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1 lt1080/lt1081 10801fe advanced low power 5v rs232 dual driver/receiver the lt ? 1080/lt1081 are the only dual rs232 driver/ receiver with charge pump to guarantee absolutely no latchup. these interface optimized devices provide a real- istic balance between cmos levels of power dissipation and real world requirements for ruggedness. the driver outputs are fully protected against overload and can be shorted to 30v. unlike cmos, the advanced architecture of the lt1080/lt1081 does not load the signal line when shut down or when power is off. both the receiver and rs232 outputs are put into a high impedance state. an advanced output stage allows driving higher capacitive loads at higher speeds with exceptional ruggedness against esd. for applications requiring up to five drivers and five receivers with charge pump in one package see the lt1130a series data sheet. a version of the lt1080/lt1081, the lt1180a and lt1181a that use only 0.1 m f capacitors, is also available. all of linear technologys rs232 ics are available in standard surface mount packages. n superior to cmos C improved speed: operates over 120kbaud C improved protection: outputs can be forced to 30v without damage C three-state outputs are high impedance when off C only needs 1 m f capacitors n absolutely no latchup n cmos comparable low power: 60mw n can power additional rs232 drivers: 10ma n supply current in shutdown: 1 m a n available in so package n available with or without shutdown , ltc and lt are registered trademarks of linear technology corporation. n portable computers n battery-powered rs232 systems n power supply generator n terminals n modems supply generator outputs output current (ma) 02468101214161820 output voltage (v) 1080/81 ta01a 10 8 6 4 2 0 ? ? ? ? ?0 v cc = 5v v + output r l to v r l to gnd r l to gnd r l to v + v output logic inputs logic outputs on/off 18 10 13 11 12 6 5 4 2 16 9 14 8 15 7 3 17 5v input 9v output 9v output rs232 output rs232 output rs232 input rs232 input 1080/81 ta01 5k 5k lt1080 1 m f 1 m f 1 m f 1 m f features descriptio u applicatio s u typical applicatio u
2 lt1080/lt1081 10801fe a u g w a w u w a r b s o lu t exi t i s supply voltage (v cc ) ................................................. 6v v + ........................................................................................... 12v v C ....................................................................................... C12v input voltage driver ........................................................... v C to v + receiver ................................................. C30v to 30v on/off pin .............................................. gnd to 12v output voltage driver ................................. (v C + 30v) to (v + C 30v) receiver .................................. C0.3v to (v cc + 0.3v) short-circuit duration v + ...................................................................................... 30 sec v C ...................................................................................... 30 sec driver output ............................................... indefinite receiver output ........................................... indefinite operating temperature range lt1080c/lt1081c ................................. 0 c to 70 c lt1080i/lt1081i ................................ C40 c to 85 c lt1080m/lt1081m (obsolete) ... C55 c to 125 c storage temperature range ..................C65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c lt1081cn lt1081csw lt1081in lt1081isw lt1081cj lt1081mj lt1080cn lt1080csw lt1080in lt1080isw lt1080cj lt1080mj order part number order part number t jmax = 150 c, q ja = 120 c/w, q jc = 50 c/w (n) t jmax = 150 c, q ja = 90 c/w, q jc = 26 c/w (sw) wu u package / o rder i for atio t jmax = 150 c, q ja = 120 c/w, q jc = 50 c/w (n) t jmax = 150 c, q ja = 95 c/w, q jc = 27 c/w (sw) 1 2 3 4 5 6 7 8 top view 16 15 14 13 12 11 10 9 c1 + v + c1 c2 + c2 v tr2 out rec2 in v cc gnd tr1 out rec1 in rec1 out tr1 in tr2 in rec2 out n package 16-lead pdip sw package 16-lead plastic so wide lt1081 sw package 18-lead plastic so wide 1 2 3 4 5 6 7 8 9 top view n package 18-lead pdip 18 17 16 15 14 13 12 11 10 nc c1 + v + c1 c2 + c2 v tr2 out rec2 in on/off v cc gnd tr1 out rec1 in rec1 out tr1 in tr2 in rec2 out lt1080 (note 1) consult ltc marketing for parts specified with wider operating temperature ranges. j package 18-lead cerdip t jmax = 150 c, q ja = 100 c/w, q jc = 40 c/w (j) j package 16-lead cerdip t jmax = 150 c, q ja = 100 c/w, q jc = 40 c/w (j) obsolete package consider n package for alternate source obsolete package consider n package for alternate source
3 lt1080/lt1081 10801fe e lectr ic al c c hara terist ics the l denotes the specifications which apply over the full operating parameter conditions min typ max units driver output voltage swing load = 3k to gnd both outputs positive l 5 7.3 v negative l C5 C6.5 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 1.4 v logic input current v in 3 2v l 520 m a v in 0.8v l 520 m a output short-circuit current sourcing current, v out = 0v 9 12 ma sinking current, v out = 0v C9 C12 ma output leakage current shutdown (note 3), v out = 30v l 10 100 m a data rate (note 6) r l = 3k, c l = 2500pf 120 kbd r l = 3k, c l = 1000pf 250 kbd slew rate r l = 3k, c l = 51pf 4 15 30 v/ m s receiver input voltage thresholds input low threshold commercial l 0.8 1.3 v industrial and military l 0.2 1.3 v input high threshold commercial l 1.7 2.4 v industrial and military l 1.7 3.0 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 = C1.6ma l 0.2 0.4 v output high, i out = 160 m a (v cc = 5v) l 3.5 4.8 v output short-circuit current sinking current, v out = v cc C10 C20 ma sourcing current, v out = 0v 0.6 1 ma output leakage current shutdown (note 3), 0v v out v cc l 110 m a power supply generator (note 4) v + output voltage i out = 0ma 8.0 9.0 v i out = 10ma 7.0 8.0 v i out = 15ma 6.5 7.5 v v C output voltage i out = 0ma C7.5 C8.5 v i out = C10ma C5.5 C6.5 v i out = C15ma C5.0 C6.0 v supply current l 12 22 ma supply leakage current (v cc ) shutdown (note 3), lt1080 only l 1 100 m a on/off pin current 0v v on/off 5v, lt1080 only l C15 80 m a supply rise time (note 5), lt1080 only 1 ms note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: these parameters apply for 4.5v v cc 5.5v and v on/off = 3v, unless otherwise specified. note 3: v on/off = 0.4v for C55 c t a 50 c, and v on/off = 0.2v for 50 c t a 125 c. (lt1080 only) note 4: unless otherwise specified, v cc = 5v, external loading of v + and v C equals zero and the driver outputs are low (inputs high). note 5: time from either shutdown high or power on until v + 3 6v and v C C6v. all external capacitors are 1 m f. note 6: data rate operation guaranteed by slew rate, short-circuit current and propagation delay tests. temperature range, otherwise specifications are at t a = 25 c. (note 2)
4 lt1080/lt1081 10801fe pi fu ctio s uuu (pin numbers refer to lt1080) temperature ( c) 55 25 0 25 50 75 100 125 driver output voltage (v) 1080/81 g01 10 8 6 4 2 0 ? ? ? ? ?0 v cc = 5.5v v cc = 4.5v r l = 3k output high v cc = 5.5v v cc = 4.5v output low v cc = 5v v cc = 5v time (ms) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 supply voltage (v) 1080/81 g03 10 8 6 4 2 0 ? ? ? ? ?0 v + supply v cc = 5v c1 to c4 = 1 f r l = 4.7k; v + to v v supply output current (ma) 02468101214161820 output voltage (v) 1080/81 g02 10 8 6 4 2 0 ? ? ? ? ?0 v cc = 5v v + output voltage loaded to v loaded to ground loaded to ground loaded to v + v output voltage driver output voltage supply generator outputs supply generation from v cc or shutdown c1 + ; c1 C ; c2 + ; c2 C (pins 2, 4, 5, 6): requires an external capacitor ( 3 1 m f) from c1 + to c1 C and another from c2 + to c2 C . pin 2 can be used for connecting a second positive supply. when a separate positive supply is used, c1 can be deleted. v + (pin 3): positive supply for rs232 drivers. v + ? 