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1 standard products ut63m14x mil-std-1553a/b bus transceiver data sheet sept. 1999 features q 5-volt only operation ( + 10%) q completely monolithic bipolar technology q fit and functionally compatible to industry standard transceiver q idle low transmitter inputs and receiver outputs q dual-channel 50-mil center 24-lead flatpack q dual-channel 100-mil center 36-pin dip q full military operating temperature range, -55 c to +125 c, screened to qml q or qml v requirements q radiation hardened to 1.0e6 rads(si) q supports mil-std-1760 (ut63m145) and mil-std-1553 (ut63m147) q standard microcircuit drawing (smd) 5962-93226 available introduction the monolithic ut63m14x transceivers are complete transmitter and receiver pairs for mil-std-1553a and 1553b applications. encoder and decoder interfaces are idle low. the receiver section of the ut63m14x series accepts biphase- modulated manchester ii bipolar data from a mil-std-1553 data bus and produces ttl-level signal data at its rxout and rxout outputs. an external rxen input enables or disables the receiver outputs. txin rxout rxen from encoder to decoder drivers compare f ilter limiter and f ilter txihb figure 1. functional block diagram rxin txout rxin txout rxout txin threshold reference
2 the transmitter section accepts biphase ttl-level signal data at its txin and txin and produces mil-std-1553 data signals. the transmitter?s output voltage is typically 12 v pp, l-l . activating the txihb input or setting both data inputs to the same logic level disables the transmitter outputs. the ut63m14x series offers complete transmitter and receiver pairs packaged in a dual-channel 36-pin dip or 24-lead flatpack configurations designed for use in any mil-std-1553 application. legend for type field: ti = ttl input to = ttl output do = differential output di = differential input dio = differential input/output ( ) = channel designator [ ] = 24-lead flatpack transmitter note: 1. the 24-lead flatpack internally connects txout to rxin (cha, chb) and txout to rxin ( cha , chb ) for each channel. name pin number type description txout 1 (a) txout (b) 1 [1] 10 [7] do [dio] do [dio] transmitter outputs: txout and txout are differential data signals. txout 1 (a) txout (b) 2 [2] 11 [8] do [dio] do [dio] txout is the half-cycle complement of txout. txihb (a) txihb (b) 34 [22] 25 [16] ti ti transmitter inhibit: this is an active high input signal. txin (a) txin (b) 35 [23] 26 [17] ti ti transmitter input: txin and txin are complementary ttl- level manchester ii encoder inputs. txin (a) txin (b) 36 [24] 27 [18] ti ti txin is the complement of txin input.
3 receiver note: 1. the 24-lead flatpack internally connects txout to rxin (cha, chb) and txout to rxin ( cha , chb ) for each channel. power and ground name pin number type description rxout (a) rxout (b) 5 [4] 14 [10] to to receiver outputs: rxout and rxout are complementary manchester ii decoder outputs. rxout (a) rxout (b) 8 [6] 17 [12] to to rxout is the complement of rxout output. rxen (a) rxen (b) 6 [5] 15 [11] ti ti receiver enable/disable: this is an active high input signal. rxin 1 (a) rxin (b) 29 [1] 20 [7] di [dio] di [dio] receiver input: rxin and rxin are biphase-modulated manchester ii bipolar inputs from mil-std-1553 data bus. rxin 1 (a) rxin (b) 30 [2] 21 [8] di [dio] di [dio] rxin is the half-cycle complement of rxin input. name pin number type description v cc (a) v cc (b) 33 [20] 24 [14] pwr pwr +5 v dc power ( 10%) gnd (a) gnd (b) 3, 7, 31 [3,19,21] 12, 16, 22 [9,13,15] gnd gnd ground reference
4 36 26 10 11 13 14 15 17 18 16 27 28 35 34 33 32 31 30 29 25 24 23 22 21 20 19 1 2 3 4 5 6 7 8 9 12 txout rxout txout gnd nc rxout rxen gnd nc txout rxout txout gnd nc rxout rxen gnd nc txin rxin v cc txin txihb nc gnd rxin nc txin rxin v cc txin txihb nc gnd rxin nc channel a channel b figure 2a. functional pin diagram -- dual channel (36) 24 17 7 8 10 11 12 18 23 22 21 20 19 16 15 14 13 1 2 3 4 5 6 9 cha cha gnd rxout rxen chb chb gnd rxout rxen txin v cc txin txihb gnd txin v cc txin txihb gnd channel a channel b figure 2b. functional pin diagram -- dual channel (24) 1 rxout rxout gnd gnd note: 1. the 24-lead flatpack internally connects txout to rxin (cha, chb) and txout to rxin ( cha , chb ) for each channel.
