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1 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation sp3224e-sp3227e features 15kv esd protected rs-232 i/o pins auto on-line ? plus automatic power saving mode meets true eia/tia-232-f standards from +3.0v to +5.5v power supply. adheres to eia/tia-562 for interoperability with eia/tia-232 down to a +2.7v supply voltage regulated charge pump yields stable rs-232 outputs drop-in replacement to max3224, icl3224, max3225, icl3225, max3226, icl3226, max3227 and icl3227 sp3224e and sp3225e reduced emi with a slew rate controlled 250kbps data rate sp3226e and sp3227e- high speed data rate of 1 mbps. available in rohs compliant, lead free packaging 3.0v to 5.5v rs-232 transceivers with auto on-line ? plus description typical applications diagnostic/serial ports on embedded applications handheld test equipment pc related peripherals and equipment battery powered equipment point-of-sale equipment set-top box the sp3224e/3225e are 2-driver/2-receiver devices and the sp3226e/sp3227e are 1- driver/1-receiver devices. all are ideal for computer peripherals, point-of-sale equipment, consumer and embedded applications. these devices use an internal high-ef?ciency, charge-pump power supply that requires only 0.1f capacitors in 3.3v operation. this charge pump and sipexs driver architecture allow it to deliver compliant rs-232 perfor - mance from a single power supply ranging from +3.0v to +5.5v. at voltages between 2.7v and 3.0v the driver outputs are compliant with rs-562 and can interface to rs-232 over short cables. the auto on-line ? plus feature allows the device to automatically wake-up during a shut - down state upon detecting activity and to enter a low power shutdown if idle. this power saving feature functions without system intervention or modi?cations to software or driv - ers. selection table all devices feature 3.0v to 5.5v power supply, 4 small charge pump capacitors, and 15kv esd protection. device data rate (bps) no. of drivers/receivers ready pin low-power shutdown package sp3224e 250k 2/2 yes auto on-line ? plus 20 ssop/tssop sp3225e 1m 2/2 yes auto on-line ? plus 20 ssop/tssop sp3226e 250k 1/1 yes auto on-line ? plus 16 ssop/tssop sp3227e 1m 1/1 yes auto on-line ? plus 16 ssop/tssop s o l v e d b y t m sp3224e sp3225e 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 ready c1+ v+ c1- c2+ c2- v- t 2 out r 2 in r 2 out shutdow n v cc gnd t 1 out r 1 in r 1 out 14 13 12 11 online t 1 in t 2 in status s o l v e d b y t m
2 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation electrical specifications 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 speci?cations below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. absolute maximum ratings supply voltage (vcc).................................................-0.3v to + 6.0v v+ (note 1)................................................................-0.3v to + 7.0v v- (note 1).................................................................+0.3v to - 7.0v |v+| + |v-| .................................................................................+13v input voltage at ttl input pins ............................-0.3v to vcc+0.3v rxin......................................................................................... 18v driver output (from ground).................................................. 13.2v rxout, status ..................................................-0.3v to vcc+0.3v short circuit duration, txout to gnd,. continuous (one output at a time maximum) storage temperature...............................................-65c to +150c operating temperature sp322xecx...........................0c to +70c operating temperature sp322xeex........................-40c to +85c lead temperature (soldering, 10s)....................................... +300c maximum junction temperature.....................................................150c thermal derating, junction to ambient ssop20.............................................................................. ja =83c/w tssop20....................................................................... ja =110.7c/w ssop16.............................................................................. ja =87c/w tssop16....................................................................... ja =100.4c/w note 1: v+ and v- can have maximum magnitudes of 7v, but their absolute difference cannot exceed 13v. unless otherwise noted v cc = +3.0v to +5.5v, t amb = t min to t max ,. typical values are at t amb = +25c. c1Cc4 = 0.1f tested at 3.3v 10%. c1=0.047f c2Cc4 = 0.33f tested at 5v 10%. parameters symb test conditions min. typ. max. unit dc characteristics supply current, auto on-line ? plus i cc 3 receivers idle, txin = vcc or gnd, online = gnd, shutdown = vcc note 2 1 10 a supply current, shutdown i cc 2 shutdown = gnd 1 10 a supply current, active i cc 1 online = shutdown = vcc, no load 1.5 2.0 ma supply current, active i cc 1 online = shutdown = v cc =3.3v, no load 0.7 1.0 ma driver input and logic input pins logic input voltage high v ih vcc = 3.3v 2 v v ih vcc = 5.0v 2.4 low v il 0.8 logic threshold v t 1.5 logic input leakage current i il 0.05 1.0 a logic input hysteresis v hys 100 mv receiver outputs and status output receiver output voltage low v ol i out = -1.6ma 0.4 v receiver output voltage high v oh i out = 1ma vcc - 0.6 v note 2: characterized, not 100% tested.