2v cc C 1.5v. requires an exterenal capacitor ( 3 1 m f) for charge storage. may be loaded (up to 15ma) for external system use. loading does reduce v + voltage (see graphs). capacitor may be tied to ground or +5v input supply. with multiple transceivers, the v + and v C pins may be paralleled into common capacitors. v C (pin 7): negative supply for rs232 drivers. v C ? C(2v cc C 2.5v). requires an external capacitor ( 3 1 m f) for charge stroage. may be loaded (up to C15ma) for external system use. loading does reduce v C voltage (see graphs). with multiple transceivers, the v + and v C pins may be paralleled into common capacitors. tr2 out; tr1 out (pins 8, 15): driver outputs with rs232 voltage levels. outputs are in a high impedance state when in the shutdown mode or when power is off (v cc = 0v) to allow data line sharing. outputs are fully short-circuit protected from (v C + 30v) to (v + C 30v) with power on, off or in the shutdown mode. typical output breakdowns are greater than 45v and higher applied voltages will not damage the device if moderately current limited. shorting one output will affect output from the other. rec2 in; rec1 in (pins 9, 14): receiver inputs. accepts rs232 voltage levels ( 30v) and has 0.4v of hysteresis to provide noise immunity. input impedance is nominally 5k w . rec2 out; rec1 out (pins 10, 13): receiver outputs with ttl/cmos voltage levels. outputs are in a high impedance state when in the shutdown mode to allow data line sharing. outputs are fully short-circuit protected to ground or v cc with power on, off or in the shutdown mode. tr2 in; tr1 in (pins 11, 12): rs232 driver input pins. inputs are ttl/cmos compatible. inputs should not be allowed to float. tie unused inputs to v cc . gnd (pin 16): ground pin. v cc (pin 17): input supply pin. supply current drops to zero in the shutdown mode. on/off (pin 18): contols the operation mode of the lt1080 and is ttl/cmos compatible. a logic low puts the device in the shutdown mode which reduces input supply current to zero and places both driver and receiver outputs in a high impedance state. a logic high fully enables the device. typical perfor a ce characteristics uw
5 lt1080/lt1081 10801fe typical perfor a ce characteristics uw temperature ( c) 55 25 0 25 50 75 100 125 input threshold (v) 1080/81 g04 3.00 2.75 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 input high input low input voltage (v) 012345 input current ( a) 1080/81 g06 40 35 30 25 20 15 10 5 0 ? ?0 receiver input thresholds receiver output short-circuit current on/off pin current vs voltage temperature ( c) output current (ma) 100 10 1 0.1 1080/81 g05 output sourcing output sinking 55 25 0 25 50 75 100 125 on/off pin thresholds supply current in shutdown driver output leakage in shutdown temperature ( c) 55 25 0 25 50 75 100 125 on/off pin voltage (v) 1080/81 g07 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 maximum off voltage minimum on voltage temperature ( c) supply current (na) 1000 100 10 1 1080/81 g08 v cc = 5v 55 25 0 25 50 75 100 125 temperature ( c) output leakage current ( a) 100 10 1 0.1 1080/81 g09 v out = 30v v out = 30v 55 25 0 25 50 75 100 125 output waveforms shutdown to receiver output 02 m s4 m s6 m s8 m s 0 1ms 2ms 3ms 4ms 0 1ms 2ms 3ms 4ms v cc = 5v 1080/81 g11.tiff v cc = 5v 1080/81 g11.tiff r l = 3k v cc = 5v 1080/81 g10.tiff r l = 3k 5v 0v receiver output low 0v C5v C10 on/off input 10v 5v 0v driver output high input 5v 0v driver output 5v 0v C5v receiver output 5v 0v shutdown to driver output 6v 4v 2v 0v receiver output on/off input 5v 0v
