1 industrial temperature range idtqs3vh16861 2.5v / 3.3v 20-bit flow-through pin out, high bandwidth bus switch november 2001 2001 integrated device technology, inc. dsc-5875/3 c idtqs3vh16861 industrial temperature range quickswitch ? products 2.5v/ 3.3v 20-bit flow-through pin out, high bandwidth bus switch functional block diagram description: the qs3vh16861 hotswitch with 20-bit flow-though pin out is a high bandwidth bus switch. the qs3vh16861 has very low on resistance, resulting in under 250ps propagation delay through the switch. the switches are controlled by active low enable ( bex ) controls. in the on state, the switches can pass signals up to 5v. in the off state, the switches offer very high impedence at the terminals. the combination of near-zero propagation delay, high off impedance, and over-voltage tolerance makes the qs3vh16861 ideal for high perfor- mance communications applications. the qs3vh16861 is characterized for operation from -40c to +85c. a 0 a 9 b 0 b 9 be1 a 10 a 19 b 10 b 19 be2 the idt logo is a registered trademark of integrated device technology, inc. features: ? n channel fet switches with no parasitic diode to vcc ? ? ? ? ? isolation under power-off conditions ? ? ? ? ? no dc path to vcc or gnd ? ? ? ? ? 5v tolerant in off and on state ? 5v tolerant i/os ? low r on - 4 ? ? ? ? ? typical ? flat r on characteristics over operating range ? rail-to-rail switching 0 - 5v ? bidirectional dataflow with near-zero delay: no added ground bounce ? excellent r on matching between channels ? vcc operation: 2.3v to 3.6v ? high bandwidth - up to 500 mhz ? lvttl-compatible control inputs ? undershoot clamp diodes on all switch and control inputs ? low i/o capacitance, 4pf typical ? available in ssop and tssop packages applications: ? hot-swapping ? 10/100 base-t, ethernet lan switch ? low distortion analog switch ? replaces mechanical relay ? atm 25/155 switching
2 industrial temperature range idtqs3vh16861 2.5v / 3.3v 20-bit flow-through pin out, high bandwidth bus switch absolute maximum ratings (1) symbol description max. unit v term (2) supply voltage to ground ? 0.5 to 4.6 v v term (3) dc switch voltage v s ? 0.5 to 5.5 v v term (3) dc input voltage v in ? 0.5 to 5.5 v v ac ac input voltage (pulse width 20ns) ? 3 v i out dc output current (max. current/pin) 120 ma t stg storage temperature -65 to +150 c notes: 1. stresses greater than those listed under absolute 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 specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. v cc terminals. 3. all terminals except v cc . pin configuration ssop/ tssop top view 48 nc v cc 1 47 be1 2 a 0 46 3 a 1 b 0 45 4 a 2 b 1 44 5 a 3 b 2 43 6 a 4 b 3 41 8 a 6 b 5 40 9 a 7 b 6 39 10 a 8 b 7 42 7 a 5 b 4 38 11 a 9 b 8 37 gnd 12 b 9 36 nc v cc 13 35 be2 14 a 10 34 15 a 11 b 10 33 16 a 12 b 11 32 17 a 13 b 12 31 18 a 14 b 13 29 20 a 16 b 15 28 21 a 17 b 16 27 22 a 18 b 17 30 19 a 15 b 14 26 23 a 19 b 18 25 gnd 24 b 19 capacitance (t a = +25 o c, f = 1mhz, v in = 0v, v out = 0v) symbol parameter (1) typ. max. unit c in control inputs 3 5 pf c i/o quickswitch channels (switch off) 4 6 pf c i/o quickswitch channels (switch on) 8 12 pf note: 1. this parameter is guaranteed but not production tested. pin description pin names description bex active low bus enable a 0 - a 19 bus a b 0 - b 19 bus b function table (1) be 1 be 2 a 0 - a 9 a 10 - a 19 function ll b 0 - b 9 b 10 - b 19 connect lh b 0 - b 9 z connect b 0 - b 9, disconnect b 10 - b 19 hl z b 10 - b 19 disconnect b 0 - b 9, connect b 10 - b 19 h h z z disconnect note: 1. h = high voltage level l = low voltage level z = high-impedence
3 industrial temperature range idtqs3vh16861 2.5v / 3.3v 20-bit flow-through pin out, high bandwidth bus switch dc electrical characteristics over operating range (1) following conditions apply unless otherwise specified: industrial: t a = ?40c to +85c, v cc = 3.3v 0.3v symbol parameter test conditions min. typ. (1) max. unit v ih input high voltage guaranteed logic high v cc = 2.3v to 2.7v 1.7 ? ? v for control inputs v cc = 2.7v to 3.6v 2 ? ? v il input low voltage guaranteed logic high v cc = 2.3v to 2.7v ? ? 0.7 v for control inputs v cc = 2.7v to 3.6v ? ? 0.8 i in input leakage current (control inputs) 0v v in v cc ??1a i oz off-state current (hi-z) 0v v out 5v, switches off ? ? 1 a i off data input/output power off leakage v in or v out 0v to 5v, v cc = 0v ? ? 1 a v cc = 2.3v v in = 0v i on = 30ma ? 6 8 r on switch on resistance (typ. at v cc = 2.5v) v in = 1.7v i on = 15ma ? 7 9 ? v cc = 3v v in = 0v i on = 30ma ? 4 6 v in = 2.4v i on = 15ma ? 5 8 note: 1. typical values are at v cc = 3.3v and t a = 25c, unless otherwise noted. typical on resistance vs v in at v cc = 3.3v 16 14 12 10 8 6 4 2 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 5.0 4.5 r on (ohms) v in (volts)
