1 ps8961d 12/11/08 features ? 1:2 gigabit lan switch ? power-down support ? low bit-to-bit skew: 200ps ? very low crosstalk: ?75db @ 250mhz ? status indicator leds switched with ethernet pairs ? v dd operating range: +3.0v to +3.6v ? enhanced esd protection (on a, b, c, led pins): ? 8kv (contact) (1) ? 1.0kv (machine model), 11kv (human body model) ? >650 mhz bandwidth ? packaging: ? 56-contact tqfn (5 x 11mm, 0.5 pitch) ? 42-contact tqfn (3.5 x 9mm, 0.5 pitch) ? 42-contact tqfn (3.5 x 7mm, 0.4 pitch) description the pi3l720 is a 8-channel 2:1 multiplexer/demultiplexer lan switch with hi-z outputs. industry leading advantages include a propagation delay of less than 250ps, resulting from its low channel resistance and i/o capacitance. the device multiplexes differential outputs from a gigabit ethernet transceiver (phy) device to one of two corresponding b or c outputs. the switch is bidirectional and offers little or no attenuation of the high-speed signals at the outputs. it is designed for low bit-to-bit skew, high channel-to- channel noise isolation and is compatible with various standards, such as 10/100/1000 base-t (ethernet). the pi3l720 provides a power down input (pd), which can put the device into standby mode (pd=1) while mobile, eliminating an external power switch. generally, this part can be used to replace mechanical relays in low-voltage lan applications that interface a physical layer over cat 5 or cat 6 unshielded twisted pair cable through an isolation transformer. block diagram pi3l720 2:1 mux/demux gigabit ethernet lan switch with power-down mode sel a3- a3+ a0- a0+ b0- b0+ c0- c0+ b3- b3+ c3- c3+ pd power down led a0 led a1 led a2 led b0 led c0 led b1 led c1 led b2 led c2 truth table pd sel function lla x to b x ; leda x to ledb x lha x to c x ; lea x to ledc x h x hi-z note: 1. iec 6100-4-2 applications ? dual physical layer device sharing to one interface connector, or one controller to dual connectors for docking ? routes signals for 10/100/1000 mbit ethernet 08-0322
2 ps8961d 12/11/08 pi3l720 2:1 mux/demux gigabit ethenet lan switch with power-down mode pin description pin name description a x +, a x - port a demux i/o b x +, b x - port b mux i/o c x +, c x - port c led mux i/o gnd ground led zx led i/o pd power down. active high, with internal pull-down resistor sel select v dd power pin con guration (42-tqfn zh, top-side view) v dd a0+ a0- v dd pd a1+ a1- v dd a2+ a2- a3+ a3- sel v dd leda0 leda1 ledb0 b0+ b0- c0+ c0- b1+ b1- c1+ c1- v dd b2+ b2- c2+ c2- b3+ b3- c3+ c3- 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 leda2 ledb2 ledc2 v dd ledb1 ledc0 ledc1 vdd 18 19 20 21 42 41 40 39 gnd pin con guration (56-tqfn top-side view) gnd a0+ a0- v dd pd gnd a1+ a1- gnd v dd a2+ a2- gnd a3+ a3- gnd sel v dd leda0 leda1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 v dd gnd leda2 gnd ledb2 ledc2 v dd gnd gnd ledb0 ledb1 gnd ledc0 ledc1 v dd gnd 21 22 23 24 25 26 27 28 56 55 54 53 52 51 50 49 b0+ b0- c0+ c0- gnd b1+ b1- c1+ c1- gnd v dd b2+ b2- c2+ c2- gnd b3+ b3- c3+ c3- gnd pin con guration (42-tqfn zl, top-side view) v dd a0+ a0- v dd pd a1+ a1- v dd a2+ a2- a3+ a3- sel v dd leda0 leda1 b0- c0+ c0- b1+ b1- c1+ c1- v dd b2+ b2- c2+ c2- b3+ b3- c3+ c3- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 leda2 ledb2 ledc2 v dd ledb1 ledc0 ledc1 vdd 18 19 20 21 42 41 40 39 gnd 17 ledb0 38 b0+ 08-0322
3 ps8961d 12/11/08 pi3l720 2:1 mux/demux gigabit ethenet lan switch with power-down mode dc electrical characteristics for 1000 base-t ethernet switching over operating range (t a = ?40c to +85c, v dd = 3.3v 10%) paramenter description test conditions (1) min. typ. (2) max. units v ih input high voltage guaranteed high level (control pins) 2.0 ? ? v v il input low voltage guaranteed low level (control pins) ?0.5 ? 0.8 v ik clamp diode voltage v dd = max., i in = ?18ma ? ?0.7 ?1.2 i ih input high current v dd = max., v in = v dd ??2 a i il input low current v dd = max., v in = gnd ? ? 2 r on switch on-resistance (3) v dd = min., 1.5v v in v dd i in = ?40ma ? 4.0 6.5 ohm r flat(on) on-resistance flatness (3) v dd = min., v in @ 1.5v and v dd i in = ?40ma ? 0.5 ? r on on-resistance match from center ports to any other port (3) v dd = min., 1.5v v in v dd i in = ?40ma ? 0.4 1.0 dc electrical characteristics for 10/100 base-t ethernet switching over operating range (t a = ?40c to +85c, v dd = 3.3v 10%) paramenter description test conditions (1) min. typ. (2) max. units v ih input high voltage guaranteed high level (control pins) 2.0 ? ? v v il input low voltage guaranteed low level (control pins) ?0.5 ? 0.8 v ik clamp diode voltage v dd = max., i in = ?18ma ? ?0.7 ?1.2 i ih input high current v dd = max., v in = v dd ??2 a i il input low current v dd = max., v in = gnd ? ? 