3 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation electrical specifications parameters symb test conditions min. typ. max. driver outputs output voltage swing v o output load = 3k? to gnd 5.0 6.0 v output load = open circuit 15.0 short circuit current v out = 0v 60 ma power-off impedance vcc=v+ = v- = 0 transmitter outputs= 2v 300 10m ? output leakage current vcc = 0 or 3v to 3.3v, v out = 12v, drivers disabled 25 a receiver inputs input voltage range -15 15 v input threshold low vcc = 3.3v 0.6 1.2 v vcc = 5.0v 0.8 1.5 input threshold high vcc = 3.3v 1.5 2.4 v vcc = 5.0v 1.8 2.4 input hysteresis 500 mv input resistance 3 5 7 k? esd protection esd protection for r_in, t_out pins human body model 15 kv all other pins human body model 2 kv auto on-line ? plus ( online = gnd, shutdown = vcc) rx input threshold to status output high 2.7 v rx input threshold to status output low 0.3 v threshold to status high t sth 0.5 s threshold to status low t stl 30 s rx or tx transition to drivers enabled t online note 3 100 s last rx or tx transition to drivers disabled t offline note 2, 3 15 30 60 sec note 3: a transmitter/receiver edge is de?ned as a transition through input logic thresholds. unless otherwise noted v cc = +3.0v to +5.5v, t amb = t min to t max ,. typical values are at t amb = +25c. c1Cc4 = 0.1f tested at 3.3v 10%. c1=0.047f c2Cc4 = 0.33f tested at 5v 10%.
4 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation timing characteristics unless otherwise noted v cc = +3.0v to +5.5v, t amb = t min to t max ,. typical values are at t amb = +25c. c1Cc4 = 0.1f tested at 3.3v 10%. c1=0.047f c2Cc4 = 0.33f tested at 5v 10% parameters symbol test conditions min. typ. max. unit sp3224e and sp3226e maximum data rate r l = 3k?, c l = 1000pf. one transmitter switching. 250 kbps transition -region slew rate measurement taken from +3.0v to -3.0v or -3.0v to +3.0v, t amb = 25 c r l = 3k? to 7k?, c l = 150pf to 1000pf 4 30 v/s receiver propagation delay t rphl , t rplh r_in to r_out, c l = 150pf 0.22 s receiver output enable time t rzh , t rzl r l = 3k?, c l = 150pf 0.2 2 s receiver output disable time t rhz , t rlz 0.2 2 s receiver skew |t phl - t plh | at 1.5v 200 ns parameters symbol test conditions min. typ. max. unit sp3225e and sp3227e maximum data rate r l = 3k?, c l = 250pf. one transmitter switching 1000 kbps r l = 3k?, c l = 1000pf. one transmitter switching 500 kbps instantaneous slew rate measurement taken from +3.0v to -3.0v or -3.0v to +3.0v, t amb = 25c 24 150 v/s r l = 3k? to 7k?, c l = 150pf to 250pf driver skew |t dphl - t dplh | at zero crossing 75 ns receiver propagation delay t rphl , t rplh r_in to r_out, c l = 150pf 0.20 s receiver output enable time t rzh , t rzl 0.3 2 s receiver output disable time t rhz , t rlz 0.2 2 s receiver skew |t phl - t plh | at 1.5v 80 ns
5 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation 0 5 10 15 20 25 30 35 40 45 0 1000 2000 3000 4000 5000 load capacitance (pf) transmitter output slew rate (v/us) srpos srneg sravg typical performance characteristics:curves sp3224e/sp3226e transmitter input to receiver output propagation delay vs. load capacitance 0 0.5 1 1.5 2 2.5 0 1000 2000 3000 4000 5000 load capacitance (pf) txin to rxout propagation delay (us) sp3224e/sp3226e transmitter output slew rate vs. load capacitance 0 5 10 15 20 25 30 0 1000 2000 3000 4000 5000 load capacitance (pf) transmitter output slew rate (v/us) srpos srneg sravg sp3224e/sp3226e transmitter output voltage vs. load capacitance -6 -4 -2 0 2 4 6 0 1000 2000 3000 4000 5000 load capacitance (pf) transmitter output voltage (v) v+ v- sp3225e/sp3227e transmitter input to receiver output propagation delay vs. load capacitance 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0 1000 2000 3000 4000 5000 load capacitance (pf) txin to rxout propagation delay (us) sp3225e/sp3227e transmitter output slew rate vs. load capacitance sp3225e/sp3227e transmitter output voltage -6 -4 -2 0 2 4 6 0 1000 2000 3000 4000 5000 load capacitance (pf) trasmitter output voltage (v) v+ v- txin to rxout propagation delay (us) txin to rxout propagation delay (us) transmitter output slew rate (v/us) transmitter output slew rate (v/us) transmitter output voltage (v) transmitter output voltage (v)
