1 ps8788b 01/23/06 features ? 4 differential channel, 2:1 mux/demux ? pci express signal compliance ? low bit-to-bit skew , 10ps max (between '+' and '-' bits) ? low crosstalk: -65db@10 mhz ? low off isolation: -65db@10 mhz ? v cc operating range: +1.5v to +2.0v ? esd tolerance: 8kv hbm i/o; 2kv hbm select pin ? low channel-to-channel skew, 35ps max ? packaging (pb-free & green): C 42-contact, tqfn (zh42) description pericom semiconductors pi2pcie412-d is an 8 to 4 differential channel multiplexer/demultiplexer switch. this solution can switch 2 full pci express lanes to one of two locations. using a unique design technique, pericom has been able to minimize the impedance of the switch such that the attenuation observed through the switch is negligible. the unique design technique also offers a layout targeted for pci express signals, which minimizes the channel to channel skew as well as channel to channel crosstalk as required by the pci express specifcation. application switch a pci-express lane output between two pci express lane inputs. block diagram pin description pi2pcie412-d enhanced, 1.8v, pci express compliant, 4-differential channel, 2:1 mux/demux switch, w/ single enable sel a 7 a 6 a 5 a 4 a 3 a 2 a 1 a 0 1 b 1 0 b 1 3 b 1 2 b 1 1 b 2 0 b 2 3 b 2 2 b 2 5 b 1 4 b 1 7 b 1 6 b 1 5 b 2 4 b 2 7 b 2 6 b 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 42 41 40 39 18 19 20 21 0 b 1 1 b 1 2 b 1 3 b 1 0 b 2 1 b 2 2 b 2 3 b 2 v dd 4 b 1 5 b 1 6 b 1 7 b 1 4 b 2 5 b 2 6 b 2 7 b 2 gnd a 0 a 1 gnd v dd a 2 a 3 v dd sel gnd a 4 a 5 v dd gnd a 6 a 7 gnd v dd gnd v dd gnd v dd gnd v dd gnd gnd truth table function sel a n to n b 1 l a n to n b 2 h
2 ps8788b 01/23/06 pi2pcie412-d enhanced, 1.8v, pci express compliant, 4-differential channel, 2:1 mux/demux switch storage temperature .................................................... C65c to +150c supply voltage to ground potential ................................ C0.5v to +2.5v dc input voltage ............................................................... C0.5v to v cc dc output current ............................................................... ........ 120ma power dissipation ............................................................... ............ 0.5w note: stresses greater than those listed under maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specifcation is not implied. expo - sure to absolute maximum rating conditions for extended periods may affect reliability. maximum ratings (above which useful life may be impaired. for user guidelines, not tested.) dc electrical characteristics for switching over operating range (t a = C40c to +85c, v cc = 1.5v to 2.0v) paramenter description test conditions (1) min typ (2) max units v ih input high voltage guaranteed high level 0.65 x v cc v v il input low voltage guaranteed low level C0.5 0.35 x v cc v ik clamp diode voltage v cc = max., i in = C18ma C0.7 C1.2 i ih input high current v cc = max., v in = v cc 5 a i il input low current v cc = max., v in = gnd 5 dynamic electrical characteristics over the operating range (t a = -40o to +85oc, v cc = 1.8v10%, gnd=0v) parameter description test conditions min. typ. (2) max. units x talk crosstalk see fig. 1 for measurement setup, f = 10 mhz -65 db o irr off isolation see fig. 2 for measurement setup, f = 10 mhz -65 notes: 1. for max. or min. conditions, use appropriate value specifed under electrical characteristics for the applicable device type. 2. typical values are at v cc = 1.8v, t a = 25c ambient and maximum loading. power supply characteristics parameters description test conditions (1) min. typ. (2) max. units i cc quiescent power supply current v cc = max., v in = gnd or v cc 200 a
3 ps8788b 01/23/06 pi2pcie412-d enhanced, 1.8v, pci express compliant, 4-differential channel, 2:1 mux/demux switch fig 1. crosstalk setup fig 2. off-isolation setup ???????????? ? ? ? ??? ????? ?????? ?????? ?????? ??????? ??? ????? ??? ???? ???????????? ? ? ? ??? ????? ?????? ?????? ?????? ??????? ??? ????
