1 idtqs34xs257 high-speed cmos synchroswitch 32:16 mux/demux industrial temperature range june 2006 2006 integrated device technology, inc. dsc-5578/3 c idtqs34xs257 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 signal flow ? flow-through pinout ? zero propagation delay, zero ground bounce ? 16 banks of 2:1 mux/demux ? port select synchronous to the clock ? clock enable and asynchronous enable ? undershoot clamp diodes on all switch and control inputs ? asynchronous sel option ? break-before-make feature ? bus-hold eliminates floating bus lines and reduces static power consumption ? available in 80-pin millipaq package applications: ? memory interleaving quickswitch ? products high-speed cmos synchroswitch? 32:16 mux/demux description: the qs34xs257 is a high-speed cmos quad 32:16 multiplexer/ demultiplexer. it is organized as four independent quad 2:1 mux/demux blocks. port selection and connection, controlled by sel signals, can be either asynchronous or synchronous. in the synchronous mode, the a or b port to y port connection is updated on the rising edge of the input clock clk. once the port-to-port connection is made, data flow can be bi- directional with a typical 250ps propagation delay through the switch. clock enable, overriding asynchronous enable, and asynchronous select con- trols provide additional design flexibility. synchronous controls ease timing constraints in many high speed data mux/demux applications, such as bank interleaving. the qs34xs257 is available in the space-saving, 80-pin dual-in-line millipaq package. the qs34xs257 is characterized for operation at -40c to +85c. seln clkn clkenn oen syncn yn 0 yn 1 yn 2 yn 3 an 0 bn 0 an 1 an 2 an 3 bn 1 bn 2 bn 3 control logic note: 1. one of four blocks shown.
2 industrial temperature range idtqs34xs257 high-speed cmos synchroswitch 32:16 mux/demux 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 4 5 pf quickswitch channels demux 5 7 pf (switch off) mux 7 9 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) 1.16 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 (q3) top view pin description pin names i/o description an 0 - an 3 i/o demux port a bn 0 - bn 3 i/o demux port b yn 0 - yn 3 i/o mux port y seln i select input clkn i clock clkenn i clock enable oen i output enable syncn i synchronous selection enable nc a 00 a 01 a 02 a 03 b 00 b 01 b 02 b 03 gnd nc a 10 a 11 a 12 a 13 b 10 b 11 b 12 b 13 nc a 20 a 21 a 22 a 23 b 20 b 21 b 22 b 23 gnd nc a 30 a 31 a 32 a 33 b 30 b 31 b 32 b 33 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 oe 0 sel 0 y 00 y 01 y 02 y 03 clken 0 clk 0 sync 0 vcc oe 1 sel 1 y 10 y 11 y 12 y 13 clken 1 clk 1 sync 1 vcc oe 2 sel 2 y 20 y 21 y 22 y 23 clken 2 clk 2 sync 2 vcc oe 3 sel 3 y 30 y 31 y 32 y 33 clken 3 clk 3 sync 3
3 idtqs34xs257 high-speed cmos synchroswitch 32:16 mux/demux industrial temperature range 1 2:1 mux 0 seln clkenn clkn syncn oen 0 2:1 mux 1 dq to port b switches to port a switches control logic (1) note: 1. one of four blocks. function table (1) control inputs port status sync oen clkn clkenn seln yn 0 yn 1 yn 2 yn 3 function ll llan 0 an 1 an 2 an 3 select port a ll lhbn 0 bn 1 bn 2 bn 3 select port b lh l x no change in mux connection switch off (2) ll h x no change in mux connection hold previous mux connection (3) (switch on) lh h x no change in mux connection switch off (4) hl x x l an 0 an 1 an 2 an 3 select port a hl x x h bn 0 bn 1 bn 2 bn 3 select port b h h x x x no change in mux connection hold previous data (switch off) notes: 1. h = high voltage level l = low voltage level x = don?t care = low-to-high transition 2. mux switches are turned off. the port connection can be changed by the sel input. 3. the contents of the ?mux select register? are unchanged and the previous mux connection is unchanged. the output (mux port) data state will depend on the present data state of the input (demux port). 4. the contents of the ?mux select register? are unchanged.
4 industrial temperature range idtqs34xs257 high-speed cmos synchroswitch 32:16 mux/demux 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 ? 0.1 1a r on switch on resistance (2,3) v cc = min., v in = 0v, i on = 30ma ? 7 9 v cc = min., v in = 2.4v, i on =15ma ? 10 13 dc electrical characteristics over operating range following conditions apply unless otherwise specified: industrial: t a = ?40c to +85c, v cc = 5.0v 10% notes: 1. typical values are at v cc = 5.0v, t a = 25c. 2. max value of r on is guaranteed but not production tested. 3. measured by voltage drop between a/b and y pin at indicated current through the switch. typical on resistance vs v in at v cc = 5v r on (ohms) v in (volts) 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
5 idtqs34xs257 high-speed cmos synchroswitch 32:16 mux/demux industrial temperature range power supply characteristics symbol parameter test conditions (1) max. unit i ccq quiescent power supply current v cc = max., v ctrl = gnd or vcc, f = 0 12 ma 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/b and y pins open 0.25 ma/mhz control inputs toggling at 50% duty cycle switching characteristics over operating range t a = -40c to +85c, v cc = 5.0v 10%; 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 a/b to y, y to a/b t sec clock enable to clock setup time 3 ? ? ns t hec clock enable to clock hold time 0 ? ? ns t cso clock to a, b switch turn-on delay 0.5 ? 7 ns t aso asynchronous select to a, b switch turn-on delay 0.5 ? 7 ns t w clock pulse width high 3 ? ? ns t scs clock to sel setup time 3 ? ? ns t hcs clock to sel hold time 0 ? ? ns t pzl asynchronous enable to switch turn-on delay 1.5 ? 5.2 ns t pzh t plz asynchronous enable to switch turn-off delay (2) 1.5 ? 4.8 ns t phz 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/b 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 a/b and y inputs generate no significant ac or dc currents as they transition. this parameter is guaranteed but not production tested. 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 0.25ns 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.
6 industrial temperature range idtqs34xs257 high-speed cmos synchroswitch 32:16 mux/demux timing waveforms - synchronous mode, demux function sync clken clk sel oe port y port a port b hold previous data, data 1 hold previous data, data 2 data 1 data 2 invalid data data 1 data 0 invalid data t sec t hec t scs t hcs t scs t hcs t plh, t phl t cso t plh, t phl t cso data 1 data 2 data 0
7 idtqs34xs257 high-speed cmos synchroswitch 32:16 mux/demux industrial temperature range timing waveforms - synchronous mode, mux function sync clken clk sel0, sel1 port a port d port y data1 data2 invalid data data3 data4 t sec t hec t scs t hcs t scs t hcs data1 data2 invalid data data3 data4 t cso t plh, t phl t cso t plh, t phl
8 industrial temperature range idtqs34xs257 high-speed cmos synchroswitch 32:16 mux/demux timing waveforms - asynchronous mode, mux function sync sel oe port a port b port y invalid data data1 data2 invalid data data3 invalid data data1 data2 data3 data3 t plh, t phl t plh, t phl t aso t plz, t phz t pzl, t pzh
9 idtqs34xs257 high-speed cmos synchroswitch 32:16 mux/demux industrial temperature range ordering information idtqs xxxxx xx package device type blank industrial (-40c to +85c) 150 mil millipaq 150 mil millipaq - green q3 q3g 34xs257 high speed cmos synchroswitch 32:16 mux/demux 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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