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?2011 device engineering inc page 1 of 12 ds-mw-01070-02 rev g 03/02/2011 features ? ttl/cmos to arinc 429 line driver ? hi/lo speed control pin for hi (100kbs) or lo (12.5kbs) speed slew rates ? 9.5v to 16.5v supplies ? drives full arinc load ? output resistor options: 0, 10 or 37.5 ohms ? tristate output options ? 8 lead soicn package with exposed pad fo r thermal enhancement (shown actual size) ? the dei1070a family is an improved version of the popular dei1070 family ? pin for pin replacements with the hi8585 and hi8586 general description the dei107xa is a family of 8 pin bipolar integrated circuit line drivers which directly drive the arinc 429 avionics serial digital data bus. these arinc 429 line dr ivers convert ttl/cmos serial input data to the ?tri- level rz bipolar differential modulation format? of the arin c bus. the output slew rate is selectable for hi speed (100kbs) or low speed (12.5kbs) operation. no external timing capacitors are required. the dei107xa line driver family is an improved vers ion of the popular dei107x family. it provides: ? lower power consumption ? excellent waveform fidelity ? improved transient immunity. this improvement si mplifies the equipment design for lightning and rf immunity requirements. this new line driver family provides options for various output resistor values and output tri-state capability (see table 1). there are three output resistor options: 0 ? , 10 ? and 37 ? . the 0 ? and 10 ? versions require external resistors to achieve the 37 ? output resistance of the arinc 429 standard. the external resistors are normally used to simplify the external tr ansient voltage protection network. th e outputs are tri-state capable on the 1073/4/5 versions. this feature is useful in non-standard appli cations where there are multiple drivers on a wire pair. table 1 line driver options 1070a 1071a 1072a 1073a 1074a 1075a output resistor value 37 ohms 10 ohms 0 ohms 37 ohms 10 ohms 0 ohms tri-state capability no no no yes yes yes 385 east alamo drive chandler, az 85225 phone: (480) 303-0822 fax: (480) 303-0824 e - mail: admin@deiaz.com dei1070a-dei1075a arinc 429 line driver family d evice e ngineering incorporated
?2011 device engineering inc page 2 of 12 ds-mw-01070-02 rev g 03/02/2011 terminal description 8 7 6 5 1 2 3 4 hi/lo ttlin0 ttlin1 gnd v- 429outa 429outb v+ functional description input logic and level shift edge shaping output drivers 429outa 429outb hi/lo ttlin1 ttlin0 tri-state rout: 0, 10, or 37.5 ohms rout: 0, 10, or 37.5 ohms figure 1 block diagram table 3 speed control function table hi/lo output transition time l 10us (12.5kbs data) h 1.5us (100kbs data) table 4 transmit data function table ttlin1 ttlin0 429outa 429outb notes l l 0v 0v null output l h -5v 5v zero output h l 5v -5v one output h h 0v 0v null output 1070a/1071a/1072a h h hi-z hi-z hi-z output 1073a/1074a/1075a pin name description 1 hi/lo logic input. slew rate control. 1 = hi speed. 0 = low speed. 2 ttlin0 logic input. serial digital data input 0. 3 ttlin1 logic input. serial digital data input 1. 4 gnd power input. ground. 5 v- power input. ?9.5 to ?16.5 vdc 6 429outa 429 output. arinc 429 format serial digital data output a. 7 429outb 429 output. arinc 429 format serial digital data output b. 8 v+ power input. +9.5 to +16.5 vdc. table 2 pin description note: heatsink pad is electrically isolated.
