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XR-T5793 ...the analog plus company tm quad e1 line interface unit rev. 2.00 1995 exar corporation, 48720 kato road, fremont, ca 94538 (510) 668-7000 fax (510) 668-7017 1 june 1997-3 features meets ccitt g.703 pulse mask template for 2.048mbps (e1) rates transmitter and receiver interfaces can be: single ended, 75 w capacitive or transformer coupled balanced, 100 w or 120 w transformer coupled minimum return loss is 20db (receive) and 18db (transmit), exceeds g.703 and etsi 300 166 specifications bipolar outputs can be disabled individually (high z outputs) system interface is ttl compatible on digital input and ttl/cmos compatible on digital output pins individual channel loss of signal detection, local and remote digital loopback low power, cmos technology over-temperature protection applications multi-line e1 interface cards e1 network equipment multiplexers cross connects switching systems fault tolerant systems general description the XR-T5793 is an optimized line interface unit, built using low power cmos technology. this device contains four independent e1 channels for primary rate, pcm applications up to 2.048mbps. each channel performs the driver and receiver functions necessary to convert bipolar signals to ttl/cmos compatible logic levels and vice versa. the device supports single ended or balanced line interfaces on each channel, thereby providing the user an option of reducing system cost and board space by replacing the transformer with a capacitor. each of the four drivers can be independently disabled, allowing maximum flexibility in system power management. output pulses are fully ccitt g.703 compliant. moreover, the return loss is at least 18db over a frequency range of 51khz to 3.072mhz. the slicing circuit in the receive path is able to tolerate a maximum of 12db of cable loss with a minimum input sensitivity of 600mv over the operating temperature range. return loss on the receive interfaces is minimum 20db from 51khz to 3.072mhz. local and remote loopbacks can be performed on any of the four channels. a separate loss of signal (los) detection circuitry and a los pin is provided for each input. the XR-T5793 is targeted for multi-line e1 line card applications where real estate and low power consumption are critical. also, the device may be used in t1 applications (1.544mbps) which do not require meeting the dsx-1 cross connect pulse template. the XR-T5793 is pin compatible with the xr-t5794, which supports a fifth channel. the fifth channel is for redundancy and dedicated monitoring on any of the eight bipolar paths. ordering information part no. package operating temperature range XR-T5793ij 68 lead plcc -40 c to +85 c XR-T5793iv 80 lead tqfp (14 x 14 x 1.4 mm) -40 c to +85 c
XR-T5793 2 rev. 2.00 block diagram 0.1 m f tip rx input tip ring tx output tip ring tip 0.1 m f 75 rxin 100 or 120 loopen e1/t1- loopsel (1.0) txout txen rout 1 level detector transceiver 4 los rxpos rxneg txneg slicer peak detector slice voltage txpos tclk driver l o c a l / r e m o t e l o o p b a c k transceiver 3 transceiver 2 transceiver 1 figure 1. block diagram impedance selectable receivers. return loss exceeds g7.03. 120 w balanced (or 100 w ) los threshold based on g.775 impedance selectable tristate drivers return loss exceeds etsi 300 166 120 w ,100 w or 75 w balanced 75 w unbalanced (without transformer) 75 w unbalanced (without transformer) r out 1 lpmod note 1 r out = 68 w for 120 w line impedance, r out = 62 w for 100 w line impedance, r out = 68 w for 75 w line impedance pe-65834 tti-7148 pe-65839 tti-7149