6 lt1080/lt1081 10801fe applicatio s i for atio wu u u the driver output stage of the lt1080 offers significantly improved protection over older bipolar and cmos de- signs. in addition to current limiting, the driver output can be externally forced to 30v with no damage or excessive current flow, and will not disrupt the supplies. some drivers have diodes connected between the outputs and the supplies, so externally applied voltages can cause excessive supply voltage to develop. placing the lt1080 in the shutdown mode (pin 18 low) puts both the driver and receiver outputs in a high imped- ance state. this allows data line sharing and transceiver applications. the shutdown mode also drops input supply current (v cc ; pin 17) to zero for power-conscious systems. 1080/81 f03 lt1080 #1 driver logic transmit/receive line rs232 transmit/receive line logic inverter on/off (transmit/ receive) input lt1080 #2 receiver 30v ?0v output can be forced externally 1080/81 f01 lt1080/lt1081 driver transceiver sharing a receiver line sharing a transmitter line older rs232 drivers and cmos drivers v + v with some drivers, externally applied voltage can force the supplies 1080/81 f02 lt1080 #1 receiver 1080/81 f04 rs232 input a rs232 input b logic output logic inverter on/off (channel select) input lt1080 #2 receiver lt1080 #1 driver logic input a logic input b rs232 transmission line lt1080 #2 driver 1080/81 f05 logic inverter on/off (channel select) input
7 lt1080/lt1081 10801fe applicatio s i for atio wu u u when driving cmos logic from a receiver that will be used in the shutdown mode and there is no other active receiver on the line, a 51k resistor can be placed from the logic input to v cc to force a definite logic level when the receiver output is in a high impedance state. the generated driver supplies (v + and v C ) may be used to power external circuitry such as other rs232 drivers or op amps. they should be loaded with care, since excessive loading can cause the generated supply voltages to drop, causing the rs232 driver output voltages to fall below rs232 requirements. see the graph supply generator outputs for a comparison of generated supply voltage versus supply current. 1080/81 f08 driver v + 3 external op amp lt1080 v v + v 7 1 f 1 f + gnd 16 + typical applicatio u to protect against receiver input overloads in excess of 30v, a voltage clamp can be placed on the data line and still maintain rs232 compatibility. rs232 input receiver logic output 1080/81 f067 5k 1k* 30v 30v * a ptc thermistor will allow continuous overload of greater than 100v operating with 5v and 12v logic inputs logic outputs on/off 18 10 13 11 12 6 5 4 2 16 9 14 8 15 7 3 17 5v input 12v input* ?2v output rs232 output rs232 output rs232 input rs232 input 1080/81 ta03 5k 5k lt1080 1 m f 1 m f * pin 1 used on lt1081. 1080/81 f06 rs232 input on/off input lt1080 receiver cmos logic logic output v cc 51k* * forces logic input state when v on/off is low
8 lt1080/lt1081 10801fe j18 1298 0.015 ?0.060 (0.380 ?1.520) 0.100 (2.54) bsc 0.014 ?0.026 (0.360 ?0.660) 0.045 ?0.065 (1.143 ?1.651) 0.200 (5.080) max 0.125 (3.175) min 0.008 ?0.018 (0.203 ?0.457) 0 ?15 1 2 3 4 56 78 0.220 ?0.310 (5.590 ?7.870) 0.960 (24.384) max 0.005 (0.127) min 16 13 9 10 11 12 14 15 17 18 0.025 (0.635) rad typ 0.300 bsc (0.762 bsc) 0.045 ?0.068 (1.143 ?1.727) full lead option 0.023 ?0.045 (0.584 ?1.143) half lead option corner leads option (4 plcs) note: lead dimensions apply to solder dip/plate or tin plate leads j16 1298 0.015 ?0.060 (0.380 ?1.520) 0.100 (2.54) bsc 0.014 ?0.026 (0.360 ?0.660) 0.045 ?0.065 (1.143 ?1.651) 0.200 (5.080) max 0.125 (3.175) min 0.008 ?0.018 (0.203 ?0.457) 0 ?15 1 23 4 5 6 78 0.220 ?0.310 (5.588 ?7.874) 0.840 (21.336) max 0.005 (0.127) min 16 13 9 10 11 12 14 15 0.025 (0.635) rad typ 0.300 bsc (0.762 bsc) 0.045 ?0.068 (1.143 ?1.727) full lead option 0.023 ?0.045 (0.584 ?1.143) half lead option corner leads option (4 plcs) note: lead dimensions apply to solder dip/plate or tin plate leads package descriptio u j package 16-lead cerdip (narrow .300 inch, hermetic) (reference ltc dwg # 05-08-1110) j package 18-lead cerdip (narrow .300 inch, hermetic) (reference ltc dwg # 05-08-1110) obsolete packages