6 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation 0 50 100 150 200 250 0 500 1000 1500 2000 2500 3000 3500 load capacitance (pf) transmitter skew (ns) sp3224, 250kbps sp3225, 1mbps 0 5 10 15 20 25 30 0 1000 2000 3000 4000 5000 load capacitance (pf) supply current (ma) sp3225, 1mbps sp3227 sp3224, 250kbps sp3226 driver skew vs. load capacitance supply current vs. load capacitance transmitter skew (ns) supply current (ma) charge pump turn-on time versus temperature 50 55 60 65 70 75 80 85 -55 -30 -5 20 45 70 95 temperature (c) charge pump turn-on time (us) charge pump turn-on time vs. temperature charge pump turn-on time (us) typical performance characteristics:curves
7 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation typical performance characteristics: scope shots sp3224e/sp3226e waveforms for 250kbps clock rate, rl=3k?, cl=1000pf sp3224e/sp3226e waveforms for 250kbps clock rate, rl=3k?, cl=4700pf sp3224e/sp3226e charge pump out of shutdown sp3224e/sp3226e charge pump into shutdown sp3224e/sp3226e charge pump power on time, vcc=3.3v sp3224e/sp3226e charge pump waveforms for 250kbp clock rate all charge pump waveforms use charge pump capacitor values c1-c4 = 0.1f
8 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation sp3224e/sp3226e c2+ charge pump waveforms, vcc=3.3v, all channels switching sp3224e/sp3226e c2+ charge pump waveforms, vcc=5v, all channels switching sp3225e/sp3227e waveforms for 1mbps clock rate, rl=3k?, cl=50pf sp3225e/sp3227e waveforms for 1mbps clock rate, rl=3k?, cl=250pf sp3225e/sp3227e waveforms for 1mbps clock rate, rl=3k?, cl=1000pf sp3225e/sp3227e charge pump out of shutdown typical performance characteristics: scope shots all charge pump waveforms use charge pump capacitor values c1-c4 = 0.1f
9 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation typical performance characteristics sp3225e/sp3227e charge pump into shutdown sp3225e/sp3227e charge pump power on time, vcc=3.3v sp3225e/sp3227e charge pump waveforms for 1mbps clock rate sp3225e/sp3227e charge pump waveforms, vcc=3.3v, all chan - nel switching sp3225e/sp3227e charge pump waveforms, vcc=5v, all channel switching all charge pump waveforms use charge pump capacitor values c1-c4 = 0.1f
10 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation generator (see note b) 50? 3v shutdown rs-232 output cl (see note a) rl test circuit figure 1. driver slew rate sr= 6v t thl or t tlh t tlh t thl 3v -3v 3v -3v 3v 0v voh vol input output voltage waveforms a. cl includes probe and jig capacitance b. the pulse generator has the following characteristics: prr= 250kbit/s, zo=50?, 50% duty cycle, t r 10ns, t f 10ns notes generator (see note b) 50? 3v shutdown rs-232 output cl (see note a) rl test circuit figure 2. driver propagation and skew t dpl h t dphl 1.5v 50% 50% 3v 0v voh vol input output voltage waveforms 1.5v skew= i t dphl - t dplh i a. cl includes probe and jig capacitance b. the pulse generator has the following characteristics: prr= 250kbit/s, zo=50?, 50% duty cycle, t r 10ns, t f 10ns notes characterization circuits and waveforms generator (see note b) 50? 3v shut down rs-232 output cl (see note a) test circuit notes a. cl includes probe and jig capacitance b. the pulse generator has the following characteristics: prr= 250kbit/s, zo=50?, 50% duty cycle, t r 10ns, t f 10ns figure 3. receiver propagation delay and skew t rpl h t rphl 1.5v 50% 50% 3v 0v voh vol input output voltage waveforms 1.5v 3v or 0v online skew= i t rphl - t rplh i 3v or 0v online 3v or 0v shutdown 50? generator (see note b) cl (see note a) output rl gnd vcc s1 test circuit notes: a cl includes probe and jig capacitance b. the pulse generator has the folowing characteristics zo=50?, 50% duty cycle, t r 10ns, t f 10ns c. t plz and t phz are the same as t dis d. t pzl and t pzh are the same as t en figure 4. receiver enable and disable times voltage waveforms input t phz 1.5v 1.5v 3v 0v voh 50% 0.3v (51 at gnd) output t plz (51 at vcc) output 0.3v 50% vol t pzl (s1 at vcc) t pzh
