View MAX3640UCMT_8922030.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

general description the max3640 is a dual-path crosspoint switch for useat oc-12 data rates. the max3640 can be used to receive and transmit 622mbps low-voltage differential signals (lvds) across a backplane with minimum jitter accumulation. each path incorporates input buffers, multiplexers, a crosspoint switch, and output drivers. the four output channels have a redundant set of out- puts for test or fanning purposes. the device offers sig- nal-path redundancy for critical data streams. the max3640 has a unique power-saving feature. when a set of four output channels has been de-select- ed, the output drivers are powered down to reduce power consumption by 165mw. the fully differential architecture ensures low crosstalk, jitter accumulation, and signal skew. the max3640 is available in a 48-pin tqfp package and operates from a +3.3v supply over the 0? to +85? temperature range. applications sonet/sdh backplaneshigh-speed parallel links digital cross-connects system interconnects atm switch cores features ? single +3.3v supply ? 257mw power consumption (four outputchannels enabled) ? 2.8ps rms output random jitter ? 42ps output deterministic jitter ? power-down feature for deselected outputs ? 110ps channel-to-channel skew ? 240ps output edge speed ? lvds inputs/outputs ? lvds output 3-state enable max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch ________________________________________________________________ maxim integrated products 1 parallel dataoutput optical transceiver 622mbps sonet source a sonet source b 622mbps 2.5gbps max3869 laser driver max3866 tia and la max3876 cdr max3831 4-channel interconnect mux/demux max3640 crosspoint switch typical operating circuit 19-4800; rev 0; 3/00 for free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.for small orders, phone 1-800-835-8769. ordering information pin configuration appears at end of data sheet. temp. range part pin-package 48 tqfp 0? to +85? max3640ucm downloaded from: http:///
max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics(v cc = +3.0v to 3.6v, lvds differential load = 100 ?%, t a = 0? to +85?. typical values are at v cc = +3.3v, t a = +25?, unless otherwise noted.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. supply voltage, v cc ................................................-0.5v to 5.0v input voltage (lvds, ttl)..........................-0.5v to (v cc + 0.5v) output voltage (lvds) ...............................-0.5v to (v cc + 0.5v) continuous power dissipation (t a = +85?) 48-pin tqfp (derate 12.5mw/?) .................................813mw operating temperature range...............................0? to +85? storage temperature range ............................ -55? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units eight outputs enabled 130 175 supply current i cc four outputs enabled 78 ma lvds inputs and outputs input voltage range v in 0 2400 mv differential input threshold v idth -100 100 mv threshold hysteresis v hyst 90 mv differential input impedance r in 85 100 115 input common-mode current i os lvds input, v os = 1.2v 245 a output voltage high v oh figure 1 1.475 v output voltage low v ol figure 1 0.925 v output voltage swing |v od | figure 1 250 400 mv change in magnitude ofdifferential output for complementary states | ? v od | 25 mv offset output voltage v os figure 1 1.125 1.275 mv change in magnitude ofoutput offset voltage for complementary states | ? v os | 25 mv ena, enb = gnd 1 m differential output impedance ena, enb = v cc 80 120 output current shorted together 12 ma ttl inputs input voltage high v ih 2.0 v input voltage low v il 0.8 v input current high i ih v ih = 2.0v -250 a input current low i il v il = 0.8v -550 a downloaded from: http:///
