1 idtqs3r862 high-speed cmos 10-bit low resistance bus switch industrial temperature range november 1999 1999 integrated device technology, inc. dsc-5541/1 c industrial temperature range the idt logo is a registered trademark of integrated device technology, inc. idtqs3r862 functional block diagram features: ? enhanced n channel fet with no inherent diode to vcc ? 2.5 ? ? ? ? ? bidirectional switches connect inputs to outputs ? zero propagation delay, zero ground bounce ? undershoot clamp diodes on all switch and control inputs ? active high and low enable controls ? bidirectional signal flow ? available in soic and qsop packages applications: ? hot-swapping, hot-docking (low resistance for pci and compact pci applications) ? voltage translation (5v to 3.3v) ? power conservation ? capacitance reduction and isloation ? applications requiring low r on resistance and active high enabling ? bus isolation ? clock gating quickswitch ? products high-speed cmos 10-bit low resistance bus switch with active high and low enables description: the qs3r862 provides a set of ten high-speed cmos ttl-compatible bus switches. the very low on resistance (2.5 ? ) of the qs3r862 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. the switches are controlled by active low enable ( be ) and active high enable (be) controls. the qs3r862 with 2.5 ? r on resistance is ideal for switching digital buses as well as for hot-plugging, hot-swapping, and hot-docking applica- tions. the low r on resistance of the qs3r862 makes it ideal for pci, compact pci, and vme hot-plugging applications. the qs3r862 is characterized for operation at -40c to +85c. a 0 be b 0 a 9 b 9 be
2 industrial temperature range idtqs3r862 high-speed cmos 10-bit low resistance bus switch pin configuration symbol description max unit v term (2) supply voltage to ground ?0.5 to +7 v v term (3) dc switch voltage v s ?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 0.5 w t stg storage temperature ?65 to +150 c absolute maximum ratings (1) note: 1. h = high voltage level l = low voltage level z = high-impedance be be a 0 - a 9 function l l z disconnect l h z disconnect hlb 0 - b 9 connect h h z disconnect function table (1) pins typ. max. (1) unit control inputs 3 4 pf quickswitch channels (switch off) 5 6 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 i/o description a 0 - a 9 i/o bus a b 0 - b 9 i/o bus b be i active low bus enable be i active high bus enable pin description 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 . soic/ qsop top view gnd b 9 a 9 a 8 a 6 1 2 3 4 5 6 7 8 9 10 12 13 14 15 16 17 18 19 20 21 22 23 24 11 vcc b 8 b 7 a 7 b 6 b 5 a 5 b 0 a 0 a 1 b 1 b 2 a 2 a 3 b 3 b 4 a 4 be be
3 idtqs3r862 high-speed cmos 10-bit low resistance bus switch industrial temperature range typical on resistance vs v in at v cc = 5v 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 pins 2 ? ? v v il input low voltage guaranteed logic low for control pins ? ? 0.8 v i in input leakage current (control inputs) 0v v in v cc ? 0.01 1 a i oz off-state current (hi-z) 0v v out v cc , switches off ? 0.01 1 a r on switch on resistance (2) v cc = min., v in = 0v, i on = 30ma ? 2.5 5 ? v cc = min., v in = 2.4v, i on = 15ma ? 4 8.5 v p pass voltage (3) v in = v cc = 5v, i out = -5 a 3.7 4 4.3 v dc electrical characteristics over operating range following conditions apply unless otherwise specified: industrial: t a = ?40c to +85c, v cc = 5v 10% notes: 1. typical values are at v cc = 5v and t a = 25c. 2. max value of r on is guaranteed but not production tested. 3. pass voltage is guaranteed but not production tested. 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 2 4 6 8 10 12 14 16
4 industrial temperature range idtqs3r862 high-speed cmos 10-bit low resistance bus switch notes: 1. for conditions shown as min. or max., use the appropriate values specified under dc electrical characteristics. 2. typical values are at v cc = 5v and t a = 25c. 3. per ttl-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. power supply characteristics symbol parameter test conditions (1) typ. (2) max. unit i ccq quiescent power supply current v cc = max., v in = gnd or v cc , f = 0 0.2 3 a ? i cc power supply current per input high (3) v cc = max., v in = 3.4v, f = 0 ? 2.5 ma i ccd dynamic power supply current per mhz (4) v cc = max., a and b pins open, ? 0.25 ma/mhz be or be input toggling @ 50% duty cycle switching characteristics over operating range t a = -40c to +85c, v cc = 5v 10% c load = 50pf, r load = 500 ? unless otherwise noted. symbol parameter min . (1) typ. max. unit t plh data propagation delay (2) ?? 0.12 (3) ns t phl a to b, b to a t pzl switch turn-on delay 1.5 ? 5.6 ns t pzh be or be to a or b t plz switch turn-off delay (2) 1.5 ? 4.5 ns t phz be or be to a or b 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 capac itance. the time constant for the switch alone is of the order of 0.12ns 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.
5 idtqs3r862 high-speed cmos 10-bit low resistance bus switch industrial temperature range ordering information 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 idtqs xxxxx xx package device type blank industrial (-40c to +85c) small outline ic quarter size outline package so q 3r862 high speed cmos 10-bit low resistance bus switch with active high and low enables x process
|