2 r on switch on-resistance (3) v dd = min., 1.25v v in v dd i in = ?10ma to ?30ma ? 4.0 6.5 ohm r flat(on) on-resistance flatness (3) v dd = min., v in @ 1.25v and v dd i in = ?10ma to ?30ma ? 0.5 ? ?r on on-resistance match from cen- ter ports to any other port (3) v dd = min., 1.25v v in v dd i in = ?10ma to ?30ma ? 0.4 1.0 storage temperature ........................................................ ?65c to +150c supply voltage to ground potential ........................... ?0.5v to +4.0v dc input voltage ................................................................ ?0.5v to +5.5v dc output current .......................................................................... 120ma power dissipation .............................................................................. 0.5w note: stresses greater than those listed under max i mum rat- ings may cause permanent damage to the de vice. this is a stress rating only and func tion al op er a tion of the device at these or any other conditions above those indicated in the operational sections of this spec i ca tion is not implied. exposure to absolute max i mum rating con di tions for ex- tended periods may affect re li abil i ty. maximum ratings (above which useful life may be impaired. for user guide lines, not tested.) 08-0322
4 ps8961d 12/11/08 pi3l720 2:1 mux/demux gigabit ethenet lan switch with power-down mode power supply characteristics parameters description test conditions (1) min. typ. (2) max. units i dd-standby (3) quiescent power supply current v dd = max., v in = gnd or v dd ? 0.3 0.5 ma i dd-active (3) active power supply current v dd = max., v in = v dd or gnd 1.0 1.5 ma i dd-pd (3) power down current pd = 1, v dd = max, v in = v dd or gnd 0.15 0.25 ma notes: 1. for max. or min. conditions, use appropriate value speci ed under electrical characteristics for the applicable device type. 2. typical values are at v dd = 3.3v, t a = 25c ambient and maximum loading. 3. measured by the voltage drop between a and b pins at indicated current through the switch. on resistance is determined by the lower of the voltages on the two (a & b) pins. 4. this parameter is determined by device characterization but is not production tested. capacitance (t a = ?40c to +85c, v dd = 3.3v 10%) parameters (4) description test conditions (1) min. typ. max. units c in input capacitance v in = 0v, f = 1mhz 2.0 3.0 pf c off(b1, b2) port b capacitance, switch off 3.0 6.0 c on(a/b) a/b capacitance, switch on 8.0 11.0 notes: 1. for max. or min. conditions, use appropriate value speci ed under electrical characteristics for the applicable device type. 2. typical values are at v dd = 3.3v, t a = 25c ambient and maximum loading.. 3. active power represents normal data communication. standby power is when the device is enabled for operation but there is no lan traf c (cable not connected). power down current is the minimum power state used when not connected and mobile. 4. the bus switch contributes no propagational delay other than the rc delay of the on resistance of the switch and the load ca pacitance. the time constant for the switch alone is of the order of 0.25ns for 10pf load. since this time constant is much smaller than the rise/fall times of typical driving signals, it adds very little propagational delay to the system. propagational delay of the bus switch when used in a system is determined by the driving circuit on the driving side of the switch and its interactions with the load on the driven side. dynamic electrical characteristics over the operating range (t a = ?40c to +85c, v dd = 3.3v 10%) parameter description test conditions (1) min. typ. (2) max. units x talk crosstalk (3) r l = 100-ohm, f = 250mhz ? ?75 ? db o irr off isolation (3) ? ?35 ? bw bandwidth ?3db (3) r l = 100-ohm ? 650 ? mhz notes: 1. for max. or min. conditions, use appropriate value speci ed under electrical characteristics for the applicable device type. 2. typical values are at v dd = 3.3v, t a = 25c ambient and maximum loading.. 3. guaranteed by design. 4. the bus switch contributes no propagational delay other than the rc delay of the on resistance of the switch and the load ca pacitance. the time constant for the switch alone is of the order of 0.25ns for 10pf load. since this time constant is much smaller than the rise/fall times of typical driving signals, it adds very little propagational delay to the system. propagational delay of the bus switch when used in a system is determined by the driving circuit on the driving side of the switch and its interactions with the load on the driven side. 08-0322
