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1 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 features descriptio u typical applicatio u applicatio s u product selectio guide u 1.8v to 5.5v rs-232 single and dual transceivers 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 15 a current. in shutdown mode, current is further reduced to 1 a. line sharing and half-duplex operation are also supported. , ltc and lt are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. ltc2802 at 1.8v and 1mbps part number drivers receivers package ltc2801 1 1 12-lead dfn ltc2802 1 1 12-lead dfn ltc2803 2 2 16-lead dfn ltc2803-1 2 2 16-lead ssop LTC2804 2 2 16-lead dfn LTC2804-1 2 2 16-lead ssop 1.8v to 5.5v supply voltage single and dual transceivers high-speed operation 1mbps for 250pf/3k load (ltc2802, LTC2804) 250kbps for 1nf/3k load 100kbps for 2.5nf/3k tia/eia-232-f load low-power 1 a shutdown and 15 a receivers- active modes no damage or latch-up to 10kv esd on rs-232 interface logic supply pin for easy level-shifting to uart or microprocessor low-latency output enable allows line sharing and half-duplex operation true rs-232 compliant output levels small footprint: ltc2801/ltc2802 4mm 3mm dfn package ltc2803/LTC2804 narrow ssop-16 and 5mm 3mm dfn packages battery-powered systems computers and consumer electronics diagnostic ports 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 10 h c2 1 f c3 1 f c1 220nf 1.8v to 5.5v off on v dd c4 1 f 4 .com u datasheet
2 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 absolute axi u rati gs w ww u for atio package/order i uu w order part number de part* marking t jmax = 125c, ja = 43c/w, jc = 4.3c/w (4 layer) consult ltc marketing for parts speci? ed with wider operating temperature ranges. *the temperature grade is identi? ed by a label on the shipping container. ltc2801cde ltc2801ide ltc2802cde ltc2802ide (note 1) 1 2 3 4 5 6 12 11 10 9 8 7 rout tin v l mode ps cap rin tout v cc v dd sw gnd top view de package 12-lead (4mm 3mm) plastic dfn exposed pad is v ee (pin 13) must be soldered to pcb 13 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 3mm) plastic dfn exposed pad is v ee (pin 17) must be soldered to pcb top view gn package 16-lead plastic ssop 1 2 3 4 5 6 7 8 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 order part number dhc part* marking order part number gn part marking ltc2803cdhc ltc2803idhc LTC2804cdhc LTC2804idhc ltc2803cgn-1 ltc2803ign-1 LTC2804cgn-1 LTC2804ign-1 28031 2803i1 28041 2804i1 2803 2803 2804 2804 2801 2801 2802 2802 t jmax = 125c, ja = 110c/w, jc = 40c/w (4 layer) 2-driver/2-receiver 2-driver/2-receiver 1-driver/1-receiver t jmax = 125c, ja = 44c/w, jc = 4.3c/w (4 layer) 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/ ? o ? f ? f .....................................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 ltc280xc ................................................ 0 c to 70 c ltc280xi .............................................C 40 c to 85 c storage temperature range ...................C 65 c to 125 c lead temperature (soldering, 10 sec) gn package ...................................................... 300c 4 .com u datasheet
3 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 electrical characteristics the denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations 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) 2.3 ma receivers active mode 1 10 a shutdown mode 1 10 a i l v l supply current outputs unloaded normal mode (ltc2801, ltc2802) 0.08 0.15 ma normal mode (ltc2803, LTC2804) 0.15 0.30 ma receivers active mode 15 30 a shutdown mode 1 10 a driver v old output voltage r l = 3k low C5 C5.7 v v ohd high 5 6.2 v v ild logic input voltage threshold low 0.4 v v ihd high 0.67 ? v l v v hysd logic input hysteresis 0.6 v i osd output short circuit current v l = v cc = 5.5v; v tout = 0v 35 70 ma i pold power-off output leakage current v l = v cc = v dd = v ee = 0v; v tout = 2v 0.1 10 a i old output leakage current shutdown or receivers active or 0.1 10 a drivers disabled modes , ?15v v tout 15v receiver v ir input thresholds receivers active mode 0.8 1.5 2.4 v v ilr normal mode, input low 0.8 1.3 v v ihr normal mode, input high 1.7 2.5 v v hysr input hysteresis normal mode 0.1 0.4 1.0 v v olr output voltage output low, i rout = 1ma (sinking) 0.2 0.4 v v ohr output high, i rout = C 1ma (sourcing) v l C 0.4 v l C 0.2 v r in input resistance C15v v rin 15v 3 5 7 k i osr output short circuit current v l = 5.5v; 0v v rout v l 25 50 ma power supply generator v dd regulated v dd output voltage driver r l = 3k (note 3) ltc2801, ltc2802: v tin = v l 7 v ltc2803, LTC2804: v t1in = v l , v t2in = 0v v ee regulated v ee output voltage driver r l = 3k (note 3) ltc2801, ltc2802: v tin = v l C6.3 v ltc2803, LTC2804: v t1in = v l , v t2in = 0v 4 .com u datasheet
