hi-1570 mil-std-1553 / 1760 5v monolithic dual variable amplitudetransceiver pin configurations description bus to minimize the package size for this function, the transmitter outputs are internally connected to the receiver inputs so that only two pins are required for connection to each coupling transformer. for designs requiring independent access to transmitter and receiver 1553 signals, please contact your holt sales representative. the hi-1570 is a low power cmos dual +5v transceiver with the ability to vary the amplitude of the transmitter outputs. it is designed to meet the requirements of the mil-std-1553 / 1760 specifications. the transmitter section of each channel takes complementary cmos / ttl digital input data and converts it to bi-phase manchester encoded 1553 signals suitable for driving the bus isolation transformer. separate transmitter inhibit control signals are provided for each transmitter. a single pin allows the user to control the transmitter output amplitude. the receiver section of each channel converts the 1553 bi-phase 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 the output of the receiver to a logic ?0?. v a&b 1 busa 2 3 rxena 4 gnda 5 vdda/b 6 busb 7 8 rxenb 9 gndb 10 cont busa busb features compliant to mil-std-1553a & b, mil-std-1760, arinc 708a cmos technology for low standby power single +5v power supply variable transmitter output amplitude smallest footprint available in 20 pin plastic esoic (thermally enhanced soic) package less than 1.0w maximum power dissipation military processing options industry standard pin configurations 20 pin ceramic dip package 20 19 txa 18 txinha 17 rxa 16 15 14 txb 13 txinhb 12 rxb 11 txa rxa txb rxb november 2004 (ds1570 rev. c) 11/04 v a&b 1 busa 2 3 rxena 4 gnda 5 vdda/b 6 busb 7 8 rxenb 9 gndb 10 cont busa busb 20 19 txa 18 txinha 17 rxa 16 15 14 txb 13 txinhb 12 rxb 11 txa rxa txb rxb 20 pin plastic esoic - wb package 1570psi 1570pst 1570psm 1570cdi 1570cdt 1570cdm holt integrated circuits www.holtic.com
pin descriptions pin symbol function description 1 v a/b analog input transmit output amplitude control ( 0 - 5 vdc, see figure 4) 2 busa analog output mil-std-1533 bus driver a, positive signal 3 analog output mil-std-1553 bus driver a, negative signal 4 rxena digital input receiver a enable. if low, forces rxa and low 5 gnda power supply ground for channel a 6 vdda/b 7 busb 9 rxenb 10 gndb 11 12 rxb digital output receiver b output, non-inverted 13 txinhb digital input transmit inhibit, channel b. if high busb, disabled 14 txb digital input transmitter b digital data input, non-inverted 15 digital input transmitter b digital data input, inverted 16 digital output cont busa rxa busb txb rxa power supply +5 volt power for both channel a and channel b analog output mil-std-1533 bus driver b, positive signal 8 analog output mil-std-1553 bus driver b, negative signal digital input receiver b enable. if low, forces rxb and low power supply ground for channel b digital output receiver b output, inverted receiver a output, inverted 17 rxa digital output receiver a output, non-inverted 18 txinha digital input transmit inhibit, channel a. if high busa, disabled 19 txa digital input transmitter a digital data input, non-inverted 20 digital input transmitter a digital data input, inverted busb rxb rxb busa txa functional description busa/b and / v the transmitter is automatically inhibited and placed in the high impedance state when both txa/b and / are ei- ther at a logic ?1? or logic ?0? simultaneously. a logic ?1? ap- plied to the txinha/b input will force the transmitter to the high impedance state, regardless of the state of txa/b and / busa b txa b txa b. cont the hi-1570 data bus transceiver contains differential volt- age source drivers and differential receivers. they are in- tended for applications using a mil-std-1553 a/b data bus. the device produces a trapezoidal output waveform during transmission. data input to the device?s transmitter section is from the complementary cmos / ttl inputs txa/b and / . the transmitter accepts manchester ii bi-phase data and converts it to differential voltages on . the transceiver outputs are either direct or transformer cou- pled to the mil-std-1553 data bus. both coupling meth- ods produce a nominal voltage on the bus of 7.5 volts peak to peak at v a&b = 5.0 vdc. refer to figure 4 for transmitter output amplitudes at other values of a&b between 0 - 5 vdc. (contact your holt sales repre- sentative about