9 lt1080/lt1081 10801fe package descriptio u n18 1098 0.020 (0.508) min 0.125 (3.175) min 0.130 0.005 (3.302 0.127) 0.065 (1.651) typ 0.045 ?0.065 (1.143 ?1.651) 0.018 0.003 (0.457 0.076) 0.005 (0.127) min 0.100 (2.54) bsc 0.255 0.015* (6.477 0.381) 0.900* (22.860) max 18 12 3 4 56 7 8 9 10 11 12 13 14 16 15 17 0.009 ?0.015 (0.229 ?0.381) 0.300 ?0.325 (7.620 ?8.255) 0.325 +0.035 0.015 +0.889 0.381 8.255 () *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch (0.254mm) n package 16-lead pdip (narrow .300 inch) (reference ltc dwg # 05-08-1510) n package 18-lead pdip (narrow .300 inch) (reference ltc dwg # 05-08-1510) n16 1098 0.255 0.015* (6.477 0.381) 0.770* (19.558) max 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0.020 (0.508) min 0.125 (3.175) min 0.130 0.005 (3.302 0.127) 0.065 (1.651) typ 0.045 ?0.065 (1.143 ?1.651) 0.018 0.003 (0.457 0.076) 0.100 (2.54) bsc 0.009 ?0.015 (0.229 ?0.381) 0.300 ?0.325 (7.620 ?8.255) 0.325 +0.035 0.015 +0.889 0.381 8.255 () *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch (0.254mm)
10 lt1080/lt1081 10801fe package descriptio u s16 (wide) 1098 note 1 0.398 ?0.413* (10.109 ?10.490) 16 15 14 13 12 11 10 9 1 23 4 5 6 78 0.394 ?0.419 (10.007 ?10.643) 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) bsc 0.014 ?0.019 (0.356 ?0.482) typ 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) 45 0.010 ?0.029 (0.254 ?0.737) 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 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 * ** sw package 16-lead plastic small outline (wide .300 inch) (reference ltc dwg # 05-08-1620)
11 lt1080/lt1081 10801fe 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. package descriptio u s18 (wide) 1098 note 1 0.447 ?0.463* (11.354 ?11.760) 15 14 13 12 11 10 16 9 1 23 4 5 6 78 0.394 ?0.419 (10.007 ?10.643) 17 18 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) bsc 0.014 ?0.019 (0.356 ?0.482) typ 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) 45 0.010 ?0.029 (0.254 ?0.737) 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 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 * ** sw package 18-lead plastic small outline (wide .300 inch) (reference ltc dwg # 05-08-1620)
12 lt1080/lt1081 10801fe lt/cpi 1101 1.5k rev e ? printed in usa 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 1991 typical applicatio u supporting an lt1039 (triple driver/receiver) 30k 30k rs232 output rs232 output rs232 input rs232 input 1080/81 ta02 lt1039 ttl input 30k rs232 input v cc ttl input ttl input ttl output ttl output ttl output on/off rs232 output 5k rs232 output rs232 input lt1080 ttl input 5k rs232 input v cc ttl input ttl output ttl output on/off rs232 output 1 m f 2 *c1 4 1 m f 5 6 3 7 18 17 1 m f 1 m f gnd 16 gnd 10 v + v 1 9 18 17 5v shutdown c2 c2 + c1 c1 + v + v *in applications where a separate second positive supply is available (such as 5v and 12v), the 12v supply may be connected to pin 2 and c1 deleted. the power supply circuitry will then invert the 12v supply. the 5v supply is still needed to power the biasing circuitry and receivers. part number description comments lt1180a/lt1181a 5v low power 2dr/2tx rs232 transceiver 0.1 m f capacitors, 10kv esd lt1780/lt1781 5v low power 2dr/2tx rs232 transceiver 15kv esd lt1381 5v low power 2dr/2tx rs232 transceiver 16-pin narrow so package lt1130a/lt1140a 5v rs232 transceivers up to 5dr/5rx ltc1383 5v low power 2dr/2rx rs232 transceiver low supply current i cc = 220 m a ltc1386 3.3v low power eia/tia562 transceiver low supply current i cc = 200 m a related parts

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