1 industrial temperature range idtqs3vh251 2.5v / 3.3v quad 8:1 mux/demux high bandwidth bus switch august 2002 2002 integrated device technology, inc. dsc-5944/7 c idtqs3vh251 industrial temperature range quickswitch ? products 2.5v / 3.3v 8:1 mux/demux high bandwidth bus switch functional block diagram description: the qs3vh251 hotswitch quad 2:1 multiplexer/demultiplexer is a high bandwidth bus switch. the qs3vh251 has very low on resistance, resulting in under 250ps propagation delay through the switch. the select (sx) input controls the data flow. the multiplexers/demultiplexers are enabled when the enable ( e ) input is low. 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 qs3vh251 ideal for high performance comminucation applications. the qs3vh251 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 ? multiplexing/demultiplexing ? 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 demux capacitance, 4pf typical ? available in qsop and tssop packages s0 y i0 i1 i2 i3 i4 i5 i6 i7 s1 e s2
2 industrial temperature range idtqs3vh251 2.5v / 3.3v quad 8:1 mux/demux 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 demux 4 6 pf (switch off) mux 19 25 c i/o quickswitch channels demux 20 28 pf (switch on) mux 20 28 capacitance (t a = +25c, f = 1mhz, v in = 0v, v out = 0v) note: 1. this parameter is guaranteed but not production tested. pin names i/o description i 0 - i 7 i data inputs s 0 - s 2 i select input e i enable input y o data outputs pin description note: 1. h = high voltage level l = low voltage level x = don't care z = high-impedence function table (1) qsop/ tssop top view 1 2 3 4 5 6 7 16 15 14 13 12 11 10 i 2 i 1 y nc gnd v cc i 5 i 6 i 4 s 0 s 1 i 3 i 0 i 7 8 9 e s 2 select e s 2 s 1 s 0 y function h x x x z disable lllli 0 s 2 - s 0 = 0 lllhi 1 s 2 - s 0 = 1 llhli 2 s 2 - s 0 = 2 llhhi 3 s 2 - s 0 = 3 lhl li 4 s 2 - s 0 = 4 lhlhi 5 s 2 - s 0 = 5 lhh li 6 s 2 - s 0 = 6 lhhhi 7 s 2 - s 0 = 7
3 industrial temperature range idtqs3vh251 2.5v / 3.3v quad 8:1 mux/demux 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 idtqs3vh251 2.5v / 3.3v quad 8:1 mux/demux high bandwidth bus switch typical i ccd vs enable frequency curve at v cc = 3.3v i ccd (ma) enable frequency (mhz) 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. mux/demux 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 mux/demux inp uts 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 ? 1 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 0 2 4 6 0 2 4 6 8 10 12 14 16 18 20
5 industrial temperature range idtqs3vh251 2.5v / 3.3v quad 8:1 mux/demux 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 y to ix or ix to y t sel select time 1.5 9 1.5 8 ns sx to y t pzh enable time 1.5 9 1.5 9 ns t pzl s to ix t phz disable time 1.5 8 1.5 8 ns t plz s to ix t pzh enable time 1.5 9 1.5 8 ns t pzl e to y or ix t phz disable time 1.5 8 1.5 8 ns t plz e to y or ix f e orsx 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 sx or e control input (pass voltage > v cc , v in = 5v, r load 1m ? , no c load ).
6 industrial temperature range idtqs3vh251 2.5v / 3.3v quad 8:1 mux/demux high bandwidth bus switch rail-to-rail switching some applications for hotswitch products multiplexing/demultiplexing hot-swapping
7 industrial temperature range idtqs3vh251 2.5v / 3.3v quad 8:1 mux/demux 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 idtqs3vh251 2.5v / 3.3v quad 8:1 mux/demux high bandwidth bus switch ordering information idtqs xxxxx xx package device type 3vh251 2.5v / 3.3v 8:1 mux/demux high bandwidth bus switch q qg pa quarter size outline package qsop - green thin shrink small outline package 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 data sheet document history
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