5 transmitter the transmitter section accepts manchester ii biphase ttl data and converts this data into differential phase-modulated current drive. transmitter current drivers are coupled to a mil-std- 1553 data bus via a transformer driven from the txout and txout terminals. transmitter output terminals? non- transmitting state is enabled by asserting txihb (logic ?1?), or by placing both txin and txin at the same logic level. table 1, transmit operating mode, lists the functions for the output data in reference to the state of txihb. figure 3 shows typical transmitter waveforms. receiver the receiver section accepts biphase differential data from a mil-std-1553 data bus at its rxin and rxin inputs. the receiver converts input data to biphase manchester ii ttl format and is available for decoding at the rxout and rxout terminals. the outputs rxout and rxout represent positive and negative excursions (respectively) of the inputs rxin and rxin . figure 4 shows typical receiver output waveforms. table 1. transmit operating mode notes: 1. x = don?t care. 2. transmitter output terminals are in the non-transmitting mode during off-time. 3. transmitter output terminals are in the non-transmitting mode during off-time, independent of txihb status. figure 3. typical transmitter wave figure 4. typical receiver waveforms txin txin txihb txout x 1 x 1 0 0 x 0 1 0 1 0 0 1 1 x 90% 10% txout , txout txin txin line-to-line differential output txin txihb txin t txdd both high or both low rxout rxout rxout rxout line-to-line differential input t rxdd note: off 2 off 3 off 3 on on
6 data bus interface 1 the designer can connect the ut63m14x to the data bus via a short-stub (direct-coupling) connection or a long-stub (transformer-coupling) connection. use a short-stub connection when the distance from the isolation transformer to the data bus does not exceed a one-foot maximum. use a long-stub connection when the distance from the isolation transformer exceeds the one-foot maximum and is less than twenty feet. figure 5 shows various examples of bus coupling configurations. the ut63m14x series transceivers are designed to function with mil-std-1553a and 1553b compatible transformers. note: 1. the 24-lead flatpack internally connects txout to rxin and txout to rxin for each channel. recommended thermal protection all packages should mount to or contact a heat removal rail located in the printed circuit board. to insure proper heat transfer between the package and the heat removal rail, use a thermally- conductive material between the package and the heat removal rail. use a material such as mereco xln-589 or equivalent to insure heat transfer between the package and heat removal rail. figure 8. transceiver test circuit mil-std-1553b figure 5. bus coupling configuration 55 ohms 55 ohms 20 ft max 1:1.4 note: z o defined per mil-std-1553b, section 4.5.1.5.2.1. z o z o +5v dc operation 1:1.79 1:2.5 short-stub direct coupling 1 ft. max. long-stub transformer coupling .75 z o .75 z o txout rxin rxin txout
7 rl = 15 pf 15 pf 55 ohms 55 ohms 35 ohms a receiver transmitter tp tp * rxin rxen rxout figure 6. direct coupled transceiver with load 55 ohms 55 ohms 35 ohms txout txin rxin rxout txin txihb txout 2kohms 2kohms 2.5:1 1:2.5 notes: 1. tp = test point. 2. rl removed for terminal input impedance test. 3. txout and rxin tied together. txout and rxin tied together. v in v cc 1:1.4 15 pf 15 pf receiver tp tp transmitter 35 ohms a b rxen 1.79:1 1.4:1 rxout v * cc 1:1.79 rxin rxin txin txin txihb txout txout rxout 2kohms 2kohms notes: 1. tp = test point. 2. rl removed for terminal impedance test. 3. txout and rxin tied together. txout and rxin tied together. figure 7. transformer coupled transceiver with load .75 z o .75 z o v in