?2011 device engineering inc page 3 of 12 ds-mw-01070-02 rev g 03/02/2011 ttlin1 ttlin0 429outa 429outb +5 -5 +5 -5 differential 429out (a-b) +10 -10 trise trise tfall tfall 90% 10% 10% 90% tf tr 90% 10% 90% 10% tf tr figure 2 line driver waveforms electrical description table 5 absolute maximum ratings parameter min max units v+ supply voltage -0.3 +20 v v- supply voltage 0.3 -20 v storage temperature -65 +150 c input voltage ttlin and hi/lo inputs 429out outputs (175us surge) 1072a/1075a 1071a/1074a 1070a/1073a gnd ? 0.5 ?v-? ? 1.0 ?v-? ? 5.0 ?v-?? 20 ?v+? + 0.5 ?v+? + 1.0 ?v+? + 5.0 ?v-? ? 20 v v v v input current 429out outputs (175us surge) -0.5 0.5 a power dissipation @ 85c 8l ep soic, thermal pad soldered to heat spreader land 8l sb dip 1.2 0.72 w w junction temperature: tjmax, plastic packages tjmax, ceramic packages 150 175 c c esd per jedec a114-a human body model 2000 v peak body temperature: 8l ep soic 260 c notes: 1. stresses above absolute maxi mum ratings may cause perman ent damage to the device. 2. the device is tolerant of one or both outputs s horted to ground and of both outputs shorted together. 3. voltages referenced to ground
?2011 device engineering inc page 4 of 12 ds-mw-01070-02 rev g 03/02/2011 table 6 recommended operating conditions parameter symbol conditions supply voltage v+ v- 9.5 to 16.5v -9.5 to ?16.5v operating temperature -xex parts -xmx parts t op -55 to +85 c -55 to +125 c table 7 electrical characteristics parameter test conditions (1) symbol min nom max units logic inputs input voltage, logic 1 vih 2.0 v+ v input voltage, logic 0 vil -0.3 0.8 v input current, logic 1 vin = 5.0v iih 0 25 100 ua input current, logic 0 vin = 0.0v iil 0 -20 -100 ua arinc outputs arinc output voltage hi null lo single ended referenced to ground n o load. vohi vonull volo 4.5 -0.25 -5.5 5.0 0 -5.0 5.5 +0.25 -4.5 v v v output tristate leakage current 1073a/1074a/1075a force output to -5v and +5v iz -200 +200 ua arinc output short circuit current 1072a/1075a external 37.5 ? resistor to gnd output lo output hi isclo ischi 100 -146 133 -133 146 -100 ma ma arinc output short circuit current 1071a/1074a external 27.5 ? resistor to gnd output lo output hi isclo ischi 67 -175 133 -133 175 -67 ma ma arinc output short circuit current 1070a/1073a output shorted to gnd output lo output hi isclo ischi 64 -283 133 -133 283 -64 ma ma output resistance: 1070a/1073a 1071a/1074a 1072a/1075a room temperature calculated from delta-vout / delta-iload where iload = 0 and 20ma see figure 3 rout37 rout10 rout0 24 6 0 37.5 10 0.2 50 13.5 2 ohms ohms ohms output slew rate, hi speed lo to hi and hi to lo transitions hi/lo = 1 n o loa d , 10% to 90% single ended output tr/tf 1 2 us output slew rate, lo speed lo to hi and hi to lo transitions hi/lo = 0 n o loa d , 10% to 90% single ended output tr/tf 5 15 us supply current quiescent operating supply current: iv+ iv- v+ =15v, v- = -15v hi/lo = 0 or 1 ttlin0=ttlin1= 0v n o loa d iv+ iv- - -6.0 3.0 -2.5 6.0 - ma ma
?2011 device engineering inc page 5 of 12 ds-mw-01070-02 rev g 03/02/2011 parameter test conditions (1) symbol min nom max units n otes: 1. general conditions: tcase = rated operating temperature, -55/+85 c or -55/+125c. v+/- = +/-9.5 to +/-16.5v 2. unless otherwise noted, currents flowing in to dut are positive, currents flowing out of dut are negative, voltages are referenced to ground. 3. not production tested. 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 -100 -50 0 50 100 150 200 temperature (c) normalized resistance figure 3 normalized output resistance vs. temperature output v-i characteristics -1000 -800 -600 -400 -200 0 200 400 600 800 1000 -20 -15 -10 -5 0 5 10 15 20 output voltage (v) output current (ma) null output hi output lo output figure 4 429out v-i charact eristics, 15v supplies
?2011 device engineering inc page 6 of 12 ds-mw-01070-02 rev g 03/02/2011 output amp rout: 0, 10, or 37.5 ohms v+ v- output amp v- v+ dei107xa outa outb to arinc data bus twisted shielded pair cable tvs r1 r2 design considerations power supplies and bypass capacitors the dei107xa line driver operates from 9.5v to 16.5v dua l supplies. proper bypassing ensures stability while driving large capacitive loads. the line driver requires a minimum of a 0.1uf bypass capacitor placed as close as possible to the v+ and v- pins. transient voltage protection the dei107xa line driver requires external components to achieve immunity from surges such as those defined by do160d section 22, ?lightning induced transient susceptibility?. typical surge protection includes silicon transient voltage suppressor (tvs) devices and may include all or part of the 37.5 ohm output resistance as external resistors to limit the surge current. the 107xa has a robust output stage which includes