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holt integrated circuits www.holtic.com 1 october, 2012 ds2579 rev. new 10/12 HI-2579, hi-2581 3.3v mil-std-1553/1760 dual transceiver with integrated transformers pin configuration (top) HI-2579clif HI-2579cltf hi-2581clif hi-2581cltf txa - 3 vdda - 5 vddb - 8 rxena - 6 rxenb - 9 gnda - 7 gndb - 10 busa - 2 busa - 1 dnc - 12 dnc - 11 txa - 4 24 - dnc 22 - txinha 17 - txinhb 16 - rxb 18 - txb 23 - dnc 13 - busb 14 - busb 21 - rxa 20 - rxa 19 - txb 15 - rxb dnc = do not connect general description the HI-2579 / hi-2581 are low power cmos dual transceivers with integrated transformers designed to meet the requirements of the mil-std-1553 / mil-std-1760 specifcations. the dual transceivers with integrated transformers provide a single part solution for interfacing a protocol ic or fpga to a dual redundant mil-std-1553 bus. the transmitter section of each bus takes complementary cmos / ttl manchester ii bi-phase data and converts it to differential voltages suitable for driving the integrated isolation transformer. separate transmitter inhibit control signals are provided for each transmitter. the receiver section of the each bus converts the 1553 bus differential data to complementary cmos / ttl data suitable for inputting to a manchester decoder. each receiver has a separate enable input which can be used to force both receiver outputs to logic 0 (HI-2579) or logic 1 (hi-2581). the family of parts are available in industrial -40 o c to +85 o c, or extended, -55 o c to +125 o c temperature ranges. features ? dual-redundant mil-std-1553 transceivers with integrated transformers ? small footprint package ? compliant to mil-std-1553a and b, mil-std-1760, arinc 708a ? 3.3v single supply operation ? less than 1.0w maximum power dissipation ? industrial and extended temperature ranges
holt integrated circuits 2 block diagram txa/b txa/b txinha/b rxa/b rxa/b rxena/b each bus not used not used busa/b busa/b comparator transmit logic slope control input filter receive logic gnd vdd isolation transformer figure 1. block diagram txa/b txa/b busa/b - busa/b rxa/b (HI-2579) rxa/b (HI-2579) rxa/b (hi-2581) rxa/b (hi-2581) vin (line to line) tdr tdr tdr trg trg trg trg tdr figure 2. example waveforms HI-2579, hi-2581
holt integrated circuits 3 pin descriptions table 1. pin descriptions pin symbol function description 1 busa analog o/p mil-std-1553 bus a driver, negative signal (transformer coupled or direct coupled bus connections) 2 busa analog o/p mil-std-1553 bus a driver, positive signal (transformer coupled or direct coupled bus connections) 3 txa digital i/p transmitter a digital data input, non-inverted 4 txa digital i/p transmitter a digital data input, inverted 5 vdda power transceiver a 3.3v supply 6 rxena digital i/p receiver a enable. if low, forces both rxa and rxa low (HI-2579) or high (hi-2581) 7 gnda power transceiver a ground connection 8 vddb power transceiver b 3.3v supply 9 rxenb digital i/p receiver b enable. if low, forces both rxb and rxb low (HI-2579) or high (hi-2581) 10 gndb power transceiver b ground connection 11 dnc ? not used. do not connect. 12 dnc ? not used. do not connect. 13 busb analog o/p mil-std-1553 bus b driver, positive signal (transformer coupled or direct coupled bus connections) 14 busb analog o/p mil-std-1553 bus b driver, negative signal (transformer coupled or direct coupled bus connections) 15 rxb digital i/p receiver b output, inverted 16 rxb digital i/p receiver b output, non-inverted 17 txinhb digital i/p transmit inhibit, bus b. if high busb, busb outputs are disabled 18 txb digital i/p transmitter b digital data input, non-inverted 19 txb power transmitter b digital data input, inverted 20 rxa power receiver a output, inverted 21 rxa digital i/p receiver a output, non-inverted 22 txinha digital i/p transmit inhibit, bus a. if high busa, busa outputs are disabled 23 dnc ? not used. do not connect. 24 dnc ? not used. do not connect. HI-2579, hi-2581
