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2801234fe ltc2801/ltc2802/ ltc2803/ltc2804 product selection guide 1.8v to 5.5v rs-232 single and dual transceivers t y p ical app lication feature s app lication s d e s cri p tion the ltc ? 2801/ltc2802/ltc2803/ltc2804 are single and dual rs-232 transceivers in narrow ssop and chip-scale dfn packages. all operate over a supply range of 1.8v to 5.5v, which permits operation directly from two alkaline, nicd or nimh cells. an integrated dc-to-dc converter generates power supplies for driving rs-232 levels. a logic supply pin allows easy interfacing with different logic levels independent of the dc-dc supply. these parts are compatible with the tia/eia-232-f stan- dard. driver outputs are protected from overload and can be shorted to ground or up to 15v without damage. to extend battery life, receivers can be kept active, operating at reduced speed, with only 15a current. in shutdown mode, current is further reduced to 1a. n 1.8v to 5.5v supply voltage n single and dual transceivers n high-speed operation 1mbps for 250pf/3k load (ltc2802, l tc2804) 250kbps for 1nf/3k load 100kbps for 2.5nf/3k tia/eia-232-f load n low-power 1a shutdown and 15a receivers- active modes n no damage or latchup to 10kv esd on rs-232 interface n logic supply pin for easy level-shifting to uart or microprocessor n low-latency output enable allows line sharing and half-duplex operation n true rs-232 compliant output levels n small footprint: ltc2801/l tc2802 4mm 3mm dfn package l tc2803/l tc2804 narrow ssop-16 and 5mm 3mm dfn packages n battery-powered systems n computers and consumer electronics n diagnostic ports ltc2802 at 1.8v and 1mbps tin tout rout 2v/div 5v/div 2v/div 400ns/div v cc = v l = 1.8v wrapping data tout load = 250pf + rin rout load = 150pf 2801 ta01b v cc v l ps mode tin rout gnd sw cap tout rin v ee ltc2802 2801 ta01a l1 10h c2 1f c3 1f c1 220nf 1.8v to 5.5v off on v dd c4 1f l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. part number drivers and receivers maximum data rate modes* package ltc2801 1 + 1 0.25mbps sd, ra, dd, ao dfn-12 ltc2802 1 + 1 1mbps sd, ra, dd, ao dfn-12 ltc2803 2 + 2 0.25mbps sd, ra, dd, ao dfn-16 ltc2803-1 2 + 2 0.25mbps sd, ao ssop-16 ltc2804 2 + 2 1mbps sd, ra, dd, ao dfn-16 ltc2804-1 2 + 2 1mbps sd, ao ssop-16 *sd = shutdown, ra = receiver active (low power), dd = drivers disabled, ao = all on
ltc2801/ltc2802/ ltc2803/ltc2804 2801234fe a b s olute maxi m u m r atin gs (note 1) input supplies v cc ...........................................................C 0.3v to 7v v l ......................................................... C 0.3v to 6.7v generated supplies v dd .................................................v cc C 0.3v to 7.5v v ee ........................................................ 0.3v to C 7.5v v dd C v ee .............................................................. 14v sw .................................................. C 0.3v to v dd + 0.3v cap .................................................. +0.3v to v ee C 0.3v tin, t1in, t2in, mode ................................C 0.3v to 7v ps, on/ off .....................................C 0.3v to (v l + 0.3v) rin, r1in, r2in ..........................................C 25v to 25v tout, t1out, t2out.................................. C 15v to 15v rout, r1out, r2out ....................C 0.3v to (v l + 0.3v) operating temperature l t c280xc ................................................0 c to 70 c l t c280xi .............................................C 40 c to 85 c storage temperature range .................. C 65 c to 125 c lead temperature (soldering, 10 sec) gn package ...................................................... 