XR-T5793 3 rev. 2.00 pin configuration 68 lead plcc txen3 txen4 txout4 tv tv txout3 agnd tv nc tv agnd txout2 tv txout1 txen1 txen2 lpmod4 lpmod3 rxin4 los4 los3 rxin3 nc nc rgnd rgnd nc rxin2 los1 los2 rxin1 lpmod2 lpmod1 loslvs txclk2 txpos2 txneg2 txclk1 txpos1 txneg1 loopen2 loopen1 e1/t1 rxpos2 rxneg2 rxpos1 rxneg1 nc txclk4 txpos4 txneg4 txclk3 txpos3 txneg3 loopen4 loopen3 gnd rxpos3 rxneg3 rxpos4 rxneg4 tv dd ss ss dd av ss v ss rv ss v dd rv dd 80 lead tqfp (14 x 14 x 1.4 mm) 60 41 40 21 120 61 80 nc av av txclk4 txpos4 txneg4 txclk3 txpos3 txneg3 loopen4 loopen3 gnd v rxpos3 rxneg3 rxpos4 rxneg4 rv lpmod4 lpmod3 rxin4 los4 los3 rxin3 rgnd rgnd rgnd rxin2 los1 los2 rxin1 lpmod2 nc nc rv rxneg1 rxpos1 rxneg2 rxpos2 v e1/t1- loopen1 loopen2 txneg1 txpos1 txclk1 txneg2 txpos2 txclk2 av loslvs dd dd dd dd rv dd ss rv ss ss ss av ss av ss nc nc txen2 txen1 txout1 tv dd tv ss txout2 agnd tv dd agnd txout3 tv ss tv dd txout4 txen4 txen3 nc tv ss dd ss nc nc nc nc lpmod1 nc av dd 1 961 60 44 43 27 26 10
XR-T5793 4 rev. 2.00 pin description plcc pin # sqfp pin # symbol type description 1 71 nc no connect. 2 72 tv dd v dd transmit v dd. 5v ( 5%). 3 73 agnd gnd analog ground. 4 74 txout3 o transmitter 3 output. transmitter 3 bipolar output connected to coupling capacitor or pulse transformer by a resistor. 5 75 tv ss v ss transmit v ss. -5v ( 5%). 6 76 tv dd v dd transmit v dd. +5v ( 5%). 7 77 txout4 o transmitter 4 output. transmitter 4 bipolar output connected to coupling capacitor or pulse transformer by a resistor. 8 78 txen4 i transmitter 4 output enable. if driven high the transmitter 4 output drivers are enabled. hi-z otherwise. 9 79 txen3 i transmitter 3 output enable. if driven high the transmitter 3 output drivers are enabled. hi-z otherwise. 10 1, 2, 80 nc nc no connect. 11 3,4 av dd v dd analog v dd. 12 5 txclk4 i transmitter 4 clock input. apply logic one when rz signals are supplied to data inputs. 13 6 txpos4 i transmitter 4 positive data in. positive data input in nrz or rz format for transmitter 4. 14 7 txneg4 i transmitter 4 negative data in. negative data input in nrz or rz format for transmitter 4. 15 8 txclk3 i transmitter 3 clock input. apply logic one when rz signals are supplied to data inputs. 16 9 txpos3 i transmitter 3 positive data in. positive data input in nrz or rz format for transmitter 3. 17 10 txneg3 i transmitter 3 negative data in. negative data input in nrz or rz format for transmitter 3. 18 11 loopen4 i loop enable 4. if driven high the specified loop type will be enabled for channel 4. otherwise normal operation will continue. 19 12 loopen3 i loop enable 3. if driven high the specified loop type will be enabled for channel 3. otherwise normal operation will continue. 20 13 gnd gnd digital ground. 21 14 v dd v dd digital v dd . +5v ( 5%). 22 15 rxpos3 o receiver 3 positive data out. positive data output in nrz or rz format for receiver 3. 23 16 rxneg3 o receiver 3 positive data out. negative data output in nrz or rz format for receiver 3. 24 17 rxpos4 o receiver 4 positive data out. positive data output in nrz or rz format for receiver 4. 25 18 rxneg4 o receiver 4 positive data out. negative data output in nrz or rz format for receiver 4. 26 19,20 rv dd v dd receive v dd. +5v ( 5%).
