1 idtqs34xv245 3.3v high speed 32-bit multiwidth bus switch industrial temperature range november 1999 1999 integrated device technology, inc. dsc-5580/2 c idtqs34xv245 industrial temperature range functional block diagram the idt logo is a registered trademark of integrated device technology, inc. features: ?5 bidirectional switches connect inputs to outputs ? pin compatibility with qs3245 ? 250ps propagation delay ? undershoot clamp diodes on all switch and control inputs ? lvttl-compatible control inputs ? available in 80-pin qvsop package applications: ? 3.3v to 2.5v voltage translation ? 2.5v to 1.8v voltage translation ? pci bus isolation hot swap quickswitch ? products 3.3v high speed 32-bit multiwidth? bus switch description: the qs34xv245 is a set of 32-bit high speed bus switches controlled by lvttl-compatible active low enable signal. when closed, the switches exhibit near zero propagation delay without generating additional ground bounce or switching noise. the qs34xv245 is specially designed for direct interface betweeen 3.3v and 2.5v devices without any external components. when operating from a 3.3v supply, the logic high level at the switch output is clamped to 2.5v when the switch input signal exceeds 2.5v. this device can be used for switching 2.5v buses without signal attenuation. the on resistance at 3.3v v cc is less than 5 typical, providing near zero propagation delay through the switch. absence of dc path from switch i/o pins to v cc or ground makes qs34xv245 an ideal device for hot swapping applications. the qs34xv245 is characterized for operation from -40 c to +85 c. 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
2 industrial temperature range idtqs34xv245 3.3v high speed 32-bit multiwidth bus switch pin configuration note: 1. h = high voltage level l = low voltage level function table (1) capacitance (t a = +25c, f = 1.0mh z , v in = 0v, v out = 0v) note: 1. this parameter is measured at characterization but not tested. pins typ. max. (1) unit control pins 4 6 pf quickswitch channels (switch off) 5 7 pf symbol description max unit v term (2) supply voltage to ground ?0.5 to +4.6 v v term (3) dc switch voltage vs ?0.5 to +4.6 v v term (3) dc input voltage v in ?0.5 to +4.6 v v ac ac input voltage (pulse width 20ns) ?3 v i out dc output current 120 ma p max maximum power dissipation (t a = 85c) 0.92 w t stg storage temperature ?65 to +150 c absolute maximum ratings (1) note: 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. vcc terminals. 3. all terminals except vcc. pin description pin names description oe output enable an, bn data i/os oen function h disconnected l an = bn 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 millipaq top view
3 idtqs34xv245 3.3v high speed 32-bit multiwidth bus switch industrial temperature range symbol parameter test conditions min. typ. (1) max. unit v ih input high level guaranteed logic high for control pins 2 ? ? v v il input low level guaranteed logic low for control pins ? ? 0.8 v i in input leakagecurrent (control inputs) 0v v in v cc ?? 1 a i oz off-state output current (hi-z) 0v v out v cc , switches off ? 0.001 1 a v cc = min., v in = 0v, i on = 8ma ? 5 7 r on switch on resistance v cc = min., v in = 1.7v, i on = 8ma ? 15 20 v cc = 2.3v, v in = 0v, i on = 8ma ? 7 ? v cc = 2.3v, v in = 1.3v, i on = 8ma ? 25 ? v p pass voltage (2) v in = v cc = 3.3v, i out = -5 a 2.5 2.7 2.9 v v in = v cc = 2.5v, i out = -5 a ? 1.8 ? dc electrical characteristics over operating range following conditions apply unless otherwise specified: industrial: t a = ?40c to +85c, v cc = 3.3v 0.3v notes: 1. typical values are at v cc = 3.3v, t a = 25c. 2. pass voltage is guaranteed but not production tested. power supply characteristics symbol parameter test conditions (1) max. unit i ccq quiescent power supply current v cc = max., v in = gnd or vcc, f = 0 12 a i cc power supply current per control input high (2) v cc = max., v in = 3v or vcc, f = 0 50 a i ccd dynamic power supply current per mhz (3) v cc = max., a and b pins open 0.15 ma/mhz control inputs toggling at 50% duty cycle notes: 1. for conditions shown as min. or max., use the appropriate values specified under dc electrical characteristics. 2. per tll driven input (v in = 3.4v, control inputs only). a and b pins do not contribute to icc. 3. this current applies to the control inputs only and represents the current required to switch internal capacitance at the spe cified frequency. the a and b inputs generate no significant ac or dc currents as they transition. this parameter is guaranteed but not production tested.
4 industrial temperature range idtqs34xv245 3.3v high speed 32-bit multiwidth bus switch 14 0.5 11.5 2 2.5 v in - (volts) r o n - ( o h m s ) 12 10 8 6 4 2 0 0. 16 switching characteristics over operating range t a = -40c to +85c, v cc = 3.3v 0.3v; c load = 50pf, r load = 500 unless otherwise noted. symbol parameter min. (1) typ. max. unit t plh data propagation delay (2,3) ? ? 0.25 ns t phl an to/from bn t pzl switch turn-on delay 0.5 ? 6.5 ns t pzh oen to an/bn t plz switch turn-off delay (2) 0.5 ? 4 ns t phz oen to an/bn notes: 1. minimums are guaranteed but not production tested. 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 capacit ance. the time constant for the switch alone is of the order of 0.25ns for c l = 30pf. since this time constant is much smaller than the rise and fall times of typical driving signals, it adds very littl e 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 si de of the switch and its interaction with the load on the driven side. typical on resistance vs v in at v cc = 3.3v
5 idtqs34xv245 3.3v high speed 32-bit multiwidth bus switch industrial temperature range 250 200 150 100 50 0 0 0.5 1 1.5 2 v out (v olts) i o s - ( m a ) -250 -200 -150 -100 -50 1 234 v out (v olts) i o s - ( m a ) -300 3 2.5 2 1.5 2.2 2.4 2.7 3 3.3 3.6 v cc ( v ) v o u t - ( v o l t s ) v out = 2.5v @ v cc = 3.3v v out = 1.8v @ v cc = 2.5v output vi characteristics outputs low characteristic outputs high characteristic pass voltage vs v cc
6 industrial temperature range idtqs34xv245 3.3v high speed 32-bit multiwidth bus switch qs34xv245 2.5v 2.5v 3.3v 2.5v 3.3v qs34xv245 1.8v 1.8v 2.5v 1.8v 2.5v v in 2.5v v out 3.3v supply 0v 3.3v switch output switch input v in 1.8v 2.5v supply 0v 2.5v v out switch out put switch input 2.5v to 1.8v voltage translation 3.3v to 2.5v voltage translation
7 idtqs34xv245 3.3v high speed 32-bit multiwidth bus switch industrial temperature range idtqs xxxxx xx x package process device type blank 34xv245 industrial (-40c to +85c) 3.3v high speed 32-bit multiwidth bus switch q3 80-pin millipaq ordering information 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
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