1 LTC1350 3.3v low power eia/tia-562 3-driver/ 5-receiver transceiver s f ea t u re d u escriptio n low supply current 300 m a n receivers 4 and 5 kept alive in shutdown 35 m a n esd protection 10kv n operates from a single 3.3v supply n uses small capacitors 0.1 m f n operates to 120kbaud n three-state outputs are high impedance when off n output overvoltage does not force current back into supplies n eia/tia-562 i/o lines can be forced to 25v without damage n flowthrough architecture the LTC1350 is a 3-driver/5-receiver eia/tia-562 trans- ceiver with very low supply current. in the no load condi- tion, the supply current is only 300 m a. the charge pump only requires four 0.1 m f capacitors. in shutdown mode, two receivers are kept alive and the supply current is only 35 m a. all rs232 outputs assume a high impedance state in shutdown or with the power off. t he LTC1350 is fully compliant with all data rate and overvoltage eia/tia-562 specifications. the transceiver can operate up to 120kbaud with a 1000pf and 3k w load. both driver outputs and receiver inputs can be forced to 25v without damage and can survive multiple 10kv esd strikes. u s a o pp l ic at i n notebook computers n palmtop computers u a o pp l ic at i ty p i ca l 3-drivers/5-receivers with shutdown quiescent and shutdown supply current vs temperature 1 2 3 4 5 6 7 8 9 10 11 12 13 14 v + v cc c1 + c1 dr1 out rx1 in dr2 out rx2 in rx3 in rx4 in dr3 out rx5 in on/off nc 28 27 26 25 24 23 22 21 20 19 18 17 16 15 v c2 + c2 dr1 in rx1 out dr2 in rx2 out rx3 out rx4 out dr3 in rx5 out gnd nc nc LTC1350 LTC1350 ?ta01 temperature (?c) ?0 quiescent current ( m a) 400 500 600 20 60 LTC1350 ?ta02 300 200 ?0 0 40 80 100 100 0 test condition: v cc = 3.3v all driver inputs tied to v cc shutdown current ( m a) 65 75 85 55 45 35 0 quiescent current shutdown current
2 LTC1350 a u g w a w u w a r b s o lu t exi t i s wu u package / o rder i for atio supply voltage (v cc ) ................................................ 5v input voltage driver ....................................... C 0.3v to v cc + 0.3v receiver ............................................... C 25v to 25v on/off pin ................................ C 0.3v to v cc + 0.3v output voltage driver .................................................... C 25v to 25v receiver .................................... C 0.3v to v cc + 0.3v short-circuit duration v + ................................................................... 30 sec v C ................................................................... 30 sec driver output .............................................. indefinite receiver output .......................................... indefinite operating temperature range commercial (LTC1350c) ........................ 0 c to 70 c industrial (LTC1350i) ........................ C 40 c to 85 c storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c order part number LTC1350cg LTC1350cn LTC1350cs LTC1350ig LTC1350in LTC1350is t jmax = 125 c, q ja = 96 c/w (g) t jmax = 125 c, q ja = 56 c/w (n) t jmax = 125 c, q ja = 85 c/w (s) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 v + v cc c1 + c1 dr1 out rx1 in dr2 out rx2 in rx3 in rx4 in dr3 out rx5 in on/off nc 28 27 26 25 24 23 22 21 20 19 18 17 16 15 v c2 + c2 dr1 in rx1 out dr2 in rx2 out rx3 out rx4 out dr3 in rx5 out gnd nc nc n package 28-lead plastic dip top view s package 28-lead plastic sol g package 28-lead ssop consult factory for military grade parts v cc = 3.3v, c1 = c2 = c3 = c4 = 0.1 m f, unless otherwise noted. e lectr ic al c c hara terist ics c d parameter conditions min typ max units any driver output voltage swing 3k to gnd positive l 3.7 4.5 v negative l C 3.7 C 4.5 v logic input voltage level input low level (v out = high) l 1.4 0.8 v input high level (v out = low) l 2.0 1.4 v logic input current v in = v cc l 5 m a v in = 0v l C5 m a output short-circuit current v out = 0v 10 ma output leakage current shutdown (note 3), v out = 20v 10 500 m a any receiver input voltage thresholds input low threshold l 0.8 1.3 v input high threshold l 1.7 2.4 v hysteresis l 0.1 0.4 1 v input resistance v in = 10v 3 5 7 k w output voltage output low, i out = C 1.6ma (v cc = 3.3v) l 0.2 0.4 v output high, i out = 160 m a (v cc = 3.3v) l 3.0 3.2 v output short-circuit current sinking current, v out = v cc C3 C20 ma output leakage current shutdown (note 3), 0v v out v cc l 110 m a