XR-T5793 5 rev. 2.00 pin description (cont'd) plcc pin # sqfp pin # symbol type description 27 21 lpmod4 i loop mode 4. if driven high the loopback mode of channel 4 will be set to re- mote loop. otherwise theloopback mode will remain at local loop. the actualloopback will be activated when the loopen4 is asserted. 28 22 lpmod3 i loop mode 3. if driven high the loopback mode of channel 3 will be set to re- mote loop. otherwise the loopback mode will remain at local loop. the actual loopback will be activated when the loopen3 is asserted. 29 23 rxin4 i receiver 4 input. receiver 4 bipolar input connected to coupling capacitor or pulse transformer. 30 24 los4 o receiver 4 loss of signal. asserted during los condition. clear otherwise. 31 25 los3 o receiver 3 loss of signal. asserted during los condition. clear otherwise. 32 26 rxin3 i receiver 3 input. receiver 3 bipolar input connected to coupling capacitor or pulse transformer. 33 27 nc no connect. 34 28 nc no connect. 35 29, 30 rgnd gnd receive ground. 36 31 rgnd gnd receive ground. 37 32 nc no connect. 38 33 rxin2 i receiver 2 input. receiver 2 bipolar input connected to coupling capacitor or pulse transformer. 39 34 los1 o receiver 1 loss of signal. asserted during los condition. clear otherwise. 40 35 los2 o receiver 2 loss of signal. asserted during los condition. clear otherwise. 41 36 rxin1 i receiver 1 input. receiver 1 bipolar input connected to coupling capacitor or pulse transformer. 42 37 lpmod2 i loop mode 2. if driven high the loopback mode of channel 2 will be set to re- mote loop. otherwise the loopback mode will remain at local loop. the actual loopback will be activated when the loopen2 is asserted. 43 38 lpmod1 i loop mode 1. if driven high the loopback mode of channel 1 will be set to re- mote loop. otherwise the loopback mode will remain at local loop. the actual loopback will be activated when the loopen1 is asserted. - 39, 40 nc nc no connect. 44 41,42 rv ss v ss receive v ss. -5v ( 5%). 45 43 rxneg1 o receiver 1 negative data out. negative data output in nrz or rz format for receiver 1. 46 44 rxpos1 o receiver 1 positive data out. positive data output in nrz or rz format for receiver 1. 47 45 rxneg2 o receiver 2 negative data out. negative data output in nrz or rz format for receiver 2. 48 46 rxpos2 o receiver 2 positive data out. positive data output in nrz or rz format for receiver 2. 49 47 v ss v ss digital v ss. -5v ( 5%). 50 48 e1/t1- i e1/t1- selection. apply logic one to select the receive data threshold appropriate for e1 operation. connect to ground to select the t1 data threshold.
XR-T5793 6 rev. 2.00 pin description (cont'd) plcc pin # sqfp pin # symbol type description 51 49 loopen1 i loop enable 1. if driven high the specified loopback mode will be enabled for channel 1. otherwise normal operation will continue. 52 50 loopen2 i loop enable 2. if driven high the specified loopback mode will be enabled for channel 2. otherwise normal operation will continue. 53 51 txneg1 i transmitter 1 negative data in. negative data input in nrz or rz format for transmitter 1. 54 52 txpos1 i transmitter 1 positive data in. positive data input in nrz or rz format for transmitter 1. 55 53 txclk1 i transmitter 1 clock input. apply logic one when rz signals are supplied to data inputs. 56 54 txneg2 i transmitter 2 negative data in. negative data input in nrz or rz format for transmitter 2. 57 55 txpos2 i transmitter 2 positive data in. positive data input in nrz or rz format for transmitter 2. 58 56 txclk2 i transmitter 2 clock input. apply logic one when rz signals are supplied to data inputs. 59 57,58,59 av ss v ss analog v ss. 60 60 loslvs i loss of signal voltage select. apply logic one to select los voltage level appropriate for 120 w balanced receiver operation. connect to ground to choose los voltage for 75 w unbalanced operation. - 61, 62 nc nc no charge. 61 63 txen2 i transmitter 2 output enable. if asserted the transmitter 2 output drivers are enabled. high-z otherwise. 62 64 txen1 i transmitter 1 output enable. if asserted the transmitter 1 output drivers are enabled. high-z otherwise. 63 65 txout1 o transmitter 1 output. transmitter 1 bipolar output connected to coupling capacitor or pulse transformer through a resistor. 64 66 tv dd v dd transmit v dd . +5v ( 5%). 65 67 tv ss v ss transmit v ss . -5v ( 5%). 66 68 txout2 o transmitter 2 output. transmitter 2 bipolar output connected to coupling capacitor or pulse transformer through a resistor. 67 69 agnd gnd analog ground. 68 70 tv ss v ss transmit v ss . 5v ( 5%).
