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1 ltc1690 differential driver and receiver pair with fail-safe receiver output , ltc and lt are registered trademarks of linear technology corporation. the ltc ? 1690 is a low power receiver/driver pair that is compatible with the requirements of rs485 and rs422. the receiver offers a fail-safe feature that guarantees a high receiver output state when the inputs are left open, shorted together or terminated with no signal present. no external components are required to ensure the high receiver output state. separate driver output and receiver input pins allow full duplex operation. excessive power dissipation caused by bus contention or faults is prevented by a thermal shut- down circuit which forces the driver outputs into a high impedance state. the ltc1690 is fully specified over the commercial and industrial temperature ranges. the ltc1690 is available in 8-pin so, msop and pdip packages. n battery-powered rs485/rs422 applications n low power rs485/rs422 transceiver n level translator n line repeater 120 3 5 6 d1 120 2 8 7 r2 driver ltc1690 ltc1690 receiver 120 2 7 8 y1 z1 b1 a1 a2 b2 z2 y2 r1 120 3 6 5 d2 receiver driver 1690 ta01 n no damage or latchup to 15kv esd (human body model), iec1000-4-2 level 4 ( 8kv) contact and level 3 ( 8kv) air discharge n guaranteed high receiver output state for floating, shorted or terminated inputs with no signal present n drives low cost residential telephone wires n i cc = 600 m a max with no load n single 5v supply n C7v to 12v common mode range permits 7v ground difference between devices on the data line n power-up/down glitch-free driver outputs permit live insertion or removal of transceiver n driver maintains high impedance with the power off n up to 32 transceivers on the bus n pin compatible with the sn75179 and ltc490 n available in so, msop and pdip packages d1 b2 a2 r2 1690 ta01a applicatio s u features typical applicatio u descriptio u driving a 1000 foot stp cable
2 ltc1690 symbol parameter conditions min typ max units v od1 differential driver output voltage (unloaded) i o = 0 l v cc v v od2 differential driver output voltage (with load) r = 50 w ; (rs422) l 2v r = 22 w or 27 w ; (rs485), figure 1 l 1.5 5 v v od3 differential driver output voltage (with common mode) v tst = C7v to 12v, figure 2 1.5 5 v d v od change in magnitude of driver differential output r = 22 w , 27 w or 50 w , figure 1 l 0.2 v voltage for complementary output states v tst = C7v to 12v, figure 2 v oc driver common mode output voltage r = 22 w , 27 w or 50 w , figure 1 l 3v d |v oc | change in magnitude of driver common mode r = 22 w , 27 w or 50 w , figure 1 l 0.2 v output voltage for complementary output states v ih input high voltage driver input (d) l 2v v il input low voltage driver input (d) l 0.8 v i in1 input current driver input (d) l 2 m a i in2 input current (a, b) v cc = 0v or 5.25v, v in = 12v l 1ma v cc = 0v or 5.25v, v in = C7v l C0.8 ma v th differential input threshold voltage for receiver C7v v cm 12v l C 0.20 C 0.01 v d v th receiver input hysteresis v cm = 0v 30 mv absolute m axi m u m ratings w ww u supply voltage (v cc ) .............................................. 6.5v driver input voltage ..................... C0.3v to (v cc + 0.3v) driver output voltages ................................. C7v to 10v receiver input voltages ......................................... 14v receiver output voltage .............. C0.3v to (v cc + 0.3v) junction temperature ........................................... 125 c operating temperature range ltc1690c ........................................ 0 c t a 70 c ltc1690i ..................................... C 40 c t a 85 c storage temperature range ................. C 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c (note 1) order part number ms8 part marking order part number ltc1690cms8 ltda s8 part marking 1690 1690i ltc1690cn8 ltc1690in8 ltc1690cs8 ltc1690is8 consult factory for military grade parts 1 2 3 4 8 7 6 5 top view v cc r d gnd a b z y n8 package 8-lead plastic dip s8 package 8-lead plastic so d r t jmax = 125 c, q ja = 130 c/w (n) t jmax = 125 c, q ja = 135 c/w (s) 1 2 3 4 8 7 6 5 top view ms8 package 8-lead plastic msop v cc r d gnd a b z y t jmax = 125 c, q ja = 200 c/w package/order i n for m atio n w u u the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v cc = 5v 5% (notes 2, 3) dc electrical characteristics
