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features description/ordering information sn74cb3q3251 1-of-8 fet multiplexer/demultiplexer 2.5-v/3.3-v low-voltage high-bandwidth bus switch scds173a ? august 2004 ? revised march 2005 data and control inputs provide undershoot clamp diodes high-bandwidth data path (up to 500 mhz (1) ) low power consumption (i cc = 1 ma typ) equivalent to idtqs3vh251 device v cc operating range from 2.3 v to 3.6 v 5-v tolerant i/os with device powered up or powered down data i/os support 0- to 5-v signaling levels (0.8 v, 1.2 v, 1.5 v, 1.8 v, 2.5 v, 3.3 v, 5 v) low and flat on-state resistance (r on ) characteristics over operating range control inputs can be driven by ttl or (r on = 4 w typ) 5-v/3.3-v cmos outputs rail-to-rail switching on data i/o ports i off supports partial-power-down mode operation ? 0- to 5-v switching with 3.3-v v cc latch-up performance exceeds 100 ma per ? 0- to 3.3-v switching with 2.5-v v cc jesd 78, class ii bidirectional data flow with near-zero esd performance tested per jesd 22 propagation delay ? 2000-v human-body model (a114-b, low input/output capacitance minimizes class ii) loading and signal distortion (c io(off) = 3.5 pf typ) ? 1000-v charged-device model (c101) fast switching frequency supports both digital and analog (f oe or f s = 20 mhz max) applications: pci interface, differential signal interface, memory interleaving, bus isolation, (1) for additional information regarding the performance characteristics of the cb3q family, refer to the ti application low-distortion signal gating report, cbt-c, cb3t, and cb3q signal-switch families, literature number scda008. the sn74cb3q3251 is a high-bandwidth fet bus switch utilizing a charge pump to elevate the gate voltage of the pass transistor, providing a low and flat on-state resistance (r on ). the low and flat on-state resistance allows for minimal propagation delay and supports rail-to-rail switching on the data input/output (i/o) ports. the device also features low data i/o capacitance to minimize capacitive loading and signal distortion on the data bus. specifically designed to support high-bandwidth applications, the sn74cb3q3251 provides an optimized interface solution ideally suited for broadband communications, networking, and data-intensive computing systems. please be aware that an important notice concerning availability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. production data information is current as of publication date. copyright ? 2004?2005, texas instruments incorporated products conform to specifications per the terms of the texas instruments standard warranty. production processing does not necessarily include testing of all parameters. www .ti.com 12 3 4 5 6 7 8 1615 14 13 12 1 1 10 9 b4b3 b2 b1 a ncoe gnd v c c b5b6 b7 b8 s0 s1 s2 dbq, dgv , or pw p ackage (t op view) nc - no internal connection rgy p ackage (t op view) 1 16 8 9 23 4 5 6 7 1514 13 12 1 1 10 b5b6 b7 b8 s0 s1 b3b2 b1 a ncoe b4 s2 v gnd cc nc - no internal connection
description/ordering information (continued) sn74cb3q3251 1-of-8 fet multiplexer/demultiplexer 2.5-v/3.3-v low-voltage high-bandwidth bus switch scds173a ? august 2004 ? revised march 2005 the sn74cb3q3251 is a 1-of-8 multiplexer/demultiplexer with a single output-enable ( oe) input. the select (s0, s1, s2) inputs control the data path of the multiplexer/demultiplexer. when oe is low, the multiplexer/demultiplexer is enabled, and the a port is connected to the b port, allowing bidirectional data flow between ports. when oe is high, the multiplexer/demultiplexer is disabled, and a high-impedance state exists between the a and b ports. this device is fully specified for partial-power-down applications using i off . the i off circuitry prevents damaging current backflow through the device when it is powered down. the device has isolation during power off. to ensure the high-impedance state during power up or power down, oe should be tied to v cc through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. ordering