XR-T5793 7 rev. 2.00 dc electrical characteristics test conditions: t a = -40 c to 25 c to 85 c, all v dd s = 5v 5%, all v ss s = -5v 5%, all gnds = 0v symbol parameter min. typ. max. unit conditions dc parameters v dd s dc supply positive 4.75 5.00 5.25 v v ss s dc supply negative -4.75 -5.00 -5.25 v inputs v ih high level input 2.0 v v il low level input 0.8 v i pdc input pull down current 40 m a outputs v oh high level output 3.5 v i oh = -10 m a v oh high level output 2.4 v i oh = -40 m a v ol low level output 0.4 v i ol = 1.6ma receiver specifications r xp receiver sensitivity 0.6 4.2 vp r xcl allowed cable loss 0 10 12 db 1.024mhz (e1) (0db=2.4v) 0 10 12 db 772khz (t1) r xiwt interference margin (e1) 16 db with 6db cable loss r xti receiver slicing level (t1) 1 60 65 70 % peak voltage % r xei receiver slicing level (e1) 1 45 50 55 % peak voltage % r xlos receiver los threshold 0.2 0.3 v r in input resistance 2.5 k w up to 3.072mhz power specifications (without monitor channel) p d power dissipation 400 680 mw p d power dissipation 250 280 mw all drivers in high-z p c power consumption 75 w 2 500 833 mw all 1's transmit & receive p c power consumption 100 w 2 475 860 mw all 1's transmit & receive p c power consumption 120 w 2 450 830 mw all 1's transmit & receive pv dd power supply requirement pc/2 +5mw mw pvss power supply requirement pc/2 - 5mw mw notes 1 selected by e1/t1- 2 power consumption = power dissipation + power to the cable. bold face parameters are covered by production test and guaranteed over operating temperature range . specifications are subject to change without notice
XR-T5793 8 rev. 2.00 ac electrical characteristics test conditions: t a = -40 c to 25 c to 85 c, all v dd s = 5v 5%, all v ss s = -5v 5%, all gnds = 0v symbol parameter min. typ. max. unit conditions ac parameters v txout output pulse amplitude (75 w ) 2.13 2.37 2.60 v v txout output pulse amplitude (120 w ) 2.70 3.0 3.30 v v txout output pulse amplitude (100 w ) 2.3 3.0 3.7 v t xpw pulse width (2.048mhz) 224 244 264 ns determined by tx clock t xpw pulse width (1.544mhz) 274 324 374 ns determined by tx clock pos/neg pulse imbalance -5 +5 % t 1 txclk clock period (e1) 488 ns t 2 txclk clock period (t1) 648 ns t 3 txclk duty cycle 48 50 52 % t 4 data setup time, tdata to tclk 50 ns t 5 data hold time, tclk to tdata 50 ns t r clock rise time 30 ns t f clock fall time 30 ns t 6 receive data high (e1) 219 244 269 ns 0db cable loss t 7 data propagation delay t 1 t 2 100 ns t 8 data propagation delay t 1 t 2 100 ns specifications are subject to change without notice absolute maximum ratings storage temperature -65 c to +150 c . . . . . . . . . . . . operating temperature -40 c to +85 c . . . . . . . . . . . . supply voltage 7v . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
XR-T5793 9 rev. 2.00 txpos(n) txneg(n) txclk(n) t 4 t r t 3 t 5 t 1 or t f figure 2. transmit timing diagram t 3 t f rxin rxpos rxneg t 7 t 6 t 8 t 6 t r t r t f t f figure 3. receive timing diagram
XR-T5793 10 rev. 2.00 transmit interface 75 w 100 w 120 w min. typ. min. typ. min. typ. units 51khz to 102khz 18 22 18 22 18 22 db 102khz to 2.048mhz 18 22 18 22 18 22 db 2.048mhz to 3.072mhz 18 22 18 22 18 22 db receive interface 75 w 100 w 120 w min. typ. min. typ. min. typ. units 51khz to 102khz 20 30 20 30 20 30 db 102khz to 2.048mhz 20 30 20 30 20 30 db 2.048mhz to 3.072mhz 20 30 20 30 20 30 db note the return loss has been measured on the evaluation board coupled via a capacitor and terminated with 75 w impedance. table 1. return loss requirements (resistor tolerance: 1% on transmit side, 2% on receive side) turns ratio line impedance r load 1:1 75 w 75 w 1:1 120 w 120 w 1:1 100 w 100 w table 2. input transformer requirements turns ratio line impedance r out 1:1 75 w 68 w 1:1.265 120 w 68 w 1:1.265 100 w 62 w table 3. output transformer requirements magnetic supplier information: pulse telecom product group p.o. box 12235 san diego, ca 92112 tel. (619) 674-8100 fax. (619) 674-8262 transpower technologies, inc. 24 highway 28, suite 202 crystal bay, nv 894020187 tel. (702) 8310140 fax. (702) 8313521
