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1 ltc1321/ltc1322/ltc1335 rs232/eia562/rs485 transceivers s f ea t u re the ltc1321/ltc1322/ltc1335 are low power cmos bidirectional transceivers, each featuring two reconfigurable interface ports. each can be configured as two rs485 differential ports, as two single-ended ports, or as one rs485 differential port and one single-ended port. the ltc1321/ltc1322 can provide rs232 or eia562 compat- ible single-ended outputs; the ltc1335 provides eia562 compatible outputs and additionally includes an output enable pin, allowing the receiver logic level outputs to be three-stated. the rs232/eia562 transceivers operate to 120kbaud and are in full compliance with eia/tia-562 specification. the rs485 transceivers operate to 10mbaud and are in full compliance with rs485 and rs422 specifications. all interface drivers feature short-circuit and thermal shut- down protection. an enable pin allows rs485 driver outputs to be forced into high impedance which is main- tained even when the outputs are forced beyond supply rails or power is off. both driver outputs and receiver inputs feature 10kv esd protection. a loopback mode connects the driver outputs back to the receiver inputs for diagnostic self-test. the ltc1321/ltc1322 can support rs232 voltage levels when 6.5v v dd 10v and C 6.5v 3 v ee 3 C 10v. the ltc1335 supports receiver output enable but not rs232 levels. a shutdown mode reduces the i cc supply current to 15 m a. d u escriptio applicatio n s u n low power rs485/rs422/eia562/rs232 interface n cable repeater n level translator n ltc1321: 2-eia562/rs232 transceivers/2-rs485 transceivers n ltc1322: 4-eia562/rs232 transceivers/2-rs485 transceivers n ltc1335: 4-eia562 transceivers/2-rs485 transceivers with oe n ltc1321/ltc1322 have the same pinout as sp301/sp302 n ltc1335 features receiver three-state outputs n low supply current: 1ma typical n 15 m a supply current in shutdown n 120kbaud in eia/tia-562 or rs232 mode n 10mbaud in rs485/rs422 mode n self-testing capability in loopback mode n power-up/down glitch-free outputs n driver maintains high impedance in three-state, shutdown or with power off n thermal shutdown protection n i/o lines can withstand 25v n withstands repeated 10kv esd pulses u a o pp l ic at i ty p i ca l 19 5v 6 5v 7 5v 18 0v 1 24 v cc2 5v 1 24 v cc1 5v 120 w 2 ltc1322 1321/22/35 ta01 rx out 21 rs485 interface dr enable 3 4 5 12 22 dr in 20 13 v ee1 ?v 11 19 ltc1322 rx out 16 5v dr enable 10 9 8 7 6 12 15 dr in 17 5v 18 13 v ee2 ?v 120 w 4000-ft 24-gauge twisted pair 5v 0v 8 dr in 17 3 22 rx out 11 14 rx out 4 dr in 21 eia562 interface 9 dr in 16 2 23 rx out 10 15 rx out 5 dr in 20
2 ltc1321/ltc1322/ltc1335 a u g w a w u w a r b s o lu t exi t i s supply voltage v cc .................................................................... 6.5v v dd (ltc1321/ltc1322 only) ........................... 10v v ee ................................................................... C 10v input voltage drivers ................................... C 0.3v to (v cc + 0.3v) receivers ............................................. C 25v to 25v on/off, lb, sel1, sel2, oe ............................ C 0.3v to (v cc + 0.3v) output voltage drivers ................................................. C 25v to 25v receivers ............................... C 0.3v to (v cc + 0.3v) output short-circuit duration ......................... indefinite operating temperature range ltc1321c/ltc1322c/ltc1335c ......... 0 c to 70 c ltc1321i/ltc1322i/ltc1335i ......... C 40 c to 85 c storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec)................ 300 c wu u package / o rder i for atio 2 rs485 drivers/receivers 2 eia/tia-562 drivers/receivers 2 rs485 drivers/receivers 4 eia/tia-562 drivers/receivers 2 rs485 drivers/receivers 4 eia/tia-562 drivers/receivers 1 2 3 4 5 6 7 8 9 10 11 12 top view s package 24-lead plastic sol 24 23 22 21 20 19 18 17 16 15 14 13 v dd b1 a1 z1 y1 sel1 sel2 y2 z2 a2 b2 gnd v cc nc r a1 de1 d y1 lb on/off d y2 de2 r a2 nc v ee n package 24-lead plastic dip 1 2 3 4 5 6 7 8 9 10 11 12 top view 24 23 22 21 20 19 18 17 16 15 14 13 v dd b1 a1 z1 y1 sel1 sel2 y2 z2 a2 b2 gnd v cc r b1 r a1 d z1 /de1 d y1 lb on/off d y2 d z2 /de2 r a2 r b2 v ee s package 24-lead plastic sol n package 24-lead plastic dip 1 2 3 4 5 6 7 8 9 10 11 12 top view 24 23 22 21 20 19 18 17 16 15 14 13 oe b1 a1 z1 y1 sel1 sel2 y2 z2 a2 b2 gnd v cc r b1 r a1 d z1 /de1 d y1 lb on/off d y2 d z2 /de2 r a2 r b2 v ee s package 24-lead plastic sol n package 24-lead plastic dip t jmax = 125 c, q ja = 75 c/w (n) t jmax = 125 c, q ja = 85 c/w (s) t jmax = 125 c, q ja = 75 c/w (n) t jmax = 125 c, q ja = 85 c/w (s) t jmax = 125 c, q ja = 75 c/w (n) t jmax = 125 c, q ja = 85 c/w (s) order part number order part number order part number ltc1321cn ltc1321cs ltc1321in ltc1321is ltc1335cn ltc1335cs ltc1335in ltc1335is ltc1322cn ltc1322cs ltc1322in ltc1322is consult factory for military grade parts.