information t a package (1) orderable part number top-side marking qfn ? rgy tape and reel sn74cb3q3251rgyr bu251 ssop (qsop) ? dbq tape and reel sn74cb3q3251dbqr bu251 ?40c to 85c tube sn74cb3q3251pw tssop ? pw bu251 tape and reel SN74CB3Q3251PWR tvsop ? dgv tape and reel sn74cb3q3251dgvr bu251 (1) package drawings, standard packing quantities, thermal data, symbolization, and pcb design guidelines are available at www.ti.com/sc/package. function table inputs input/output function a oe s2 s1 s0 l l l l b1 a port = b1 port l l l h b2 a port = b2 port l l h l b3 a port = b3 port l l h h b4 a port = b4 port l h l l b5 a port = b5 port l h l h b6 a port = b6 port l h h l b7 a port = b7 port l h h h b8 a port = b8 port h x x x z disconnect 2 www .ti.com
sn74cb3q3251 1-of-8 fet multiplexer/demultiplexer 2.5-v/3.3-v low-voltage high-bandwidth bus switch scds173a ? august 2004 ? revised march 2005 logic diagram (positive logic) simplified schematic, each fet switch (sw) 3 www .ti.com b5 b1 a s0s1 s2 oe b2b3 b4 b6 b7 b8 sw sw sw sw sw sw sw sw 51 1 109 7 43 2 1 1514 13 12 a en ( 1 ) b (1) en is the internal enable signal applied to the switch. charge pump v c c
absolute maximum ratings (1) recommended operating conditions (1) sn74cb3q3251 1-of-8 fet multiplexer/demultiplexer 2.5-v/3.3-v low-voltage high-bandwidth bus switch scds173a ? august 2004 ? revised march 2005 over operating free-air temperature range (unless otherwise noted) min max unit v cc supply voltage range ?0.5 4.6 v v in control input voltage range (2) (3) ?0.5 7 v v i/o switch i/o voltage range (2) (3) (4) ?0.5 7 v i ik control input clamp current v in < 0 ?50 ma i i/ok i/o port clamp current v i/o < 0 ?50 ma i i/o on-state switch current (5) 64 ma continuous current through v cc or gnd 100 ma dbq package (6) 90 dgv package (6) 120 q ja package thermal impedance c/w pw package (6) 108 rgy package (7) 39 t stg storage temperature range ?65 150 c (1) stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) all voltages are with respect to ground unless otherwise specified. (3) the input and output voltage ratings may be exceeded if the input and output clamp-current ratings are observed. (4) v i and v o are used to denote specific conditions for v i/o . (5) i i and i o are used to denote specific conditions for i i/o . (6) the package thermal impedance is calculated in accordance with jesd 51-7. (7) the package thermal impedance is calculated in accordance with jesd 51-5. min max unit v cc supply voltage 2.3 3.6 v v cc = 2.3 v to 2.7 v 1.7 5.5 v ih high-level control input voltage v v cc = 2.7 v to 3.6 v 2 5.5 v cc = 2.3 v to 2.7 v 0 0.7 v il low-level control input voltage v v cc = 2.7 v to 3.6 v 0 0.8 v i/o data input/output voltage 0 5.5 v t a operating free-air temperature ?40 85 c (1) all unused control inputs of the device must be held at v cc or gnd to ensure proper device operation. refer to the ti application report, implications of slow or floating cmos inputs, literature number scba004. 4 www .ti.com
electrical characteristics (1) switching characteristics sn74cb3q3251 1-of-8 fet multiplexer/demultiplexer 2.5-v/3.3-v low-voltage high-bandwidth bus switch scds173a ? august 2004 ? revised march 2005 over recommended operating free-air temperature range (unless otherwise noted) parameter test conditions min typ (2) max unit v ik v cc = 3.6 v, i i = ?18 ma ?1.8 v i in control inputs v cc = 3.6 v, v in = 0 to 5.5 v 1 m a v o = 0 to 5.5 v, switch off, i oz (3) v cc = 3.6 v, 1 m a v i = 0, v in = v cc or gnd i off v cc = 0, v o = 0 to 5.5 v, v i = 0 1 m a i i/o = 0, i cc v cc = 3.6 v, v in = v cc or gnd 1 4 ma switch on or off, d i cc (4) control inputs v cc = 3.6 v, one input at 3 v, other inputs at v cc or gnd 30 m a per control control input switching at ma/ i ccd (5) v cc = 3.6 v, a and b ports open, 0.03 0.1 input 50% duty cycle mhz c in control inputs v cc = 3.3 v, v in = 5.5 v, 3.3 v, or 0 2.5 4.5 pf switch off, a port v cc = 3.3 v, v i/o = 5.5 v, 3.3 v, or 0 19.5 25 v in = v cc or gnd, c io(off) pf switch off, b port v cc = 3.3 v, v i/o = 5.5 v, 3.3 v, or 0 3.5 4.5 v in = v cc or gnd, switch on, c io(on) v cc = 3.3 v, v i/o = 5.5 v, 3.3 v, or 0 15 19 pf v in = v cc or gnd, v i = 0, i o = 30 ma 4 10 v cc = 2.3 v, typ at v cc = 2.5 v v i = 1.7 v, i o = ?15 ma 4.5 11 r on (6) w v i = 0, i o = 30 ma 3.5 8 v cc = 3 v v i = 2.4 v, i o = ?15 ma 4 10 (1) v in and i in refer to control inputs. v i , v o , i i , and i o refer to data pins. (2) all typical values are at v cc = 3.3 v (unless otherwise noted), t a = 25c. (3) for i/o ports, the parameter i oz includes the input leakage current. (4) this is the increase in supply current for each input that is at the specified ttl voltage level, rather than v cc or gnd. (5) this parameter specifies the dynamic power-supply current associated with the operating frequency of a single control input (see figure 2 ). (6) measured by the voltage drop between the a and b terminals at the indicated current through the switch. on-state resistance is determined by the lower of the voltages of the two (a or b) terminals. over recommended operating free-air temperature range (unless otherwise noted) (see figure 3 ) v cc = 2.5 v v cc = 3.3 v from to 0.2 v 0.3 v parameter unit (input) (output) min max min max f oe or f s (1) oe or s a or b 10 20 mhz t pd (2) a or b b or a 0.12 0.18 ns t pd(s) s a 1.5 6.7 1.5 5.9 ns s b 1.5 6.7 1.5 5.9 t en ns oe a or b 1.5 6.7 1.5 5.9 s b 0.5 6.1 0.5 6.1 t dis ns oe a or b 0.5 6.1 0.5 6.1 (1) maximum switching frequency for control input (v o > v cc , v i = 5 v, r l 3 1 m w , c l = 0). (2) the propagation delay is the calculated rc time constant of the typical on-state resistance of the switch and the specified load capacitance, when driven by an ideal voltage source (zero output impedance). 5 www .ti.com
sn74cb3q3251 1-of-8 fet multiplexer/demultiplexer 2.5-v/3.3-v low-voltage high-bandwidth bus switch scds173a ? august 2004 ? revised march 2005 figure 1. typical r on vs v i , v cc = 3.3 v and i o = ?15 ma figure 2. typical i cc vs oe or s switching frequency, v cc = 3.3 v 6 www .ti.com 0 2 4 6 8 10 12 14 16 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 v i ? v typical r o n vs v i v c c = 3.3 v t a = 25 c i o = ?15 ma r o n ? on-state resistance ? w oe or s switching frequency ? mhz typical i c c vs control input switching frequency 0 0.5 1 1.5 2 2.5 3 0 5 10 15 20 25 v c c = 3.3 v t a = 25 c a and b ports open s switching oe switching i c c ? ma
parameter measurement information sn74cb3q3251 1-of-8 fet multiplexer/demultiplexer 2.5-v/3.3-v low-voltage high-bandwidth bus switch scds173a ? august 2004 ? revised march 2005 figure 3. test circuit and voltage waveforms 7 www .ti.com v o h v o l c l (see note a) test circuit s1 2 v c c open gnd r l r l t p l h t p h l output w aveform 1 s1 at 2 v c c (see note b) output w aveform 2 s1 at gnd (see note b) t p z l t p z h t p l z t p h z v c c 0 v v o h v o l 0 v v o l + v d v o h ? v d 0 v output control (v i n ) v c c v c c vol t age w a veforms prop aga tion dela y times (t p d ( s ) ) vol t age w a veforms enable and disable times output notes: a. c l includes probe and jig capacitance. b. w aveform 1 is for an output with internal conditions such that the output is low , except when disabled by the output control. w aveform 2 is for an output with internal conditions such that the output is high, except when disabled by the output control. c. all input pulses are supplied by generators having the following characteristics: prr 10 mhz, z o = 50 w , t r 2.5 ns, t f 2.5 ns. d. the outputs are measured one at a time, with one transition per measurement. e. t p l z and t p h z are the same as t d i s . f. t p z l and t p z h are the same as t e n . g. t p l h and t p h l are the same as t p d ( s ) . the tpd propagation delay is the calculated rc time constant of the typical on-state resistance of the switch and the specified load capacitance, when driven by an ideal voltage source (zero output impedance). h. all parameters and waveforms are not applicable to all devices. 50 w v g 1 v c c dut 50 w v i n 50 w v g 2 50 w v i test r l s1 v d c l 2.5 v 0.2 v 3.3 v 0.3 v v c c v i t p h z /t p z h t p l z /t p z l t p d ( s ) 2.5 v 0.2 v 3.3 v 0.3 v 2.5 v 0.2 v 3.3 v 0.3 v openopen 2 v c c 2 v c c gndgnd 500 w 500 w 500 w 500 w 500 w 500 w v c c or gnd v c c or gnd gndgnd v c c v c c 30 pf50 pf 30 pf 50 pf 30 pf 50 pf 0.15 v 0.3 v 0.15 v 0.3 v output control (v i n ) input generator input generator v c c /2 v c c /2 v c c /2 v c c /2 v c c /2 v c c /2 v c c /2 v c c /2 v o
package option addendum www.ti.com 24-apr-2015 addendum-page 1 packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish (6) msl peak temp (3) op temp (c) device marking (4/5) samples sn74cb3q3251dbqr active ssop dbq 16 2500 green (rohs & no sb/br) cu nipdau level-2-260c-1 year -40 to 85 bu251 sn74cb3q3251dgvr active tvsop dgv 16 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim -40 to 85 bu251 sn74cb3q3251pw active tssop pw 16 90 green (rohs & no sb/br) cu nipdau level-1-260c-unlim -40 to 85 bu251 sn74cb3q3251pwg4 active tssop pw 16 90 green (rohs & no sb/br) cu nipdau level-1-260c-unlim -40 to 85 bu251 SN74CB3Q3251PWR active tssop pw 16 2000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim -40 to 85 bu251 sn74cb3q3251rgyr active vqfn rgy 16 3000 green (rohs & no sb/br) cu nipdau level-2-260c-1 year -40 to 85 bz51 (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) eco plan - the planned eco-friendly classification: pb-free (rohs), pb-free (rohs exempt), or green (rohs & no sb/br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. tbd: the pb-free/green conversion plan has not been defined. pb-free (rohs): ti's terms "lead-free" or "pb-free" mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, ti pb-free products are suitable for use in specified lead-free processes. pb-free (rohs exempt): this component has a rohs exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. the component is otherwise considered pb-free (rohs compatible) as defined above. green (rohs & no sb/br): ti defines "green" to mean pb-free (rohs compatible), and free of bromine (br) and antimony (sb) based flame retardants (br or sb do not exceed 0.1% by weight in homogeneous material) (3) msl, peak temp. - the moisture sensitivity level rating according to the jedec industry standard classifications, and peak solder temperature. (4) there may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) multiple device markings will be inside parentheses. only one device marking contained in parentheses and separated by a "~" will appear on a device. if a line is indented then it is a continuation of the previous line and the two combined represent the entire device marking for that device.
package option addendum www.ti.com 24-apr-2015 addendum-page 2 (6) lead/ball finish - orderable devices may have multiple material finish options. finish options are separated by a vertical ruled line. lead/ball finish values may wrap to two lines if the finish value exceeds the maximum column width. important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis.
tape and reel information *all dimensions are nominal device package type package drawing pins spq reel diameter (mm) reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p1 (mm) w (mm) pin1 quadrant sn74cb3q3251dgvr tvsop dgv 16 2000 330.0 12.4 6.8 4.0 1.6 8.0 12.0 q1 SN74CB3Q3251PWR tssop pw 16 2000 330.0 12.4 6.9 5.6 1.6 8.0 12.0 q1 sn74cb3q3251rgyr vqfn rgy 16 3000 330.0 12.4 3.8 4.3 1.5 8.0 12.0 q1 package materials information www.ti.com 14-jul-2012 pack materials-page 1
*all dimensions are nominal device package type package drawing pins spq length (mm) width (mm) height (mm) sn74cb3q3251dgvr tvsop dgv 16 2000 367.0 367.0 35.0 SN74CB3Q3251PWR tssop pw 16 2000 367.0 367.0 35.0 sn74cb3q3251rgyr vqfn rgy 16 3000 367.0 367.0 35.0 package materials information www.ti.com 14-jul-2012 pack materials-page 2

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