XR-T5793 11 rev. 2.00 system description this device is a quad e1 transceiver which provides electrical interface for 2.048mbps applications. its unique architecture includes four receiver circuits that convert ccitt g.703 compliant bipolar signals to ttl compatible logic levels. likewise, in the other direction, four transmitters translate ttl compatible logic levels to g.703 compatible bipolar signals. this device supports two different types of loopback functions. each of four channels can be independently looped either in local or remote sides digitally. the remote loopback is performed between the receiver input and transmitter output. to activate the remote loopback on channel n, loopenn and lpmodn inputs are driven high. local loopback on channel n, can be established similarly by driving loopenn high and clearing lpmodn inputs. more than one channel can be tested simultaneously. receivers each of the four identical e1 line receivers will accept bipolar signals meeting the ccitt g.703 pulse mask requirements. each input stage consists of a slicing circuitry which samples the incoming pulses at a fixed percentage of the signals maximum amplitude. the slicing voltage level is generated using a precision peak detector. the receiver section can tolerate up to 12db of line loss (measured at 1.024mhz). a loss of signal (los) is detected on any inputs by input fail circuitry. there is an independent los pin dedicated for each of the receivers. the los detection is based on signal energy instead of number of zeros. a balanced signal (100 w or 120 w ) must be coupled by a transformer. an unbalanced signal (75 w ) may be coupled via capacitor or a transformer. transmitters this device contains four identical ccitt g.703 compliant transmitters which meet the return loss requirements. each transmitter is a single-ended voltage driver. external resistors are used to maintain an accurate source impedance that has a high return loss to the transformer or the capacitor. each of the drivers can be individually disabled, this is required in fault tolerant applications where redundancy is a requirement. during power-down mode of operation the bipolar outputs can be disabled. to protect the data integrity during a brownout, the output pulse amplitudes are reduced by a factor of 25% if the supply drops below an internally set limit. transmission is possible either with or without a clock. if a clock is used, the transmit input data must consist of full-width nrz pulses, and the transmitter output pulse width is determined by the duty cycle of the clock. if the transmit clock is tied high, the transmitter output pulses are determined by the input data pulse width. in this mode, rz data must be supplied to the device. txp txn rx tx rxp rxn rxin txout remote loopback txp txn rx tx rxp rxn rxin txout local loopback lpmod=0 lpen=1 figure 4. loopback configurations lpmod=0 lpen=1
