for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. general description the max3750/max3751 are +3.3v, fibre channel port bypass ics that include a high-speed multiplexer and output buffer stage for hot swapping a storage device. these devices are optimized for use in a fibre channel arbitrated loop topology. the max3750 has a 2.125gbps data rate, while the max3751? data rate is 1.0625gbps. total power con- sumption (including output currents) is low: just 190mw for the max3750 and 180mw for the max3751. low 10ps jitter makes these devices ideal for cascaded topologies. the output driver circuitry is tolerant of load mismatches commonly caused by board vias and inductive connectors. on-chip termination reduces external part count and simplifies board layout. applications 2.125gbps fibre channel arbitrated loop 1.0625gbps fibre channel arbitrated loop mass storage systems raid/jbod applications features ? single +3.3v supply ? low jitter: 10ps ? low power consumption 190mw (max3750) 180mw (max3751) ? large output signal swing: >1000mvp-p ? mismatch tolerant output driver stage ? 150 ? differential on-chip termination on all inputs ? 150 ? on-chip back termination on all output ports max3750/max3751 +3.3v, 2.125gbps/1.0625gbps fibre channel port bypass ics ________________________________________________________________ maxim integrated products 1 19-4792; rev 2; 5/04 part max3750 cee MAX3750CEE ? 0? to +70? 0? to +70? temp range pin-package 16 qsop 16 qsop evaluation kit available pin configuration appears at end of data sheet. ordering information c1?8 = 100nf three max3750/max3751s cascaded in an fc-al application c7 c8 c2 c1 max3750 max3751 max3750 max3751 max3750 max3751 fc-al disk drive rx tx fc-al disk drive rx tx lin+ lin- lout+ lout- v cc 3.3v sel gnd out+ out- in+ in- c3 c4 lin+ lin- lout+ lout- v cc 3.3v sel gnd out+ out- in+ in- lin+ lin- lout+ lout- v cc 3.3v sel gnd out+ out- in+ in- c5 c6 microprocessor fc-al disk drive rx tx max3750 max3750 max3750 t ypical application circuit max3751 cee 0? to +70? 16 qsop ? denotes lead-free package.
max3750/max3751 +3.3v, 2.125gbps/1.0625gbps fibre channel port bypass ics 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (v cc = +3.0v to +3.6v, t a = 0? to +70?, unless otherwise noted. typical values are at v cc = +3.3v and t a = +25?.) note 1: output currents included. supply voltage, v cc ..............................................-0.5v to +5.0v voltage at lout+, lout-, out+, out- ..............................(v cc - 1.65v) to (v cc + 0.5v) current out of lout+, lout-, out+, out- ...................?2ma voltage at sel, lin+, lin-, in+, in- ..........-0.5v to (v cc + 0.5v) differential voltage at (lin+ - lin-), (in+ - in-).....................?v continuous power dissipation (t a = +70?) 16 qsop (derate 8.3mw/? above +70?) .................667mw operating temperature range ...........................-40? to +85? storage temperature range ...............................-55? to 150? lead soldering temperature (soldering, 10s).................+300? total differential signal, peak-to-peak max3750 (note 1) 150 ? load, total differential signal, peak-to-peak conditions ? 132 150 172 differential input impedance mv 200 2200 ma 57 84 supply current data input voltage swing mv 1000 1600 output voltage at lout and out ? -10 10 ttl input current v -0.3 0.8 ttl input low v 2v cc + 0.3 ttl input high units min typ max parameter max3751 (note 1) 54 78 max3751 1.0625 total differential signal, peak-to-peak max3750 max3750 conditions mv 200 2200 data input voltage swing gbps 2.125 data rate output edge speed in out? in lout ps 160 units min typ max parameter ac electrical characteristics (v cc = +3.0v to +3.6v, t a = 0? to +70?, unless otherwise noted. typical values are at v cc = +3.3v and t a = +25?.) deterministic jitter in out? in lout? lin out max3750, peak-to-peak (notes 2, 4) 10 ps max3751, peak-to-peak (notes 3, 4) 10 max3750, rms (note 2) 1.6 ps prop delay in out? in lout? lin out max3751 442 random jitter in out? in lout? lin out max3751, rms (note 3) 1.6 max3751 325 note 2: input t r and t f < 150ps, 20% to 80%. note 3: input t r and t f < 300ps, 20% to 80%. note 4: deterministic jitter is measured with 20 bits of the k28.5 pattern (00111110101100000101). max3750 300 ps
max3750/max3751 +3.3v, 2.125gbps/1.0625gbps fibre channel port bypass ics _______________________________________________________________________________________ 3 50 52 51 55 54 53 58 57 56 59 -40 0 20 -20 40 6 080 100 supply current vs. temperature max3750/51 toc01 temperature (?) supply current (ma) max3750 max3751 t ypical operating characteristics (v cc = 3.3v, t a = +25?, unless otherwise noted.) name function 1, 4, 5, 8, 16 gnd electrical ground 2 lout+ noninverted port data output pin 3 lout- inverted port data output 6 out+ noninverted data output 11 lin+ noninverted port data input 10 lin- inverted port data input 9 sel select input: sel = low: in out sel = high: lin out 7 out- inverted data output 15 in+ noninverted data input 14 in- inverted data input 12, 13 v cc positive supply voltage pin description
max3750/max3751 +3.3v, 2.125gbps/1.0625gbps fibre channel port bypass ics 4 _______________________________________________________________________________________ _________________circuit description a simplified block diagram of the single port bypass is shown in figure 1. in+ and in- drive an input buffer (inbuff) with 150 ? of internal differential input termi- nation. inbuff drives an output buffer (lobuff) and an input to a multiplexer (mux). a low ttl input at sel selects the signal path of inbuff through mux to the output buffer (outbuff). when sel has a high ttl logic level present the signal path is into libuff, through mux, to outbuff. low-frequency cutoff the low-frequency cutoff is determined by the input resistance and the coupling capacitor as illustrated by the following equation: f c = 1 / (2 rc) in a typical system where r = 150 ? and c = 100nf, resulting in f c = 10khz. layout techniques the max3750/max3751 are high-frequency products. the performance of the circuit is largely dependent upon layout of the circuit board. use a multilayer circuit board with dedicated ground and v cc planes. power supplies should be capacitively bypassed to the ground plane with surface-mount capacitors placed near the power-supply pins. sel note: see internal input/output schematics for detailed terminations (figures 2?). inbuff lobuff libuff in+ in- mux d0 q sel ttlin d1 outbuff out+ out- v cc gnd lout+ lout- lin+ lin- max3750 max3751 figure 1. max3750/max3751 block diagram
max3750/max3751 +3.3v, 2.125gbps/1.0625gbps fibre channel port bypass ics _______________________________________________________________________________________ 5 75 ? 75 ? (l)out+ esd structures (l)out- v cc gnd v cc gnd sel esd structure v cc gnd 75 ? 75 ? (l)in+ esd structure (l)in- figure 2. lout/out pins internal input/output schematic figure 4. lin/in pins internal input/output schematic figure 3. sel pin internal input/output schematic figure 5. 50 ? termination applications 300 ? 300 ? out+ out- max3750 max3751 in+ in- 176 ? 176 ? 43 ? 43 ? 43 ? 43 ? out+ out- max3750 max3751 in+ in-
max3750/max3751 +3.3v, 2.125gbps/1.0625gbps fibre channel port bypass ics maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 6 _____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. qsop.eps 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 gnd gnd in+ in- v cc v cc lin+ lin- sel top view max3750 max3751 lout+ lout- out+ gnd gnd out- gnd qsop pin configuration package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)
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