3 ltc1321/ltc1322/ltc1335 dc electrical characteristics v cc = v dd (ltc1321/ltc1322) = 5v 5%, v ee = C 5v 5% (notes 2, 3) symbol parameter conditions min typ max units rs485 driver (sel1 = sel2 = high) v od1 differential driver output voltage (unloaded) i o = 0 l 5v v od2 differential driver output voltage (with load) figure 1, r = 50 w (rs422) l 2.0 5 v figure 1, r = 27 w (rs485) l 1.5 5 v d v od change in magnitude of driver differential figure 1, r = 27 w or r = 50 w l 0.2 v output voltage for complementary output states v oc driver common-mode output voltage figure 1, r = 27 w or r = 50 w l 3v d? v oc ? change in magnitude of driver common-mode figure 1, r = 27 w or r = 50 w l 0.2 v output voltage for complementary output states i osd driver short-circuit current C 7v v o 12v, v o = high l 35 250 ma C 7v v o 12v, v o = low (note 4) l 10 250 ma i ozd three-state output current (y, z) C 7v v o 12v l 5 500 m a eia/tia-562 driver (sel1 = sel2 = low) v o output voltage swing figure 4, r l = 3k, positve l 3.7 4.2 v figure 4, r l = 3k, negative l C 3.7 C 4.3 v i osd output short-circuit current v o = 0v l 11 60 ma driver inputs and control inputs v ih input high voltage d, de, on/off, sel1, sel2, lb l 2v oe (ltc1335) l 2v v il input low voltage d, de, on/off, sel1, sel2, lb l 0.8 v oe (ltc1335) l 0.8 v i in input current d, sel1, sel2 l 10 m a de, on/off, lb l C4 C15 m a oe (ltc1335) l 4 15 m a rs485 receiver (sel1 = sel2 = high) v th differential input threshold voltage C 7v v cm 7v, commercial l C 0.2 0.2 v C 7v v cm 7v, industrial l C 0.3 0.3 v d v th input hysteresis v cm = 0v l 70 mv i in input current (a, b) C 7v v in 12v l 1ma r in input resistance C 7v v in 12v l 12 24 k w eia/tia-562 receiver (sel1 = sel2 = low) v th receiver input voltage threshold input low threshold l 0.8 1.1 v input high threshold l 1.7 2.4 v d v th receiver input hysteresis l 0.1 0.6 1.0 v r in receiver input resistance v in = 10v 3 5 7 k w receiver output v oh receiver output high voltage i o = C 3ma, v in = 0v, sel1 = sel2 = low l 3.5 4.6 v v ol receiver output low voltage i o = 3ma, v in = 3v, sel1 = sel2 = low l 0.2 0.4 v i osr short-circuit current 0v v o v cc l 785ma i ozr three-state output current on/off = 0v l 10 m a oe = v cc (ltc1335) l 10 m a
4 ltc1321/ltc1322/ltc1335 dc electrical characteristics symbol parameter conditions min typ max units supply currents i cc v cc supply current no load (sel1 = sel2 = high) l 1000 2000 m a shutdown, on/off = 0v l 15 50 m a i dd v dd supply current (ltc1321/ltc1322) no load (sel1 = sel2 = low) l 300 1000 m a shutdown, on/off = 0v l 0.1 50 m a i ee v ee supply current no load (sel1 = sel2 = high) l C 1000 C 2000 m a shutdown, on/off = 0v l C 0.1 C 50 m a dc electrical characteristics v cc = v dd (ltc1321/ltc1322) = 5v 5%, v ee = C 5v 5% (notes 2, 3) ac v cc = v dd (ltc1321/ltc1322) = 5v 5%, v ee = C 5v 5% (notes 2, 3) symbol parameter conditions min typ max units eia/tia-562 mode (sel1 = sel2 = low) sr slew rate figure 4, r l = 3k, c l = 15pf l 14 30 v/ m s figure 4, r l = 3k, c l = 1000pf l 47 v/ m s t t transition time figure 4, r l = 3k, c l = 2500pf l 0.22 1.9 3.1 m s t plh driver input to output figures 4,10, r l = 3k, c l = 15pf l 0.6 4 m s t phl driver input to output figures 4,10, r l = 3k, c l = 15pf l 0.6 4 m s t plh receiver input to output figures 5,11 l 0.3 6 m s t phl receiver input to output figures 5,11 l 0.4 6 m s rs485 mode (sel1 = sel2 = high) t plh driver input to output figures 2,7, r l = 54 w , c l = 100pf l 20 40 70 ns t phl driver input to output figures 2,7, r l = 54 w , c l = 100pf l 20 40 70 ns t skew driver output to output figures 2,7, r l = 54 w , c l = 100pf l 515 ns t r , t f driver rise or fall time figures 2,7, r l = 54 w , c l = 100pf l 31540 ns t zl driver enable to output low figures 3,8, c l = 100pf, s1 closed l 50 90 ns t zh driver enable to output high figures 3,8, c l = 100pf, s2 closed l 50 90 ns t lz driver disable from low figures 3,8, c l = 15pf, s1 closed l 50 90 ns t hz driver disable from high figures 3,8, c l = 15pf, s2 