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xr-t3588/89 ...the analog plus company tm v.35 interface receiver/transmitter rev. 1.05 1997 exar corporation, 48720 kato road, fremont, ca 94538 (510) 668-7000 fax (510) 668-7017 1 june 1997-3 features compatible with itu-t v.35 and bell 306 interface requirements ttl input compatibility high common mode output voltage range excellent stability over supply and temperature range high speed operation (up to 10mbps) individual receive/transmit power down capability applications high speed data transmission systems short haul modems signal converters and adapters network and diagnostic systems matrix switches modem emulators general description this v.35 chip set consists of two bipolar chips, one performing a receive function, the other a transmit function according to the specification requirements laid down in appendix 11 of the v.35 itu-t recommendation and bell 306 modem interface specification. typical applications require three transmit and receive pairs to establish the link between distant dte's at data rates ranging from 48kbps to 10mbps. to conserve power (especially in the transmitter, which requires approximately 22ma or each output stage to meet itu-t specifications), power-down functions are included in both devices, allowing any of the three receive/transmit circuits to be disabled. all inputs and outputs are ttl compatible and designed to offer maximum versatility and performance. both the transmitter and receiver require termination resistors external to each device, to meet the v.35 specification tolerance. ordering information part no. package operating temperature range xr-t3588cn 18 lead 300 mil cdip 0 c to 70 c xr-t3588cp 18 lead 300 mil pdip 0 c to 70 c xr-t3589cn 14 lead 300 mil cdip 0 c to 70 c
xr-t3588/89 2 rev. 1.05 block diagram i/p 3 ttl input sela selb figure 1. xr-t3588 block diagram bias 8 2 3 selector bias v ee 1 2 3 6 inp v ee inp inp v ee 4 5 i/p 2 ttl input i/p 1 ttl input 1 7 9 gnd v cc v ee vref 1 o/p 1b o/p 1a 16 17 18 13 15 14 vref 2 o/p 2b o/b 2a 10 12 11 vref 3 o/p 3b o/b 3a
xr-t3588/89 3 rev. 1.05 1 14 7 gnd v cc v ee + + + o/p 1 o/p 2 o/p 3 1 2 3 12 13 10 11 8 9 2 3 sela selb i/p 1b 1/p 1a i/p 2b 1/p 2a i/p 3b 1/p 13 selector 4 5 6 figure 2. xr-t3588 block diagram
xr-t3588/89 4 rev. 1.05 pin configuration 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 o/p1a o/p1b v ref1 o/p2b o/p2a v ref2 o/p3b o/p3a gnd sela selb i/p1 i/p2 i/p3 v cc bias v ref3 v ee 18 lead pdip, cdip (0.300o) XRT3588 1 2 3 4 5 6 7 14 13 12 11 10 9 8 14 lead cdip (0.300o) xrt3589 v cc i/p1a i/p1b 1/p2a 1/p2b i/p3a i/p3b gnd sela selb o/p1 o/p2 o/p3 v ee pin description for xr-t3588 pin # symbol type description 1 gnd ground (0v). 2 sela i channel enable select a input. ttl compatible input used in conjunction with selb to power down individual receiver channels. (see table 2). 3 selb i channel enable select b input. ttl compatible input used in conjunction with sela to power down individual receiver channels (see table 2). 4 i/p1 i channel 1 input. ttl compatible. 5 i/p2 i channel 2 input. ttl compatible. 6 i/p3 i channel 3 input. ttl compatible. 7 v cc positive supply (5v). 8 bias i bias current input. dc level 1.1v nominal. connect external resistor from pin to ground to define transmitter output current levels (r bias 3.9k for iout=22ma). 9 v ee negative supply (-5v). 10 v ref3 o channel 3 voltage regulator . provides 3.3v regulated supply for connection of channel 3 transmit termination network (see figure 6 ). if the driver is disabled, the voltage output at this pin will be vcc - 0.7v. 11 o/p3a o channel 3 differential output a. open collector current output. current sink capability 22ma nominal (defined by rbias). when terminated with network to vref3 provides an output voltage with inverse phase to i/p3. dc level with tx and rx termination +/-o.275v nominal. 12 o/p3b o channel 3 differential output b . open collector current output. current sink capability 22ma nominal (defined by rbias). when terminated with network to vref3 provides an out- put voltage in phase with i/p3. dc level with tx and rx termination +/-o.275v nominal. 13 v ref2 o channel 2 voltage regulator. provides 3.3v regulated supply for connection of channel 2 transmit termination network (see figure 6 ). if the driver is disabled, the voltage output at this pin will be vcc - 0.7v. 14 o/p2a o channel 2 differential output a. open collector current output. current sink capability 22ma nominal (defined by rbias). when terminated with network to vref2 provides an output voltage with inverse phase to i/p2. dc level with tx and rx termination +/-o.275v nominal. 15 o/p2b o channel 2 differential output b. open collector current output. current sink capability 22ma nominal (defined by rbias). when terminated with network to vref2 provides an out- put voltage in phase with i/p2. dc level with tx and rx termination +/-o.275v nominal.