11 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation theory of operation description the sp3224e and sp3225e are 2-driver/ 2-receiver devices. the sp3226e and sp3227e are 1-driver/1-receiver devices. all are ideal for serial ports in embedded, consumer, portable, or handheld applica - tions. the transceivers meet the eia/tia- 232 and itu-t v.28/v.24 communication protocols for reliable serial communication. the devices feature sipexs proprietary and patented (u.s. 5,306,954) on-board charge pump circuitry that generates 5.5v rs-232 voltage levels from a single +3.0v to +5.5v power supply. the sp3224e-sp3227e are ideal choic - es for power sensitive designs. with the auto on-line ? plus enabled, the sp3224e- sp3227e reduce supply current to 1a whenever the transceivers are in idle. in shutdown, the internal charge pump and the drivers will shut down. this feature al - lows design engineers to address power saving concerns without major design changes. theory of operation the sp3224e-sp3227e are made up of four basic circuit blocks: 1. drivers, 2. re - ceivers, 3. the sipex proprietary charge pump, and 4. auto on-line ? plus circuitry. drivers the drivers are inverting level transmit - ters that convert ttl or cmos logic lev - els to 5.0v eia/tia-232 levels with an inverted sense relative to the input logic levels. typically, the rs-232 output volt - age swing is +5.4v with no load and +5v minimum fully loaded. the driver outputs are protected against in?nite short-circuits to ground without degradation in reliabili - ty. these drivers comply with the eia-tia- 232-f and all previous rs-232 versions. unused driver inputs should be connected to gnd or vcc. the drivers can guarantee output data rates fully loaded with 3k? in parallel with 1000pf (sp3224e/sp3226e), or 3k? in parallel with 250pf (sp3225e/sp3227e) ensuring compatibility with pc-to-pc com - munication software. the slew rate of the driver output on the sp3224e/sp3226e is internally limited to a maximum of 30v/s in order to meet the eia standards (eia rs-232d 2.1.7, paragraph 5). the slew rate of sp3225e/sp3227e is not limited to enable higher speed data transfers. the transition of the loaded output from high to low also meets the monotonic signal transition requirements of the standard. receivers the receivers convert eia/tia-232 signal levels to ttl or cmos logic output lev - els. receivers remain active during device shutdown. since receiver input is usually from a transmission line where long cable lengths and system interference can de - grade the signal, the inputs have a typical hysteresis margin of 500mv. this ensures that the receiver is virtually immune to noisy transmission lines. should an input be left unconnected, an internal 5k? pulldown re - sistor to ground will commit the output of the receiver to a high state. charge pump the charge pump is a sipexCpatented de - sign (us patent #5,306,954) and uses a unique approach compared to older less- ef?cient designs. the charge pump still requires four external capacitors, but uses a four phase voltage shifting technique to attain symmetrical 5.5v power supplies. the internal power supply consists of a regulated dual charge pump that provides output voltages 5.5v regardless of the in - put voltage (vcc) over the +3.0v to +5.5v range. this is important to maintain com - pliant rs-232 levels regardless of power supply ?uctuations. the charge pump operates in a discontinu - ous mode using an internal oscillator. if the output voltages are less than a magnitude
