1 ltc1338 5v low power rs232 5-driver/3-receiver transceiver s f ea t u re d u escriptio low supply current: 500 a 0.2 a supply current in shutdown 50 a supply current in receiver alive mode esd protection over 10kv operates from a single 5v supply uses small capacitors: 0.1 f operates to 120k baud three-state outputs are high impedance when off output overvoltage does not force currentback into supplies rs232 i/o lines can be forced to 25v without damage flowthrough architecture the ltc1338 is a 5-driver/ 3-receiver rs232 trans- ceiver with very low supply current. in the no load condition, the supply current is only 500 a. the charge pump only requires four 0.1 f capacitors. in shutdown mode, the supply current is furtherreduced to 0.2 a. in receiver alive mode, all three receivers are kept alive and the supply current is 50 a. all rs232 outputs assume a high impedance state inshutdown and with the power off. the ltc1338 is fully compliant with all data rate and overvoltage rs232 specifications. the transceiver can operate up to 120k baud with a 2500pf, 3k 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 battery-powered modems battery-powered dce notebook computers palmtop computers u a o pp l ic at i ty p i ca l 5-drivers/3-receivers with shutdown ltc1338 ? ta01 v cc c1
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driver 2 out
rx1 in
driver 3 out
rx2 in
driver 4 out
rx3 in
driver 5 out
rx enable
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driver 2 in
rx1 out
driver 3 in
rx2 out
driver 4 in
rx3 out
driver 5 in
gnd
driver enable
nc v v + c2
0.1 f c4
0.1 f temperature (?)
quiescent current ( a) 1200
1000
800
600
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0 20 40 60 ltc1338 ?ta02 80 0 ?0 1.2
1.0
0.8
0.6
0.4
0.2
0
shutdown current ( a) quiescent
current shutdown
current ?0 test condition:
v cc = 5v, all driver inputs tied to v cc . 100 supply current downloaded from: http:///
2 ltc1338 a u g w a w u w a r b s o lu t ex i t i s wu u package / o rder i for atio order part number 1
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v cc
c1 +
c1
dr1 out
dr2 out
rx1 in
dr3 out
rx2 in
dr4 out
rx3 in
dr5 out
rx enable
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c2 +
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dr2 in
rx1 out
dr3 in
rx2 out
dr4 in
rx3 out
dr5 in
gnd
dr enable
nc n package
28-lead plastic dip top view s package
28-lead plastic sol g package
28-lead ssop t jmax = 125 c, ja = 96 c/w (g) t jmax = 125 c, ja = 56 c/w (n) t jmax = 125 c, ja = 85 c/w (s) parameter conditions min typ max units any driver output voltage swing 3k to gnd positive 5.0 7.0 v negative 5.0 6.5 v logic input voltage level input low level (v out = high) 1.4 0.8 v input high level (v out = low) 2.0 1.4 v logic input current 0 v in v cc 5 a output short-circuit current v out = 0v 12 ma output leakage current shutdown, v out = 20v (note 3) 10 500 a any receiver input voltage thresholds input low threshold 0.8 1.3 v input high threshold 1.7 2.4 v hysteresis 0.1 0.4 1 v input resistance 10v v in 10v 3 5 7 k output voltage output low, i out = 1.6ma (v cc = 5v) 0.2 0.4 v output high, i out = 160 a (v cc = 5v) 3.5 4.8 v output short-circuit current sinking current, v out = v cc 15 40 ma output leakage current shutdown, 0 v out v cc (note 3) 11 0 a power supply generatorv + output voltage i out = 0ma 8.0 v i out = 12ma 7.5 v v output voltage i out = 0ma 8.0 v i out = 12ma 7.0 v supply rise time shutdown to turn-on 0.2 ms ltc1338cgltc1338cn ltc1338cs ltc1338ig ltc1338in ltc1338is supply voltage (v cc ) ................................................ 6v input voltage driver ....................................... 0.3v to v cc + 0.3v receiver ............................................... 25v to 25v driver/receiver enable pin ........ 0.3v to v cc + 0.3v output voltage driver .................................................... 25v to 25v receiver .................................... 0.3v to v cc + 0.3v short circuit duration v + ................................................................... 30 sec v ................................................................... 30 sec driver output .............................................. indefinite receiver output .......................................... indefinite operating temperature range commercial (ltc1338c) ........................ 0 c to 70 c industrial (ltc1338i) ........................ 40 c to 85 c storage temperature range ................ 65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c (note 1) v cc = 5v, c1 = c2 = c3 = c4 = 0.1 f, unless otherwise noted. e lectr ic al c c hara terist ics c d downloaded from: http:///