closed l 60 90 ns t plh receiver input to output figures 2,9, r l = 54 w , c l = 100pf l 20 60 140 ns t phl receiver input to output figures 2,9, r l = 54 w , c l = 100pf l 20 70 140 ns t skew differential receiver skew, ? t plh -t phl ? figures 2,9, r l = 54 w , c l = 100pf l 10 ns receiver output enable/disable (ltc1335) t zl receiver enable to output low figures 6,12, c l = 15pf, s1 closed l 40 90 ns t zh receiver enable to output high figures 6,12, c l = 15pf, s2 closed l 40 90 ns t lz receiver disable from low figures 6,12, c l = 15pf, s1 closed l 40 90 ns t hz receiver disable from high figures 6,12, c l = 15pf, s2 closed l 50 90 ns the l denotes specifications which apply over the full operating temperature range. note 1: absolute maximum ratings are those values beyond which the safety of the device cannot be guaranteed. note 2: all currents into device pins are positive; all currents out of device pins are negative. all voltages are referenced to device ground unless otherwise specified. note 3: all typicals are given at v cc = v dd (ltc1321/ltc1322) = 5v, v ee = C 5v, and t a = 25 c. note 4: short-circuit current for rs485 driver output low state folds back above v cc . peak current occurs around v o = 3v.
5 ltc1321/ltc1322/ltc1335 rs485 driver differential output voltage vs temperature temperature (?) ?0 differential output voltage (v) 2.6 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 0 50 75 1321 g01 ?5 25 100 125 r l = 54 w rs485 driver output high voltage vs output current eia562 driver output voltage vs temperature output voltage (v) 0 output current (ma) 3 5 1321 g04 12 4 80 70 60 50 40 30 20 10 0 t a = 25? temperature (?) ?0 output voltage (v) 5 4 3 2 1 0 ? ? ? ? ? 0 50 75 1321 g07 ?5 25 100 125 r l = 3k output high output low typical perfor m a n ce characteristics u w temperature (?) ?0 time ( m s) 15 12 9 6 3 0 0 50 75 1321 g03 ?5 25 100 125 rs485 driver skew vs temperature eia562 driver output short-circuit current vs temperature temperature (?) ?0 output short-circuit current (ma) 18 16 14 12 10 8 6 25 75 1321 g09 ?5 0 50 100 125 source v out = 0v sink differential output voltage (v) 0 70 60 50 40 30 20 10 0 34 1321 g02 12 5 differential output current (ma) t a = 25? rs485 driver differential output current vs output voltage output voltage (v) 0 output current (ma) 120 100 80 60 40 20 0 1234 1321 g05 5 t a = 25? rs485 driver output low voltage vs output current eia562 driver output voltage vs supply voltage v dd supply voltage (v) 4 output voltage (v) 5 6 78 1321 g08 9 10 8 6 4 2 0 ? ? ? ? ?0 10 r l = 3k t a = 25? v ee = v dd output high output low rs485 driver output short-circuit current vs temperature temperature (?) ?0 output short-circuit current (ma) 160 140 120 100 80 60 40 25 75 1321 g19 ?5 0 50 100 125 source (v out = 0v) sink (v out = 5v)
6 ltc1321/ltc1322/ltc1335 typical perfor m a n ce characteristics u w rs485 receiver ? t plh C t phl ? vs temperature receiver output low voltage vs temperature output voltage (v) 0 0.5 output current (ma) 1.0 2.0 1.5 2.5 3.0 1321 g14 40 35 30 25 20 15 10 5 0 t a = 25? receiver output current vs output low voltage eia562 receiver input threshold voltage vs temperature temperature (?) ?0 input threshold voltage (v) 2.0 1.8 1.6 1.4 1.2 1.0 0.8 25 75 1321 g15 ?5 0 50 100 125 input high input low temperature (?) ?0 supply current ( m a) 500 450 400 350 300 250 200 150 100 50 0 0 50 75 1321 g18 ?5 25 100 125 i cc ? ee ? dd r l = supply current in eia562 mode vs temperature (both ports) supply current in rs485 mode vs temperature (both ports) temperature (?) ?0 supply current (ma) 1.2 1.0 0.8 0.6 0.4 0.2 0 25 75 1321 g17 ?5 0 50 100 125 i cc ? ee ? dd r l = temperature (?) ?0 time (ns) 20 18 16 14 12 10 8 6 4 2 0 0 50 75 1321 g12 ?5 25 100 125 temperature (?) ?0 output voltage (v) 0.5 0.4 0.3 0.2 0.1 0 0 50 75 1321 g11 ?5 25 100 125 i out = 3ma temperature (?) ?0 output leakage current ( m a) 100 1321 g06 050 400 350 300 250 200 150 100 50 0 25 25 75 125 driver output leakage current (disable/shutdown) vs temperature output voltage (v) 2.0 output current (ma) 2.5 3.0 3.5 4.0 1321 g13 4.5 120 18 16 14 12 10 8 6 4 2 0 5.0 t a = 25? receiver output current vs output high voltage receiver output high voltage vs temperature temperature (?) ?0 output voltage (v) 5.0 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 0 50 75 1321 g10 ?5 25 100 125 i out = 3ma