large driver devices and clamp diodes to the v+ and v- power rails as shown in figure 5. it withstands surge currents of 0.5a for 175us without damage when powered with 15v supplies. at that surg e current, the diodes clamp at ~1v above (below) the v+ ( v-) supply rail. ~350ma flows to the v- (v+) supply through the output amplifier, and ~150ma flows to the v+ (v-) supply through the clamp diode. the outputs may be damaged by surges greater than 1a / 175us. at that current, the diodes clamp at ~1.8v above (below) the supply. figure 5 surge protection network the external lightning protection network should be designed to meet the specific requirements and constraints of the application equipment. the protection network should limit the outa/b pin surge current to the 0.5a / 175us maximum. the generalized circuit of figure 5 represents several tvs protection network options: ? the on-chip rout value is 0, 10, or 37 ohms depending on the 1070a ? 1075a part number ? select the total output resistance, rout + r1 + r2, = 37 ohms to meet arinc bus requirements o select r1 = 37 ? , r2 = 0 ? , rout = 0 ? for lowest tvs surge current rating (smallest tvs devices) o select r1 = 0 ? , rout + r2 = 37 ? for highest tvs clamp voltage (20v + v+/-) o if the v+/v- supplies are un-powered or below operating voltage during the surge event, large currents may flow through the internal clamp diodes and damage the driver. if the application requires lightning immunity while un- powered, select r1 = 0 ? , rout + r2 = 37 ? , and select the tvs clamp voltage for <20v. ? select tvs devices for the following o tvs surge power/current rating must withstand the app lication requirements for lightning induced transient levels and waveforms. microsemi corporation publishes an application note specific to the do160 lightning requirements, available at: http://www.microsemi.com/micnotes/126.pdf o select low capacitance tvs devices to minimize the load on th e line driver. (examples: microsemi lc and hsmbjsa series tvs) this is a priority for hi speed arinc applications where the low capacitance is important for optimum signal integrity and power consumption. note that the maximum total capacitance on the arinc bus is 30nf line to line. o select the tvs clamp voltage at the lightning surge conditions such that the voltage/current into the 107xa out pin is within the safe region. ? if r1 is used to limit the tvs surge current, the re sistor must withstand the surge current and voltage. alternate protection methods may be appropriate in some applications. ? external clamp diodes to the supply rails may be used to sh unt surge current to the supply rails rather than to ground. ? ptc ?resetable fuses? may be used for r1 to protect the driver and tvs from shorts to 28v aircraft power.
?2011 device engineering inc page 7 of 12 ds-mw-01070-02 rev g 03/02/2011 some general considerations related to lightning immunity: ? analyze the tvs high current signal and ground return path to insure adequate surge current capability. the ir voltage and l*di/dt voltage in the ground return will add additional stress beyond the tvs clamp voltage. ? observe suitable pcb design rules for traces subj ect to high voltage and high current surges. ? when possible, locate tvs devices close to the equipment connector to minimize the length of the surge voltage/current traces within the equipment. ? the shields of arinc 429 data bus cables should be terminated to aircraft ground at all ends and at all bulkhead disconnects. thermal management good thermal management is fundamental to line driver device reliability. it is par ticularly important in designs operating at the hi speed data rate (100kbs) with high capacitive loads as this produces maximum power dissipation. while the 107xa device will function at a junction temperature (tj) above 190c, it is inappropriate to continuously operate the plastic packag e above 150c. like all microcircuits, long term relia bility is improved with lower operating temperatures. the line driver?s operating tj is determined by internal power dissipation, package th ermal resistance, and ambient temperature. the internal power dissipation (p d) varies greatly with several variables: ? data rate ? the hi speed (100kbs) rate produces maximum power dissipation ? load ? the maximum arinc 429 load is 30nf||400 ? line-to-line. many applications only drive a fraction of the full load. ? data duty cycle - arinc bus activity, averaged over 10 seconds = bits transmitted / total possible bits. many applications are active <70%. ? supply voltage ? v+/v- supply range is from 9.5v to 16.5v. higher voltage => higher power ? rout configuration - the power dissipated in the two 37 ? output resistors is internal to the ic for the 1070/3, and external for the 