4 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 note 3: guaranteed by other measured parameters and not tested directly. note 4: time from ps or on/ ? o ? f ? f until v dd 5v and v ee C5v. the denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations 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: absolute maximum ratings are those beyond which the life of a device may be impaired. note 2: all currents into pins are positive; all voltages are referenced to gnd unless otherwise speci? ed. symbol parameter conditions min typ max units maximum data rate ltc2801, ltc2803 (note 3) r l = 3k , c l = 2.5nf 100 kbps r l = 3k , c l = 1nf 250 kbps ltc2802, LTC2804 (note 3) r l = 3k , c l = 2.5nf 100 kbps r l = 3k , c l = 1nf 250 kbps r l = 3k , c l = 250pf 1000 kbps driver sr(d) driver slew rate ltc2801, ltc2803 (figure 1) v cc = v l = 1.8v, r l = 3k , c l = 2.5nf 4 v/ s v cc = v l = 5.5v, r l = 3k , c l = 50pf 30 v/ s ltc2802, LTC2804 (figure 1) v cc = v l = 1.8v, r l = 3k , c l = 2.5nf 4 v/ s v cc = v l = 5.5v, r l = 3k , c l = 50pf 150 v/ s t phld , t plhd driver propagation delay r l = 3k , c l = 50pf (figure 2) ltc2801, ltc2803 1 2 s ltc2802, LTC2804 0.2 0.5 s t skewd driver skew r l = 3k , c l = 50pf (figure 2) ltc2801, ltc2803 100 ns ltc2802, LTC2804 50 ns t pzhd , t pzld driver output enable time ps = v l , mode = , r l = 3k , c l = 50pf 0.6 2 s (figure 4) t phzd , t plzd driver output disable time ps = v l , mode = , r l = 3k , c l = 50pf 0.3 2 s (figure 4) receiver t phlr , t plhr receiver propagation delay c l = 150pf 0.2 0.4 s (figure 3) t skewr receiver skew c l = 150pf 50 ns (figure 3) t rr , t fr receiver rise or fall time c l = 150pf (figure 3) 60 200 ns t pzhr , t pzlr shutdown to receiver output enable ps = mode = or on/ ? o ? f ? f = , 5 15 s r l = 1k , c l = 150pf (figure 5) t phzr , t plzr receiver output disable upon shutdown ps = mode = or on/ ? o ? f ? f = , 0.15 0.3 s r l = 1k , c l = 150pf (figure 5) power supply generator v dd /v ee supply rise time (notes 3 and 4) 0.2 2 ms 4 .com u datasheet
5 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 test circuits t thl v ohd v old tout tin t tlh ?3v 3v ?3v 3v 2801f02 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 2801f03 3v rin c l rout ?3v 1.5v rin t r , t f 40ns figure 3. receiver timing measurement 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 2801f04 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 figure 4. driver enable/disable times t phld v ohd v old tout t skewd = | t phld ? t plhd | tin 1/2 v l 0v t plhd 0v 2801f02 v l tin r l c l tout 0v 1/2 v l tin t r , t f 40ns figure 2. driver timing measurement 4 .com u datasheet
6 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 test circuits typical perfor a ce characteristics uw 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 2801f05 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 voltage (v) 6 supply current (ma) 3.0 2.5 2.0 1.5 1.0 0.5 0 1234 2801 g03 2801 g02 2801 g01 5 v cc = v l t a = 85 c t a = 25 c t a = ? 40 c t1in t2out t1out r2out r1out 2v/div 10v/div 2v/div 2 s/div v cc = v l = 1.8v wrapping data tout load = 1nf + rin rout load = 150pf 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 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 2345 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) 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. 4 .com u datasheet