holt integrated circuits 4 functional description the HI-2579 family of data bus transceivers contains differential voltage source drivers, differential receivers and integrated transformers. they are intended for applications using a mil-std-1553 a/b data bus. transmitter data is input to the devices transmitter section from the complementary cmos inputs txa/b and txa/b . the transmitter accepts manchester ii bi-phase data and converts it to differential voltages which drive the internal transformers on busa/b and busa/b . the transformer outputs are either direct or transformer coupled to the mil-std-1553 data bus. both coupling methods produce a nominal voltage on the main bus of 7.5 volts peak to peak. the transmitter is automatically inhibited and placed in the high impedance state when both txa/b and txa/b are either at a logic 1 or logic 0 simultaneously. a logic 1 applied to the txinha/b input forces the transmitter to the high impedance state, regardless of the state of txa/b and txa/b . receiver the receiver accepts bi-phase differential data from the mil-std-1553 bus through the same direct or transformer coupled interface as the transmitter. the receivers differential input stage includes a flter and threshold comparator that produces cmos data at the rxa/b and rxa/b output pins. when the mil-std-1553 bus is idle and rxena or rxenb are high, rxa/b will be logic 0 on HI-2579 and logic 1 on hi-2581. each set of receiver outputs can also be independently forced to the bus idle state (logic 0 on HI-2579 or logic 1 on hi-2581) by setting rxena or rxenb low. mil-std-1553 bus interface there are two ways of connecting to the mil-std-1553 bus, using a direct coupled interface or a transformer coupled interface (see figure 3 ). a direct coupled interface uses the internal 1:2.5 ratio isolation transformer and two 55 isolation resistors between the transformer and the bus. in a transformer coupled interface, the transceiver is connected to the internal 1:2.5 isolation transformer which in turn is connected to a 1:1.4 coupling transformer. the transformer coupled method also requires two coupling resistors equal to 75% of the bus characteristic impedance (zo) between the coupling transformer and the bus. the coupling transformer and coupling resistors are commonly integrated in a single device known as a stub coupler. figure 4 and figure 5 show test circuits for measuring electrical characteristics of both direct and transformer coupled interfaces respectively (see electrical characteristics on the following pages) . absolute maximum ratings supply voltage (v dd ) -0.3 v to +5 v logic input voltage range -0.3 v dc to +3.6 v receiver differential voltage 50 vp-p driver peak output current +1.0 a power dissipation at 25c 1.0 w solder temperature 245 o c max. junction temperature 175 o c storage temperature -65 o c to +150 o c recommended operating conditions supply voltage v dd 3.3v 5% temperature range industrial screening hi-temp screening -40 o c to +85 o c -55 o c to +125 o c note: stresses above absolute maximum ratings or outside recommended operating conditions may cause permanent damage to the device. these are stress ratings only. operation at the limits is not recommended. HI-2579, hi-2581
holt integrated circuits 5 electrical characteristics table 2. dc electrical characteristics v dd = +3.3v, gnd = 0v, t a = operating temperature range (unless otherwise stated) parameter symbol test conditions min typ max units operating voltage v dd 3.15 3.3 3.45 v total supply current i cc1 not transmitting 4 17 ma i cc2 transmit one bus @ 50% duty cycle 225 320 ma i cc3 transmit one bus @ 100% duty cycle 425 640 ma power dissipation p d1 not transmitting 0.06 w p d2 transmit one bus @ 100% duty cycle 0.5 1.0 w min. input voltage (hi) v ih digital inputs 70% v dd max. input voltage (lo) v il digital inputs 30% v dd min. input current (hi) i ih digital inputs 20 a max. input current (lo) i il digital inputs -20 a min. output voltage (hi) v oh i out = -1.0ma, digital out - puts 90% v dd max. output voltage (lo) v ol i out = +1.0ma, digital outputs 10% v dd receiver (measured at point ad in figure 2 unless otherwise specifed) input resistance r in differential 2 k input capacitance c in differential 5 pf common mode rejection ratio cmrr 45 db input common mode voltage v icm -10.0 +10.0 v-pk threshold voltage - direct coupled detect v thd 1mhz sine wave (measured at point ad in figure 4 ) 0.86 vp-p no detect v thnd 0.28 vp-p threshold voltage - transformer coupled detect v thd 1mhz sine wave (measured at point at in figure 5 ) 0.86 vp-p no detect v thnd 0.20 vp-p HI-2579, hi-2581