8 absolute maximum ratings 1 notes: 1. stress outside the listed absolute maximum rating may cause permanent damage to the devices. this is a stress rating only, and f unctional operation of the device at these or any other conditions beyond limits indicated in the operational sections of this specification is not recommend ed. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2. mounting per mil-std-883, method 1012. recommended operating conditions parameter limits unit v cc -0.3 to +7.0 v input voltage range (receiver) 10 v pp, l-l logic input voltage range -0.3 to +5.5 v power dissipation 100% duty cycle (per channel) 3.6 w thermal impedance junction to case 2 6.0 c/w maximum junction temperature +175 c storage temperature -65 to +150 c receiver common mode input voltage range -5.0 to +5.0 v parameter limits unit supply voltage range +4.50 to +5.50 v logic input voltage range 0 to +5.0 v receiver differential voltage 8.0 v p-p receiver common mode voltage range + 4.0 v driver peak output current 600 ma serial data rate 0.3 to 1 mhz case operating temperature range (t c ) -55 to +125 c a terminal notes: 1. transformer coupled stub: terminal is defined as transceiver plus isolation transformer. point a is defined in figure 7. 2. direct coupled stub: terminal is defined as transceiver plus isolation transformer and fault resistors. point a is defined in figure 6. rl txout txout figure 8. transceiver test circuit mil-std-1553
9 dc electrical characteristics 1 v cc = 5.0v 10% -55 c < t c < +125 c note: 1. all tests guaranteed per test figure 6. 2. guaranteed but not tested. symbol parameter minimum maximum unit condition v il input low voltage 0.8 v rxen, txihb, txin, txin v ih input high voltage 2.0 v rxen, txihb, txin, txin i il input low current -0.1 ma v il = 0.4v; rxen, txihb, txin, txin i ih input high current -40 40 m a v ih = 2.7v; rxen, txihb, txin, txin v ol output low voltage .55 v i ol = 4ma; rxout, rxout v oh output high voltage 2.4 v i oh = 0.4ma; rxout, rxout i cc v cc supply current 22 200 380 650 740 ma ma ma ma ma 0% duty cycle (non-transmitting) 25% duty cycle ( | = 1mhz) 50% duty cycle ( | = 1mhz) 87.5% duty cycle ( | = 1mhz) 100% duty cycle ( | = 1mhz) 2
10 receiver electrical characteristics 1 v cc = 5.0v 10% -55 c < t c < +125 c notes: 1. all tests guaranteed per test figure 6. 2. capacitance is measured only for initial qualification and after any process or design changes which may affect input or output capacitance. 3. pass/fail criteria per the test method described in mil-hdbk-1553 appendix a, rt validation test plan, section 5.1.2.2, common m ode rejection. 4. guaranteed by design. 5. guaranteed to the limits specified if not tested. symbol parameter minimum maximum unit condition c in 2 input capacitance 15 pf rxen; input | = 1mhz @ 0v c out 2 output capacitance 20 pf rxout, rxout ; | = 1mhz @ 0v v ic 5 common mode input voltage -5 5 v direct-coupled stub; input 1.2 v pp , 200ns rise/fall time 25ns, | = 1mhz v th input threshold voltage 4 (no response) input threshold voltage (no response) input threshold voltage 4 (response) input threshold voltage (response) 0.86 1.20 0.20 0.28 14.0 20.0 2 v pp,l-l v pp,l-l v pp,l-l v pp,l-l transformer-coupled stub; input at | = 1mhz, rise/fall time 200ns at (receiver output 0 ? 1 transition) direct-coupled stub; input at | = 1mhz, rise/fall time 200ns at (receiver output 0 ? 1 transition) transformer-coupled stub; input at | = 1mhz, rise/fall time 200ns at (receiver output 0 ? 1 transition) direct-coupled stub; input at | = 1mhz, rise/fall time 200ns at (receiver output 0 ? 1 transition) cmrr 5 common mode rejection ratio pass/fail 3 n/a