xr-t3588/89 5 rev. 1.05 pin description for xr-t3588 (cont'd) pin # symbol type description 16 v ref1 o channel 1 voltage regulator. provides 3.3v regulated supply for connection of channel 1 transmit termination network (see figure 6 ). if the driver is disabled, the voltage output at this pin will be vcc - 0.7v. 17 o/pl b o channel i differential output b. open collector current output. current sink capability 22ma nominal (defined by rbias). when terminated with network to vref1 provides an output volt- age in phase with i/p2. dc level with tx and rx termination +/-o.275v nominal. 18 o/pl a o channel 1 differential output a. open collector current output. current sink capability 22ma nominal (defined by rbias). when terminated with network to vref2 provides an output voltage with inverse phase to i/pl. dc level with tx and rx termination +/-o.275v nominal. pin description for xr-t3589 pin # symbol type description 1 gnd ground (0v). 2 sela i channel enable select a input. ttl compatible input used in conjunction with selb to power down individual receiver channels. (see table 2). 3 selb i channel enable select b input. ttl compatible input used in conjunction with sela to power down individual receiver channels (see table 2). 4 o/p1 o channel 1 output. ttl compatible. 5 o/p2 o channel 2 output. ttl compatible. 6 o/p3 o channel 3 output. ttl compatible. 7 v ee negative supply (-5v). 8 i/p3b i channel 3 differential input b. rin 4kl2 nominal. should be terminated with an external network to gnd (see figure 8 ). 9 i/p3a i channel 3 differential input a. rin 4k.q nominal. should be terminated with an external network to gnd (see figure 8 ). 10 vp2b i channel 2 differential input b. rin 4kl2 nominal. should be terminated with an external network to gnd (see figure 8 ). 11 i/p2a i channel 2 differential input a. rin 4kq nominal. should be terminated with an external network to gnd (see figure 8 ). 12 i/pl b i channel i differential input b. rin 4k.q nominal. should be terminated with an external network to gnd (see figure 8 ). 13 i/pla i channel i differential input a. rin 4k.q nominal. should be terminated with an external network to gnd (see figure 8 ). 14 v cc positive supply (5v).
xr-t3588/89 6 rev. 1.05 xr-t3588 electrical characteristics test conditions: v cc = 5v 5%, v ee = -5v 5%, t a = 0 c to 70 c symbol parameter min. typ. max. unit conditions dc electrical characteristics v cc positive supply voltage 4.75 5 5.25 v v ee negative supply voltage -4.75 -5 -5.25 v i cc input current 86 124 ma 1 i ee input current -132 -92 ma 1 l pcc power down i cc 0.2 10.2 ma 2 i pee power down l ee -1.0 -14.0 ma 2 v dih high level input voltage 2 v cc v data inputs i dil low level input voltage 0 0.8 v data inputs i dih input current high 1.0 a data inputs i dil input current low -2.1 ma data inputs v sih selector high level voltage 2 v cc v v sil selector low level voltage 0 0.6 v i sil selector input current low -0.6 ma i sih selector input current high 50 a v ol output low voltage -0.91 v 3 v oh output high voltage 0.85 v 3 zs source impedance 90 100 110 w per ccitt v.35 4,5,6 rgnd resistance to ground 135 150 165 w per ccitt v.35 4,5,6 iodiff output current differential 20.2 22.0 23.8 ma with 3.9k bias resistor v ref transmitter reference voltage 3.0 3.3 3.6 v voltage output ac electrical characteristics 6 (see figure 3 ) t plht input to output 25 50 ns t phlt input to output 25 50 ns t rt tx rise time 10 20 ns t ft tx fall time 10 20 ns notes 1 with extemal transmit network (figure 6) connected to each transmitter output and select a, select b both high. 2 all transmitter outputs open-circuit and select a, select b both low. 3 with extemal transmit network terminated with 100 w (figure 7). 4 differential impedance between o/p a and o/p b. extemal transmit network (figure 6) connected to transmitter output. 5 o/p a's and o/p bs connected together, resistance measured to ground, extemal transmit network ((figure 6) present. 6 o/p terminated with extemal transmit network terminated with 100 w (see figure 7). specifications are subject to change without notice