the 0 - 10 vdc control voltage option). transmitter txa b cont 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 receiver?s differ- ential input stage drives a filter and threshold comparator that produces cmos/ttl data at the rxa/b and / output pins. rxa b each set of receiver outputs can be independently forced to a logic "0" by setting rxena or rxenb low. a direct coupled interface (see figure 2) uses a 1:2.5 ratio isolation transformer and two 55 ohm isolation resistors between the transformer and the bus. in a transformer coupled interface (see figure 3), the transceiver is connected to a 1:1.79 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. mil-std-1553 bus interface hi-1570 holt integrated circuits 2
transmit waveform - example pattern txa/b txa/b busa/b - busa/b receive waveforms - example pattern rxa/b rxa/b vin (line to line) figure 1. block diagram v a&b cont txa/b txinha/b rxa/b rxa/b rxena/b each channel transmit logic receive logic slope control comparator input filter busa/b busa/b transmitter receiver data bus isolation transformer coupler network direct or transformer hi-1570 txa/b holt integrated circuits 3
parameter symbol condition min typ max units operating voltage vdd 4.75 5 5.25 v total supply current icc1 not transmitting 20 30 ma icc2 transmit one channel @ 340 ma 50% duty cycle icc3 transmit one channel @ 550 ma 100% duty cycle power dissipation pd1 not transmitting 0.11 w pd2 transmit one channel @ 0.70 0.95 w 100% duty cycle min. input voltage (hi) v digital inputs 2.0 1.4 v max. input voltage (lo) v digital inputs 1.4 0.8 v min. input current (hi) i v = 4.9v, digital inputs 20 a max. input current (lo) i v = 0.1v, digital inputs -20 a min. output voltage (hi) v i = -0.4ma, digital outputs 2.7 v max. output voltage (lo) v i = 4.0ma, digital outputs 0.4 v input resistance r differential 20 k input capacitance c differential 5 pf common mode rejection ratio cmrr 40 db input level v differential 9 vp-p input common mode voltage v -5.0 5.0 v-pk threshold voltage - direct-coupled detect 1.15 20.0 no detect 0.28 threshold voltage - detect 0.86 14.0 no detect 0.20 200 400 v 1 mhz sine wave vp-p v (measured at point ?a ? in figure 2) vp-p transformer-coupled v 1 mhz sine wave vp-p v (measured at point ?a ? in figure 3) vp-p ih il ih ih il il oh out ih out d receiver (measured at point ?a ? in figure 2 unless otherwise specified) in in in icm thd thnd thd thnd d t 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. supply voltage ( logic input voltage range power dissipation at 25c 1.0 w ceramic dil, derate 7mw/c solder temperature 275c for 10 sec. junction temperature 175c storage temperature -65c to +150c vdd) -0.3 v to +7 v -0.3 v dc to +5.5 v receiver differential voltage 10 vp-p driver peak output current +1.0 a absolute maximum ratings recommended operating conditions supply voltage temperature range industrial screening.........-40c to +85c hi-temp screening........-55c to +125c military screening..........-55c to +125c vdd....................................... 5v... 5% dc electrical characteristics vdd = 5.0v, gnd = 0v, v a/b = 5.0v, t = operating temperature range (unless otherwise specified). cont a hi-1570 holt integrated circuits 4
parameter symbol test conditions min typ max units receiver enable delay tren from rxena/b rising or falling edge to 40 ns rxa/b or driver delay tdt txa/b, txa/b to busa/b, busa/b 150 ns rise time tr 35 ohm load 100 300 ns fall time tf 35 ohm load 100 300 ns inhibit delay tdi-h inhibited output 100 ns tdi-l active output 150 ns receiver transmitter (measured at point ?a ? in figure 2) (measured at point ?a ? in figure 2) d d receiver delay tdr from input zero crossing to rxa/b or 450 ns rxa/b rxa/b ac electrical characteristics vdd = 5.0v, gnd = 0v, v a/b = 5.0v, t =operating temperature range (unless otherwise specified). cont a parameter symbol condition min typ max units output voltage direct coupled 35 load 7.0 9.0 vp-p (measured at point ?a ? in figure 2) 70 20.0 27.0 vp-p output noise v differential, inhibited 10.0 mvp-p output dynamic offset voltage v -90 90 mv -250 250 mv output resistance r differential, not transmitting 10 k output capacitance c 1 mhz sine wave 15 pf control line resistance r 5 transmitter (measured at point ?a ? in figure 2 unless otherwise specified) d d v transformer coupled v load (measured at point ?a ? in figure 3) direct coupled 35 load (measured at point ?a ? in figure 2) transformer coupled v 70 load (measured at point ?a ? in figure 3) k out out dyn t d t on dyn out out cont dc electrical characteristics (cont.) vdd = 5.0v, gnd = 0v, v a/b = 5.0v, t = operating temperature range (unless otherwise specified). cont a txa/b txa/b v a&b cont transmitter receiver 1:2.5 point ?a ? d 55 55 35 2.5:1 55 55 35 rxena/b busa/b busa/b rxa/b rxa/b figure 2. direct coupled test circuits hi-1570 isolation transformer isolation transformer point ?a ? d txinha/b 2.5:1 holt integrated circuits 5