11 transmitter electrical characteristics 1 v cc = 5.0v 10% -55 c < t c < +125 c notes: 1. all tests guaranteed per test figure 6. 2. guaranteed by device characterization. capacitance is measured only for initial qualification and after any process or design ch anges which may affect input or output capacitance. 3. for mil-std-1760, 22 vp-p, l-l min. 4. test in accordance with the method described in mil-std-1553b output symmetry, section 4.5.2.1.1.4. 5. guaranteed to the limits specified if not tested. symbol parameter minimum maximum unit condition v o output voltage swing per mil-std-1553b 3, 5 (see figure 9) per mil-std-1553b (see figure 9) per mil-std-1553a 5 (see figure 9) 18 6.0 6.0 27 9.0 20 v pp,l-l v pp,l-l v pp,l-l transformer-coupled stub, figure 8, point a; input | = 1mhz, r l = 70 ohms direct-coupled stub, figure 8, point a; input | = 1mhz, r l = 35 ohms figure 7, point a; input | = 1mhz, r l = 35 ohms v ns 2 output noise voltage differential (see figure 9) 14 5 mv-rms l-l mv-rms l-l transformer-coupled stub, figure 8, point a; input | = dc to 10mhz, r l = 70 ohms direct-coupled stub, figure 8, point a; input | = dc to 10mhz, r l = 35 ohms v os 4 output symmetry -250 -90 +250 +90 mv pp,l-l mv pp,l-l transformer-coupled stub, figure 8, point a; r l = 140 ohms, measurement taken 2.5 m s after end of transmission direct-coupled stub, figure 8, point a; r l = 35 ohms, measurement taken 2.5 m s after end of transmission v dis output voltage distortion (overshoot or ring) (see figure 9) -900 -300 +900 +300 mv peak,l-l mv peak,l-l transformer-coupled stub, figure 8, point a; r l = 70 ohms direct-coupled stub, figure 8, point a; r l = 35 ohms c in 2 input capacitance 15 pf rxen, txihb, txin, txin ; input | = 1mhz @ 0v t iz 5 terminal input impedance 1 2 kohm kohm transformer-coupled stub, figure 7, point a; input | = 75khz to 1mhz (power on or power off; non- transmitting, r l removed from circuit). direct-coupled stub, figure 6, point a; input | = 75khz to 1mhz (power on or power off; non-transmitting, r l removed from circuit).
12 ac electrical characteristics 1 v cc = 5.0v 10% -55 c < t c < +125 c notes : 1. all tests guaranteed per test figure 6. 2. guaranteed by device characterization. 3. supplied as a design limit but not guaranteed or tested. 4. delay time from transmit inhibit (1.5v) rising to transmit off (280mv). 5. delay time from not transmit inhibit (1.5v) falling to transmit off (1.2v). symbol parameter minimum maximum unit condition t r, t f transmitter output rise/ fall time (see figure 10) 100 300 ns input | = 1mhz 50% duty cycle: direct-coupled r l = 35 ohms output at 10% through 90% points txout, txout . figure 10. t rxdd rxout delay -200 200 ns rxout to rxout , figure 4. t txdd 3 txin skew -25 25 ns txin to txin , figure 3. t rzcd zero crossing distortion (see figure 11) -150 150 ns direct-coupled stub; input | = 1mhz, 3 v pp (skew input 150ns), rise/fall time 200ns. t tzcs zero crossing stability (see figure 11) -25 25 ns input txin and txin should create transmitter output zero crossings at 500ns, 1000ns, 1500ns, and 2000ns. these zero crossings should not deviate more than 25ns. t rdxoff 3,4 transmitter off; delay from inhibit active 100 ns txin and txin toggling @ 1mhz; txihb transitions from logic zero to one, see figure 12. t dxon 3,5 transmitter on; delay from inhibit inactive 150 ns txin and txin toggling @ 1mhz; txihb transitions from logic one to zero, see figure 13. t rcvoff 3 receiver off 50 ns receiver turn off time, see figure 13. t rcvon 3 receiver on 50 ns receiver turn on time, see figure 13. t rcvpd 3 receiver propagation 450 ns receiver propagation delay, see figure 13. t xmitpd 3 transmitter propagation 200 ns transmitter propagation delay, see figure 12. table 2. transformer requirements coupling technique 5v dc direct-coupled: isolation transformer ratio 2.5:1 transformer-coupled: isolation transformer ratio 1.79:1 coupling transformer ratio 1:1.4
