1 industrial temperature range idtqs3vh2245 3.3v 8-bit bus switch for hot swap applications august 2002 2002 integrated device technology, inc. dsc-5591/2 c industrial temperature range description: the qs3vh2245 hotswitch 8-bit bus switch is specially designed for a hot- swapping environment. the qs3vh2245, with 25 ? on resistance and 1.25ns propagation delay, is ideal for line matching and low noise environments. 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 off and on states, the switches are 5v-tolerant. in the off state, the switches offer very high impedence at the terminals. the combination of small propagation delay, high off impedance, and over-voltage tolerance makes the qs3vh2245 ideal for high performance communication applications. the qs3vh2245 is characterized for operation from -40 c to +85 c. the idt logo is a registered trademark of integrated device technology, inc. applications: ? pci/compact pci 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 ? no dc path to v cc or gnd ? 5v tolerant in off and on state ? 5v tolerant i/os ? bidirectional dataflow with near-zero delay: no added ground bounce ? flat r on characteristics from 0 - 5v ? rail-to-rail switching 0 - 5v ? excellent r on matching between channels ?v cc operation: 2.3v to 3.6v ? maximum operating frequency for data - 150mhz ? lvttl-compatible control inputs ? undershoot clamp diodes on all switch and control inputs ? low i/o capacitance, 4pf typical ?25 ? ? ? ? ? resistors for low noise and line matching ? available in qsop and soic packages idtqs3vh2245 quickswitch ? products 3.3v 8-bit bus switch for hot swap applications (hot switch ? ) functional block diagram 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
2 industrial temperature range idtqs3vh2245 3.3v 8-bit bus switch for hot swap applications 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 v out dc output current 120 ma p max maximum power dissipation 0.5 w 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 capacitance (t a = +25c, f = 1mhz, v in = 0v, v out = 0v) note: 1. h = high voltage level l = low voltage level oe function h disconnected l an = bn function table (1) note: 1. this parameter is guaranteed but not production tested. pin names description oe output enable an data i/os bn data i/os pin description qsop/ soic 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 idtqs3vh2245 3.3v 8-bit bus switch for hot swap applications typical on resistance vs v in at v cc = 3.3v r on (ohms) v in (volts) symbol parameter test conditions min. typ. (1) max. unit v ih input high voltage guaranteed logic high for control inputs 2 ? ? v v il input low voltage guaranteed logic low for control inputs ? ? 0.8 v i in input leakage current 0v oe v cc ??1a i oz off-state current (hi-z) 0v a, b v cc , switches off ? ? 1 a r on switch on resistance v cc = min, v in = 0v, i on = 30ma 20 27 40 ? v cc = min, v in = 2.4v, i on = 15ma 20 28 42 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. 35 12 34 5 30 25 20 15 10 5 0 0 40 0.5 1.5 2.5 3.5 4.5
4 industrial temperature range idtqs3vh2245 3.3v 8-bit bus switch for hot swap applications notes: 1. for conditions shown as min. or max., use the appropriate values specified under dc electrical characteristics. 2. per lvttl-driven-control-input. 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) max. unit i ccq quiescent power supply current v cc = max., v in = gnd or v cc , f = 0 4 ma ? i cc power supply current (2,3) per input high v cc = 3.6v, v in = 3v, f = 0 per control input 30 a i ccd dynamic power supply current per mhz (4) v cc = 3.6v, a and b pins open, per control input toggling @ 50% duty cycle 0.25 ma/mhz 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 . (3) typ. max. unit t plh data propagation delay (1,2) ?? 1.25 ns t phl an to/from bn t pzl switch turn-on delay 0.5 ? 10 ns t pzh oe to an/bn t plz switch turn-off delay (1) 0.5 ? 9ns t phz oe to an/bn f s operating frequency - data (1,4) ?? 150 (6) mhz oe = low f oe operating frequency - enable, select (1,5) ?? 1 mhz notes: 1. this parameter is 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 1.25ns 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. 3. minimums are guaranteed but not production tested. 4. maximum frequency for bidirectional data flow. 5. maximum toggle frequency for oe control input. 6. measured at c load = 30pf.
5 industrial temperature range idtqs3vh2245 3.3v 8-bit bus switch for hot swap applications 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 pci/compact pci 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: pci / compact pci
6 industrial temperature range idtqs3vh2245 3.3v 8-bit bus switch for hot swap applications ordering information idtqs xxxxx xx package device type 3vh2245 3.3v 8-bit bus switch for hot swap aplications so q small outline ic quarter size 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
|