12 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation theory of operation of 5.5v, the charge pump is enabled. if the output voltages exceed a magnitude of 5.5v, the charge pump is disabled. this os - cillator controls the four phases of the volt - age shifting. a description of each phase follows. highly ef?cient charge pump the charge pump is used to generate posi - tive and negative signal voltages for the rs-232 drivers. this enables fully compli - ant rs-232 and v.28 signals from a single 3.0 or 5.5v power supply. the charge pumps use four external capac - itors to hold and transfer electrical charge. the sipex patented design (us patent #5,306,954) uses a unique approach com - pared to older less ef?cient designs. the pumps use a fourCphase voltage shifting technique to attain symmetrical v+ and v- power supplies. an intelligent control oscil - lator regulates the operation of the charge pump to maintain the proper voltages at maximum ef?ciency. phase 1 v ss charge store and double: the posi - tive terminals of capacitors c1 and c2 are charged from v cc with their negative termi - nals initially connected to ground. c1+ is then connected to ground and the stored charge from c1C is superimposed onto c2C . since c2+ is still connected to v cc the voltage potential across capacitor c2 is now 2 x v cc . phase 2 v ss transfer and invert: phase two con - nects the negative terminal of c2 to the v ss storage capacitor and the positive terminal of c2 to ground. this transfers the doubled and inverted (vC) voltage onto c4. mean - while, capacitor c1 charged from v cc to prepare it for its next phase. phase 3 v dd charge store and double: phase three is identical to the ?rst phase. the posi - tive terminals of capacitors c1 and c2 are charged from v cc with their negative termi - nals initially connected to ground. c1+ is then connected to ground and the stored charge from c1C is superimposed onto c2C. since c2+ is still connected to v cc the voltage potential across capacitor c2 is now 2 x v cc . phase 4 v dd transfer: the fourth phase connects the negative terminal of c2 to ground and the positive terminal of c2 to the v dd stor - age capacitor. this transfers the doubled (v+) voltage onto c3. meanwhile, capaci - tor c1 charged from v cc to prepare it for its next phase. the sipex charge pump generates v+ and vC independently from v cc . hence in a no- load condition v+ and v- will be symmetri - cal. older charge pump approaches gen - erate v+ and then use part of that stored charge to generate v-. because of inherent losses the magnitude of v- will be smaller than v+ on these older designs. under lightly loaded conditions the intelli - gent pump oscillator maximizes ef?ciency by running only as needed to maintain v+ and vC. since interface transceivers often spend much of their time at idle this power- ef?cient innovation can greatly reduce total power consumption. this improvement is made possible by the independent phase sequence of the sipex charge pump design. the clock rate for the charge pump typi - cally operates at greater than 70khz allow - ing the pump to run ef?ciently with small 0.1f capacitors. ef?cient operation de - pends on rapidly charging and discharging c1 and c2, therefore capacitors should be mounted close to the ic and have low esr (equivalent series resistance). inexpensive surface mount ceramic capacitors (such as