max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch _______________________________________________________________________________________ 3 ac electrical characteristics(v cc = +3.0v to 3.6v, lvds differential load = 100 ?%, t a = 0 c to +85 c. typical values are at v cc = +3.3v, t a = +25 c, unless otherwise noted.) (note 1) note 1: ac characteristics are guaranteed by design and characterization. note 2: deterministic jitter (dj) is the arithmetic sum of pattern-dependent jitter and pulse-width distortion. dj is measured whileapplying 100mvp-p noise (f 2mhz) to the power supply. parameter symbol conditions min typ max units parallel input/output data rate 622 mbps output rise/fall time t r , t f 20% to 80% 150 240 350 ps output random jitter rj 2.8 4 ps rms output deterministic jitter dj (note 2) 42 200 ps lvds output differential skew t skew1 24 50 ps lvds output channel-to-channel skew t skew2 110 ps lvds output enable time 266 ns lvds output disable time 66 ns lvds propagation delay frominput to output t d 2.5 ns figure 1. lvds output levels lvds+single ended 125mv min 200mv max 125mv min 200mv max 250mv min 400mv max 500mv min800mv max 250mv min400mv max 250mv min400mv max lvds-single ended (lvds+) - (lvds-) differential output voltage v os = 1.2v ?5mv v os = 1.2v ?5mv 0 ? v od ? v oh v ol v oh v ol downloaded from: http:///
max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch 4 _______________________________________________________________________________________ 50 7060 9080 110100 120 140130 150 0 203040 10 50 60 70 80 supply current vs. temperature max3640 toc01 temperature (?) supply current (ma) 8 outputs enabled 4 outputs enabled 560 570 580 590 600 610 620 630 640 0 2 04 06 08 0 differential output voltage vs. temperature max3640 toc02 temperature (?) differential output voltage (mvp-p) 100mv/div input = 2 13 - 1 prbs contains 100 zeros 622mbps eye diagram max3640 toc03 200ps/div 100mv/div 1.25gbps eye diagram max3640 toc04 100ps/div input = 2 13 - 1 prbs contains 100 zeros typical operating characteristics (v cc = +3.3v, t a = +25 c, unless otherwise noted.) downloaded from: http:///
max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch _______________________________________________________________________________________ 5 pin description pin name function 1, 12, 25, 36, 41 v cc positive supply voltage 2, 11, 26, 35 gnd supply ground 3, 5, 45, 47 dia3+, dia4+, dia1+, dia2+ positive lvds, channel-a data input 4, 6, 46, 48 dia3-, dia4-, dia1-, dia2- negative lvds, channel-a data input 7, 9, 13, 15 dib1+, dib2+, dib3+, dib4+ positive lvds, channel-b data input 8, 10, 14, 16 dib1-, dib2-, dib3-, dib4- negative lvds, channel-b data input 17 20 sel1 sel4 crosspoint switch select, ttl input. (table 1) 21, 23, 27, 29 dob4-, dob3-, dob2-, dob1- negative lvds, channel-b data output 22, 24, 28, 30 dob4+, dob3+, dob2+, dob1+ positive lvds, channel-b data output 31, 33, 37, 39 doa4-, doa3-, doa2-, doa1- negative lvds, channel-a data output 32, 34, 38, 40 doa4+, doa3+, doa2+, doa1+ positive lvds, channel-a data output 42 enb channel-b output enable, ttl input. enb = high enables dob1 ? dob4. enb = low powers down dob1 ? dob4 and sets them to a high-impedance state. 43 ena channel-a output enable, ttl input. ena = high enables doa1 ? doa4. ena = low powers down doa1 ? doa4 and sets them to a high-impedance state. 44 in_sel input select pin, ttl input. connect to logic high (or v cc ) to select dia1 ? dia4. connect to logic low (or gnd) to select dib1 ? dib4. detailed description figure 2 shows the max3640 s architecture. it consists of two data paths; each data path begins with four dif-ferential input buffers. the in_sel pin selects whether the a or b channels are passed to the 2x2 crosspoint switch that follows. the sel_ pins control the routing of the crosspoint switch. each crosspoint switch output drives a pair of lvds output drivers. this provides a redundant set of outputs that can be used for fan-out or test purposes. each set of outputs, doa_ and dob_, is enabled or disabled by the ena and enb pins. see table 1 for routing controls. lvds inputs and outputs the max3640 features lvds inputs and outputs forinterfacing with high-speed digital circuitry. the lvds standard is based on the ieee 1596.3 lvds specifica- tion. this technology uses 500mv to 800mv differential low-voltage swings to achieve fast transition times, low power dissipation, and improved noise immunity. for proper operation, the data outputs require 100 dif- ferential termination between the inverting and nonin-verting pins. do not terminate these outputs to ground. see figure 1 for lvds output voltage specifications. the data inputs are internally terminated with 100 dif- ferential and therefore do not require external termina-tion. downloaded from: http:///