5 ps8961d 12/11/08 pi3l720 2:1 mux/demux gigabit ethenet lan switch with power-down mode notes: 1. for max. or min. conditions, use appropriate value speci ed under electrical characteristics for the applicable device type. 2. typical values are at v dd = 3.3v, t a = 25c ambient and maximum loading.. 3. guaranteed by design. 4. the bus switch contributes no propagational delay other than the rc delay of the on resistance of the switch and the load ca pacitance. the time constant for the switch alone is of the order of 0.25ns for 10pf load. since this time constant is much smaller than the rise/fall times of typical driving signals, it adds very little propagational delay to the system. propagational delay of the bus switch when used in a system is determined by the driving circuit on the driving side of the switch and its interactions with the load on the driven side. switching characteristics (t a = -40c to +85c, v dd = 3.3v 10%) paramenter description min. typ. (2) max. units t pd propagation delay (3,4) ? 0.25 ns t pzh , t pzl line enable time - sel to a n , b n 0.5 ? 15.0 t phz , t plz line disable time - sel to a n , b n 0.5 ? 5.0 t sk(o) output skew between center port to any other port (3) ? 0.1 0.2 t sk(p) skew between opposite transitions of the same output (t phl - t plh ) (3) ? 0.1 0.2 t on/off device enable / disable time from pd 100 200 08-0322
6 ps8961d 12/11/08 pi3l720 2:1 mux/demux gigabit ethenet lan switch with power-down mode test circuit for electrical characteristics notes: c l = load capacitance: includes jig and probe capacitance. r t = termination resistance: should be equal to z out of the pulse generator test circuit for dynamic electrical characteristics v dd d.u.t t1 r1 s1 hp11667a 50-ohm 10pf hp8753es switch positions test switch t plz , t pzl (output on b-side) 6.0v t phz , t pzh (output on b-side) gnd prop delay open r t 10pf c l v dd v in v out 200-ohm 200-ohm 6.0v pulse generator d.u.t 08-0322
7 ps8961d 12/11/08 pi3l720 2:1 mux/demux gigabit ethenet lan switch with power-down mode voltage waveforms propagation delay times switching waveforms output skew - t sk(o) pulse skew - t sk(p) voltage waveforms enable and disable times data in data out at channel x data out at channel y t plhx t phlx 3.5v 2.5v 2.5v 2.5v i t sk(o) = i t plhy ? t plhx i or i t phly ? t phlx i t sk(o) t plhy t phly v oh v ol v ol v oh 1.5v input output t plh t sk(p) = i t phl ? t plh i t phl 3.5v 2.5v 2.5v v ol v oh 1.5v t plz 1.25v 1.25v 2.5v v oh 0v v ol v dd/2 v dd/2 t phz t pzl t pzh output output v ol +0.3v v oh ?0.3v v ol v oh sel applications information logic inputs the logic control inputs can be driven up to +3.6v regardless of the supply voltage. for example, given a +3.3v supply, the ou tput enables or select pins may be driven low to 0v and high to 3.6v. driving in rail-to-rail? minimizes power consumption. power-supply sequencing proper power-supply sequencing is advised for all cmos devices. it is recommended to always apply v dd before applying signals to the input/output or control pins. rail-to-rail is a registered trademark of nippon motorola, ltd input t plh 2.5v 2.5v 2.5v 2.5v t phl 3.5v 1.5v output v oh v ol notes: waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. all input impulses are supplied by generators having the following characteristics: prr mhz, z o = 50-ohm, t r 2.5ns, t f 2.5ns. 08-0322
8 ps8961d 12/11/08 pi3l720 2:1 mux/demux gigabit ethenet lan switch with power-down mode packaging mechanical: 56-contact tqfn (zf) description: 56-contact, thin fine pitch quad flat no-lead (tqfn) package code: zf56 document control #: pd-2024 revision: c date: 05/15/08 08-0322
9 ps8961d 12/11/08 pi3l720 2:1 mux/demux gigabit ethenet lan switch with power-down mode packaging mechanical: 42-contact tqfn (zh) description: 42-contact thin fine pitch quad flat no-lead (tqfn) package code: zh (zh42) document control #: pd-2035 revision: b date: 03/03/08 08-0098 08-0322
10 ps8961d 12/11/08 pi3l720 2:1 mux/demux gigabit ethenet lan switch with power-down mode pericom semiconductor corporation ? 1-800-435-2336 ? www.pericom.com notes: 1. thermal characteristics can be found on the company web site at www.pericom.com/packaging/ 2. add 'x' for tape and reel ordering information ordering number package code package description pi3l720zfe zf pb-free & green, 56-contact tqfn PI3L720ZHE zh pb-free & green, 42-contact tqfn (0.5mm pitch) pi3l720zle zl pb-free & green, 42-contact tqfn (0.4mm pitch) packaging mechanical: 42-contact tqfn (zl) : 42-lead, thin fine pitch quad flat no-lead (tqfn) noitpircsed :edoc egakcap 2082 -dp :# lortnoc tnemucod -- :noisiver 80/22/90 :etad zl42 08-0470 08-0322
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