7 ltc1321/ltc1322/ltc1335 v dd (pin 1): positive supply input for eia/tia-562 drivers. b1: (pin 2): receiver input. a1 (pin 3): receiver input. z1 (pin 4): driver output. y1 (pin 5): driver output. sel1 (pin 6): interface mode select input. sel2 (pin 7): interface mode select input. y2 (pin 8): driver output. z2 (pin 9): driver output. a2 (pin 10) : receiver input. b2 (pin 11): receiver input. gnd (pin 12): ground. v ee (pin 13): negative supply. nc (pin 14): no connection. r a2 (pin 15): receiver output. de2 (pin 16): driver enable with internal pull-up in rs485 mode. d y2 (pin 17): driver input. on/off (pin 18): a high logic input enables the trans- ceivers. a low puts the device into shutdown mode and reduces i cc to 15 m a. this pin has an internal pull-up. lb (pin 19): loopback control input. a low logic level enables loopback connections. this pin has an internal pull-up. d y1 (pin 20): driver input. de1 (pin 21): driver enable with internal pull-up in rs485 mode. r a1 (pin 22): receiver output. nc (pin 23): no connection. v cc (pin 24): positive supply; 4.75v v cc 5.25v. oe/v dd (pin 1): for ltc1335, pin 1 is the receiver output enable with internal pull-down. for ltc1322, pin 1 is the positive supply input for eia/tia-562 drivers. b1: (pin 2): receiver input. a1 (pin 3): receiver input. z1 (pin 4): driver output. y1 (pin 5): driver output. sel1 (pin 6): interface mode select input. sel2 (pin 7): interface mode select input. y2 (pin 8): driver output. z2 (pin 9): driver output. a2 (pin 10) : receiver input. b2 (pin 11): receiver input. gnd (pin 12): ground. v ee (pin 13): negative supply. r b2 (pin 14): receiver output. r a2 (pin 15): receiver output. d z2 /de2 (pin 16): eia/tia-562 driver input in eia562 mode. rs485 driver enable with internal pull-up in rs485 mode. d y2 (pin 17): driver input. on/off (pin 18): a high logic input enables the transceivers. a low puts the device into shutdown mode and reduces i cc to 15 m a. this pin has an internal pull-up. lb (pin 19): loopback control input. a low logic level enables loopback connections. this pin has an internal pull-up. d y1 (pin 20): driver input. d z1 /de1 (pin 21): eia/tia-562 driver input in eia562 mode. rs485 driver enable with internal pull-up in rs485 mode. r a1 (pin 22): receiver output. r b1 (pin 23): receiver output. v cc (pin 24): positive supply; 4.75v v cc 5.25v. pi fu ctio s u uu ltc1321 ltc1322/ltc1335
8 ltc1321/ltc1322/ltc1335 rs485 receiver mode inputs output on/off sel a C b r 1 1 < C 0.2v 0 1 1 > 0.2v 1 1 1 inputs open 1 01 xz rs485 receiver mode inputs output on/off sel a C b r 1 1 < C 0.2v 0 1 1 > 0.2v 1 1 1 inputs open 1 01 xz rs485 driver mode inputs line outputs on/off sel de d condition y z 1 1 1 0 no fault 0 1 1 1 1 1 no fault 1 0 1 1 1 x fault z z 110x x zz 01xx x zz rs485 driver mode inputs line outputs on/off sel de d condition y z 1 1 1 0 no fault 0 1 1 1 1 1 no fault 1 0 1 1 1 x fault z z 110x x zz 01xx x zz fu ctio tables uu ltc1321 ltc1322 rs232/eia562 driver mode inputs line output on/off sel d condition y 1 0 0 no fault 1 1 0 1 no fault 0 1 0 x fault z 00x x z rs232/eia562 driver mode inputs line output on/off sel d condition y, z 1 0 0 no fault 1 1 0 1 no fault 0 1 0 x fault z 00x x z rs232/eia562 receiver mode inputs output on/off sel a r 10 01 10 10 1 0 inputs open 1 00 xz rs232/eia562 receiver mode inputs output on/off sel a or b r 10 01 10 10 1 0 input open 1 00 xz