3 LTC1350 v cc = 3.3v, c1 = c2 = c3 = c4 = 0.1 m f, unless otherwise noted. e lectr ic al c c hara terist ics c d parameter conditions min typ max units power supply generator v + output voltage i out = 0ma 5.7 v i out = 5ma 5.5 v v C output voltage i out = 0ma C 5.3 v i out = C5ma C5.0 v supply rise time shutdown to turn-on 0.2 ms power supply v cc supply current no load (all drivers v in = v cc )(note 2) 0 c t a 70 c l 0.3 0.6 ma no load (all drivers v in = 0)(note 2) 0 c t a 70 c l 0.5 1.0 ma no load (all drivers v in = v cc )(note 2) 0 c t a 85 c l 0.3 1.0 ma no load (all drivers v in = v cc )(note 2) C 40 c t a 0 c l 0.3 1.5 ma no load (all drivers v in = 0)(note 2) C 40 c t a 85 c l 0.5 1.5 ma shutdown (note 3) l 35 50 m a on/off threshold low l 1.4 0.8 v on/off threshold high l 2.0 1.4 v the l denotes specifications which apply over the operating temperature range of 0 c t a 70 c for commercial grade, C 40 c t a 85 c for industrial grade. note 1: absolute maximum ratings are those values beyond which the life of the device may be impaired. note 2: supply current is measured with driver and receiver outputs unloaded. note 3: supply current measurement in shutdown mode is performed with v on/off = 0v. cc hara terist ics ac parameter conditions min typ max units slew rate r l = 3k, c l = 51pf 8 30 v/ m s r l = 3k, c l = 1000pf 3 5 v/ m s driver propagation delay t hld (figure 1) l 2 3.5 m s (ttl to eia/tia-562) t lhd (figure 1) l 2 3.5 m s receiver propagation delay t hlr (figure 2) l 0.3 0.8 m s (eia/tia-562 to ttl) t lhr (figure 2) l 0.3 0.8 m s v cc = 5v, c1 = c2 = c3 = c4 = 0.1 m f, unless otherwise noted.
4 LTC1350 typical perfor a ce characteristics wu driver output voltage vs temperature receiver input thresholds vs temperature driver short-circuit current vs temperature driver leakage in shutdown vs temperature v cc supply current vs temperature supply current vs data rate temperature (?) ?0 ? driver output voltage (v) ? ? ? 0 5 2 0 40 60 LTC1350 ?tpc01 ? 3 4 1 ?0 20 80 100 v cc = 3.3v output high v cc = 3.3v output low all drivers with load, r l = 3k temperature (?c) ?0 threshold voltage (v) 1.8 2.0 v th + v th 2.2 20 60 lt1350 ?tpc02 1.6 1.4 ?0 0 40 80 100 1.2 1.0 data rate (k baud) 0 supply current (ma) 20 25 30 60 100 LTC1350 ?tpc03 15 10 20 40 80 120 140 5 0 v cc = 3.3v r l = 3k c l = 2500pf 3 drivers active temperature (?) ?0 0 supply current (ma) 0.5 1.5 2.0 2.5 5.0 3.5 0 40 60 LTC1350 ?tpc04 1.0 4.0 4.5 3.0 ?0 20 80 100 r l = 3k 3 drivers loaded r l = 3k 1 driver loaded temperature (?) 0 leakage current ( m a) 60 45 40 35 30 25 20 15 10 5 0 LTC1350 ?tpc05 20 70 10 30 40 50 v out = 20v v out = 20v temperature (?c) ?0 short-circuit current (ma) 14 20 i sc i sc + LTC1350 ?tpc06 8 4 ?0 0 40 2 0 16 12 10 6 60 80 100 receiver short-circuit current vs temperature temperature (?c) ?0 short-circuit current (ma) 35 20 i sc i sc + LTC1350 ?tpc07 20 10 ?0 0 40 5 0 40 30 25 15 60 80 100 driver output r l = 3k c l = 1000pf driver output r l = 3k input LTC1350 ? tpc08 receiver output c l = 50pf input LTC1350 ? tpc09 driver output waveforms receiver output waveform