xr-t3588/89 7 rev. 1.05 xr-t3589 electrical characteristics test conditions: v cc = 5v 5%, v ee = -5v 5%, t a = 0 c to 70 c symbol parameter min. typ. max. unit conditions dc electrical characteristics vcc supply voltage 4.75 5 5.25 v v ee supply voltage -5.25 -5 -4.75 v i cc input current 40 60 ma select a, select b, both high i ee input current 7 9 ma select a, select b, both high i oh output high level current -1.6 a v oh 2.4v i ol output low level current 40 ma v ol < 0.4v v oh high level output 2.4 v at i oh < 40 a v ol low level output 0.4 v at i ol < 1.6ma v in input sensitivity 400 mv differential 2 z ino input impedance 8 k w differential 2 z int input impedance 90 100 110 w per itu-t v.35 1, 2 r gnd resistance to gnd 135 150 165 w per itu-t v.35 1, 2 v sih select high level voltage 2 v cc v v sil select low level voltage 0.8 v l pcc power down i cc current 1.1 ma select a, select b, both low i pee power down i ee current -0.3 ma ac electrical characteristics (see figure 4 ) t plhr input to output 50 70 ns t phlr input to output 50 70 ns t rr rx rise time 18 40 ns t fr rx fall time 12 30 ns notes 1 i/p terminated to circuit 102 (see figure 8.) 2 pins 8-9, 10-11, 12-13. specifications are subject to change without notice absolute maximum ratings supply voltages 7v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature -65 c to + 150 c . . . . . . . . . . . . power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xr-t3588cn 1000mw . . . . . . . . . . . . . . . . . . . xr-t3589cn 300mw . . . . . . . . . . . . . . . . . . . .
xr-t3588/89 8 rev. 1.05 figure 3. transmitter waveforms i/p o/pb o/pa t plht t phlt t ft t rt 90% 10% figure 4. receiver waveforms i/p b o/p t plhr t phlr t fr t rr 90% 10% i/p a system description XRT3588 the function of the transmitter is to take a ttl input signal at a maximum bit rate of 1ombps and output a balanced differential signal with a peak amplitude of 0.55v and a maximum dc offset of 0.6v. an internal buffer provides the regulated output voltage to set the mean level of the transmitters to less than 0.6v. figure 5 shows a simplified circuit for the output stage. to meet the pulse shape and offset requirements laid down in the v.35 specification, the transmitter employs an internal temperature compensated voltage generator to provide reference voltages for both offset control and output current generation. load resistors for the output stage, which provide the required source impedance for the transmitter, are external to the ic and are required to meet the v.35 specified tolerance. xrt3589 the xr-t3589 line receiver contains three identical receive circuits to complement the xr-t3588 line transmitter. received differential signals are converted into a single ttl compatible output. the input stage is designed to meet the full v.35 noise and common mode input specification. individual receivers may be shut down to achieve power savings for applications not requiring three channels. two ttl compatible inputs provide four combinations of transmitter configurations, as defined in table 2. if either of the select pins is left open a high state is adopted, hence with no inputs applied, all channels are powered up. however it is recommended to tie all select inputs to either gnd or v cc .