9 ltc1321/ltc1322/ltc1335 fu ctio tables uu ltc1321 interface configuration without loopback 1321bd01 r a1 v cc v dd a1 d y1 on * sel1/sel2 = v cc y1 port 1 = eia562 mode port 2 = eia562 mode d y2 y2 sel1 sel2 24 22 1 3 5 6 7 8 20 19 lb 18 17 gnd v ee 12 13 r a2 a2 10 15 port 1 = rs485 mode port 2 = rs485 mode v dd b1 a1 z1 y1 1 2 3 4 5 6 7 8 9 12 10 11 d y1 6 r a1 v cc v dd b1 a1 de1 on z1 y1 port 1 = rs485 mode port 2 = eia562 mode d y2 y2 *sel1 sel2 24 22 1 2 3 5 4 7 8 21 20 lb 18 19 17 gnd v ee 12 13 r a2 a2 10 15 d y1 r a1 v cc de1 on d y2 de2 24 22 21 20 lb 17 19 18 16 v ee 13 r a2 15 r a1 v cc v dd a1 d y1 on de2 y1 port 1 = eia562 mode port 2 = rs485 mode d y2 sel1 24 22 1 3 5 6 7 8 9 20 19 lb 18 17 1 16 12 13 10 11 15 y2 z2 gnd v ee r a2 b2 a2 y2 z2 a2 gnd b2 *sel2 *sel2 *sel1 rs485 receiver mode output on/off sel oe a C b r 1 1 0 < C 0.2v 0 1 1 0 > 0.2v 1 1 1 0 inputs open 1 111 x z 01x x z rs485 driver mode inputs line outputs on/off sel de d condition y z 1 1 1 0 no fault 0 1 1 1 1 1 no fault 1 0 1 1 1 x fault z z 110x x zz 01xx x zz inputs ltc1335 block diagra s m w eia562 driver mode inputs line output on/off sel d condition y, z 1 0 0 no fault 1 1 0 1 no fault 0 1 0 x fault z 00x x z inputs eia562 receiver mode output on/off sel oe a or b r 100 0 1 100 1 0 1 0 0 input open 1 101 x z 00x x z
10 ltc1321/ltc1322/ltc1335 ltc1321 interface configuration with loopback ltc1322/ltc1335 interface configuration without loopback r a1 port 1 = eia562 mode port 2 = eia562 mode a2 b2 23 d y2 17 14 r b2 port 1 = rs485 mode port 2 = rs485 mode d y1 5 6 v cc on de1 b1 a1 z1 y1 port 1 = rs485 mode port 2 = eia562 mode d z2 y2 z2 **sel1 sel2 24 3 4 2 7 8 9 10 11 22 21 20 lb 18 19 16 gnd v ee 12 12 13 r a2 15 port 1 = eia562 mode port 2 = rs485 mode 1 *v dd /oe * r b1 r b1 r a1 v cc d z1 d y1 on z1 a1 b1 d y2 d z2 z2 y2 a2 sel1 sel2 23 24 1 4 2 3 6 7 8 9 21 22 19 lb 18 17 gnd v ee 10 b2 11 15 14 13 r a2 r b2 16 y1 5 20 *v dd /oe * 12 r b1 r a1 v cc d z1 d y1 on z1 a1 b1 d y2 de2 z2 y2 a2 sel1 **sel2 23 24 1 4 2 3 6 7 8 9 21 22 19 lb 18 17 gnd v ee 10 b2 11 15 14 13 r a2 r b2 16 y1 5 20 *v dd /oe * 12 1322/35 bd01 r a1 v cc de1 d y1 on z1 a1 b1 d y2 de2 z2 y2 a2 **sel2 23 24 1 4 2 3 6 7 8 9 21 22 19 lb 18 17 gnd v ee 10 b2 11 15 14 13 r a2 r b2 16 y1 5 20 *v dd /oe * **sel1 r b1 for ltc1322 only, pin 1 is v dd , and oe is always enabled. for ltc1335, pin 1 is oe, and v dd is connected to v cc . sel1/sel2 = v cc . * ** 1321 bd02 r a1 v cc v dd d y1 on y1 port 1 = eia562 mode port 2 = eia562 mode d y2 y2 sel1 sel2 24 22 1 5 6 7 8 20 19 lb 18 17 gnd v ee 12 13 r a2 15 port 1 = rs485 mode port 2 = rs485 mode d y1 6 r a1 v cc v dd de1 on z1 y1 port 1 = rs485 mode port 2 = eia562 mode d y2 y2 *sel1 *sel1/sel2 = v cc sel2 24 22 1 5 4 7 8 21 20 lb 18 19 17 gnd v ee 12 13 r a2 15 r a1 v cc v dd d y1 on de2 y1 port 1 = eia562 mode port 2 = rs485 mode d y2 sel1 24 22 1 5 6 7 8 9 20 19 lb 18 17 16 12 13 15 y2 z2 *sel2 gnd v ee r a2 de2 d y2 7 8 9 17 16 12 13 15 y2 z2 *sel2 gnd v ee r a2 d y1 6 r a1 v cc v dd de1 z1 y1 *sel1 24 22 1 5 4 21 20 lb 19 on 18 block diagra s m w
11 ltc1321/ltc1322/ltc1335 figure 6. receiver output enable/disable timing test load figure 5. eia/tia-562 receiver timing test circuit figure 4. eia/tia-562 driver timing test circuit test circuits figure 3. rs485 driver output enable/disable timing test load figure 2. rs485 driver/receiver timing test circuit figure 1. rs485 driver test load r r v od y z 1321/22/35 f01 v oc dr out c l 500 w s2 1321/22/35 f03 v cc s1 r l 1321/22/35 f04 y or z 0v sel d c l rx out c l 1k s2 1321/22/35 f06 v cc s1 r l c l 1321/22/35 f02 y 3v 3v sel de z c l a sel 3v 0v r b 15pf d oe 1321/22/35 f05 15pf y or z 0v sel d r 0v sel a or b 0v oe r a1 port 1 = eia562 mode port 2 = eia562 mode 23 d y2 17 14 r b2 port 1 = rs485 mode port 2 = rs485 mode d y1 5 6 v cc on de1 z1 y1 port 1 = rs485 mode port 2 = eia562 mode d z2 y2 z2 sel2 24 4 7 8 9 22 21 20 lb 18 19 16 gnd v ee 12 13 r a2 15 port 1 = eia562 mode port 2 = rs485 mode 1 *v dd /oe * r b1 r b1 r a1 v cc d z1 d y1 on z1 d y2 d z2 z2 y2 sel1 sel2 23 24 1 4 6 7 8 9 21 22 19 lb 18 17 gnd v ee 15 14 13 r a2 r b2 16 y1 5 20 *v dd /oe * 12 r b1 r a1 v cc d z1 d y1 on z1 d y2 de2 z2 y2 sel1 23 24 1 4 6 7 8 9 21 22 19 lb 18 17 gnd v ee 15 14 13 r a2 r b2 16 y1 5 20 *v dd /oe * 12 r a1 v cc de1 d y1 on z1 d y2 de2 z2 y2 23 24 1 4 6 7 8 9 21 22 19 lb 18 17 gnd v ee 15 14 13 r a2 r b2 16 y1 5 20 *v dd /oe * r b1 1322/35 bd02 12 **sel1 **sel2 **sel2 **sel1 for ltc1322 only, pin 1 is v dd , and oe is always enabled. for ltc1335, pin 1 is oe, and v dd is connected to v cc . sel1/sel2 = v cc . * ** ltc1322/ltc1335 interface configuration with loopback block diagra s m w