7 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 typical perfor uw ce characteristics a load current (ma) output voltage (v) 2801 go8 6 5 4 3 2 1 0 02 45 13 678 2v/div 5v/div 2v/div 5v/div 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 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 t2out t1out t2out t1out data rate (kbps) mode and ps mode v cc = 3.3v v l = 1.8v load = 3k ? + 2.5nf v cc = 3.3v v l = 1.8v load = 3k ? + 250nf 100 s/div 2 s/div load capacitance (nf) 0 slew rate (v/ s) 3 5 2801 g10 12 4 80 70 60 50 40 30 20 10 0 temperature ( c) ?50 short-circuit current (ma) 60 50 40 30 20 10 0 25 75 2801 g11 ?25 0 50 100 125 leakage current (a) 10 ?6 10 ?7 10 ?8 10 ?9 10 ?10 10 ?11 2801 g12 v l supply voltage (v) 1 threshold voltage (v) 3.0 2.5 2.0 1.5 1.0 0.5 0 2345 2801 g13 2801 g14 2801 g15 6 input high input low t a = 85 c t a = 25 c t a = ? 40 c v(tout) = 15v or v(tout) = ? 15v temperature ( c) ?50 25 75 ?25 0 50 100 125 sinking sourcing regulator can limit further falling (ltc2802/04) rising (ltc2802/04) falling (ltc2801/03) rising (ltc2801/03) receiver input threshold vs temperature (c) receiver output voltage vs load current receiver output duty cycle driver slew rate vs load capacitance driver short-circuit current vs temperature (c) shutdown or drivers disabled mode driver leakage vs temperature (c) 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. 4 .com u datasheet
8 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 pi fu ctio s uuu ode co tro l w u 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 1 f capacitor. v dd 4 6 6 generated positive supply voltage for rs-232 driver (7v). connect a 1 f capacitor between v dd and gnd. v ee 13* 17* 9 generated negative supply voltage for rs-232 driver (C6.3v). connect a 1 f capacitor between v ee and gnd. sw 5 7 7 switch pin. connect a 10 h 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-LTC2804 mode name ps mode receiver output(s) dc-dc driver output(s) i vcc *i vl * shutdown l l high-z off high-z 1 a1 a receivers active l h on off high-z 1 a15 a drivers disabled h l on on high-z 2.1ma 80 a or 150 a normal h h on on on 2.3ma 80 a or 150 a table 2. ltc2803-1, LTC2804-1 mode name on/ ? o ? f ? f receiver outputs dc-dc driver outputs i vcc *i vl * shutdown l high-z off high-z 1 a1 a normal h on on on 2.3ma 150 a * typical currents for static drivers. normal mode currents are for unloaded outputs. 4 .com u datasheet
9 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 block diagra w feature su ary ww 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 1 f c2 1 f ** ** ** ltc2803 LTC2804 ltc2803-1 LTC2804-1 ltc2801 ltc2802 ltc2803 LTC2804 ltc2803-1 LTC2804-1 ** ** cap sw c1 220nf l1 10 h v cc c4 1 f c5 220nf t2in t1in r2out r1out ps mode on/off v l 1.8v to 5.5v 1.8v to 5.5v 2801bd 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 de de dhc gn dhc gn 1.8v - 5.5v operation 1.8v - 5.5v logic supply (v l ) shutdown (1 a) receiver(s) active (15 a) driver disable 100kb/s for r l = 3k , c l = 2.5nf 250kb/s for r l = 3k , c l = 1nf 1mb/s for r l = 3k , c l = 250pf 4 .com u datasheet
10 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 applicatio s i for atio wu uu 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 10 h inductor (l1) and a bypass capacitor (c4) of at least 1 f. the recommended size for the charge pump capacitor (c1) is 220nf and for the storage capacitors (c2 and c3) is 1 f. larger storage capacitors up to 4.7 f 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. boost regulator v ee v dd c3 1 f c2 1 f cap sw c1 220nf l1 10 h v cc c4 1 f c5 220nf *omit if v l is connected to v cc * v l 1.8v to 5.5v 1.8v to 5.5v 2801f06 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). any voltage from 1.8v to 5.5v any voltage from 1.8v to 5.5v v l v cc external device rs-232 2801f07 figure 7. v cc and v l are independent power-saving modes when the dc-dc converter and drivers are turned off (ps or on/ ? o ? f ? f = logic low), v cc supply current is reduced to 1 a. tables 1 and 2 summarize the modes for each device. in shutdown mode, v l supply current is reduced to 1 a, 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 15 a 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 2 s, 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 con? guration typically minimizes conversion loss while providing compatibility with system logic levels. inductor selection a 10 h 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. 4 .com u datasheet