13 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation theory of operation the sp3224e-sp3227e devices have the advanced auto on-line ? plus feature rs-232 signals use both positive and neg - ative voltages of greater than 5v magni - tude. receivers have nominal 5k? imped - ance to ground. even when idle, drivers will maintain output signal voltage creating a continuous current ?ow. in low power, battery operated devices this constant cur - rent drain can decrease battery life signi?cantly. are widely used for power-supply decou - pling) are ideal for use on the charge pump. the charge pumps are designed to be able to function properly with a wide range of capacitor styles and values. if polarized ca - pacitors are used the positive and negative terminals should be connected as shown on the typical operating circuit. capacitance values may be increased if operating at higher v cc or to provide great - er stability as the capacitors age. minimum recommended charge pump capacitor values input voltage v cc charge pump capacitor value for sp32xx 3.0v to 3.6v c1-c4=0.1f 4.5v to 5.5v c1=0.047f, c2-c4=0.33f 3.0v to 5.5v c1-c4=0.22f charge pump capacitor v alues c 2 + - v cc c 3 c 4 c 1 + + + e - e - phases 1 and 3: store/double. double charge from c1 onto c2. c2 is now charged to -2xvcc + c 2 + - v cc c 3 c 4 c 1 + + + e - + e + e + c 2 + - v cc c 3 c 4 c 1 + + + phase 2 C vss transfer from c2 to c4. meanwhile c1 is charged to vcc e - e - e - + vss transfer from c2 to c3. meanwhile c1 is charged to vcc v dd v- v+ v- v+ v+ patented 5,306,954 (sipex, inc.) phase 4 v dd charge pump phases
14 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation that saves power by turning off the charge pumps and driver outputs when the trans - ceiver inputs are idle for more than 30 sec - onds. auto on-line ? plus is equivalent to maxims auto shutdown plus feature. it differs from our existing auto on-line ? by relying on signal transitions rather than voltage levels to trigger shutdown and wakeup. auto on-line ? plus automatically puts the device into a standby mode where it draws only 1a typical. when the device detects activity on either the receiver or driver in - puts it will automatically awake and activate to allow serial communication. both the wakeup and shutdown happen automati - cally, without any user intervention, special drivers, or software modi?cations. wakeup and shutdown can be exter - nally controlled by the online and shutdown pins. when online is driv - en to logic low, the auto on-line ? plus function is active. driving shutdown to +0.3v r_in -0.3v 30s timer status invalid asserted if all receiver inputs are between +0.3v and -0.3v for at least 30s t_in r_in edg e detect edg e detect shutdow n s a online 30s timer figure 3a.status functional diagram status low figure 3c. auto on-line ? plus logic +2.7v r_in -2.7v 30s timer status invalid deasserted if all receiver inputs are between +2.7v and -2.7v for at least 30s figure 3b. status functional diagram, status high. shutdow n online auto online powerdow n powerdown is only a internal signal. it controls the operational status to the transmitters and the power supplies. figure 3d. powerdown logic auto online logic low forces the device into shutdown state regardless of input activity or the sta - tus of the online pin. the status output determines whether a valid rs-232 signal voltage is present on the inputs. the status pin goes to a logic low when the receiver input signal levels collapse near reference ground. this may occur when the rs-232 cable is discon - nected or the rs-232 drivers of the con - nected peripheral are turned off. status may be used to indicate dtr or a ring indicator signal or to determine wheth - er a live rs232 driver or cable is connect - ed. by connecting the status output to online input, the sp3224e-sp3227e will shut down when no valid signal level and no input transitions are detected, and wake up on a valid signal level or signal edge. if it detects no signal transitions with the past 30 seconds, the device will go into low power mode. by connecting the status output to both the online input and shutdown input pins, the device enters into shutdown when not receiving a valid rs-232 signal voltage input. when the sp3224e-sp3227e devices are theory of operation li f e s i gn i f i ca n tl y . r e c e i v e r 5 k ?