300c ltc2801, ltc2802 1-driver/1-receiver ltc2803, ltc2804 2-driver/2-receiver ltc2803-1, ltc2804-1 2-driver/2-receiver 12 11 10 9 8 7 13 1 2 3 4 5 6 rout tin v l mode ps cap rin tout v cc v dd sw gnd top view de package 12-lead (4mm s 3mm) plastic dfn v ee t jmax = 125c, ja = 43c/w, jc = 4.3c/w (4 layer) exposed pad (pin 13) is v ee , must be soldered to pcb 16 15 14 13 12 11 10 9 17 1 2 3 4 5 6 7 8 r1out r2out t1in t2in v l mode ps cap r1in r2in t1out t2out v cc v dd sw gnd top view dhc package 16-lead (5mm s 3mm) plastic dfn v ee t jmax = 125c, ja = 44c/w, jc = 4.3c/w (4 layer) exposed pad (pin 17) is v ee , must be soldered to pcb gn package 16-lead (narrow 0.150) plastic ssop 1 2 3 4 5 6 7 8 top view 16 15 14 13 12 11 10 9 r1out r2out t1in t2in v l on/off cap v ee r1in r2in t1out t2out v cc v dd sw gnd t jmax = 125c, ja = 110c/w, jc = 40c/w (4 layer) pin c on f i g uration lead free finish tape and reel part marking* package description temperature range ltc2801cde#pbf ltc2801cde#trpbf 2801 12-lead (4mm 3mm) plastic dfn 0c to 70c ltc2801ide#pbf ltc2801ide#trpbf 2801 12-lead (4mm 3mm) plastic dfn C 40c to 85c ltc2802cde#pbf ltc2802cde#trpbf 2802 12-lead (4mm 3mm) plastic dfn 0c to 70c ltc2802ide#pbf ltc2802ide#trpbf 2802 12-lead (4mm 3mm) plastic dfn C 40c to 85c ltc2803cdhc#pbf ltc2803cdhc#trpbf 2803 16-lead (5mm 3mm) plastic dfn 0c to 70c ltc2803idhc#pbf ltc2803idhc#trpbf 2803 16-lead (5mm 3mm) plastic dfn C 40c to 85c ltc2804cdhc#pbf ltc2804cdhc#trpbf 2804 16-lead (5mm 3mm) plastic dfn 0c to 70c ltc2804idhc#pbf ltc2804idhc#trpbf 2804 16-lead (5mm 3mm) plastic dfn C 40c to 85c ltc2803cgn-1#pbf ltc2803cgn-1#trpbf 28031 16-lead (narrow 0.150) plastic ssop 0c to 70c ltc2803ign-1#pbf ltc2803ign-1#trpbf 2803i1 16-lead (narrow 0.150) plastic ssop C 40c to 85c ltc2804cgn-1#pbf ltc2804cgn-1#trpbf 28041 16-lead (narrow 0.150) plastic ssop 0c to 70c ltc2804ign-1#pbf ltc2804ign-1#trpbf 2804i1 16-lead (narrow 0.150) plastic ssop C 40c to 85c consult ltc marketing for parts specifed with wider operating temperature ranges. *the temperature grade is identifed by a label on the shipping container. consult ltc marketing for information on non-standard lead based fnish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifcations, go to: http://www.linear.com/tapeandreel/ o rder i n f or m ation
2801234fe ltc2801/ltc2802/ ltc2803/ltc2804 e lectrical c haracteri s tic s the l denotes the specifcations which apply over the full operating temperature range, otherwise specifcations are at t a = 25c, v cc = 1.8v to 5.5v, v l = 1.8v to 5.5v, normal mode. typical values are given for v cc = v l = 3.3v and t a = 25c, unless otherwise noted. symbol parameter conditions min typ max units power supplies i cc v cc supply current outputs unloaded normal mode (note 3) receivers active mode shutdown mode l l 2.3 1 1 10 10 ma a a i l v l supply current outputs unloaded normal mode (ltc2801, l tc2802) normal mode (l tc2803, l tc2804) receivers active mode shutdown mode l l l l 0.08 0.15 15 1 0.15 0.30 30 10 ma ma a a driver v old output voltage r l = 3k low l C5 C5.7 v v ohd output voltage r l = 3k high l 5 6.2 v v hysd logic input hysteresis 0.6 v i osd output short circuit current v l = v cc = 5.5v; v tout = 0v l 35 70 ma i pold power-off output leakage current v l = v cc = v dd = v ee = 0v; v tout = 2v l 0.1 10 a i old output leakage current shutdown or receivers active or drivers disabled modes, C15v v tout 15v l 0.1 10 a receiver v ir input thresholds receivers active mode l 0.8 1.5 2.4 v v ilr input thresholds normal mode, input low