holt integrated circuits 6 parameter symbol test conditions min typ max units transmitter (measured at point ad in figure 2 unless otherwise specifed) output voltage direct coupled v out 35 load (measured at point ad in figure 4 ) 6.1 9.0 vp-p transformer coupled v out 70 load (measured at point at in figure 5 ) 20.0 27.0 vp-p output noise v on differential, inhibited 10 mvp-p output dynamic offset voltage direct coupled v dyn 35 load (measured at point ad in figure 4 ) -90 +90 mv transformer coupled v dyn 70 load (measured at point at in figure 5 ) -250 +250 mv output capacitance c out 1mhz sine wave 15 pf table 3. ac electrical characteristics v dd = +3.3v, gnd = 0v, t a = operating temperature range (unless otherwise stated) parameter symbol test conditions min typ max units receiver (measured at point at in figure 3) receiver delay t dr from input zero crossing to rxa/b or rxa/b 450 note 3 ns receiver gap time t rg spacing between rxa/b and rxa/b pulses 90 note 1 365 note 3 ns receiver enable delay t ren from rxena/b rising or falling edge to rxa/b or rxa/b 40 ns transmitter (measured at point ad in figure 2) driver delay t dt txa/b, txa/b to busa/b, busa/b 150 ns rise time t r 35 load 100 300 ns fall time t f 35 load 100 300 ns inhibit delay t di-h inhibited output 100 ns t di-l active output 150 ns note 1. measured using a 1 mhz sinusoid, 20 v peak to peak, line to line at point at (guaranteed but not tested). note 2. measured using a 1 mhz sinusoid, 860 mv peak to peak, line to line at point at (100% tested). note 3. measured using a 1 mhz sinusoid, 860 mv peak to peak, line to line at point at. measured from input zero crossing point. HI-2579, hi-2581
holt integrated circuits 7 busb busb busa busa transceiver a transceiver b HI-2579 55? 55? isolation transformer 1:2.5 isolation transformer 1:2.5 mil-std-1553 bus a (direct coupled) mil-std-1553 bus b (transformer coupled) mil-std-1553 stub coupler 52.5? 52.5? 1:1.4 figure 3. bus connections example using HI-2579 txa/b txa/b rxa/b rxa/b each bus busa/b busa/b gnd vdd isolation transformer HI-2579 mil-std-1553 transceiver 55? 35? 55? point ?ad? figure 4. direct coupled test circuit txa/b txa/b rxa/b rxa/b each bus busa/b busa/b gnd vdd isolation transformer HI-2579 mil-std-1553 transceiver 70? point ?at? figure 5. transformer coupled test circuit HI-2579, hi-2581
holt integrated circuits 8 ordering information part number lead finish f pb-free, rohs compliant part number temperature range flow lead finish i -40 o c to +85 o c i gold t -55 o c to +125 o c t gold part number rxena = 0 rxenb = 0 rxa rxa rxb rxb 2579 0 0 0 0 2581 1 1 1 1 hi - 25 xx cl x f HI-2579, hi-2581
holt integrated circuits 9 revision history revision date description of change ds2579, rev. new 10/8/12 initial release HI-2579, hi-2581
holt integrated circuits 10 package dimensions bottom view dimensions in inches (mm) .660 .007 (16.76 .18) .218 (5.54) .044 sq. (1.12 sq.) r.017 (r.43) 2x .080 (2.03) .080 (2.03) .060 (1.52) .025 (.64) .183 (4.65) 24x r.008 (r.20) .600 .007 (15.24 .18) .510 .007 (12.95 .18) .050 (1.27) pin 1 index typ. 24x 6x 23x 24x notes: 1. heatsink pad is electrically isolated from the ic die and may be connected to the boards vdd or gnd plane to remove heat. 2. the keep out zones (crosshatched) enclose test pads for the transformer primary windings. do not connect. 3. routing traces under test pads is not recommended. HI-2579, hi-2581
holt integrated circuits 11 package dimensions pin 1 index in topmark .800 .015 (20.32 .38) .440 .015 (11.18 .38) .300 .005 (7.62 .13) .370 .011 (9.40 .28) .070 .007 (1.78 .18) .004 (.10) .005 (.13) max. top view dimensions in inches (mm) HI-2579, hi-2581

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