4 ps8788b 01/23/06 pi2pcie412-d enhanced, 1.8v, pci express compliant, 4-differential channel, 2:1 mux/demux switch fig 3. crosstalk fig 4. off isolation
5 ps8788b 01/23/06 pi2pcie412-d enhanced, 1.8v, pci express compliant, 4-differential channel, 2:1 mux/demux switch switching characteristics (t a = -40o to +85oc, v cc = 1.8v10%) paramenter description min. max. units t pzh , t pzl line enable time - sel to a n , b n 0.5 8.0 ns t phz , t plz line disable time - sel to a n , b n 0.5 4.0 t b-b bit-to-bit skew within the same differential pair 10 ps t ch-ch channel-to-channel skew 35 ps r t 4pf c l v cc v in v out 200-ohm 200-ohm 2 x v cc pulse generator d.u. t test circuit for electrical characteristics (1-5) notes: 1. c l = load capacitance: includes jig and probe capacitance. 2. r t = termination resistance: should be equal to z out of the pulse generator 3. output 1 is for an output with internal conditions such that the output is low except when disabled by the output control. output 2 is for an output with internal conditions such that the output is high except when disabled by the output control. 4. all input impulses are supplied by generators having the following characteristics: prr mhz, z o = 50?, t r 2.5ns, t f 2.5ns. 5. the outputs are measured one at a time with one transition per measurement. switch positions test switch t plz , t pzl (output on b-side) 2 x v cc t phz , t pzh (output on b-side) gnd prop delay open switching waveforms voltage waveforms enable and disable times ? ??? ? ?? ?? ? ?? ?? ? ?? ? ?? ? ?? ? ? ??? ? ????? ? ????? ? ??? ? ??? ? ??? ??????? ? ??????? ? ? ?? ? ?? ??? ? ?? ? ??????? ? ??? ???????
6 ps8788b 01/23/06 pi2pcie412-d enhanced, 1.8v, pci express compliant, 4-differential channel, 2:1 mux/demux switch test circuit for dynamic electrical characteristics ???????????? ?? ?? ?? ??? ????? ????????????????????? applications information rail-to-rail is a registered trademark of nippon motorola, ltd pci express application specifc measurements and test set-up figure 5: test setup pi2pcie412-d 50-ohm ter mination to ground pe r icom test board motherboard the trace on test card is 22.5" or 13.7 pci-express 1x connector pci-express dr iv ers root complex chipset one pair of the upstream tx signal 4.5" trace tp 2 tp1 + C capacitor s
7 ps8788b 01/23/06 pi2pcie412-d enhanced, 1.8v, pci express compliant, 4-differential channel, 2:1 mux/demux switch figure 6: th e worst non-transition signal eye (left) and the worst transition signal eye (right) of the pci-sig compliance software test using pi2pcie412-d + 22.5" test card figure 7. the worst non-transition signal eye (left) and the worst transition signal eye (right) of the pci-sig compliance software test with no switch + w/ 22.5" test card
8 ps8788b 01/23/06 pi2pcie412-d enhanced, 1.8v, pci express compliant, 4-differential channel, 2:1 mux/demux switch figure 8: th e worst non-transition signal eye (left) and the worst transition signal eye (right) of the pci-sig compliance software test using pi2pcie412-d + 13.7" test card figure 9: th e worst non-transition signal eye (left) and the worst transition signal eye (right) of the pci-sig compliance software test with no switch + 13.7" test card
9 ps8788b 01/23/06 pi2pcie412-d enhanced, 1.8v, pci express compliant, 4-differential channel, 2:1 mux/demux switch ordering information ordering code package code package description pi2pcie412-dzhe zh pb-free & green, 42-contact tqfn notes: ? thermal characteristics can be found on the company web site at www .pericom.com/packaging/ ? "e" denotes pb-free and green ? adding an "x" at the end of the ordering code denotes tape and reel packaging pericom semiconductor corporation ? 1-800-435-2336 ? www.pericom.com packaging mechanical: 42-contact tqfn (zh) 3.500.10 9.00.10 0.5 0.25.05 0.20 ref . 0.6.03 0.800.04 2.05.05 7.55.05 pin #1 corner pin #1 corner 0.40.05
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