3 ltc1338 v cc = 5v, c1 = c2 = c3 = c4 = 0.1 f, unless otherwise noted. e lectr ic al c c hara terist ics c d cc hara terist ics ac note 3: supply current and leakage current measurements in shutdown are performed with v driver enable and v receiver enable = 0v. note 4: supply current measurement in receiver alive mode is performed with v driver enable = 0v and v receiver enable = v cc . the denotes specifications which apply over the operating temperature range of 0 c to 70 c or 40 c to 85 c. 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. the v driver enable and v receiver enable = v cc . parameter conditions min typ max units slew rate r l = 3k, c l = 51pf 8 30 v/ s r l = 3k, c l = 2500pf 3 5 v/ s driver propagation delay t hld (figure 1) 2 3.5 s (ttl to rs232) t lhd (figure 1) 2 3.5 s receiver propagation delay t hlr (figure 2) 0.3 0.8 s (rs232 to ttl) t lhr (figure 2) 0.2 0.8 s v cc = 5v, c1 = c2 = c3 = c4 = 0.1 f, unless otherwise noted. typical perfor a ce characteristics wu data rate (k baud) 0 supply current (ma) 40 50 60 60 100 ltc1338 ? tpc03 30 20 20 40 80 120 140 10 0 v cc = 5v
r l = 3k
c l = 2500pf
5 drivers active temperature (?c) ?0 threshold voltage (v) 1.8 2.0 2.2 20 60 ltc1338 ? tpc02 1.6 1.4 ?0 0 40 80 100 1.2 1.0 v th v tl temperature (?) ?0 ? driver output voltage (v) ? ? 0 2 40 10 ltc1338 ? tpc01 ? 08 0 4 6 8 ?0 60 20 100 r l = 3k output high v cc = 5v v cc = 4.5v output low v cc = 4.5v v cc = 5v driver output voltage receiver input thresholds supply current vs data rate parameter conditions min typ max units power supplyv cc supply current no load (all driver v in = v cc )(note 2) 0 c t a 70 c 0.5 1.0 ma no load (all driver v in = 0v)(note 2) 0 c t a 70 c 1.0 1.5 ma no load (all driver v in = v cc )(note 2) 40 c t a 85 c 0.5 1.5 ma no load (all driver v in = 0v)(note 2) 40 c t a 85 c 1.0 2.0 ma receiver alive mode (note 4) 50 80 a supply leakage current (v cc ) shutdown (note 3) 0.2 10 a driver/receiver enable threshold low 1.4 0.8 v driver/receiver enable threshold high 2.0 1.4 v downloaded from: http:///
4 ltc1338 typical perfor a ce characteristics wu v cc supply current driver leakage in shutdown driver short-circuit current temperature (?) ?0 supply current (ma) 20 25 30 20 60 ltc1338 ? tpc04 15 10 ?0 0 40 80 100 5 0 5 drivers loaded
r l = 3k 1 driver loaded
r l = 3k temperature (?) ?0 0 short-circuit current (ma) 4 8 10 12 40 20 ltc1338 ? tpc06 6 08 0 14 16 18 ?0 60 20 100 i sc + i sc temperature (?) ?0 0 leakage current ( a) 20 50 0 40 60 ltc1338 ?tpc05 10 40 30 ?0 20 80 100 v out = 20v v out = 20v receiver short-circuit current driver output waveforms receiver output waveforms temperature (?) ?0 10 short-circuit current (ma) 30 60 0 40 60 ltc1338 ?tpc07 20 50 40 ?0 20 80 100 i sc i sc + driver output r l = 3k c l = 2500pf driver output r l = 3k input ltc1338 ?tpc08 ltc1338 ?tpc09 receiver output c l = 50pf input pi fu ctio s u uu v cc : 5v input supply pin. supply current less than 0.2 a in the shutdown mode. this pin should be decoupledwith a 0.1 f ceramic capacitor. gnd: ground pin. receiver enable: ttl/cmos compatible enable pin. refer to table 1 for its functional description. this pin cannot float. driver enable: ttl/cmos compatible enable pin. re- fer to table 1 for its functional description. this pin can notfloat. v + : positive supply output (rs232 drivers). v + ? 2v cc 1v. this pin requires an external capacitor c = 0.1 f for charge storage. the capacitor may be tied to ground or 5v.with multiple devices, the v + and v pins may be paral- leled into common capacitors. for large numbers ofdevices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. v : negative supply output (rs232 drivers). v ? 2v cc ?1.5v. this pin requires an external capacitor c = 0.1 f for charge storage.c1 + , c1 , c2 + , c2 : commutating capacitor inputs. these pins require two external capacitors c = 0.1 f: one from c1 + to c1 , and another from c2 + to c2 . to maintain charge pump efficiency, the capacitor? effective seriesresistance should be less than 20 . downloaded from: http:///