xr-t3588/89 9 rev. 1.05 transmitter sel a sel b 1-2-3 on high high 1-2 on high low 1 on low high all off low low table 1. transmitter selectors transmitter sel a sel b 1-2-3 on high high 1-2 on high low 1 on low high all off low low table 2. receiver selectors typical applications figure 9 shows a schematic for a typical application of the xr-t3588/t3589. in this application the termination resistor network is fed from the chip on-board regulator. the regulator provides a voltage of 3.3v. the major issue is the power dissipation of the xr-t3588. following is a discussion of the power that is dissipated by the xr-t3588 when all three drivers are active simultaneously. the power used by the xr-t3588 is given by; pd = (v cc - i cc + v ee - i ee ) - 3 - (rterm - (iterm) 2 ) where: v cc , i cc , v ee and i ee are the positive and negative supply voltages and currents, whose values may be found in the typical column of the dc characteristics, rterm is the equivalent impedance of the termination network, lterm is the current flow through the termination network. in the case of the three drivers enabled and terminated, the typical power dissipation is; pd = (5 - 0.086 + (5 - 0.092)) - 3 - (150 - (0.022) 2 ) = 672.2mw the junction temperature of the part is given by; tjunction= tambient + ( ja - pd) where: t junction is junction temperature, tambient is ambient temperature, ja is package thermal impedance. for reliable operation, the absolute maximum junction temperature must be maintained below 150 c. with a ja for the ceramic package of 80 c/w, and a maximum ambient temperature of 70 c the junction temperature is; tjunction = 70 + 80 - 0.672 = 1 34 c if the device is used in an enclosure without forced cooling where the ambient temperature could approach or exceed 70 c, the power dissipation of the part should be reduced for improved reliability. figure 10 shows an implementation using an external reference voltage made with two resistors of values 180 w and 360 w . this implementation offers the advantage of eliminating the feeding current to the termination network from the on chip reference, thereby reducing the dissipation in the xr-t3588. the formula to calculate the on chip power dissipation is now; pd = (v cc - i gg + v ee - i ee ) - 3 - ((v cc - 3.3) - l term + r term - (i term ) 2 ) where the term a3 - (v cc - 3.3) - (iterm)o is the power previously dissipated in the xr-t3588 internal voltage regulator. the revised value of power dissipation is; pd = (5 - 0.086) + (5 - 0.092) - 3 - ((5 - 3.3) - 0.022 + 150 - (0.022) 2 ) = 560mw the total on chip power saving is; 3 - (5 - 3.3) - 0.022, i.e. 112.2 mw. figure 11 shows the demo board schematic. to obtain a demo board, call your local representative.
xr-t3588/89 10 rev. 1.05 v ref o/p a o/b b 125 50 50 i/p a i/p b 50 50 125 v ref o/p a o/p b 125 50 50 100 v ref 1 (3.3v nominal) pin 16 125 50 50 pin 18 o/p 1a pin 17 o/p 1b 22ma bias pin 8 v ee 3.9k sets current source value figure 5. xr-t3588 output stage simplified circuit figure 6. external transmit network figure 7. xr-t3588 output stage simplified circuit figure 8. external receive network
xr-t3588/89 11 rev. 1.05
xr-t3588/89 12 rev. 1.05
xr-t3588/89 13 rev. 1.05 a 0.100 0.200 2.54 5.08 a 1 0.015 0.070 0.38 1.78 b 0.014 0.026 0.36 0.66 b 1 0.045 0.065 1.14 1.65 c 0.008 0.018 0.20 0.46 d 0.860 0.960 21.84 24.38 e 1 0.250 0.310 6.35 7.87 e 0.300 bsc 7.62 bsc e 0.100 bsc 2.54 bsc l 0.125 0.200 3.18 5.08 a 0 15 0 15 d b e b 1 18 lead ceramic dual-in-line (300 mil cdip) rev. 1.00 symbol min max min max inches millimeters 18 19 10 a c e 1 l a 1 seating plane base plane a e note: the control dimension is the inch column
xr-t3588/89 14 rev. 1.05 18 lead plastic dual-in-line (300 mil pdip) rev. 1.00 18 1 10 9 d eb 1 a 1 e 1 c e a 2 l b seating plane symbol min max min max inches a 0.145 0.210 3.68 5.33 a 1 0.015 0.070 0.38 1.78 a2 0.115 0.195 2.92 4.95 b 0.014 0.024 0.36 0.56 b 1 0.030 0.070 0.76 1.78 c 0.008 0.014 0.20 0.38 d 0.845 0.925 21.46 23.50 e 0.300 0.325 7.62 8.26 e 1 0.240 0.280 6.10 7.11 e 0.100 bsc 2.54 bsc e a 0.300 bsc 7.62 bsc e b 0.310 0.430 7.87 10.92 l 0.115 0.160 2.92 4.06 a 0 15 0 15 millimeters a a note: the control dimension is the inch column e b e a
xr-t3588/89 15 rev. 1.05 a 0.100 0.200 2.54 5.08 a 1 0.015 0.060 0.38 1.52 b 0.014 0.026 0.36 0.66 b 1 0.045 0.065 1.14 1.65 c 0.008 0.018 0.20 0.46 d 0.685 0.785 17.40 19.94 e 1 0.250 0.310 6.35 7.87 e 0.300 bsc 7.62 bsc e 0.100 bsc 2.54 bsc l 0.125 0.200 3.18 5.08 a 0 15 0 15 l d b e b 1 14 lead ceramic dual-in-line (300 mil cdip) rev. 1.00 symbol min max min max inches millimeters a 1 a c seating plane base plane a 14 17 8 e 1 e note: the control dimension is the inch column
xr-t3588/89 16 rev. 1.05 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 here in 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 1997 exar corporation datasheet june 1997 reproduction, in part or whole, without the prior written consent of exar corporation is prohibited.

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