l 0.8 1.3 v v ihr input thresholds normal mode, input high l 1.7 2.5 v v hysr input hysteresis normal mode l 0.1 0.4 1.0 v v olr output voltage output low, i rout = 1ma (sinking) l 0.2 0.4 v v ohr output voltage output high, i rout = C 1ma (sourcing) l v l C 0.4 v l C 0.2 v r in input resistance C15v v rin 15v l 3 5 7 kw i osr output short circuit current v l = 5.5v; 0v v rout v l l 25 50 ma logic logic input voltage threshold l 0.4 0.67 ? v l v i in logic input current l 1 a power supply generator v dd regulated v dd output voltage driver r l = 3kw (note 3) ltc2801, ltc2802: v tin = v l ltc2803, ltc2804: v t1in = v l , v t2in = 0v 7 v v ee regulated v ee output voltage driver r l = 3kw (note 3) ltc2801, ltc2802: v tin = v l ltc2803, ltc2804: v t1in = v l , v t2in = 0v C 6.3 v
ltc2801/ltc2802/ ltc2803/ltc2804 2801234fe note 2: all currents into pins are positive; all voltages are referenced to gnd unless otherwise specifed. note 3: guaranteed by other measured parameters and not tested directly. note 4: time from ps or on/off until v dd 5v and v ee C5v. the l denotes the specifcations which apply over the full operating temperature range, otherwise specifcations are at t a = 25c, v cc = 1.8v to 5.5v, v l = 1.8v to 5.5v, normal mode. typical values are given for v cc = v l = 3.3v and t a = 25c, unless otherwise noted. note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. switchin g c haracteri s tic s symbol parameter conditions min typ max units maximum data rate ltc2801, ltc2803 (note 3) r l = 3kw, c l = 2.5nf r l = 3kw, c l = 1nf l l 100 250 kbps kbps ltc2802, ltc2804 (note 3) r l = 3kw, c l = 2.5nf r l = 3kw, c l = 1nf r l = 3kw, c l = 250pf l l l 100 250 1000 kbps kbps kbps driver sr(d) driver slew rate ltc2801, ltc2803 (figure 1) v cc = v l = 1.8v, r l = 3kw, c l = 2.5nf v cc = v l = 5.5v, r l = 3kw, c l = 50pf l l 4 30 v/s v/s ltc2802, ltc2804 (figure 1) v cc = v l = 1.8v, r l = 3kw, c l = 2.5nf v cc = v l = 5.5v, r l = 3kw, c l = 50pf l l 4 150 v/s v/s t phld , t plhd driver propagation delay r l = 3kw, c l = 50pf (figure 2) ltc2801, l tc2803 l tc2802, l tc2804 l l 1 0.2 2 0.5 s s t skewd driver skew r l = 3kw, c l = 50pf (figure 2) ltc2801, l tc2803 l tc2802, l tc2804 100 50 ns ns t pzhd , t pzld driver output enable time ps = v l , mode = , r l = 3kw, c l = 50pf (figure 4) l 0.6 2 s t phzd , t plzd driver output disable time ps = v l , mode = , r l = 3kw, c l = 50pf (figure 4) l 0.3 2 s receiver t phlr , t plhr receiver propagation delay c l = 150pf (figure 3) l 0.2 0.4 s t skewr receiver skew c l = 150pf (figure 3) 50 ns t rr , t fr receiver rise or fall time c l = 150pf (figure 3) l 60 200 ns t pzhr , t pzlr shutdown to receiver output enable ps = mode = or on/off = , r l = 1kw, c l = 150pf (figure 5) l 5 15 s t phzr , t plzr receiver output disable upon shutdown ps = mode = or on/off = , r l = 1kw, c l = 150pf (figure 5) l 0.15 0.3 s power supply generator v dd /v ee supply rise time (notes 3 and 4) l 0.2 2 ms
2801234fe ltc2801/ltc2802/ ltc2803/ltc2804 t pzld 0v 0v v old v ohd tout mode tout t pzhd 1/2 v l t plzd v old + 0.5v ?5v v ohd ? 0.5v 5v 2801 f04 v l mode r l c l tout 0 or v l 0v t phzd 1/2 v l mode t r , t f 40ns t thl v ohd v old tout tin t tlh ?3v 3v ?3v 3v 2801 f01 v l tin tin t r , t f 40ns r l c l tout 0v sr(d) = 6v t thl or t tlh figure 1. driver slew rate measurement t phlr v ohr v olr rout t skewr = |t phlr ? t plhr | rin 1.5v 1/2 v l t plhr 1/2 v l 2801 f03 3v rin c l rout ?3v 1.5v rin t r , t f 40ns figure 3. receiver timing measurement t phld v ohd v old tout t skewd = |t phld ? t plhd | tin 1/2 v l 0v t plhd 0v 2801 f02 v l tin r l c l tout 0v 1/2 v l tin t r , t f 40ns figure 2. driver timing measurement figure 4. driver enable/disable times t e s t c ircuit s