5 LTC1350 pi fu ctio s u uu v cc : 3.3v input supply pin. supply current is typically 35 m a in the shutdown mode. this pin should be de- coupled with a 0.1 m f ceramic capacitor. gnd: ground pin. on/off: ttl/cmos compatible shutdown pin. a logic low puts the device in the shutdown mode with receiv- ers 4 and 5 kept alive and the supply current equal to 35 m a. all driver and other receiver outputs are in high impedance state. this pin cannot float. v + : positive supply output. v + @ 2v cc C 1v. this pin requires an external capacitor (c = 0.1 m f) for charge storage. the capacitor may be tied to ground or v cc . with multiple devices, the v + and v C pins may be paralleled into common capacitors. for a large number of devices, in- creasing the size of the shared common storage capaci- tors is recommended to reduce ripple. v C : negative supply output. v C @ C (2v cc C 1.3v). this pin requires an external capacitor (c = 0.1 m f) for charge storage. switchi g ti e wavefor s ww u 1.4v 0v v cc 0v v + v 0v dr input dr output 1.4v t hld t lhd LTC1350 ?f01 0.8v v cc 0v 2.4v rx input rx output 1.3v t hlr 1.7v t lhr LTC1350 ?f02 v cc 0v figure 2. receiver propagation delay timing figure 1. driver propagation delay timing c1 + , c1 C , c2 + , c2 C : commutating capacitor inputs. these pins require two external capacitors (c = 0.1 m f): one from c1 + to c1 C and another from c2 + to c2 C . to maintain charge pump efficiency, the capacitors effective series resistance should be less than 20 w . dr in: eia/tia-562 driver input pins. inputs are ttl/ cmos compatible. inputs should not be allowed to float. tie unused inputs to v cc . dr out: driver outputs at eia/tia-562 voltage levels. outputs are in a high impedance state when in the shut- down mode or v cc = 0v. the driver outputs are protected against esd to 10kv for human body model discharges. rx in: receiver inputs. these pins can be forced to 25v without damage. the receiver inputs are protected against esd to 10kv for human body model discharges. each receiver provides 0.4v of hysteresis for noise immunity. rx out: receiver outputs with ttl/cmos voltage lev- els. receiver 1, 2 and 3 outputs are in a high impedance state when in shutdown mode to allow data line sharing. receivers 4 and 5 are kept alive in shutdown.
6 LTC1350 test circuits esd test circuit receiver timing test load driver timing test load driver driver input 3k 51pf driver output LTC1350 ?ta03 rx rx input 51pf rx output LTC1350 ?ta04 LTC1350 ?tc v cc c1 0.1 m f LTC1350 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 c3 0.1 m f v v + c2 0.1 m f c4 0.1 m f rs232 line pins protected to 10kv dr1 in rx1 out dr2 in rx2 out rx3 out rx4 out dr3 in rx5 out gnd nc nc dr1 out rx1 in dr2 out rx2 in rx3 in rx4 in dr3 out rx5 in on/off nc
7 LTC1350 package descriptio u dimensions in inches (millimeters) unless otherwise noted. g package 28-lead ssop 0.301 ?0.311 (7.65 ?7.90) 1234 5 6 7 8 9 10 11 12 14 13 0.397 ?0.407* (10.07 ?10.33) 25 26 22 21 20 19 18 17 16 15 23 24 27 28 0.045 (1.14) 0.045 (1.14) 0.068 ?0.078 (1.73 ?1.99) 0.002 ?0.008 (0.05 ?0.21) 0.0256 (0.65) bsc 0.010 ?0.015 (0.25 ?0.38) 0.005 ?0.009 (0.13 ?0.22) 0??8 0.022 ?0.037 (0.55 ?0.95) 0.205 ?0.212* (5.20 ?5.38) *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.006 inch (0.15mm). 0??8?typ note 1 0.009 ?0.013 (0.229 ?0.330) 0.016 ?0.050 (0.406 ?1.270) 0.291 ?0.299 (7.391 ?7.595) (note 2) 45 0.010 ?0.029 (0.254 ?0.737) 0.005 (0.127) rad min 0.037 ?0.045 (0.940 ?1.143) 0.004 ?0.012 (0.102 ?0.305) 0.093 ?0.104 (2.362 ?2.642) 0.050 (1.270) typ 0.014 ?0.019 (0.356 ?0.482) note 1 0.697 ?0.712 (17.70 ?18.08) (note 2) 0.394 ?0.419 (10.007 ?10.643) 1 23 4 5 6 789101112 14 13 25 26 22 21 20 19 18 17 16 15 23 24 27 28 note: 1. pin 1 ident, notch on top and cavities on the bottom of packages are the manufacturing options. the part may be supplied with or without any of the options. 2. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.006 inch (0.15mm). 0.505 ?0.560 (12.827 ?14.224) 1.455 (36.957) max 12 3 4 5 6 7 8 9 10 27 19 20 21 22 24 23 25 26 28 11 12 13 14 15 16 17 18 0.009 ?0.015 (0.229 ?0.381) 0.625 +0.025 0.015 +0.635 0.381 15.87 () 0.600 ?0.625 (15.240 ?15.875) 0.070 (1.778) typ 0.015 (0.381) min 0.125 (3.175) min 0.130 ?0.005 (3.302 ?0.127) 0.018 ?0.003 (0.457 ?0.076) 0.035 ?0.080 (0.889 ?2.032) 0.100 ?0.010 (2.540 ?0.254) 0.045 ?0.065 (1.143 ?1.651) n package 28-lead plastic dip s package 28-lead plastic sol 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