1072/5. the internal power dissipation for 100kbs applications can be estimated from figure 6. pd for low speed operation (12.5kbs) is normally not an issue, so is not considered here. the curves in figure 6 indicate pd for various loads, supply voltage, and ro ut configuration. it represents pd for 100% data duty cycle at 100kbs with no word gap null times. thus the indicated pd values are considered maximum values and should be reduced to account for the data duty cycle as follows: ? estimate ddc = total bits transmitted in 10 sec period / 1,000,000 = 32 x total arinc words transmitted in 10 sec period / 1,000,000 ? use figure 6 to select an indicated pd for the application supply voltage and load. this may involve estimating the line driver?s load and interpolating between the curves. ? calculate adjusted pd = ddc * (pd - 0.1) + 0.1 (w) the operating junction temperature is calculated as follows: tj = ta + pd* ja where tj = junction temperature ( c) ta = ambient temperature ( c) pd = internal power dissipation (w) ja = ic package thermal resistance from junction to ambient ( c/w). refer to package details. the arinc 429 line driver outputs may be subject to short ci rcuit conditions due to cable wiring errors or faults which typically occur during equipment test a nd aircraft installation environments. the common cases are one or both outputs shorted to ground, or both outputs shorted together. these conditions may cause considerable internal power dissipation depending on the following: ? data duty cycle ? the line-to-line and line-to-ground shor ts cause little or no power dissipation when the outputs are in the null state. however when the output is driving a hi/lo state, the short circuit current is limited by the 37.5 ? rout at about ~133ma. this is modulated by the arinc waveform, producing an effective current of ~88ma* ddc. this current causes heating in the output amplifier and rout resistor. ? supply voltage ? a lower supply voltage results in lower pd du ring short circuit conditions. the internal pd for both outputs shorted while operating at 100% ddc is ~2w with 15v supplies, but is reduced to ~1.5w with 12v supplies. this is for 0 ? rout configurations.
?2011 device engineering inc page 8 of 12 ds-mw-01070-02 rev g 03/02/2011 ? rout configuration ? each of the two 37.5 ? rout resistors dissipates ~0.29w when shorted at 100% ddc. this power is dissipated in the external resistors for the 1072a or 1075a parts, and internal to the ic for the 1070a or 1073a parts. thus the 1072a or 1075a have a lower tj and are more tolerant to short circuit conditions. the pcb design and layout is a significant factor in determining thermal resistance ( ja) of the line driver ic package . use maximum trace width on all power and signal connections at the ic. these traces serv e as heat spreaders which improve heat flow from the ic leads . the exposed heat sink pad of the soic package shou ld be soldered to a heat-spreader land pattern on the pcb. the ic exposed pad is electrically isolated, so the pcb land may be at any potential; typically ground for the best heat sink. maximize the pcb land size by extending it beyond the ic outline if possible. a grid of thermal vias, which drop down and connect to the buried copper plane(s), should be pl aced under the heat-spreader land . a typical via grid is 12mil holes on a 50mil pitch. the barrel is plated to about 1.0 ounce copper . use as many vias as space allows. vias should be plugged to prevent voids being formed between the exposed pad and pcb heat-spreader land due to solder escaping by the capillary effect. this can be avoided by tenting the vias with solder mask. dei107xa power dissipation 100kbs data rate, 100% duty cycle 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 8 1012141618 supply voltage (+/-v) power dissipated in ic (w) no load 15nf/800 ? load - internal 37 ? 15nf/800 ? load - external 37 ? 30nf/400 ? load - internal 37 ? 30nf/400 ? load- external 37 ? figure 6 internal power dissipation
?2011 device engineering inc page 9 of 12 ds-mw-01070-02 rev g 03/02/2011 package description table 8 package characteristics figure 7 mechanical outline - 8l ep soic (exposed pad) package type package ref thermal resist. jc / ja (oc/w) jedec moisture sensitivity level & peak body temp lead finish material / jedec pb-free code pb free designaton 8l sb dip 8 sb dip 55 / 125 hermetic au e4 pb free solder terminals 8l ep soic (exposed pad) 8 ep soic g 10 / 49 (1) msl 1 260oc nipdau e4 rohs compliant 8l es soic (exposed slug) 8 es soic g 10 / 49 (1) msl 1 260oc matte sn e3 rohs compliant notes: 1. ja with the exposed pad soldered to a pcb land with (6) 12 mil thermal vias connected to an internal ground plane which is one of the 2 center layers on a 4 layer board .