ltc2801/ltc2802/ ltc2803/ltc2804 2801234fe t y p ical per f or m ance c haracteri s tic s ltc2803 at 1.8v and 250kbps ltc2804 at 1.8v and 1mbps drivers disabled mode supply current vs supply voltage t pzlr v l 0v v olr v ohr rout ps and mode gnd v l rout t pzhr 1/2 v l t plzr 1/2 v l 1/2 v l 2801 f05 v l ps and mode r l c l rout ?3v or 3v 0v t phzr 1/2 v l v olr + 0.5v v ohr ? 0.5v ps and mode t r , t f 40ns figure 5. receiver enable/disable times supply current vs supply voltage (dual transceiver) supply current vs data rate supply current vs load capacitance (dual transceiver) t a = 25c, v cc = v l = 3.3v unless otherwise noted. t e s t c ircuit s 2801 g01 t1in t2out t1out r2out r1out 2v/div 10v/div 2v/div 2s/div v cc = v l = 1.8v wrapping data tout load = 1nf + rin rout load = 150pf 2801 g02 t1in t2out t1out r2out r1out 2v/div 10v/div 2v/div 400ns/div v cc = v l = 1.8v wrapping data tout load = 250pf + rin rout load = 150pf supply voltage (v) 6 supply current (ma) 3.0 2.5 2.0 1.5 1.0 0.5 0 1 2 3 4 2801 g03 5 v cc = v l t a = 85c t a = 25c t a = ?40c ltc2804 ltc2803 all drivers switching v cc = v l r l = 3k c l = 1nf 250kbps 20.8kbps 125kbps supply voltage (v) 1 supply current (ma) 60 50 40 30 20 10 0 2 3 4 5 2801 g04 6 data rate (kbps) 0 supply current (ma) 100 80 60 40 20 0 800 2801 g05 200 400 600 1000 all drivers switching v cc = v l = 1.8v r l = 3k ltc2804 ltc2802 1nf 1nf 250pf 250pf 250kbps 100 80 60 40 20 0 load capacitance (nf) 1 5 2801 g06 2 3 4 ltc2804 ltc2803 125kbps v cc = v l = 1.8v r l = 3k all drivers switching 20.8kbps supply current (ma)
2801234fe ltc2801/ltc2802/ ltc2803/ltc2804 t y p ical per f or m ance c haracteri s tic s receiver input threshold vs temperature receiver output voltage vs load current receiver output duty cycle driver slew rate vs load capacitance driver short-circuit current vs temperature shutdown or drivers disabled mode driver leakage vs temperature logic input threshold vs v l supply voltage ltc2804 driver outputs exiting shutdown ltc2804 driver outputs enable/disable t a = 25c, v cc = v l = 3.3v unless otherwise noted. temperature (c) ?50 threshold voltage (v) 3.0 2.5 2.0 1.5 1.0 0.5 0 25 75 2801 go7 ?25 0 50 100 125 input high input low v l = 5.5v v l = 3.3v v l = 1.8v load current (ma) output voltage (v) 2801 go8 6 5 4 3 2 1 0 0 2 4 5 1 3 6 7 8 v l = 5.5v v l = 3.3v v l = 1.8v v l = 5.5v v l = 3.3v v l = 1.8v receivers alive mode normal mode r in = 3v c l = 150pf 10 positive duty cycle (%) 100 80 60 40 20 0 100 1000 10000 2801 go9 data rate (kbps) load capacitance (nf) 0 slew rate (v/s) 3 5 2801 g10 1 2 4 80 70 60 50 40 30 20 10 0 falling (ltc2802/04) rising (ltc2802/04) falling (ltc2801/03) rising (ltc2801/03) temperature (c) ?50 short-circuit current (ma) 60 50 40 30 20 10 0 25 75 2801 g11 ?25 0 50 100 125 sinking sourcing regulator can limit further v l supply voltage (v) 1 threshold voltage (v) 3.0 2.5 2.0 1.5 1.0 0.5 0 2 3 4 5 2801 g13 6 input high input low t a = 85c t a = 25c t a = ?40c leakage current (a) 10 ?6 10 ?7 10 ?8 10 ?9 10 ?10 10 ?11 2801 g12 v(tout) = 15v or v(tout) = ?15v temperature (c) ?50 25 75 ?25 0 50 100 125 2v/div 5v/div t2out t1out mode and ps v cc = 3.3v v l = 1.8v load = 3k + 2.5nf 100s/div 2801 g14 2v/div 5v/div t2out t1out mode v cc = 3.3v v l = 1.8v load = 3k + 250pf 2s/div 2801 g15