5 ltc1338 pi fu ctio s u uu driver in: rs232 driver input pins. inputs are ttl/ cmos compatible. inputs should not be allowed to float.tie unused inputs to v cc . driver out: driver outputs at rs232 voltage levels. outputs are in a high impedance state when in shut-down, receiver alive 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 againstesd 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. outputs are in a high impedance state when in shut-down or receiver disable mode to allow data line sharing. table 1. functional description mode rx enable dr enable drivers receivers i cc ( a)(typ) shutdown 0 0 all driver outputs are all receiver outputs are 0.2 high impedance. high impedance. receiver disable 0 1 all drivers alive. all receiver outputs are 500 high impedance. receiver alive 1 0 all driver outputs are all receivers alive. 50 high impedance. normal 1 1 all drivers alive. all receivers alive. 500 ti w e wavefor s u g witchi w s figure 1. driver propagation delay timing figure 2. receiver propagation delay timing 1.4v 0v v cc 0v v + v 0v driver
input
driver
output
1.4v t hld t lhd ltc1338 ?f01 0.8v v cc 0v 2.4v rx
input rx
output
1.3v t hlr 1.7v t lhr ltc1338 ?f02 v cc 0v downloaded from: http:///
6 ltc1338 test circuits driver timing test load receiver timing test load rx rx input 51pf rx
output ltc1338 ?f04 driver driver
input 3k 51pf driver
output ltc1338 ?f03 esd test circuit ltc1338 ? tc01 v cc c1
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driver enable
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0.1 f c4
0.1 f rs232
line pins
protected
to 10kv downloaded from: http:///
7 ltc1338 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. 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 2526 22 21 20 19 18 17 16 15 2324 2728 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). s package 28-lead sol 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 1413 0.397 ?0.407*
(10.07 ?10.33)
2526 22 21 20 19 18 17 16 15 2324 2728 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). n package 28-lead plastic dip 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) downloaded from: http:///
8 ltc1338 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7487 (408) 432-1900 fax : (408) 434-0507 telex : 499-3977 ? linear technology corporation 1993 lt/gp 1093 10k rev 0 ? printed in usa northeast regionlinear technology corporation one oxford valley 2300 e. lincoln hwy.,suite 306 langhorne, pa 19047 phone: (215) 757-8578 fax: (215) 757-5631 linear technology corporation 266 lowell st., suite b-8 wilmington, ma 01887 phone: (508) 658-3881 fax: (508) 658-2701 u.s. area sales officessoutheast region linear technology corporation 17060 dallas parkway suite 208 dallas, tx 75248 phone: (214) 733-3071 fax: (214) 380-5138 central region linear technology corporation chesapeake square 229 mitchell court, suite a-25 addison, il 60101 phone: (708) 620-6910 fax: (708) 620-6977 southwest regionlinear technology corporation 22141 ventura blvd. suite 206 woodland hills, ca 91364 phone: (818) 703-0835 fax: (818) 703-0517 northwest region linear technology corporation 782 sycamore dr. milpitas, ca 95035 phone: (408) 428-2050 fax: (408) 432-6331 francelinear 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 techonolgy gmbh untere hauptstr. 9 d-85386 eching germany phone: 49-89-3197410 fax: 49-89-3194821 japan linear technology kk 5f yz bldg. 4-4-12 iidabashi, chiyoda-ku tokyo, 102 japan phone: 81-3-3237-7891 fax: 81-3-3237-8010 taiwanlinear technology corporation rm. 801, no. 46, sec. 2 chung shan n. rd. taipei, taiwan, r.o.c. phone: 886-2-521-7575 fax: 886-2-562-2285 united kingdom linear technology (uk) ltd. the coliseum, riverside way camberley, surrey gu15 3yl united kingdom phone: 44-276-677676 fax: 44-276-64851 korealinear technology korea branch namsong building, #505 itaewon-dong 260-199 yongsan-ku, seoul korea phone: 82-2-792-1617 fax: 82-2-792-1619 singapore linear technology pte. ltd. 101 boon keng road #02-15 kallang ind. estates singapore 1233 phone: 65-293-5322 fax: 65-292-0398 world headquarterslinear technology corporation 1630 mccarthy blvd. milpitas, ca 95035-7487 phone: (408) 432-1900 fax: (408) 434-0507 08/16/93 international sales offices downloaded from: http:///
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