8 LTC1350 ? linear technology corporation 1993 sn1350 1350fs lt/gp 1293 10k rev 0 ? printed in usa world headquarters linear technology corporation 1630 mccarthy blvd. milpitas, ca 95035-7417 phone: (408) 432-1900 fax: (408) 434-0507 www.linear-tech.com u.s. area sales offices northeast region linear technology corporation 3220 tillman drive suite 120 bensalem, pa 19020 phone: (215) 638-9667 fax: (215) 638-9764 linear technology corporation 15 research place north chelmsford, ma 01863 phone: (978) 656-4750 fax: (978) 656-4760 northwest region linear technology corporation 720 sycamore drive milpitas, ca 95035 phone: (408) 428-2050 fax: (408) 432-6331 southeast region linear technology corporation 17000 dallas parkway suite 219 dallas, tx 75248 phone: (972) 733-3071 fax: (972) 380-5138 linear technology corporation 9430 research blvd. echelon iv suite 400 austin, tx 78759 phone: (512) 343-3679 fax: (512) 343-3680 linear technology corporation 1080 west sam houston parkway suite 225 houston, tx 77043 phone: (713) 463-5001 fax: (713) 463-5009 linear technology corporation 15100 weston parkway suite 202 carey, nc 27513 phone: (919) 677-0066 fax: (919) 678-0041 central region linear technology corporation 2010 e. algonquin road suite 209 schaumburg, il 60173 phone: (847) 925-0860 fax: (847) 925-0878 linear technology corporation kenosha, wi 53144 phone: (262) 859-1900 fax: (262) 859-1974 southwest region linear technology corporation 21243 ventura blvd. suite 208 woodland hills, ca 91364 phone: (818) 703-0835 fax: (818) 703-0517 linear technology corporation 15375 barranca parkway suite a-213 irvine, ca 92618 phone: (949) 453-4650 fax: (949) 453-4765 international sales offices china (hong kong) linear technology corp. ltd. unit 2109, metroplaza tower 2 223 hing fong road kwai fong, n.t., hong kong phone: +852 2428-0303 fax: +852 2348-0885 france linear technology s.a.r.l. immeuble "le quartz" 58 chemin de la justice 92290 chatenay malabry france phone: +33 (1) 41079555 fax: +33 (1) 46314613 germany linear technology gmbh oskar-messter-str. 24 d-85737 ismaning germany phone: +49 (89) 962455-0 fax: +49 (89) 963147 linear technology gmbh haselburger damm 4 d-59387 ascheberg germany phone: +49 (2593) 9516-0 fax: +49 (2593) 951679 linear technology gmbh zettachring 12 d-70567 stuttgart germany phone: +49 (711) 1329890 fax: +49 (711) 7285055 japan linear technology kk 5f nao bldg. 1-14 shin-ogawa-cho shinjuku-ku tokyo, 162 japan phone: +81 (3) 3267-7891 fax: +81 (3) 3267-8510 linear technology kk 6f tokyo seimei honmachi bldg. 1-6-13 awaza, nishi-ku osaka-shi, 550-0011, japan phone: +81 (6) 6533-5880 fax: +81 (6) 6533-5885 korea linear technology korea co., ltd. yundang building, #1002 samsung-dong 144-23 kangnam-ku, seoul 135-090 korea phone: +82 (2) 792-1617 fax: +82 (2) 792-1619 singapore linear technology pte. ltd. 507 yishun industrial park a singapore 768734 phone: +65 753-2692 fax: +65 752-0108 sweden linear technology ab sollentunav?gen 63 s-191 40 sollentuna sweden phone: +46 (8) 623-1600 fax: +46 (8) 623-1650 taiwan linear technology corporation rm. 602, no. 46, sec. 2 chung shan n. rd. taipei, taiwan, r.o.c. phone: +886 (2) 2521-7575 fax: +886 (2) 2562-2285 united kingdom linear technology (uk) ltd. the coliseum, riverside way camberley, surrey gu15 3yl united kingdom phone: +44 (1276) 677676 fax: +44 (1276) 64851 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com
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