4 industrial temperature range idtqs3vh16861 2.5v / 3.3v 20-bit flow-through pin out, high bandwidth bus switch power supply characteristics symbol parameter test conditions (1) min. typ. max. unit i ccq quiescent power supply current v cc = max., v in = gnd or v cc , f = 0 ? 1.5 3 ma ? i cc power supply current (2,3) per input high v cc = max., v in = 3v, f = 0 per control input ? ? 30 a i ccd dynamic power supply current (4) v cc = 3.3v, a and b pins open, control inputs see typical i ccd vs enable frequency graph below toggling @ 50% duty cycle notes: 1. for conditions shown as min. or max., use the appropriate values specified under dc electrical characteristics. 2. per input driven at the specified level. a and b pins do not contribute to ? icc. 3. this parameter is guaranteed but not tested. 4. this parameter represents the current required to switch internal capacitance at the specified frequency. the a and b inputs do not contribute to the dynamic power supply current. this parameter is guaranteed but not production tested. 0 2 4 6 8 10 12 14 0 2 4 6 8 10 12 14 16 18 20 typical i ccd vs enable frequency curve at v cc = 3.3v i ccd (ma) enable frequency (mhz)
5 industrial temperature range idtqs3vh16861 2.5v / 3.3v 20-bit flow-through pin out, high bandwidth bus switch switching characteristics over operating range t a = -40c to +85c v cc = 2.5 0.2v (1) v cc = 3.3 0.3v (1) symbol parameter min . (4) max. min . (4) max. unit t plh data propagation delay (2,3) ? 0.2 ? 0.2 ns t phl a to b or b to a t pzh switch turn-on delay 1.5 8.5 1.5 8 ns t pzl bex to xa or xb t phz switch turn-off delay 1.5 7.5 1.5 7.5 ns t plz bex to xa or xb f bex operating frequency - enable (2,5) ? 10 ? 20 mhz notes: 1. see test conditions under test circuits and waveforms. 2. this parameter is guaranteed but not production tested. 3. the bus switch contributes no propagation delay other than the rc delay of the on resistance of the switch and the load capac itance. the time constant for the switch alone is of the order of 0.2ns at c l = 50pf. since this time constant is much smaller than the rise and fall times of typical driving signals, it adds very little propagation delay to the system. propagation delay of the bus switch, when used in a system, is determined by the driving circuit on the driving side o f the switch and its interaction with the load on the driven side. 4. minimums are guaranteed but not production tested. 5. maximum toggle frequency for bex control input (pass voltage > v cc , v in = 5v, r load > 1m ? , no c load ).
6 industrial temperature range idtqs3vh16861 2.5v / 3.3v 20-bit flow-through pin out, high bandwidth bus switch phy 3vh switch 4.5v pp logic side z = 100 ? 10mbps to 100mbps 2v pp 4.5v pp logic side z = 100 ? twisted pair >100m charge pump oe vcc = 3.3v 0 to +5v nfet +6.5v driver 0 to +5v single hot switch card i/o on card logic connector qs3vhxxx cpu ram bus card i/o on card logic connector qs3vhxxx pluggable card/ live system zero down time system rail-to-rail switching some applications for hotswitch products fast ethernet data switching (lan switch) hot swapping
7 industrial temperature range idtqs3vh16861 2.5v / 3.3v 20-bit flow-through pin out, high bandwidth bus switch open v load gnd v cc pulse generator d.u.t. 500 ? 500 ? c l r t v in v out (1, 2) same phase input transition opposite phase input transition 0v 0v v oh v ol t plh t phl t phl t plh output v ih v t v t v ih v t control input t plz 0v output normally low t pzh 0v switch closed output normally high enable disable switch open t phz 0v v ol + v lz v oh v t v t t pzl v load/2 v load/2 v ih v t v ol v oh - v hz test circuits and waveforms enable and disable times note: 1. diagram shown for input control enable-low and input control disable-high. propagation delay test circuits for all outputs definitions: c l = load capacitance: includes jig and probe capacitance. r t = termination resistance: should be equal to z out of the pulse generator. notes: 1. pulse generator for all pulses: rate 1.0mhz; t f 2.5ns; t r 2.5ns. 2. pulse generator for all pulses: rate 1.0mhz; t f 2ns; t r 2ns. switch position test switch t plz / t pzl v load t phz/ t pzh gnd t pd open test conditions symbol v cc (1) = 3.3v 0.3v v cc (2) = 2.5v 0.2v unit v load 6 2 x vcc v v ih 3 vcc v v t 1.5 v cc /2 v v lz 300 150 mv v hz 300 150 mv c l 50 30 pf
8 industrial temperature range idtqs3vh16861 2.5v / 3.3v 20-bit flow-through pin out, high bandwidth bus switch idtqs xxxxx xx package device type 3vh16861 2.5v / 3.3v 20-bit flow though pin out, high bandwidth bus switch pv pa pag shrink small outline package thin shrink small outline package tssop - green ordering information corporate headquarters for sales: for tech support: 2975 stender way 800-345-7015 or 408-727-6116 logichelp@idt.com santa clara, ca 95054 fax: 408-492-8674 (408) 654-6459 www.idt.com
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