3 ltc1690 the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v cc = 5v 5% (notes 2, 3) dc electrical characteristics symbol parameter conditions min typ max units v oh receiver output high voltage i o = C 4ma, v id = 200mv l 3.5 v v ol receiver output low voltage i o = 4ma, v id = C 200mv l 0.4 v r in receiver input resistance C7v v cm 12v l 12 22 k w i cc supply current no load l 260 600 m a i osd1 driver short-circuit current, v out = high C7v v o 10v 35 250 ma i osd2 driver short-circuit current, v out = low C7v v o 10v 35 250 ma i oz driver three-state current (y, z) C7v v o 10v, v cc = 0v l 5 200 m a i osr receiver short-circuit current 0v v o v cc l 785ma t plh driver input to output, figure 3, figure 4 r diff = 54 w , c l1 = c l2 = 100pf l 10 22.5 60 ns t phl driver input to output, figure 3, figure 4 r diff = 54 w , c l1 = c l2 = 100pf l 10 25 60 ns t skew driver output to output, figure 3, figure 4 r diff = 54 w , c l1 = c l2 = 100pf l 2.5 15 ns t r , t f driver rise or fall time, figure 3, figure 4 r diff = 54 w , c l1 = c l2 = 100pf l 21340 ns t plh receiver input to output, figure 3, figure 5 r diff = 54 w , c l1 = c l2 = 100pf l 30 94 160 ns t phl receiver input to output, figure 3, figure 5 r diff = 54 w , c l1 = c l2 = 100pf l 30 89 160 ns t skd |t plh C t phl |, differential receiver skew, figure 3, figure 5 r diff = 54 w , c l1 = c l2 = 100pf 5 ns f max maximum data rate, figure 3, figure 5 r diff = 54 w , c l1 = c l2 = 100pf l 5 mbps note 1: absolute maximum ratings are those values beyond which the life of the device may be impaired. 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 for v cc = 5v and t a = 25 c. typical perfor a ce characteristics uw temperature ( c) 55 35 15 5 25 45 65 85 105 125 receiver input threshold voltage (mv) 1690 g01 0 ?0 ?0 ?0 ?0 100 120 140 160 180 200 v cc = 5v v cm = 12v v cm = 0v v cm = 7v temperature ( c) 55 35 15 5 25 45 65 85 105 125 receiver input threshold voltage (mv) 1690 g02 0 ?0 ?0 ?0 ?0 100 120 140 160 180 200 v cc = 5v v cm = 12v v cm = 7v v cm = 0v temperature ( c) 55 35 15 5 25 45 65 85 105 125 receiver hysteresis (mv) 1690 g03 100 90 80 70 60 50 40 30 20 10 0 v cc = 5v v cm = 12v v cm = 7v v cm = 0v receiver input threshold voltage (output high) vs temperature receiver input threshold voltage (output low) vs temperature receiver hysteresis vs temperature
4 ltc1690 typical perfor a ce characteristics uw temperature ( c) 55 35 15 5 25 45 65 85 105 125 receiver input offset voltage (mv) 1690 g04 0 ?0 ?0 ?0 ?0 100 120 140 160 180 200 v cc = 5v v cm = 12v v cm = 7v v cm = 0v supply voltage (v) 4.5 4.75 5 5.25 5.5 receiver input threshold voltage (mv) 1690 g05 ?0 ?0 ?0 100 120 140 160 t a = 25 c output high output low receiver output high voltage (v) 5 receiver output current (ma) 3.5 2.5 1690 g06 4.5 4 3 ?5 ?0 ?5 ?0 ? 0 2 t a = 25 c v cc = 4.75v receiver output low voltage (v) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 receiver output current (ma) 1690 g07 40 35 30 25 20 15 10 5 0 t a = 25 c v cc = 4.75v temperature ( c) 55 35 15 5 25 45 65 85 105 125 receiver output high voltage (v) 1690 g08 4.8 4.6 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 i = 8ma v cc = 4.75v temperature ( c) 55 35 15 5 25 45 65 85 105 125 receiver output low voltage (v) 1690 g09 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 i = 8ma v cc = 4.75v temperature ( c) 55 35 15 5 25 45 65 85 105 125 receiver propagation delay (ns) 1690 g10 120 110 100 90 80 70 60 v cc = 5v t plh t phl temperature ( c) 55 35 15 5 25 45 65 85 105 125 receiver skew (ns) 1690 g11 10 9 8 7 6 5 4 3 2 v cc = 5v supply voltage (v) 4.5 4.6 4.7 4.8 4.9 5 5.1 5.2 5.3 5.4 5.5 receiver propagation delay (ns) 1690 g12 110 100 90 80 70 60 50 t plh t phl receiver input offset voltage vs temperature receiver input threshold voltage vs supply voltage receiver output high voltage vs output current receiver output low voltage vs output current receiver output high voltage vs temperature receiver output low voltage vs temperature receiver propagation delay vs temperature receiver skew ? t plh C t phl ? vs temperature receiver propagation delay vs supply voltage
5 ltc1690 typical perfor a ce characteristics uw temperature ( c) 55 35 15 5 25 45 65 85 105 125 ? short-circuit current ? (ma) 1690 g13 70 60 50 40 30 20 10 0 v cc = 5.25v output low output high temperature ( c) 55 35 15 5 25 45 65 85 105 125 supply current ( a) 1690 g14 340 320 300 280 260 240 220 200 180 160 140 120 v cc = 5.25v v cc = 4.75v v cc = 5v temperature ( c) 55 35 15 5 25 45 65 85 105 125 logic input threshold voltage (v) 1690 g15 1.75 1.70 1.65 1.60 1.55 1.50 v cc = 5.25v v cc = 4.75v v cc = 5v temperature ( c) 55 35 15 5 25 45 65 85 105 125 driver differential output voltage (v) 1690 g16 2.9 2.7 2.5 2.3 2.1 1.9 1.7 1.5 r l = 44 v cc = 5.25v v cc = 5v v cc = 4.5v v cc = 4.75v temperature ( c) 55 35 15 5 25 45 65 85 105 125 driver differential output voltage (v) 1690 g17 2.9 2.7 2.5 2.3 2.1 1.9 1.7 1.5 r l = 54 v cc = 5.25v v cc = 5v v cc = 4.5v v cc = 4.75v temperature ( c) 55 35 15 5 25 45 65 85 105 125 driver differential output voltage (v) 1690 g18 3.4 3.2 3.0 2.8 2.6 2.4 2.2 r l = 100 v cc = 5.25v v cc = 5v v cc = 4.5v v cc = 4.75v temperature ( c) 55 35 15 5 25 45 65 85 105 125 driver common mode output voltage (v) 1690 g19 3.0 2.5 2.0 1.5 1.0 0.5 0 r l = 44 v cc = 5v v cc = 4.5v v cc = 4.75v v cc = 5.25v temperature ( c) 55 35 15 5 25 45 65 85 105 125 driver common mode output voltage (v) 1690 g20 3.0 2.5 2.0 1.5 1.0 0.5 0 r l = 54 v cc = 4.5v v cc = 4.75v v cc = 5v v cc = 5.25v temperature ( c) 55 35 15 5 25 45 65 85 105 125 driver common mode output voltage (v) 1690 g21 3.0 2.5 2.0 1.5 1.0 0.5 0 v cc = 4.5v v cc = 4.75v v cc = 5v v cc = 5.25v r l = 100 receiver short-circuit current vs temperature supply current vs temperature logic input threshold voltage vs temperature driver differential output voltage vs temperature driver differential output voltage vs temperature driver differential output voltage vs temperature driver common mode output voltage vs temperature driver common mode output voltage vs temperature driver common mode output voltage vs temperature
6 ltc1690 typical perfor a ce characteristics uw driver differential output voltage (v) 012345 output current (ma) 1690 g22 100 90 80 70 60 50 40 30 20 10 0 t a = 25 c driver output high voltage (v) 01234 output current (ma) 1690 g23 100 ?0 ?0 ?0 ?0 0 t a = 25 c v cc = 5v driver output low voltage (v) 0 0.5 1 1.5 2 2.5 3 output current (ma) 1690 g24 100 90 80 70 60 50 40 30 20 10 0 t a = 25 c v cc = 5v temperature ( c) 55 35 15 5 25 45 65 85 105 125 driver propagation delay (ns) 1690 g25 30 25 20 15 10 5 0 v cc = 5v t phl t plh temperature ( c) 55 35 15 5 25 45 65 85 105 125 driver skew (ns) 1690 g26 4.0 3.5 3.0 2.5 2.0 1.5 1.0 v cc = 5v temperature ( c) 55 35 15 5 25 45 65 85 105 125 ? driver short-circuit current ? (ma) 1690 g29 250 200 150 100 50 0 v cc = 5.25v output high short to ?v output low short to 10v temperature ( c) 55 35 15 5 25 45 65 85 105 125 receiver input resistance (k ) 1690 g30 25 24 23 22 21 20 v cc = 5v v cm = 12v v cm = 7v supply voltage (v) 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 driver propagation delay (ns) 1690 g27 30 25 20 15 10 5 0 t phl t plh driver differential output voltage vs output current driver output high voltage vs output current driver output low voltage vs output current driver propagation delay vs temperature driver skew vs temperature driver propagation delay vs supply voltage driver short-circuit current vs temperature receiver input resistance vs temperature
