuit used for all three methods. the c s is initially charged with the dc power supply when the first switch (sw1) is on. now that the capacitor is charged, the second switch (sw2) is on while sw1 switches off. the voltage stored in the capacitor is then applied through r s , the current limiting resistor, onto the device under test (dut). in esd tests, the sw2 switch is pulsed so that the device under test receives a duration of voltage. for the human body model, the current limiting resistor (r s ) and the source capacitor (c s ) are 1.5k ? an 100pf, respectively. for iec-1000-4- 2, the current limiting resistor (r s ) and the source capacitor (c s ) are 330 ? an 150pf, respectively. the higher c s value and lower r s value in the iec1000-4-2 model are more stringent than the human body model. the larger storage capacitor injects a higher voltage to the test point when sw2 is switched on. the lower current limiting resistor increases the current charge onto the test point. sp385e-1 human body iec1000-4-2 family model air discharge direct contact level driver outputs 15kv 15kv 8kv 4 receiver inputs 15kv 15kv 8kv 4 30a 15a 0a 0ns 30ns figure 8. esd test waveform for iec1000-4-2 table 1. transceiver esd tolerance levels
9 date: 03/08/05 sp385e-1 true +3v to +5v rs-232 line driver/receiver ? copyright 2005 sipex corporation see view c b b a2 a a1 c with plating base metal b section b-b symbol min nom max a 2.350 - 2.650 a1 0.100 - 0.300 a2 2.050 - 2.550 b 0.310 - 0.510 c 0.200 - 0.330 d e e1 e l 0.400 - 1.270 l1 l2 ?0o-8o ?1 5o - 15o note: dimensions in (mm) 18 pin wsoic jedec ms-013 (ab) variation 11.55 bsc 10.30 dsc 7.50 bsc 1.27 bsc 1.04 ref 0.25 bsc to p view e e e/2 e1 b index area (d/2 x e1/2) e1/2 d 1 2 3 l1 l 1 1 seating plane gauge plane l2 seating plane side view view c package: 20 pin wsoic
10 date: 03/08/05 sp385e-1 true +3v to +5v rs-232 line driver/receiver ? copyright 2005 sipex corporation b c with lead finish base metal seating plane a2 a a1 see detail ?a? l1 l seaing plane 2 nx r r1 a a detail a gauge plane section a-a d index area d 2 x 2 e1 n 1 2 e1 e b symbol min nom max a--2 a1 0.05 - - a2 1.65 1.75 1.85 b0.22- 0.38 c0.09- 0.25 d6.97. 27.5 e7.47. 88.2 e1 5 5.3 5.6 l0.550 .75 0.95 l1 ?0o4 o8o note: dimensions in (mm) 20 pin ssop jedec mo-153 (ae) variation 1.25 ref 20 pin ssop package: 20 pin ssop
11 date: 03/08/05 sp385e-1 true +3v to +5v rs-232 line driver/receiver ? copyright 2005 sipex corporation ordering information part number temperature range package sp385eca-1 ........................................... 0 c to +70 c .......................................... 20?pin ssop sp385eca-1/tr ..................................... 0 c to +70 c .......................................... 20?pin ssop sp385eea-1 .......................................... ?40 c to +85 c ........................................ 20?pin ssop sp385eea-1/tr .................................... ?40 c to +85 c ........................................ 20?pin ssop sp385ect-1 ............................................ 0 c to +70 c ........................................ 18?pin wsoic sp385ect-1/tr ...................................... 0 c to +70 c ........................................ 18?pin wsoic sp385eet-1 .......................................... ?40 c to +85 c ...................................... 18?pin wsoic sp385eet-1/tr .................................... ?40 c to +85 c ...................................... 18?pin wsoic 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 herein; neither does it convey any license under its patent rights nor t he rights of others. sipex corporation headquarters and sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 /tr = tape and reel pack quantity is 1,500 for wsoic and ssop. available in lead free packaging. to order add ?-l? suffix to part number. example: sp385eea-1/tr = standard; sp385eea-1-l/tr = lead free click here to order samples

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