12 ltc1321/ltc1322/ltc1335 figure 7. rs485 driver propagation delays figure 9. rs485 receiver propagation delays 0v v od2 a ?b f = 1mhz: t r 10ns: t f 10ns 1.5v r v ol v oh 1321/22/35 f09 t plh t phl input v od2 output 0v 1.5v 3v d y or z ? o v o 1321/22/35 f10 t phl t plh 0v 0v 0v 1.5v 1.5v 1.5v 3v 0v d f = 1mhz: t r 10ns: t f 10ns 1.5v y z ? o v o t skew 1/2 v o 1321/22/35 f07 t plh t r 90% 50% 10% t phl t f 90% 50% 10% v o t skew v diff = v(y) ?v(z) z y switchi g wavefor s u w figure 10. eia/tia-562 driver propagation delays 1.5v 3v 0v de f = 1mhz: t r 10ns: t f 10ns 1.5v y or z v ol 5v t zl t lz 0.5v output normally low 0v 1321/22/35 f08 2.3v 2.3v t zh v oh output normally high t hz 0.5v y or z figure 8. rs485 driver enable and disable times
13 ltc1321/ltc1322/ltc1335 switchi g wavefor s u w figure 12. receiver enable and disable times u s a o pp l ic at i wu u i for atio basic theory of operation the ltc1321/ltc1322/ltc1335 each have two interface ports. each port may be configured as single-ended eia562 transceiver(s) or differential rs485 transceiver by forcing the ports selection input to a low or high, respectively. the ltc1321 provides one eia562 driver and one eia562 receiver per port to maintain same pinout as sp301. the ltc1322 and ltc1335 each provide two drivers and two receivers per port. additionally, the ltc1321 and ltc1322 single-ended ports are rs232 compatible with higher v dd and v ee supply levels. all the interface drivers feature three-state outputs. inter- face outputs are forced into high impedance when the driver is disabled, in the shutdown mode, or with the power off. all the interface driver outputs are fault protected by a current limiting and thermal shutdown circuit. the thermal shutdown circuit disables both the eia562 and rs485 driver outputs when the die temperature reaches 150 c. the thermal shutdown circuit enables the drivers when the die temperature cools to 135 c. in rs485 mode, shutdown mode or with the power off, the input resistance of the receiver is 24k. the input resistance drops to 6.3k in eia562 mode. a logic low at the on/off pin shuts down the device and forces all the outputs into a high impedance state. a logic high enables the device. an internal 4 m a current source to v cc pulls the on/off pin high if left open. in rs485 mode, an internal 4 m a current source pulls the driver enable pin high if left open. the rs485 receiver has a 4 m a current source at the noninverting input. if both the rs485 receiver inputs are open, the output is a high state. both the current sources are disabled in the eia562 mode. for ltc1335, a logic low at the oe pin enables all the receiver outputs and a logic high disables all the receiver outputs. an internal 4 m a current source pulls the oe pin low if left open. a loopback mode enables internal connections from driver outputs to receiver inputs for self-test when the 1.5v 3v 0v oe f = 1mhz: t r 10ns: t f 10ns 1.5v r v ol 5v t zl t lz 0.5v output normally low 0v 1321/22/35 f12 1.5v 1.5v t zh v oh output normally high t hz 0.5v r figure 11. eia/tia-562 receiver propagation delays v ih a or b r v ol v oh 1321/22/35 f11 t phl t plh v il 2.4v 0.8v 1.3v 1.7v