15 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation auto on-line (existing) device enters low-power mode if receiver inputs see less than valid +/- 3v . status (or invalid ) signal output indicates if valid signal voltage is at receivers. auto on-line plus (new) device enters low-power mode if driver inputs or receiver inputs see no transitions for 30 seconds. return to full power mode upon any transition on any driver input or receiver input shutdown occurs even if data cable is connected to an active driver , as long as all inputs remain unchanged status (or invalid ) signal functions as before. indicates if valid signal voltage is present. but has no effect on shutdown for sp3224e the en input is replaced with a ready output. ready drives high when charge pump achieves greater than -4v vss (v-). indicates ready to transmit. shut down, the charge pumps are turned off. v+ charge pump output decays to vcc,the v- output decays to gnd. the decay time will depend on the size of capacitors used for the charge pump. once in shutdown, the time required to exit the shutdown state and have valid v+ and v- levels is typically 50s. when the sp3224e-sp3227e drivers and internal charge pump are disabled, the sup - ply current is reduced to 1a. operating mode online shdn |r in | > 2.7v idle inputs (rx in & tx in ) tx out rx out forced shutdown x 0 x x hi-z active forced on-line 1 1 x x active active auto on-line plus (wake when active) 0 1 x active active active auto on line plus (off-line when idle) 0 1 x idle > 30s hi-z active auto on-line plus (wake on cable) status 1 yes x active active auto on-line plus (wake when active) status 1 no active active active auto on-line plus (off-line when idle) status 1 no idle > 30s hi-z active auto on-line (wake on cable) status status yes x active active auto on-line (auto shutoff) status status no x hi-z active auto on-line ? plus truth table theory of operation comparison of auto on-line ? features
16 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation theory of operation receiver inputs invalid region } transmitter inputs transmitter outputs status output output vcc 0 vcc 0 v+ vcc 0 v- t tstl t sth t offline t online t offline t online auto on-line ? plus timing diagram t stl (=30 s typ.) t sth (=0.4 s typ.) t offline (=30 s typ.) t online (=100 s typ.)
17 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation typical operating circuit +3.3v c5 0.1uf 2 c1+ c1 0.1uf 4 c2 5 6 0.1uf c1- c2+ c2- t 1 in 13 12 t 2 in ttl/cmos inputs 15 r 1 out 10 r 2 out ttl/cmos outputs 1 ready 14 online 18 gnd shutdown 20 v cc status 11 5k ? r 2 in 9 5k ? rs-232 inputs r 1 in 16 t 2 out t 1 out 8 17 rs-232 outputs c4 0.1uf c3 0.1uf 7 3 v+ v- vcc 19 sp3224e sp3225e +3.3v c5 0.1uf 2 4 c1 0.1uf 5 6 c2 0.1uf 11 9 1 ready 12 online 14 gnd shutdown status 16 10 v cc 5k? r 1 in 8 t 1 out 13 v- 7 c4 0.1uf v+ 3 c3 0.1uf vcc 15 r 1 out t 1 in c2- c2+ c1- c1+ sp3226e sp3227e ttl/cmos input/output rs-232 output + input
18 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation pinout diagrams sp3224e sp3225e 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 ready c1+ v+ c1- c2+ c2- v- t 2 out r 2 in r 2 out shutdow n v cc gnd t 1 out r 1 in r 1 out 14 13 12 11 online t 1 in t 2 in status sp3226e sp3227e 1 2 3 4 5 6 7 8 ready c1+ v+ c1- c2+ c2- v- r 1 in 16 15 shutdow n vcc gnd t1out r1out 14 13 12 11 online t1in status 10 9 s o l v e d b y t m s o l v e d b y t m
19 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation
20 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation
21 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation
22 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation
23 rev p 11/20/06 sp3224e-sp3227e transceivers with auto on-line ? plus ? 2006 sipex corporation 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. sipex corporation headquarters and sales of?ce 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 ordering information part number temperature range package type SP3224ECA-L from 0 c to +70 c lead free 20 pin ssop sp3224ecy-l from 0 c to +70 c lead free 20 pin tssop sp3224eea-l from -40 c to +85 c lead free 20 pin ssop sp3224eey-l from -40 c to +85 c lead free 20 pin tssop sp3225eca-l from 0 c to +70 c lead free 20 pin ssop sp3225ecy-l from 0 c to +70 c lead free 20 pin tssop sp3225eea-l from -40 c to +85 c lead free 20 pin ssop sp3225eey-l from -40 c to +85 c lead free 20 pin tssop sp3226eca-l from 0 c to +70 c lead free 16 pin ssop sp3226ecy-l from 0 c to +70 c lead free 16 pin ssop sp3226eea-l from -40 c to +85 c lead free 16 pin ssop sp3226eey-l from -40 c to +85 c lead free 16 pin tssop sp3227eca-l from 0 c to +70 c lead free 16 pin ssop sp3227ecy-l from 0 c to +70 c lead free 16 pin tssop sp3227eea-l from -40 c to +85 c lead free 16 pin ssop sp3227eey-l from -40 c to +85 c lead free 16 pin tssop available in tape on reel

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