7 ltc1690 switchi g ti e wavefor s uw w ? o d 3v 0v t plh v o = v(a) ?v(b) v o z y t skew t skew t r f = 1mhz, t r 10ns, t f 10ns 1.5v 90% 10% 50% t phl t f 1.5v 90% 10% 50% v o 1/2 v o 1690 f04 figure 4. driver propagation delays f = 1mhz, t r 10ns, t f 10ns note: t skd = |t phl ?t plh | input output a ?b r v od2 ? od2 5v v ol t phl 0v 1.5v t plh 0v 1.5v 1690 f05 figure 5. receiver propagation delays fu n ctio n tables uu driver dzy 101 010 receiver a C b r 3 C 0.01v 1 C 0.20v 0 inputs open 1 inputs shorted 1 note: table valid with or without termination resistors. 1690 f01 y z r r v od2 v oc 1690 f02 y z 60 375 v od3 v tst ?v to 12v 375 1690 f03 d y z r diff a b 15pf c l1 c l2 r + + + figure 1. driver dc test load #1 figure 2. driver dc test load #2 figure 3. driver/receiver timing test load test circuits pi n fu n ctio n s uuu v cc (pin 1): positive supply. 4.75v < v cc < 5.25v. r (pin 2): receiver output. r is high if (a C b) 3 C 10mv and low if (a C b) C 200mv. d (pin 3): driver input. if d is high, y is taken high and z is taken low. if d is low, y is taken low and z is taken high. gnd (pin 4): ground. y (pin 5): driver output. z (pin 6): driver output. b (pin 7): receiver input. a (pin 8) : receiver input.
8 ltc1690 3 1 5 6 d 120 2 1 8 7 r driver ltc1690 5v ltc1690 receiver 120 shield 2 4 7 8 r 3 4 6 5 d receiver driver 1690 f06 shield 0.01 f 5v 0.01 f figure 6. typical application applicatio n s i n for m atio n wu u u a typical application is shown in figure 6. two twisted pair wires connect two driver/receiver pairs for full duplex data transmission. note that the driver and receiver outputs are always enabled. if the outputs must be disabled, use the ltc491. there are no restrictions on where the chips are connected, and it isnt necessary to have the chips con- nected to the ends of the wire. however, the wires must be terminated at the ends with a resistor equal to their characteristic impedance, typically 120 w . because only one driver can be connected on the bus, the cable need only be terminated at the receiving end. the optional shields around the twisted pair are connected to gnd at one end and help reduce unwanted noise. the ltc1690 can be used as a line repeater as shown in figure 7. if the cable is longer that 4000 feet, the ltc1690 is inserted in the middle of the cable with the receiver output connected back to the driver input. receiver fail-safe some encoding schemes require that the output of the receiver maintains a known state (usually a logic 1) when data transmission ends and all drivers on the line are forced into three-state. the receiver of the ltc1690 has a fail-safe feature which guarantees the output to be in a logic 1 state when the receiver inputs are left floating or shorted together. this is achieved without external com- ponents by designing the trip-point of the ltc1690 to be within C 200mv to C10mv. if the receiver output must be a logic 0 instead of a logic 1, external components are required. the ltc1690 fail-safe receiver is designed to reject fast C7v to 12v common mode steps at its inputs. the slew rate that the receiver will reject is typically 400v/ m s, but C7v to 12v steps in 10ns can be tolerated if the frequency of the common mode step is moderate (<600khz). driver-receiver crosstalk the driver outputs generate fast rise and fall times. if the ltc1690 receiver inputs are not terminated and floating, switching noise from the ltc1690 driver can couple into the receiver inputs and cause the receiver output to glitch. this can be prevented by ensuring that the receiver inputs are terminated with a 100 w or 120 w resistor, depending on the type of cable used. a cable capacitance that is greater than 10pf ( ? 1ft of cable) also prevents glitches if no termination is present. the receiver inputs should not be driven typically above 8mhz to prevent glitches.
