1 industrial temperature range IDTQS3VH245 2.5v / 3.3v 8-bit high bandwidth bus switch 2014 integrated device technology, inc. dsc-5775/10 c IDTQS3VH245 industrial temperature range quickswitch ? products 2.5v / 3.3v 8-bit high bandwidth bus switch functional block diagram description: the qs3vh245 hotswitch 8-bit bus switch is a high bandwidth bus switch. the qs3vh245 has very low on resistance, resulting in under 250ps propagation delay through the switch. the switches can be turned on under the control of the lvttl-compatible output enable signal for bidirectional data flow with no added delay or ground bounce. 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 qs3vh245 ideal forhigh perfor- mance communications applications. the qs3vh245 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 ? bus switching and isolation 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 qsop, soic, and tssop packages b 0 oe a 0 b 1 a 1 b 2 a 2 b 3 a 3 b 4 a 4 b 5 a 5 b 6 a 6 b 7 a 7 february 2014
2 industrial temperature range IDTQS3VH245 2.5v / 3.3v 8-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. this parameter is guaranteed but not production tested. pin names description oe output enable ax data i/os bx data i/os pin description note: 1. h = high voltage level l = low voltage level oe outputs h disconnected l ax = bx function table (1) qsop/ soic/ tssop top view 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 nc a 0 a 1 a 2 a 3 a 4 a 5 a 6 a 7 gnd v cc oe b 0 b 1 b 2 b 3 b 4 b 5 b 6 b 7
3 industrial temperature range IDTQS3VH245 2.5v / 3.3v 8-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 ??1 a 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 IDTQS3VH245 2.5v / 3.3v 8-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 ? 2 4 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 typical i ccd vs enable frequency curve at v cc = 3.3v 0 2 4 6 8 10 12 0 2 4 6 8 101214161820 i ccd (ma) enable frequency (mhz)
5 industrial temperature range IDTQS3VH245 2.5v / 3.3v 8-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 pzl switch turn-on delay 1.5 8 1.5 7 ns t pzh oe to ax/bx t plz switch turn-off delay 1.5 7 1.5 6.5 ns t phz oe to ax/bx f oe 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 of 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 oe control input (pass voltage > v cc , v in = 5v, r load 1m , no c load ).
6 industrial temperature range IDTQS3VH245 2.5v / 3.3v 8-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 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 IDTQS3VH245 2.5v / 3.3v 8-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 IDTQS3VH245 2.5v / 3.3v 8-bit high bandwidth bus switch ordering information qs xxxxx xx package device type x blank 8 tube or tray tape and reel 3vh245 2.5v / 3.3v 8-bit high bandwidth bus switch sog qg pag soic - green qsop - green tssop - green corporate headquarters for sales: for tech support: 6024 silver creek valley road 800-345-7015 or 408-284-8200 logichelp@idt.com san jose, ca 95138 fax: 408-284-2775 www.idt.com datasheet document history 09/01/08 pg. 4, 8 revise i ccq typ. and max. remove non green package version and updated the ordering information by removing the ?idt? notation. 02/24/14 pg. 8 updated the ordering information by adding tape and reel information.
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