1 industrial temperature range idtQS34XVH245 2.5v / 3.3v 32-bit high bandwidth bus switch 2003 integrated device technology, inc. dsc-5593/10 c industrial temperature range description: the QS34XVH245 hotswitch is a high bandwidth 32-bit bus switch. the QS34XVH245 has very low on resistance, resulting in under 250ps propa- gation delay through the switch. the switches can be turned on under the control of individual lvttl-compatible output enable ( oex ) signals for bidirectional data flow with no added delay or ground bounce. in the on state, the switches can pass 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 QS34XVH245 ideal for high performance communications applications. the QS34XVH245 is characterized for operation from -40 c to +85 c. the idt logo is a registered trademark of integrated device technology, inc. applications: ? hot-swapping ? 10/100 base-t, ethernet lan switch ? low distortion analog switch ? replaces mechanical relay ? atm 25/155 switching features: ? n channel fet switches with no parasitic diode to v cc ? isolation under power-off conditions ? no dc path to v cc 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 ?v cc operation: 2.3v to 3.6v ? high bandwidth - up to 500mhz ? lvttl-compatible control inputs ? undershoot clamp diodes on all switch and control inputs ? low i/o capacitance, 4pf typical ? available in 80-pin qvsop package quickswitch ? products 2.5v / 3.3v 32-bit high bandwidth bus switch functional block diagram b0 oe1 a0 b1 a1 b2 a2 b3 a3 b4 a4 b5 a5 b6 a6 b7 a7 b8 oe2 a8 b9 a9 b10 a10 b11 a11 b12 a12 b13 a13 b14 a14 b15 a15 oe3 a16 a17 a18 a19 a20 a21 a22 a23 oe4 b16 b17 b18 b19 b20 b21 b22 b23 a24 a25 a26 a27 a28 a29 a30 a31 b24 b25 b26 b27 b28 b29 b30 b31 march 2003 idtQS34XVH245
2 industrial temperature range idtQS34XVH245 2.5v / 3.3v 32-bit high bandwidth bus switch pin configuration symbol description max unit v term (2) supplyvoltage 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. sink current/pin) 120 ma t stg storage temperature ?65 to +150 c absolute maximum ratings (1) 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 . 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 capacitance (t a = +25c, f = 1mhz, v in = 0v, v out = 0v) note: 1. h = high voltage level l = low voltage level oex function h disconnected l connect (ax = bx) function table (1) note: 1. this parameter is guaranteed but not production tested. pin names i/o description oex i output enable a x i/o bus a b x i/o bus b pin description qvsop top view nc a 0 a 1 a 2 a 3 gnd a 10 a 11 a 12 a 13 nc a 20 a 21 a 22 a 23 gnd a 24 a 25 gnd gnd 2 3 4 5 6 7 8 73 74 75 76 77 78 79 80 1 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 56 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 39 38 37 36 35 34 33 32 31 30 29 28 27 26 40 25 58 59 60 61 62 63 64 65 66 67 68 69 70 71 57 72 vcc vcc vcc vcc a 4 a 5 a 6 a 7 a 8 a 9 a 14 a 15 a 16 a 17 a 18 a 19 a 26 a 27 a 28 a 29 a 30 a 31 b 0 b 1 b 2 b 3 b 4 b 5 b 6 b 7 b 10 b 11 b 12 b 13 b 8 b 9 b 14 b 15 b 20 b 21 b 22 b 23 b 16 b 17 b 18 b 19 b 24 b 25 b 26 b 27 b 28 b 29 b 30 b 31 nc nc oe 1 oe 2 oe 3 oe 4
3 industrial temperature range idtQS34XVH245 2.5v / 3.3v 32-bit high bandwidth bus switch typical on resistance vs v in at v cc = 3.3v r on (ohms) v in (volts) 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 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 low 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 typical 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 dc electrical characteristics over operating range following conditions apply unless otherwise specified: industrial: t a = ?40c to +85c, v cc = 3.3v 0.3v note: 1. typical values are at v cc = 3.3v and t a = 25c.
4 industrial temperature range idtQS34XVH245 2.5v / 3.3v 32-bit high bandwidth bus switch 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. 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 ? 4 12 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 per output v cc = 3.3v, a and b pins open, control inputs see typical i ccd vs enable frequency graph below enable control input (4) toggling @ 50% duty cycle typical i ccd vs enable frequency curve at v cc = 3.3v 0 2 4 6 8 10 12 0 2 4 6 8 10 12 14 16 18 20 i ccd (ma) enable frequency (mhz)
5 industrial temperature range idtQS34XVH245 2.5v / 3.3v 32-bit 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 ax to/from bx t pzh switch turn-on delay 1.5 8 1.5 7 ns t pzl oex to ax/bx t phz switch turn-off delay 1.5 7 1.5 6.5 ns t plz oex to ax/bx f oex 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 oex control input (pass voltage > v cc , v in = 5v, r load 1m ? , no c load ).
6 industrial temperature range idtQS34XVH245 2.5v / 3.3v 32-bit 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 qs34vhxxx cpu ram bus card i/o on card logic connector qs34vhxxx pluggable card/ live system zero down time system rail-to-rail switching some applications for hotswitch products hot-swapping fast ethernet data switching (lan switch)
7 industrial temperature range idtQS34XVH245 2.5v / 3.3v 32-bit high bandwidth bus switch test circuits and waveforms 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 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 note: 1. diagram shown for input control enable-low and input control disable-high. notes: 1. pulse generator for all pulses: rate 10mhz; t f 2.5ns; t r 2.5ns. 2. pulse generator for all pulses: rate 10mhz; t f 2ns; t r 2ns. definitions: c l = load capacitance: includes jig and probe capacitance. r t = termination resistance: should be equal to z out of the pulse generator. switch position test switch t plz / t pzl v load t phz/ t pzh gnd t pd open propagation delay test circuits for all outputs enable and disable times
8 industrial temperature range idtQS34XVH245 2.5v / 3.3v 32-bit high bandwidth bus switch ordering information idtqs xxxxx xx package device type 34xvh245 2.5v / 3.3v 32-bit high bandwidth bus switch q3 q3g 80-pin qvsop qvsop - green 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 8/6/2002 updated according to pcn logic-0206-11 3/3/2003 changed icc limits data sheet document history
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