9 ltc1690 applicatio n s i n for m atio n wu u u fault protection when shorted to C7v or 10v at room temperature, the short-circuit current in the driver outputs is limited by internal resistance or protection circuitry to 250ma maxi- mum. over the industrial temperature range, the absolute maximum positive voltage at any driver output should be limited to 10v to avoid damage to the driver outputs. at higher ambient temperatures, the rise in die temperature due to the short-circuit current may trip the thermal shutdown circuit. the receiver inputs can withstand the entire C7v to 12v rs485 common mode range without damage. the ltc1690 includes a thermal shutdown circuit that protects the part against prolonged shorts at the driver outputs. if a driver output is shorted to another output or to v cc , the current will be limited to a maximum of 250ma. if the die temperature rises above 150 c, the thermal shutdown circuit three-states the driver outputs to open the current path. when the die cools down to about 130 c, the driver outputs are taken out of three-state. if the short persists, the part will heat again and the cycle will repeat. this thermal oscillation occurs at about 10hz and protects the part from excessive power dissipation. the average fault current drops as the driver cycles between active and three-state. when the short is removed, the part will return to normal operation. if the outputs of two or more ltc1690 drivers are shorted directly, the driver outputs cannot supply enough current to activate the thermal shutdown. thus, the thermal shut- down circuit will not prevent contention faults when two drivers are active on the bus at the same time. 3 5 6 d driver ltc1690 120 2 8 7 r receiver data out data in 1690 f07 figure 7. line repeater
10 ltc1690 cables and data rate the transmission line of choice for rs485 applications is a twisted pair. there are coaxial cables (twinaxial) made for this purpose that contain straight pairs, but these are less flexible, more bulky and more costly than twisted pairs. many cable manufacturers offer a broad range of 120 w cables designed for rs485 applications. losses in a transmission line are a complex combination of dc conductor loss, ac losses (skin effect), leakage and ac losses in the dielectric. in good polyethylene cables such as belden 9841, the conductor losses and dielectric losses are of the same order of magnitude, leading to relatively low overall loss (figure 8). when using low loss cable, figure 9 can be used as a guideline for choosing the maximum length for a given data rate. with lower quality pvc cables, the dielectric loss factor can be 1000 times worse. pvc twisted pairs have terrible losses at high data rates (>100kbits/s), reducing the maximum cable length. at low data rates, they are acceptable and are more economical. the ltc1690 is tested and guaranteed to drive cat 5 cable and termina- tions as well as common low cost residential telephone wire. applicatio n s i n for m atio n wu u u frequency (mhz) 0.1 0.1 loss per 100 ft (db) 1.0 10 1.0 10 100 1690 f08 figure 8. attenuation vs frequency for belden 9841 data rate (bps) 10k 10 cable length (ft) 100 1k 10k 100k 1m 10m 1690 f09 2.5m figure 9. rs485 cable length recommended. applies for 24 gauge, polyethylene dielectric twisted pair esd protection the esd performance of the ltc1690 driver outputs (z, y) and the receiver inputs (a, b) is as follows: a) meets 15kv human body model (100pf, 1.5k w ). b) meets iec1000-4-2 level 4 ( 8kv) contact mode speci- fications. c) meets iec1000-4-2 level 3 ( 8kv) air discharge speci- fications. this level of esd performance means that external voltage suppressors are not required in many applications, when compared with parts that are only protected to 2kv. the ltc1690 driver input (d) and receiver output are pro- tected to 2kv per the human body model. when powered up, the ltc1690 does not latch up or sustain damage when the z, y, a or b pins are subjected to any of the conditions listed above. the data during the esd event may be corrupted, but after the event the ltc1690 continues to operate normally. the additional esd protection at the ltc1690 z, y, a and b pins is important in applications where these pins are exposed to the external world via socket connections.
