unisonic technologies co., ltd u74cbt3251 cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2015 unisonic technologies co., ltd qw-r502-907.b 1-of-8 fet multiplexer/ demultiplexer ? description the u74cbt3251 is a 1-of-8 high-speed ttl-compatible fet multiplexer / demultiplexer. the low on-state resistance of the switch allows connections to be made with minimal propagation delay. when output enable (oe) is low, the u74cbt3251 is enabled. s0, s1, and s2 select one of the b outputs for the a-input data. ? features * v cc operating range from 4v to 5.5v * bidirectional data flow, with minimal propagation delay * low on-state resistance (r on ) characteristics (r on =5 ? typ.) * low power consumption i cc =3 a (max) ? ordering information ordering number package packing u74cbt3251g-r16-r ssop-16 tape reel U74CBT3251G-P16-R tssop-16 tape reel ? marking ssop-16 tssop-16
u74cbt3251 cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-907.b ? pin configuration ? function table input oe s2 s1 s0 function l l l l a port=b1 port l l l h a port=b2 port l l h l a port=b3 port l l h h a port=b4 port l h l l a port=b5 port l h l h a port=b6 port l h h l a port=b7 port l h h h a port=b8 port h x x x disconnect
u74cbt3251 cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-907.b ? logic diagram s0 sw sw sw sw sw sw sw sw sw a b1 b3 b5 b7 b2 b4 b6 b8 oe s1 s2
u74cbt3251 cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-907.b ? absolute maximum rating (t a =25c, unless otherwise specified) parameter symbol ratings unit supply voltage v cc -0.5 ~ 7 v dc input voltage(see note 2,3) v in -0.5 ~ 7 v control input clamp current i ik -50 ma i in(sw) on-state switch current i out(sw) 128 ma operating temperature t opr -40~+85 c storage temperature t stg -65~+150 c notes: 1. absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. 2. all voltages are with respect to ground 3. the input and output voltage rati ngs may be exceeded if the input and output clamp-current ratings are observed. ? thermal data parameter symbol ratings unit ssop-16 90 junction to ambient tssop-16 ja 110 c/w ? recommended operating conditions parameter symbol min typ max unit supply voltage v cc 4 5.5 v high-level control input voltage v ih 2 5.5 v low-level control input voltage v il 0 0.8 v data input voltage v in 0 5.5 v data output voltage v out 0 5.5 v operating temperature t a -40 85 c ? electrical characteristics (ta=25c, unless otherwise specified) parameter symbol test conditions min typ max unit control input clamp voltage v ik v cc =4.5v, i in = -18ma -1.2 v input leakage current i i(leak) v cc =5.5v, v in =v cc or gnd 1 a quiescent supply current i cc v cc =5.5 v, i in /i out =0 v in =v cc or gnd, switch on or off 3 a additional quiescent supply current ? i cc v cc =5.5v, one input at 3.4v, other inputs at v cc or gnd 2.5 ma control input capacitance c in v in =3v or 0 3.5 pf a port input capacitance 17.5 pf b port input capacitance c io(off) v cc =5v, v in /v out =3v or 0 v in =v cc or gnd, switch off 4 pf v cc =4v, v in =2.4v, i out =-15ma 14 20 ? i out =64ma 5 7 ? v cc =4.5v, v in =0 i out =30ma 5 7 ? on-resistance r on v cc =4.5v, v in =2.4v i out =-15ma 10 15 ?
unisonic technologies co., ltd u74cbt3251 cmos ic www.unisonic.com.tw 5 of 6 copyright ? 2015 unisonic technologies co., ltd qw-r502-907.b ? switching characteristics (c l =50pf, r l =500 ? see test circuit and waveforms) parameter symbol test conditions min typ max unit v cc =4v 0.35 ns from input (a or b) to output (b or a) (note) t pd v cc = 5v0.5v 0.25 ns v cc =4v 6.0 ns from input s to output a t pd(s) v cc = 5v0.5v 2 5.5 ns v cc =4v 6.4 ns from input s to output b v cc = 5v0.5v 1.5 5.6 ns v cc =4v 6.4 ns from input oe to output (a or b) t en v cc = 5v0.5v 1.6 5.8 ns v cc =4v 6.8 ns from input s to output b v cc = 5v0.5v 1.9 6.4 ns v cc =4v 6.0 ns from input oe to output (a or b) t dis v cc = 5v0.5v 2.3 6.2 ns note: the propagation delay is the calculat ed 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).
u74cbt3251 cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-907.b ? test circuit and waveforms test v cc v i t r / t f v ? v ext c l r l 4v v cc or gnd 2.5ns open 50pf 500 ? t plh /t phl 5v0.5v v cc or gnd 2.5ns open 50pf 500 ? 4v gnd 2.5ns 0.3v 7v 50pf 500 ? t plz /t pzl 5v0.5v gnd 2.5ns 0.3v 7v 50pf 500 ? 4v v cc 2.5ns 0.3v open 50pf 500 ? t phz /t pzh 5v0.5v v cc 2.5ns 0.3v open 50pf 500 ? propagation delay times enable and disable times notes: 1. c l includes probe and jig capacitance. 2. all input pulses are supplied by generator s having the following characteristics: prr 10mhz, z o =50 ? , tr 2.5ns, tf 2.5 ns. 3. the outputs are measured one at a ti me with one transition per measurement. 4. t plz and t phz are the same as tdis. 5. t pzl and t pzh are the same as ten. 6. t plh and t phl are the same as tpd(s). 7. all parameters and waveforms are not applicable to all devices. utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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