?2011 device engineering inc page 10 of 12 ds-mw-01070-02 rev g 03/02/2011 figure 8 mechanical outline - 8l es soic (exposed slug) figure 9 mechanical outline - 8l ceramic sidebrazed dip
?2011 device engineering inc page 11 of 12 ds-mw-01070-02 rev g 03/02/2011 process description table 9 process flow process step standard burn-in pre-burn-in electrical test n/a yes burn in (1) n/a 96hrs @ +125 c final electrical test, room temperature 100% 100% final electrical test, high temperature 100% @ +85 or +125c 100% @ +85 or +125c final electrical test, low temperature 0.65% aql @ -55c 0.65% aql @ -55c notes: 1. burn-in conditions: 125c, 96 hrs, v+/v- = +/-15.0v inputs = 0v, outputs open.
?2011 device engineering inc page 12 of 12 ds-mw-01070-02 rev g 03/02/2011 ordering information table 10 ordering information part number marking package output resistor tri state output burn-in temperature dei1070a-ses-g de1070a / es 8l ep soic g 37 no no -55 / +85 oc dei1070a-sms-g de1070a / ms 8l ep soic g 37 no no -55 / +125 oc dei1070a-smb-g de1070a / mb 8l ep soic g 37 no yes -55 / +125 oc dei1070a-dms dei1070a / dms 8l sb dip 37 no no -55 / +125 oc dei1070a-dmb dei1070a / dmb 8l sb dip 37 no yes -55 / +125 oc dei1071a-ses-g de1071a / es 8l ep soic g 10 no no -55 / +85 oc dei1071a-sms-g de1071a / ms 8l ep soic g 10 no no -55 / +125 oc dei1071a-smb-g de1071a/mb 8l ep soic g 10 no yes -55 / +125 oc dei1071a-dms dei1071a / dms 8l sb dip 10 no no -55 / +125 oc dei1071a-dmb dei1071a / dmb 8l sb dip 10 no yes -55 / +125 oc dei1072a-ses-g de1072a / es 8l ep soic g 0 no no -55 / +85 oc dei1072a-sms-g de1072a / ms 8l ep soic g 0 no no -55 / +125 oc dei1072a-smb-g de1072a / mb 8l ep soic g 0 no yes -55 / +125 oc dei1072a-dms dei1072a / dms 8l sb dip 0 no no -55 / +125 oc dei1072a-dmb dei1072a / dmb 8l sb dip 0 no yes -55 / +125 oc dei1072a-yes-g dei / 1072ayes 8l es soic g 0 no no -55 / +85 oc dei1073a-ses-g de1073a / es 8l ep soic g 37 yes no -55 / +85 oc dei1073a-sms-g de1073a / ms 8l ep soic g 37 yes no -55 / +125 oc DEI1073A-SMB-G de1073a / mb 8l ep soic g 37 yes yes -55 / +125 oc dei1073a-dms dei1073a / dms 8l sb dip 37 yes no -55 / +125 oc dei1073a-dmb dei1073a / dmb 8l sb dip 37 yes yes -55 / +125 oc dei1074a-ses-g de1074a / es 8l ep soic g 10 yes no -55 / +85 oc dei1074a-sms-g de1074a / ms 8l ep soic g 10 yes no -55 / +125 oc dei1074a-smb-g de1074a / mb 8l ep soic g 10 yes yes -55 / +125 oc dei1074a-dms dei1074a / dms 8l sb dip 10 yes no -55 / +125 oc dei1074a-dmb dei1074a / dmb 8l sb dip 10 yes yes -55 / +125 oc dei1075a-ses-g de1075a / es 8l ep soic g 0 yes no -55 / +85 oc dei1075a-sms-g de1075a / ms 8l ep soic g 0 yes no -55 / +125 oc dei1075a-smb-g de1075a / mb 8l ep soic g 0 yes yes -55 / +125 oc dei1075a-dms dei1075a / dms 8l sb dip 0 yes no -55 / +125 oc dei1075a-dmb dei1075a / dmb 8l sb dip 0 yes yes -55 / +125 oc dei reserves the right to make changes to any products or sp ecifications herein. dei makes no warranty, representation, or guarantee regarding suitability of its products for any particular purpose.

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