1 idtqs34x245 high-speed cmos quickswitch 32-bit multiwidth bus switches industrial temperature range april 2000 2000 integrated device technology, inc. dsc-5481/4 c industrial temperature range functional block diagram the idt logo is a registered trademark of integrated device technology, inc. features: ? enhanced n channel fet with no inherent diode to vcc ? bidirectional switches connect inputs to outputs ? zero propagation delay, zero ground bounce ? qs34x245 is 32-bit version of qs3245 ? flow-through pinout for easy layout ? undershoot clamp diodes on all switch and control inputs ? ttl-compatible control inputs ? available in 80-pin millipaq? package applications: ? hot-swapping, hot-docking ? voltage translation (5v to 3.3v) ? bus switching and isolation ? power conservation ? logic replacement (data processing) ? capacitance isolation ? clock gating idtqs34x245 quickswitch ? products high-speed cmos quickswitch 32-bit multiwidth? bus switches description: the qs34x245 is a member of the multiwidth tm family of quickswitch devices and provides a set of 32 high-speed cmos compatible bus switches in a flow-through pinout. this device is available in the millipaq package, the world's first small outline 32-bit solution. the low on-resistance of the qs34x245 allows inputs to be connected to outputs without adding propa- gation delay and without generating additional ground bounce noise. when output enable ( oen ) is low, the switches are turned on, connecting bus a to bus b. when oen is high, the switches are turned off. this device is ideally suited for 32/64 bit applications where board space is at a premium. quickswitch devices provide speeds an order of magnitude faster than conventional logic devices. the qs34x245 is characterized for operation at -40c to +85c. b 0 oe 1 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 a7 b 8 oe 2 a 8 b 9 a 9 b 10 a 10 b 11 a 11 b 12 a 12 b 13 a 13 b 14 a 14 b 15 a 15 b 16 oe 3 a 16 b 17 a 17 b 18 a 18 b 19 a 19 b 20 a 20 b 21 a 21 b 22 a 22 b 23 a 23 b 24 oe 4 a 24 b 25 a 25 b 26 a 26 b 27 a 27 b 28 a 28 b 29 a 29 b 30 a 30 b 31 a 31
2 industrial temperature range idtqs34x245 high-speed cmos quickswitch 32-bit multiwidth bus switches pin configuration 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 3 4 pf quickswitch channels (switch off) 7 8 pf symbol description max unit v term (2) supply voltage to ground ?0.5 to +7 v v term (3) dc switch voltage vs ?0.5 to +7 v v term (3) dc input voltage v in ?0.5 to +7 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 =70c) 1.4 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. millipaq top view note: 1. h = high voltage level l = low voltage level function table (1) oen function h disconnected l an = bn pin description pin names description oen output enable an data i/os bn data i/os 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 nc a0 a1 a2 a3 a4 a5 a6 a7 gnd nc a8 a9 a10 a11 a12 a13 a14 a15 gnd nc a16 a17 a18 a19 a20 a21 a22 a23 gnd nc a24 a25 a26 a27 a28 a29 a30 a31 gnd b16 b17 b18 b19 b20 b21 b22 b23 b24 b25 b26 b27 b28 b29 b30 b31 vcc oe1 b0 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 vcc oe2 vcc oe3 vcc oe4
3 idtqs34x245 high-speed cmos quickswitch 32-bit multiwidth bus switches industrial temperature range r on (ohms) v in (volts) typical on resistance vs v in at v cc = 5v 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 ?? 1a i oz off-state current (hi-z) 0v v out v cc , switches off ? ? 1a r on switch on resistance v cc = min., v in = 0v, i on = 30ma ? 5 7 v cc = min., v in = 2.4v, i on =15ma ? 10 15 v p pass voltage (2) v in = v cc = 5v, i out = -5 a 3.7 4 4.2 v dc electrical characteristics over operating range following conditions apply unless otherwise specified: industrial: t a = ?40c to +85c, v cc = 5.0v 5% notes: 1. typical values are at v cc = 5.0v, t a = 25c. 2. pass voltage is guaranteed but not production tested. 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 industrial temperature range idtqs34x245 high-speed cmos quickswitch 32-bit multiwidth bus switches 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 = 3.4v, f = 0 1.5 ma i ccd dynamic power supply current per mhz (3) v cc = max., a and b pins open 0.25 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. switching characteristics over operating range t a = -40c to +85c, v cc = 5.0v 5%; c load = 50pf, r load = 500 unless otherwise noted. symbol parameter min. (1) typ. max. unit t plh data propagation delay (1,2) ? ? 0.25 ns t phl an to/from bn t pzl switch turn-on delay 0.5 ? 5.6 ns t pzh oe to an/bn t plz switch turn-off delay (1) 0.5 ? 5.2 ns t phz oe to an/bn notes: 1. minimums are guaranteed but not production tested. 2. 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 0.25ns for c l = 50pf. 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.
5 idtqs34x245 high-speed cmos quickswitch 32-bit multiwidth bus switches industrial temperature range ordering information idtqs xxxxxx xx package device type blank industrial (-40c to +85c) 80-pin millipaq 80-pin millipaq - green q3 q3g 34x245 high-speed cmos quickswitch 32-bit multiwidth bus switches x process 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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