14 ltc1321/ltc1322/ltc1335 1 24 v cc 5v 1321/22/35 f13 120 w 11 19 ltc1321 ltc1322 ltc1335 rx out 16 5v 10 9 8 7 6 12 15 14 rs485 i/o eia562 dr out 17 5v 18 13 v ee ?v 5v 0v 3 22 rx out 4 eia562 rx in (ltc1322/ltc1335 only) 21 2 rx out 5 dr in dr enable dr in dr in 20 eia562 dr out (ltc1322/ltc1335 only) ltc1321/ltc1322 only eia562 rx in v dd (ltc1321/ltc1322) or oe (ltc1335) 0.1 m f 0.1 m f 1 24 v cc 5v v 12v v + 12v 1321/22/35 f14 120 w 0.1 m f 0.1 m f 0.1 m f 11 19 ltc1321 ltc1322 rx out 16 5v 10 9 8 7 6 12 15 14 rs485 i/o *optional rs232 dr out 17 5v z3* 1n5246b 16v 18 13 v ee 5v 0v 3 22 rx out 4 rs232 rx in (ltc1322 only) 21 2 rx out 5 dr in dr enable dr in dr in 20 rs232 dr out (ltc1322 only) rs232 rx in v dd z1 1n5229b 4.3v z2 1n5229b 4.3v figure 13. eia562/rs485 interfaces with 5v supplies figure 14. rs232/rs485 interfaces with 5v, 12v supplies localtalk and appletalk are registered trademarks of apple computer, inc. lb pin has a low logic state. the driver outputs are not isolated from the external loads. this allows transmitter verification under the loaded condition. an internal 4 m a current source pulls the lb pin high if left open and disables the loopback configuration. eia562/rs485 applications eia562 and rs485 output levels are supported when ltc1321/ltc1322/ltc1335 are powered from 5v sup- plies. the ltc1321/ltc1322 require the v dd and v cc pins to be tied together and connected to 5v supply (figure 13). the v dd and v cc are connected internally and brought out at v cc pin in the ltc1335. the unloaded outputs will swing from C 5v to 5v in eia562 mode, and from 0v to 5v in rs485 mode. rs232/rs485 applications if true rs232-compatible outputs are required, the ltc1321/ltc1322 may be used with the v dd and v ee supply voltages increased to provide the additional signal swing. to meet rs232, v dd must be between 6.5v and 10v, and v ee must be between C 6.5v and C 10v. v cc remains connected to 5v. if only 12v supplies are avail- able, inexpensive zener diodes (z1 and z2) may be con- nected in series with v dd and v ee supply pins as shown in figure 14. an optional 16v zener diode between v cc and v ee is recommended to keep the maximum voltage be- tween v cc and v ee within safe limits. localtalk ? /appletalk ? applications the ltc1321/ltc1322/ltc1335 can be used to provide appletalk/localtalk-compatible signals in rs485 mode. figure 15 shows one half of an ltc1335 connected to an ltc1320 appletalk transceiver in a typical localtalk configuration. figure 16 shows a typical direct-wire con- nection with the ltc1335 as the dce transceiver and the ltc1320 as the dte transceiver. the ltc1321/ltc1322/ ltc1335 rs485 mode is capable of meeting all appletalk protocol specifications. u s a o pp l ic at i wu u i for atio
15 ltc1321/ltc1322/ltc1335 u s a o pp l ic at i wu u i for atio 5v 5v 18 10 1 24 5v 1 txd rxd txd + rxd + 120 w 2 ltc1320 1321/22/35 f15 txd txi 7 3 4 1k 1k 13 12 rxen 5 6 19 ltc1335 16 r a1 2 3 8 7 6 11 12 15 de1 d y1 17 5v 5v 18 14 13 ?v 120 w 22 w 100pf 22 w sel1, 5v sel2, 5v 1k 1k 17 9 22 11 4 21 8 9 16 10 23 14 15 rxo rxo rxdo 5 20 oe rfi rfi rfi rfi rfi rfi rfi txden = rfi rfi figure 15. apple localtalk implemented using ltc1320 and ltc1335 transceivers 5v ?v 18 10 1 24 5v 1 txd rxd rxi txd + rxd + 2 ltc1320 1321/22/35 f16 txd txi 7 3 4 13 12 5 6 19 ltc1335 16 r a1 r a2 2 3 8 7 6 11 12 15 de1 d y1 d y2 d z2 17 5v 5v 18 14 13 ?v 22 w 100pf 22 w sel1, 5v sel2 17 9 22 11 421 8 9 16 10 23 14 15 rxo rxdo 5 20 oe rfi rfi txden rxen txo rxi rxo = 120 w 120 w 120 w 120 w rfi rfi rfi rfi rfi rfi rfi rfi rfi rfi rfi rfi rfi figure 16. appletalk direct connect using ltc1320 for dte and ltc1335 for dce transceivers
16 ltc1321/ltc1322/ltc1335 u s a o pp l ic at i ty p i ca l a typical eia562/rs232 interface application is shown in figure 17 with ltc1322. a typical eia562 interface appli- cation with ltc1335 is shown in figure 18. a typical connection for rs485 transceiver is shown in figure 19. a twisted pair of wires connects up to 32 drivers and receivers for half duplex multi-point data transmis- sion. the wires must be terminated at both ends with resistors equal to the wires characteristic impedance, generally 120 w . an optional shield around the twisted pair helps to reduce unwanted noise and should be connected to ground at one end. 1/2 ltc1322 1/2 ltc1322 1321/22/35 f17 17 16 15 14 7 dr in dr in rx out rx out ov 3 2 5 4 8 9 10 11 22 23 20 21 6 rx out rx out dr in dr in 0v eia562/ rs232 interface lines figure 17. typical connection for eia562/rs232 interface figure 18. typical connection for eia562 interface 1/2 ltc1335 1/2 ltc1335 1321/22/35 f18 17 16 15 14 7 dr in dr in rx out rx out ov 3 2 5 4 8 9 10 11 22 23 20 21 6 rx out rx out dr in dr in 0v eia562 interface lines 1 oe = 0v 1 oe = 0v figure 19. typical connection for rs485 interface 5v 2 1/2 ltc1322/ltc1335 1/2 ltc1322/ltc1335 1/2 ltc1322/ltc1335 1321/22/35 f19 rx out dr enable dr in 5v 120 w 3 4 5 22 21 20 6 11 10 9 8 7 rx out 16 5v dr enable 54 32 20 dr in rx out dr enable 21 22 6 15 dr in 17 120 w