ltc2801/ltc2802/ ltc2803/ltc2804 2801234fe pin function s mode c ontrol pin name pin number comments 2801 2802 2803 2804 2803-1 2804-1 v cc 3 5 5 input supply (1.8v-5.5v). bypass to gnd with a 1f capacitor. v dd 4 6 6 generated positive supply voltage for rs-232 driver (7v). connect a 1f capacitor between v dd and gnd. v ee 13* 17* 9 generated negative supply voltage for rs-232 driver (C 6.3v). connect a 1f capacitor between v ee and gnd. sw 5 7 7 switch pin. connect a 10h inductor between sw and v cc . gnd 6 8 8 ground. cap 7 9 10 charge pump capacitor for generated negative supply voltage. connect a 220nf capacitor between cap and sw. v l 10 12 12 logic supply (1.8v-5.5v) for the receiver outputs, driver inputs, and control inputs. this pin should be bypassed to gnd with a 220nf capacitor if its not tied to v cc . tin (t1in, t2in) 11 14, 13 14, 13 driver input(s), referenced to v l . tout (t1out, t2out) 2 3, 4 3, 4 rs-232 driver output(s). rin (r1in, r2in) 1 1, 2 1, 2 rs-232 receiver input(s). includes internal 5k termination resistor(s). rout (r1out, r2out) 12 16, 15 16, 15 receiver output(s), referenced to v l . output is short-circuit protected to gnd/v cc /v l , and is high impedance in shutdown mode, allowing data line sharing. ps 8 10 power supply control pin, referenced to v l . enables the integrated dc-dc converter. mode 9 11 mode control pin, referenced to v l . see table 1 for functionality. on/off 11 transceiver enable pin, referenced to v l . a logic low puts the device in shutdown mode and places both driver and receiver outputs in a high impedance state. *backside thermal pad table 1. ltc2801, ltc2802, ltc2803, ltc2804 mode name ps mode receiver output(s) dc-dc driver output(s) i vcc * i vl * shutdown l l hi-z off hi-z 1a 1a receiver(s) active l h on off hi-z 1a 15a driver(s) disabled h l on on hi-z 2.1ma 80a or 150a normal h h on on on 2.3ma 80a or 150a table 2. ltc2803-1, ltc2804-1 mode name on/off receiver outputs dc-dc driver outputs i vcc * i vl * shutdown l hi-z off hi-z 1a 1a normal h on on on 2.3ma 150a *typical currents for static drivers. normal mode currents are for unloaded outputs.
2801234fe ltc2801/ltc2802/ ltc2803/ltc2804 b lock d ia g ra m 5k 5k gnd gnd v l v dd v l v l v ee gnd control boost regulator v ee t2out t1out r2in r1in v dd c3 1f c2 1f ** ** ** ltc2803 ltc2804 ltc2803-1 ltc2804-1 ltc2801 ltc2802 ltc2803 ltc2804 ltc2803-1 ltc2804-1 ** ** cap sw c1 220nf l1 10h v cc c4 1f c5 220nf t2in t1in r2out r1out ps mode on/off v l 1.8v to 5.5v 1.8v to 5.5v 2801 bd feature 2801 2802 2803 2803-1 2804 2804-1 drivers and receivers 1 + 1 1 + 1 2 + 2 2 + 2 2 + 2 2 + 2 package dfn-12 dfn-12 dfn-16 ssop-16 dfn-16 ssop-16 1.8v - 5.5v operation l l l l l l 1.8v - 5.5v logic supply (v l ) l l l l l l shutdown (1a) l l l l l l receiver(s) active (15a) l l l l driver(s) disable l l l l 100kb/s for r l = 3k, c l = 2.5nf l l l l l l 250kb/s for r l = 3k, c l = 1nf l l l l l l 1mb/s for r l = 3k, c l = 250pf l l l feature su mm ary
ltc2801/ltc2802/ ltc2803/ltc2804 0 2801234fe boost regulator v ee v dd c3 1f c2 1f cap sw c1 220nf l1 10h v cc c4 1f c5 220nf *omit if v l is connected to v cc * v l 1.8v to 5.5v 1.8v to 5.5v 2801 f06 app lication s i n f or m ation overview the ltc2801 family of rs-232 transceivers operates on a v cc supply of 1.8v to 5.5v, utilizing a switching regula- tor to generate the necessary higher voltage rails for the drivers. the transceivers interface with logic operating on any supply from 1.8v to 5.5v, independent of the v cc voltage. depending on the device, one or two control pins are available to invoke shutdown, receiver active and driver disable features. dc-dc converter the on-chip dc-dc converter operates from the v cc input, generating a 7v v dd supply and a charge pumped C 6.3v v ee supply, as shown in figure 6. v dd and v ee power the output stage of