11 ltc1690 dimensions in inches (millimeters) unless otherwise noted. package descriptio n u msop (ms8) 1098 * dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.006" (0.152mm) per side ** dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.006" (0.152mm) per side 0.021 0.006 (0.53 0.015) 0 ?6 typ seating plane 0.007 (0.18) 0.040 0.006 (1.02 0.15) 0.012 (0.30) ref 0.006 0.004 (0.15 0.102) 0.034 0.004 (0.86 0.102) 0.0256 (0.65) bsc 12 3 4 0.193 0.006 (4.90 0.15) 8 7 6 5 0.118 0.004* (3.00 0.102) 0.118 0.004** (3.00 0.102) n8 1098 0.100 (2.54) bsc 0.065 (1.651) typ 0.045 ?0.065 (1.143 ?1.651) 0.130 0.005 (3.302 0.127) 0.020 (0.508) min 0.018 0.003 (0.457 0.076) 0.125 (3.175) min 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 () 12 3 4 87 6 5 0.255 0.015* (6.477 0.381) 0.400* (10.160) max *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch (0.254mm) 0.016 ?0.050 (0.406 ?1.270) 0.010 ?0.020 (0.254 ?0.508) 45 0 ?8 typ 0.008 ?0.010 (0.203 ?0.254) so8 1298 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) typ 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) bsc 1 2 3 4 0.150 ?0.157** (3.810 ?3.988) 8 7 6 5 0.189 ?0.197* (4.801 ?5.004) 0.228 ?0.244 (5.791 ?6.197) 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 * ** s8 package 8-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) ms8 package 8-lead plastic msop (ltc dwg # 05-08-1660) n8 package 8-lead pdip (narrow 0.300) (ltc dwg # 05-08-1510) 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.
12 ltc1690 1690f lt/tp 0400 4k ? printed in usa ? linear technology corporation 1998 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com 120 w 1.2k 5v rx 1.2k 1690 ta02 receiver 2.7k 2.7k rs232 in rx 1690 ta03 receiver receiver with low fail-safe output rs232 receiver related parts part number description comments ltc485 5v low power rs485 interface transceiver low power ltc1480 3.3v ultralow power rs485 transceiver with shutdown lower supply voltage ltc1481 5v ultralow power rs485 transceiver with shutdown lowest power ltc1482 5v low power rs485 transceiver with carrier detect output low power, high output state when inputs are open, shorted or terminated, 15kv esd protection ltc1483 5v ultralow power rs485 low emi transceiver with shutdown low emi, lowest power ltc1484 5v low power rs485 transceiver with fail-safe receiver circuit low power, high output state when inputs are open, shorted or terminated, 15kv esd protection ltc1485 5v rs485 transceiver high speed, 10mbps ltc1487 5v ultralow power rs485 with low emi, shutdown and highest input impedance, low emi, lowest power high input impedance ltc490 5v differential driver and receiver pair low power, pin compatible with ltc1690 ltc491 5v low power rs485 full-duplex transceiver low power ltc1535 isolated rs485 transceiver 2500v rms isolation, full duplex ltc1685 52mbps, rs485 fail-safe transceiver pin compatible with ltc485 ltc1686/ltc1687 52mbps, rs485 fail-safe driver/receiver pin compatible with ltc490/ltc491 lt1785/lt1791 60v fault protected rs485 half-/full-duplex transceiver 15kv esd protection typical applicatio n s u

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