17 ltc1321/ltc1322/ltc1335 u s a o pp l ic at i ty p i ca l a typical rs422 connection shown in figure 20 allows one driver and ten receivers on a twisted pair of wires termi- nated with a 100 w resistor at one end. the ground shield is optional. a typical twisted pair line repeater is shown in figure 21. as data transmission rate drops with increased cable length, repeater can be inserted to improve transmission rate or to transmit beyond 4000 feet limit. figure 20. typical connection for rs422 interface 1/2 ltc1322/ltc1335 tx out rx in 1321/22/35 f21 100 w 2 3 4 6 21 20 22 5 5v figure 21. typical cable repeater for rs422 interface 1/2 ltc1322/ltc1335 1/2 ltc1322/ltc1335 1/2 ltc1322/ltc1335 1321/22/35 f20 100 w 20 21 6 22 7 15 16 17 5v 5v rx out rx out rx out dr enable dr enable dr in dr in 3 2 6 5v 2 3 4 5 9 8 11 22 10 100 w
18 ltc1321/ltc1322/ltc1335 u s a o pp l ic at i ty p i ca l the ltc1322/ltc1335 can be used to translate eia562 to rs422 interface level or vice versa as shown in figure 22. one port is configured as eia562 transceiver and the other as rs485 transceiver. the ltc1322 can also support rs232 to rs422 level translation if v dd is between 6.5v and 10v, and v ee is between C 6.5v and C 10v. using two ltc1321/ltc1335 as level translators, the eia562/rs232 interface distance can be extended to 4000 feet with twisted wires (figure 23). rs422 eia562/rs232* 1321/22/35 f22 100 w 10 8 7 17 22 21 20 15 6 tx out tx out rx in rx in 5v 2 3 4 5 ltc1322/ltc1335 * rs232 levels are supported on ltc1322. figure 22. typical eia562/rs232 to rs422 level translator rs422 eia562/rs232* 1321/22/35 f23 100 w 100 w 10 8 7 17 22 21 20 15 6 tx out rx in 5v 2 3 4 5 ltc1322/ltc1335 eia562/rs232* 20 8 10 15 5v 7 17 22 21 6 2 3 4 5 rx in tx out * rs232 levels are supported on ltc1322. ltc1322/ltc1335 figure 23. typical cable extension for eia562/rs232 interface
19 ltc1321/ltc1322/ltc1335 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 n package 24-lead plastic dip dimensions in inches (millimeters) unless otherwise noted. n24 0592 0.260 ?0.010 (6.604 ?0.254) 1.265 (32.131) 12 3 4 5 6 7 8910 19 11 12 13 14 16 15 17 18 20 21 22 23 24 0.015 (0.381) 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) 0.050 ?0.085 (1.27 ?2.159) 0.100 ?0.010 (2.540 ?0.254) 0.009 ?0.015 (0.229 ?0.381) 0.300 ?0.325 (7.620 ?8.255) 0.325 +0.025 0.015 +0.635 0.381 8.255 () sol24 0392 note 1 0.598 ?0.614 (15.190 ?15.600) (note 2) 22 21 20 19 18 17 16 15 1 23 4 5 6 78 0.394 ?0.419 (10.007 ?10.643) 910 13 14 11 12 23 24 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) 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 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 24-lead plastic sol
20 ltc1321/ltc1322/ltc1335 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7487 (408) 432-1900 l fax : (408) 434-0507 l telex : 499-3977 lt/gp 0594 10k ? printed in usa ? linear technology corporation 1994 northeast region linear 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 offices southeast 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 region linear 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 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 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 taiwan linear 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 korea linear 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 headquarters linear technology corporation 1630 mccarthy blvd. milpitas, ca 95035-7487 phone: (408) 432-1900 fax: (408) 434-0507 international sales offices

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