13 figure 9. transmitter output characteristics (v dis , v ns , v o ) figure 10. transmitter output zero crossing stability, rise time, fall time (t tzcs , t r , t f ) figure 11. receiver input zero crossing distortion (t rzcd ) 0 volts 0 volts v dis (ring) v dis (overshoot) v o v ns 90% 10% 10% 90% v o t r t f t tzcs t rzcd v in
14 10% 50% 50% 50% zero crossing t dxon t xmitpd t dxoff tx output inhibit tx in and tx in figure 12. transmitter timing 50% 50% 50% 50% 50% t rcvpd t rcvon t rcvoff zero crossing rx input rxen rx out and rx out rxen figure 13. receiving timing 10%
figure 14. 36-pin side-brazed dip, dual cavity notes: 1. package material: opaque ceramic. 2. all package finishes are per mil-prf-38535. 3. it is recommended that package ceramic be mounted on a heat removal rail in the printed circuit board. a thermally conductive material should be used. lead 1 indicator 0.005 min. .610 max. .570 min. .015 max. .008 min. .620 max. .590 min. (at seating plane) 1.89 max. 0.001 min. .023 max. .014 min. 0.155 max. 0.150 min. 0.100
16 figure 15. 24-lead flatpack, dual cavity (50-mil lead spacing) notes: 1. package material: opaque ceramic. 2. all package plating finishes are per mil-prf-38535. 3. it is recommended that package ceramic be mounted to a heat removal rail located in the printed circuit board. a thermally conductive material should be used. .810 max. .600 max. .400 min. lead 1 indicator 0.130 max. 0.070 0.010 (at ceramic body) .050 0.016 .002 .010 + .002 - .001
17 ordering information ut63m monolithic transceiver, 5v operation: smd lead finish: (a) = solder (c) = gold (x) = optional case outline: (x) = 36 pin dip (z) = 24 pin fp class designator: (q) = class q (v) = class v device type (03) = idle low (04) = 1760, idle low drawing number: 93226 total dose: (h) = 1e6 rads(si) (g) = 5e5 ads(si) (f) = 3e5 rads(si) (r) = 1e5rads(si) (-) = none federal stock class designator: no options 5962 * 93226 * * * * notes: 1. lead finish (a, c, or x) must be specified. 2. if an "x" is specified when ordering, part marking will match the lead finish and will be either "a" (solder) or "c" (gold). 3. total dose must be specified for all qml q and qml v devices. 4. neutron irradiation limits will be added when available.
18 ut63m monolithic transceiver, 5v operation total dose: () = none lead finish: (a) = solder (c) = gold (x) = optional screening: (c) = military temperature (p) = prototype package type: (b) = 36-pin dip (c) = 24-pin fp device type modifier: 147 = idle low transceiver 145 = 1760, idle low transceiver ut63m- * * * * notes: 1. lead finish (a, c, or x) must be specified. 2. if an "x" is specified when ordering, part marking will match the lead finish and will be either "a" (solder) or "c" (gold). 3. military temperature range devices are burned-in and tested at -55 c , room temperature, and 125 c . radiation characteristics are neither tested nor guaranteed and may not be specified. 4. devices have prototype assembly and are tested at 25 c only. radiation characteristics are neither tested nor guaranteed and may not be specified. lead finish is gold only.

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