the drivers and are regulated to levels that guarantee greater than 5v output swing. the dc-dc converter requires a 10h inductor (l1) and a bypass capacitor (c4) of at least 1f. the recommended size for the charge pump capacitor (c1) is 220nf and for the storage capacitors (c2 and c3) is 1f. larger storage capacitors up to 4.7f may be used if c1 is kept at 20% to 50% their size and c4 is also scaled. locate c1-c4 close to their associated pins. power-saving modes when the dc-dc converter and drivers are turned off (ps and mode or on/ off = logic low), v cc supply current is reduced to 1a. tables 1 and 2 summarize the modes for each device. in shutdown mode, v l supply current is reduced to 1a, and both receiver and driver outputs assume a high im- pedance state. in receivers active mode, the quiescent v l supply current is reduced to 15a and the driver outputs assume a high impedance state. the receivers operate at a reduced rate (typically 100 kbps) with hysteresis turned off. half-duplex operation when the dc-dc converter is kept on (ps = logic high), mode serves as a low-latency driver enable for half-duplex operation. each driver is enabled and disabled in less than 2s, while each receiver remains continuously active. this mode of operation is illustrated in figures 15-17. battery operation to maximize battery life, connect v cc (and l1) directly to the unregulated battery voltage and v l to the regulated supply, as shown in figure 22. this confguration typically minimizes conversion loss while providing compatibility with system logic levels. inductor selection a 10h inductor with a saturation current (i sat ) rating of at least 200ma and low dcr (copper wire resistance) is recommended. some small inductors meeting these requirements are listed in table 3. figure 6. dc/dc converter and recommended bypassing v l logic supply a separate logic supply pin v l allows the ltc2801 family to interface with any logic signal from 1.8v to 5.5v, as shown in figure 7. simply connect the desired logic supply to v l . there is no interdependency between v cc and v l ; they may simultaneously operate at any voltage from 1.8v to 5.5v and sequence in any order. if v l is powered separately from v cc , bypass v l with a 220nf capacitor (c5). figure 7. v cc and v l are independent any voltage from 1.8v to 5.5v any voltage from 1.8v to 5.5v v l v cc external device rs-232 2801 f07
2801234fe ltc2801/ltc2802/ ltc2803/ltc2804 table 3. recommended inductors part number i sat (ma) max dcr () size (mm) manufacturer lqh2mcn100k02l 225 1.2 2 1.6 0.95 murata www.murata.com lbc2016t100k 245 0.85 2 1.6 1.6 taiyo yuden www.t-yuden.com fslb2520-100k 220 1.1 2.5 2 1.6 toko www.tokoam.com capacitor selection the small size of ceramic capacitors makes them ideal for the ltc2801 family. x5r and x7r (preferred) types are recommended because their esr is low and they retain their capacitance over relatively wide voltage and temperature ranges. use a voltage rating of at least 10v. table 4. recommended ceramic capacitor manufacturers manufacturer url murata www.murata.com tdk www.tdk.com taiyo yuden www.t-yuden.com avx www.avxcorp.com kemet www.kemet.com inrush current and supply overshoot precaution in certain applications, such as battery-operated and wall-adapter devices, fast supply slew rates are generated when power is connected. if v cc s voltage is greater than 4.5v and its rise time is faster than 10s, the pins v dd and sw can exceed their abs max values during start- up. when supply voltage is applied to v cc , the voltage difference between v cc and v dd generates inrush current v l v l v cc v cc gnd gnd gnd gnd