max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch 6 _______________________________________________________________________________________ dia1+dia1- dib1+ dib1- doa1+doa1- dob1+ dob1- sel1 doa2+ doa2- dob2+ dob2- sel2 doa3+ doa3- dob3+ dob3- sel3 doa4+ doa4- dob4+ dob4- sel4 dia2+dia2- dib2+ dib2- dia3+ dia3- dib3+ dib3- dia4+ dia4- dib4+ dib4- in_sel ena enb 2x2 crosspointswitch 10 1 0 1 0 1 1 0 0 1 0 1 0 1 0 2x2 crosspointswitch max3640 figure 2. functional diagram downloaded from: http:///
max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch _______________________________________________________________________________________ 7 routing controls output signals in_sel sel1 sel2 signal at doa1/dob1 signal at doa2/dob2 0 0 0 dib1 dib1 0 0 1 dib1 dib2 0 1 0 dib2 dib1 0 1 1 dib2 dib2 1 0 0 dia1 dia1 1 0 1 dia1 dia2 1 1 0 dia2 dia1 1 1 1 dia2 dia2 in_sel sel3 sel4 signal at doa3/dob3 signal at doa4/dob4 0 0 0 dib3 dib3 0 0 1 dib3 dib4 0 1 0 dib4 dib3 0 1 1 dib4 dib4 1 0 0 dia3 dia3 1 0 1 dia3 dia4 1 1 0 dia4 dia3 1 1 1 dia4 dia4 table 1. output routing figure 3. lvpecl to lvds interface max3640 +3.3v+3.3v 182 48 48 48 48 182 lvpecldriver z o = 50 z o = 50 note: disabling the outputs by using ena or enb will drive the doa_ or dob_ data outputs to a high-impedance state. downloaded from: http:///
max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch 8 _______________________________________________________________________________________ figure 4. lvds input model max3640 dia1+ 50 50 1.5k 1.5k dia1- v cc v cc 5k 25k v cc applications information interfacing lvpecl outputs to max3640 lvds inputs to dc-couple between lvpecl and lvds, use theresistor network shown in figure 3. note that the lvpecl output is optimized for a 50 load to v cc - 2v, so an equivalent network is used. also, the networkattenuation should be such that the lvpecl output sig- nal after attenuation is well within the lvds input range. note that the lvds input impedance is a true 100 between the inputs. the differential impedance doesnot contribute to the dc termination impedance, but does contribute to the ac termination impedance. this means that ac and dc impedance will always be dif- ferent. layout techniques for best performance, use good high-frequency layouttechniques. filter voltage supplies, and keep ground connections short. use multiple vias where possible. also, use controlled-impedance transmission lines to interface with the max3640 data inputs and outputs. interface models figure 4 shows the interface model for the lvdsinputs, while figure 5 shows the model for the lvds outputs. downloaded from: http:///
max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch _______________________________________________________________________________________ 9 figure 5. lvds output model max3640 doa1+ v cc v cc v cc 45 45 doa1- 12 3 4 5 6 7 8 9 1011 12 1314 15 16 17 18 19 20 21 22 23 24 4847 46 45 44 43 42 41 40 39 38 37 3635 34 33 32 31 30 29 28 27 26 25 max3640 v cc gnd dia3+ dia3- dia4+ dia4- dib1+ dib1- dib2+ dib2- gnd v cc doa2- doa2+ doa1- doa1+ v cc enb ena in_sel dia1+ dia1- dia2+ dia2- v cc gnd doa3+ doa3- doa4+ doa4- dob1+ dob1- dob2+ dob2- gnd v cc dob3+ dob3- dob4+ dob4- sel4 sel3 sel2 sel1 dib4- dib4+ dib3- dib3+ pin configuration chip information transistor count: 2453 downloaded from: http:///
max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch 10 ______________________________________________________________________________________ package information 32l / 48l , t q fp.eps downloaded from: http:///
max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch ______________________________________________________________________________________ 11 notes downloaded from: http:///
max3640 3.3v, 622mbps lvds, dual 4:2 crosspoint switch maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2000 maxim integrated products printed usa is a registered trademark of maxim integrated products. notes downloaded from: http:///

▲Up To Search▲

Price & Availability of MAX3640UCMT

	To Download MAX3640UCMT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .