1 idtqs3251 high-speed cmos quickswitch 8:1 mux/demux industrial temperature range february 2011 2011 integrated device technology, inc. dsc-5754/5 c idtqs3251 industrial temperature range quickswitch ? products high-speed cmos quickswitch 8:1 mux/demux 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 ?5 bidirectional switches connect inputs to outputs ? pin compatible with the 74f251, 74fct251, and 74fct251t ? zero propagation delay, zero ground bounce ? undershoot clamp diodes on all switch and control inputs ? ttl-compatible control inputs ? available in soic and qsop packages applications: ? logic replacement ? video, audio, graphics switching, muxing ? hot-swapping, hot-docking ? voltage translation (5v to 3.3v) description: the qs3251 is a high-speed cmos ttl-compatible 8:1 multiplexer/ demultiplexer. the qs3251 has 3-state outputs. the qs3251 is a function and pinout compatible version of the 74f251, 74fct251 and the 74als/ as/ls251 8:1 multiplexers. the low on resistance of the qs3251 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. mux/demux devices provide an order of magnitude faster speed than equivalent logic devices. the qs3251 is characterized for operation at -40c to +85c. s 0 y i 0 i 1 i 2 i 3 i 4 i 5 i 6 i 7 s 1 s 2 e
2 industrial temperature range idtqs3251 high-speed cmos quickswitch 8:1 mux/demux pin configuration soic/ qsop top view function table (1) pin description pin names i/o description i 0 - i 7 i data inputs s 0 - s 2 i select inputs e i enable input y o data output 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 = 85c) 0.5 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. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 i 3 i 2 i 1 i 0 y gnd v cc s 0 nc e s 1 s 2 i 4 i 5 i 6 i 7 select e s 2 s 1 s 0 y function h x x x hi-z disable ll l l i 0 s 2 - s 0 = 0 ll l h i 1 s 2 - s 0 = 1 ll h l i 2 s 2 - s 0 = 2 ll h h i 3 s 2 - s 0 = 3 lh l l i 4 s 2 - s 0 = 4 lh l h i 5 s 2 - s 0 = 5 lh h l i 6 s 2 - s 0 = 6 lh h h i 7 s 2 - s 0 = 7 note: 1. h = high voltage level l = low voltage level x = don?t care z = high-impedence pins typ. max. (1) unit control inputs 4 5 pf quickswitch channels demux 5 7 pf (switch off) mux 21 23 capacitance (t a = +25c, f = 1mhz, v in = 0v, v out = 0v) note: 1. this parameter is guaranteed but not production tested.
3 idtqs3251 high-speed cmos quickswitch 8:1 mux/demux industrial temperature range r on (ohms) v in (volts) typical on resistance vs v in at v cc = 5v symbol par ameter 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 ?? 1 a r on switch on resistance (2) 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 (3) 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. r on is guaranteed but not production tested. 3. 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 idtqs3251 high-speed cmos quickswitch 8:1 mux/demux 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 3 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., i and y 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). i and y 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 i and y 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 (2,3) ? ? 0.25 ns t phl ix to y t pzl switch turn-on delay 0.5 ? 6.6 ns t pzh sx to y t pzl switch turn-on delay 0.5 ? 6 ns t pzh e to y t plz switch turn-off delay (2) 0.5 ? 6 ns t phz e to y, sx to y 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 = 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 idtqs3251 high-speed cmos quickswitch 8:1 mux/demux industrial temperature range ordering information qs xxxxx xx package device type small outline ic - green quarter size outline package - green s1g qg 3251 high speed cmos quickswitch 8:1 mux/demux x blank 8 tube or tray tape and reel 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 datasheet document history 02/14/2011 pg. 5 updated the ordering information by removing the "idt" notation, non rohs part and by adding tape and reel information.
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