gnd gnd gnd gnd gnd gnd c1 c1 c5 c5 c3 c3 top view = via top view = via c4 c4 c2 c2 l1 l1 2801 f09 sw cap v dd gnd scale r1 with c1, c2, 1/c4 c1 220nf l1 10h 4.5v to 5.5v v cc r1 1 1/8w c4 1f c2 1f inrush current 2801 f08 app lication s i n f or m ation fowing through inductor l1 and capacitors c1, c2. the peak inrush current must not exceed 2a. to avoid this condition, add a 1 resistor as shown in figure 8. this precaution is not relevant for supply voltages below 4.5v or rise times longer than 10s. board layout the board layout should minimize the length and area of the sw and cap traces. suggested compact layouts for the ltc2801 family are shown in figure 9 (a) and (b). figure 9. recommended board layouts for (a) single and (b) dual transceiver parts figure 8. supply overshoot protection for input supplies of 4.5v or higher
ltc2801/ltc2802/ ltc2803/ltc2804 2801234fe 2801 f17 ltc2803 r t 1.8v to 5.5v v cc v l ps mode 5 12 10 11 13 15 14 16 t2out r2in t1out r1in t2in r2out t1in r1out 4 2 3 1 8 gnd 3.3k 3.3k 2801 f16 ltc2802 r t v cc v l ps mode 3 10 8 9 11 12 tout rin tin rout 2 1 6 gnd 3.3k 1.8v to 5.5v 2801 f15 ltc2802 r t v cc v l ps mode 3 10 8 9 11 12 tout rin tin rout 2 1 6 gnd 1.8v to 5.5v 2801 f14 ltc2804-1 off on 1.8v to 5.5v v cc v l on/off 5 12 11 13 14 15 16 t2out t1out r2in r1in t2in t1in r2out r1out 4 3 2 1 8 gnd 2801 f13 ltc2802 v cc v l ps mode 3 10 8 9 11 12 tout rin tin rout 2 1 6 gnd 5v p 3v 2801 f12 ltc2801 v cc v l ps mode 3 10 8 9 11 12 tout rin tin rout 2 1 6 gnd 1.8v p 5v 2801 f11 ltc2804 v cc v l ps mode 5 12 10 11 13 14 15 16 t2out t1out r2in r1in t2in t1in r2out r1out 4 3 2 1 rts td cts rd v batt rts td cts rd 8 gnd peripheral cell phone 1.8v to 5.5v t y p ical app lication s 2801 f10 ltc2803 ra on 1.8v to 5.5v v cc v l mode ps 5 12 11 10 13 14 15 16 t2out t1out r2in r1in t2in t1in r2out r1out 4 3 2 1 8 gnd figure 16. half-duplex on single line figure 15. half-duplex on single line, separate rout, tin figure 14. power-saving shutdown mode figure 13. 5v microprocessor interface figure 12. 1.8v microprocessor interface figure 11. cellphone peripheral interface figure 10. power-saving receivers-active mode figure 17. half-duplex dual transceiver
2801234fe ltc2801/ltc2802/ ltc2803/ltc2804 v cc = 5.5v drivers disabled v cc = 5.5v drivers loaded v cc = 1.8v drivers disabled v cc = 1.8v drivers loaded v sw 5v/div 200ns/div 2801 f21 2801 f20 ltc2803 off on c5 220nf 3v to 25v ?25v to 0v notes: 1. no l1 or c2-c4 needed. 2. receivers active mode shown has no dc hysteresis. 3. see duty cycle graph in typical performance section. 1.8v to 5.5v r2in r2in mode v cc sw r2out r1out 15 16 10 13 14 68 17 12 gnd ps t2in t1in v ee v dd 2 1 11 5 7 v l v l 0v 2801 f19 ltc2803 ltc2803 l1 10h v cc v l 5 12 13 14 15 16 t2out t1out r2in r1in t2in t1in r2out r1out 4 3 2 1 6 v dd 2.5v to 5.5v v cc v l c1 470nf c4 2f c2 2f c3 2f sw cap sw cap 5 12 13 14 15 16 t2out t1out r2in r1in t2in t1in r2out r1out 4 3 2 1 7 9 7 9 6 v dd 8 gnd 8 gnd 17 v ee 17 v ee any combination ltc2801/ltc2802/ltc2803/ltc2804 2801 f18 3k c l c l (nf) 5 2 0.5 ltc2803 x x ltc2804 x x x data rate (kbps) 100 250 1000 13 14 4 3 t y p ical app lication s figure 18. driving larger loads figure 19. quad transceiver (2.5v < v cc < 5.5v) figure 21. typical sw pin waveforms figure 20. 100kbps dual inverting level translator (i l = 15a static)