fs 0.8fs 0.6fs 0.4fs 0.2fs 0 fs 0.8fs 0.6fs 0.4fs 0.2fs 0 0 1.0 2.0 3.0 4.0 5.0 7.5 6.0 4.5 3.0 1.5 0 7.5 6.0 4.5 3.0 1.5 0 control voltage - v a&b cont control voltage - v a&b cont figure 4. transmitter output amplitude (vo) vs v a&b voltage cont output amplitude (vo p-p @ point a) d txa/b txa/b v a&b cont transmitter busa/b busa/b 52.5 (.75 zo) 52.5 (.75 zo) 1.79:1 1:1.79 1:1.4 1.4:1 35 (.5 zo) figure 3. transformer coupled test circuits hi-1570 coupling transformer coupling transformer isolation transformer isolation transformer receiver 52.5 (.75 zo) 52.5 (.75 zo) 35 (.5 zo) rxa/b rxa/b rxena/b point ?a ? t point ?a ? t txinha/b slope = vo v a&b cont holt integrated circuits 6
hi-1570 thermal characteristics part number package condition ? junction temperature description t =25c t =85c t =125c ja aaa heat sink hi-1570psi 20 pin thermally 54c/w 66c 126c 166c hi-1570pst enhanced plastic unsoldered hi-1570psm soic (esoic) heat sink soldered hi-1570cdi HI-1570CDT socketed 62c/w 72c 132c 172c hi-1570cdm side-brazed dip data taken at vdd=5.0v, continuous transmission at 1mbit/s, single transmitter enabled. 47c/w 61c 121c 161c 20 pin ceramic recommended transformers the hi-1570 transceiver has been characterized for compliance with the electrical requirements of mil-std- 1553 when used with the following transformers. holt manufacturer part number application turns ratio(s) dimensions technoltrol tl1553-45 isolation dual tapped 1:1.79, 1:2.5 .630 x .630 x .155 inches premier magnetics pm-db2725ex isolation dual tapped 1:1.79, 1:2.5 .500 x .500 x .375 inches technoltrol tq1553-2 stub coupling 1:1.4 .625 x .625 x .250 inches premier magnetics pm-db2702 stub coupling 1:1.4 .625 x .500 x .250 inches recommends the premier magnetics parts as offering the best combination of electrical performance, low cost and small footprint. heat sink - esoic package the hi-1570psi/t/m all use a 20-pin thermally enhanced soic package. the package include a metal heat sink located on the bottom surface of the device. the heat sink should be soldered down to the printed circuit board for optimum thermal dissipation. the heat sink is also electrically isolated and may be soldered to any convenient power or ground plane. applications note holt applications note an-500 provides circuit design notes regarding the use of holt's family of mil-std-1553 transceivers. layout considerations, as well as recommended interface and protection components are included. holt integrated circuits 7
hi-1570psi 0 20 pin plastic esoic - wb -40c to +85c i no solder hi-1570pst 0 20 pin plastic esoic - wb -55c to +125c t no solder hi-1570psm 0 20 pin plastic esoic - wb -55c to +125c m yes solder hi-1570cdi 0 20 pin ceramic side brazed dip -40c to +85c i no gold HI-1570CDT 0 20 pin ceramic side brazed dip -55c to +125c t no gold hi-1570cdm 0 20 pin ceramic side brazed dip -55c to +125c m yes solder part idle package temperature process burn lead number state description range flow in finish ordering information legend: wb - wide body esoic - thermally enhanced small outline package (soic w/built-in heat sink) hi-1570 holt integrated circuits 8
.5035 .0075 (12.789 .191) .296 .003 (7.518 .076) .050 (1.27) 0 to 8 .090 .010 (2.286 .254) typ .018 (.457) typ. see detail a detail a package type: 20-pin plastic small outline (esoic) - wb (wide body, thermally enhanced) 24hew .215 (5.461) typ. .300 (7.620) typ. heat sink stud on bottom of package. bottom view top view .4065 .0125 (10.325 .318) .033 .017 (.838 .432) .0075 .0035 (.191 .889) .0105 .0015 (.2667 .0381) package dimensions inches (millimeters) holt integrated circuits 9 pt: ackage ype .017 .002 (.432 .051) .100 .005 (2.540 .127 .310 010 (7.874 .254) .125 min. (3.175 min.) .050 typ. (1.270 typ.) .200 max. (5.080 max.) 1.000 .010 (25.400 .254) .010 +. 002/ - .001 (.254 + .051 /- .025) .300 010 (7.620 .254) .085 .009 (2.159 .229) 20-pin ceramic side-brazed dip 20c .025 (.635) min.. .025 (.635) min..
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