XR-T5793 12 rev. 2.00 output transformer selection the 1:1.265 ratio output transformer is recommended for the XR-T5793 because this ratio gives the best possible transmitter output return loss for 120 w balanced e1 service. however, other transformers may provide an adequate return loss for many applications. the two characteristics that determine series build-out resistor requirements are: driver output impedance is less than 5 w . vs, which is the driver open circuit output voltage, is 4.5v peak. the following method may be used to determine transformer suitability for a given use. 1. list the application requirements. transformer ratio = 1:n v o = peak output pulse amplitude r l = load resistance figure 5. equivalent impedance schematic rs 1:n 3 4 1 2 r l v o vs 2. calculate equivalent output voltage and load resistance without the transformer. r eq r l n 2 v eq v o n figure 6. equivalent simplified schematic rs v eq vs req 3. calculate the source resistance, rs. r s req v s v eq 1 4. now calculate the theoretical return loss. return loss 20 log req r s req r s the calculation given below uses the recommended 1:1.265 ratio transformer as an example: transformer ratio = 1:1.265 v o = 3.0v peak r l = 120 w req r l n 2 120 1.6 75 w veq v o n 3.0 1.265 2.37 v rs req v s veq 1 75 4.5 2.37 1 67.4 w (datasheet specifies standard value of 68 w ) calculate the theoretical return loss to determine if the transformer is acceptable. return loss 20 log 75 67.4 75 67.4 25.5 db
XR-T5793 13 rev. 2.00 figure 7. ccitt g.703 pulse template 20% 488 ns (244 + 244) 219 ns (244 25) 0% 50% v = 100% 269 ns (244 + 25) 194 ns (244 50) nominal pulse 244 ns 10% 10% 10% 10% 10% 10% 20% 20% note: v corresponds to the nominal peak value
XR-T5793 14 rev. 2.00 68 lead plastic leaded chip carrier (plcc) rev. 1.00 1 d d 1 d d 1 d 3 d 2 a a 1 268 a 0.165 0.200 4.19 5.08 a 1 0.090 0.130 2.29 3.30 a 2 0.020 ---. 0.51 --- b 0.013 0.021 0.33 0.53 b 1 0.026 0.032 0.66 0.81 c 0.008 0.013 0.19 0.32 d 0.985 0.995 25.02 25.27 d 1 0.950 0.958 24.13 24.33 d 2 0.890 0.930 22.61 23.62 d 3 0.800 typ. 20.32 typ. e 0.050 bsc 1.27 bsc h1 0.042 0.056 1.07 1.42 h2 0.042 0.048 1.07 1.22 r 0.025 0.045 0.64 1.14 symbol min max min max inches millimeters b a 2 b 1 e seating plane d 3 note: the control dimension is the inch column 45 x h2 45 x h1 c r
XR-T5793 15 rev. 2.00 a 0.055 0.063 1.40 1.60 a 1 0.002 0.006 0.05 0.15 a 2 0.053 0.057 1.35 1.45 b 0.009 0.015 0.22 0.38 c 0.004 0.008 0.09 0.20 d 0.622 0.638 15.80 16.20 d 1 0.547 0.555 13.90 14.10 e 0.0256 bsc 0.65 bsc l 0.018 0.030 0.45 0.75 a 0 7 0 7 80 lead thin quad flat pack (14 x 14 x 1.4 mm, tqfp) rev. 3.00 symbol min max min max inches millimeters 60 41 40 21 120 61 80 d d 1 d d 1 b e a 2 a a 1 a seating plane note: the control dimension is the millimeter column l c
XR-T5793 16 rev. 2.00 notice exar corporation reserves the right to make changes to the products contained in this publication in order to im- prove design, performance or reliability. exar corporation assumes no responsibility for the use of any circuits de- scribed herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. charts and schedules contained herein are only for illustration purposes and may vary depending upon a user's specific application. while the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. products are not authorized for use in such applications unless exar corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of exar corporation is adequately protected under the circum- stances. copyright 1995 exar corporation datasheet june 1997 reproduction, in part or whole, without the prior written consent of exar corporation is prohibited.

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