ltc2801/ltc2802/ ltc2803/ltc2804 2801234fe de/ue package 12-lead plastic dfn (4mm 3mm) (reference ltc dwg # 05-08-1695 rev d) packa g e d e s cri p tion 4.00 p0.10 (2 sides) 3.00 p0.10 (2 sides) note: 1. drawing proposed to be a variation of version (wged) in jedec package outline m0-229 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package 0.40 p 0.10 bottom view?exposed pad 1.70 p 0.10 0.75 p0.05 r = 0.115 typ r = 0.05 typ 2.50 ref 1 6 12 7 pin 1 notch r = 0.20 or 0.35 s 45o chamfer pin 1 top mark (note 6) 0.200 ref 0.00 ? 0.05 (ue12/de12) dfn 0806 rev d 2.50 ref recommended solder pad pitch and dimensions apply solder mask to areas that are not soldered 2.20 p0.05 0.70 p0.05 3.60 p0.05 package outline 3.30 p0.10 0.25 p 0.05 0.50 bsc 1.70 p 0.05 3.30 p0.05 0.50 bsc 0.25 p 0.05
2801234fe ltc2801/ltc2802/ ltc2803/ltc2804 packa g e d e s cri p tion dhc package 16-lead plastic dfn (5mm 3mm) (reference ltc dwg # 05-08-1706) 3.00 0.10 (2 sides) 5.00 0.10 (2 sides) note: 1. drawing proposed to be made variation of version (wjed-1) in jedec package outline mo-229 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package 0.40 0.10 bottom viewexposed pad 1.65 0.10 (2 sides) 0.75 0.05 r = 0.115 typ r = 0.20 typ 4.40 0.10 (2 sides) 1 8 16 9 pin 1 top mark (see note 6) 0.200 ref 0.00 C 0.05 (dhc16) dfn 1103 0.25 0.05 pin 1 notch 0.50 bsc 4.40 0.05 (2 sides) recommended solder pad pitch and dimensions 1.65 0.05 (2 sides) 2.20 0.05 0.50 bsc 0.65 0.05 3.50 0.05 package outline 0.25 0.05
ltc2801/ltc2802/ ltc2803/ltc2804 2801234fe packa g e d e s cri p tion gn16 (ssop) 0204 1 2 3 4 5 6 7 8 .229 C .244 (5.817 C 6.198) .150 C .157** (3.810 C 3.988) 16 15 14 13 .189 C .196* (4.801 C 4.978) 12 11 10 9 .016 C .050 (0.406 C 1.270) .015 .004 (0.38 0.10) 45 0 C 8 typ .007 C .0098 (0.178 C 0.249) .0532 C .0688 (1.35 C 1.75) .008 C .012 (0.203 C 0.305) typ .004 C .0098 (0.102 C 0.249) .0250 (0.635) bsc .009 (0.229) ref .254 min recommended solder pad layout .150 C .165 .0250 bsc .0165 .0015 .045 .005 *dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side **dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side inches (millimeters) note: 1. controlling dimension: inches 2. dimensions are in 3. drawing not to scale gn package 16-lead plastic ssop (narrow .150 inch) (reference ltc dwg # 05-08-1641)
2801234fe ltc2801/ltc2802/ ltc2803/ltc2804 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. r evi s ion h i s tory rev date description page number e 5/10 replaced product selection guide labeled packages with appropriate part numbers in pin confguration section changed title of table 1 in mode control section updated feature summary section revised frst sentence of power saving modes section 1 2 8 9 10 (revision history begins at rev e)
ltc2801/ltc2802/ ltc2803/ltc2804 2801234fe linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax : (408) 434-0507 l www.linear.com ? linear technology corporation 2005 lt 0510 rev e ? printed in usa 2801 f22 ltc2804 + ? v cc v l ps mode 10 11 13 14 15 16 4 3 2 1 5 12 t2out t1out r2in r1in t2in t1in r2out r1out cts rx rts tx pp x pp y txd pp z rxd 68 7 9 v dd sw cap v ee gnd uart *additional bypass capacitor as needed p v cc 1.8v to 5.5v 1.8v to 5.5v dc-dc c2 1f c5 220nf c4 1f * * 17 c3 1f c1 220nf l1 10h t y p ical app lication figure 22. diagnostic port operating directly off unregulated battery voltage part number description comments lt1780/lt1781 2-driver/2-receiver rs232 transceiver single 5v supply with 0.1f capacitors, 15kv esd ltc1337 3-driver/5-receiver rs232 transceiver ultralow power for dte applications ltc1338 5-driver/3-receiver rs232 transceiver ultralow power for dce applications lt1039/lt1039-16 3-driver/3-receiver rs232 transceiver 30k input impedance for multidrop applications ltc1348 3-driver/5-receiver rs232 transceiver true rs232 levels on 3.3v supply r elated part s

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