11 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 figure 8. supply overshoot protection for input supplies of 4.5v or higher applicatio s i for atio wu uu table 3. recommended inductors part i sat max dcr size number (ma) ( ) (mm) manufacturer lqh2mcn100k02l 225 1.2 2x1.6x0.95 murata www.murata.com lbc2016t100k 245 0.85 2x1.6x1.6 taiyo yuden www.t-yuden.com fslb2520-100k 220 1.1 2.5x2x1.6 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 10 s, 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 ? owing 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 10 s. 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). 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 2801f09 sw cap v dd gnd scale r1 with c1, c2, 1/c4 c1 220nf l1 10 h 4.5v to 5.5v v cc r1 1 ? 1/8w c4 1 f c2 1 f inrush current 2801f08 figure 9. recommended board layouts for (a) single and (b) dual transceiver parts 4 .com u datasheet
12 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 2801f10 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 2801f12 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 2801f13 ltc2802 v cc v l ps mode 3 10 8 9 11 12 tout rin tin rout 2 1 6 gnd 5v p 3v 2801f14 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 2801f15 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 2801f16 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 2801f17 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 figure 16. half-duplex on single line figure 15. half-duplex on single line, separate r out , t in 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 typical applicatio s u 2801f11 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 4 .com u datasheet
13 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 typical applicatio s u 2801f18 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 2801f19 ltc2803 ltc2803 l1 10 h 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 2 f c2 2 f c3 2 f 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 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) 2801f20 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 6 817 12 gnd ps t2in t1in v ee v dd 2 1 11 5 7 v l v l 0v 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 2801f21 4 .com u datasheet
14 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 package descriptio u 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 view?exposed 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 ? 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 dhc package 16-lead plastic dfn (5mm x 3mm) (reference ltc dwg # 05-08-1706) de/ue package 12-lead plastic dfn (4mm x 3mm) (reference ltc dwg # 05-08-1695) 4.00 0.10 (2 sides) 3.00 0.10 (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 0.38 0.10 bottom view?exposed pad 1.70 0.10 (2 sides) 0.75 0.05 r = 0.115 typ r = 0.20 typ 0.25 0.05 3.30 0.10 (2 sides) 1 6 12 7 0.50 bsc pin 1 notch pin 1 top mark (note 6) 0.200 ref 0.00 ? 0.05 (ue12/de12) dfn 0603 0.25 0.05 3.30 0.05 (2 sides) recommended solder pad pitch and dimensions 1.70 0.05 (2 sides) 2.20 0.05 0.50 bsc 0.65 0.05 3.50 0.05 package outline 4 .com u datasheet
15 2801234f 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. package descriptio u gn16 (ssop) 0204 12 3 4 5 6 7 8 .229 ? .244 (5.817 ? 6.198) .150 ? .157** (3.810 ? 3.988) 16 15 14 13 .189 ? .196* (4.801 ? 4.978) 12 11 10 9 .016 ? .050 (0.406 ? 1.270) .015 .004 (0.38 0.10) 45 0 ? 8 typ .007 ? .0098 (0.178 ? 0.249) .0532 ? .0688 (1.35 ? 1.75) .008 ? .012 (0.203 ? 0.305) typ .004 ? .0098 (0.102 ? 0.249) .0250 (0.635) bsc .009 (0.229) ref .254 min recommended solder pad layout .150 ? .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) 4 .com u datasheet
16 2801234f ltc2801/ltc2802/ ltc2803/LTC2804 figure 22. diagnostic port operating directly off unregulated battery voltage linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2005 lt/tp 0305 500 ? printed in usa typical applicatio u related parts part number description comments lt1780/lt1781 2-driver/2-receiver rs232 transceiver single 5v supply with 0.1 f 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 multi-drop applications ltc1348 3-driver/5-receiver rs232 transceiver true rs232 levels on 3.3v supply 2801f22 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 rd rts td cts rd rts td 6 8 79 v dd sw cap v ee gnd uart *additional bypass cap as needed p v cc 1.8v to 5.5v 1.8v to 5.5v dc-dc c2 1 f c5 220nf c4 1 f * * 17 c3 1 f c1 220nf l1 10 h 4 .com u datasheet

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