________________________________________________________________________ http://www.union-ic.com rev.01 aug.2008 1/10 UM3257 low-voltage dual spdt analog switch UM3257 dfn12 3.01.6 general description the UM3257 is dual spdt analog switch fabricated with silicon gate cmos technology. it achieves very low propagation delay and r ds(on) resistances while maintaining cmos low power dissipation. these make it ideal for porta ble and battery power applications. the switch conducts signals within power rails equally well in both directions when on, and blocks up to the power supply level when off. break-before-make is guaranteed. the select pin has over-voltage protec tion that allows voltages above v cc , up to 6.5v to be present on the pin without damage or disruption of operation of the part, regardless of the operating voltage. the UM3257 can maintain low power consumpti on for rail-to-rail signaling as long as the control signal input is held at a level that is greater than v ih minimum and less than v il maximum by improving the control circuitry input buffer. so the part can be used in mixed voltage rail environments, especially services the mobile handset applications very well allowing for the direct interface with baseband processor general purpose i/ os, and it is no longer necessary to have the control input equal to v cc to maintain low power consumption the UM3257 is in a 12-pin, rohs compliant, dfn12 package. it measures 3. 0 1.6mm. the leads are spaced at a pitch of 0.5mm and are fi nished with lead free ni-pd. the small package makes it ideal for use in porta ble electronics such as cell phones, digital cameras and pdas. applications features z sample-and-hold circuits z battery powered equipment z audio and video signal routing z communication circuits z lower i cc when the s input is within the required v ih and v il bounds z low on-state resistance (10 ? ) z control inputs are 5v tolerant z low charge injection z excellent on-state resistance matching z low total harmonic distortion (thd) z 1.65v to 5.5v single-supply operation z esd performance: human body model 2kv machine model 200v z dfn12 package z pb-free package pin configurations top view xx: weekly code UM3257 dfn12 3.01.6
________________________________________________________________________ http://www.union-ic.com rev.01 aug.2008 2/10 UM3257 ordering information part number packaging type marking code shipping qty UM3257 dfn12 3.01.6 3257 3000pcs/7 inch tape & reel function table select input function l b0 connected to a h b1 connected to a absolute maximum ratings symbol parameter limit unit v cc supply voltage - 0.5 to + 6.5 v is dc switch input voltage (note 1) - 0.5 to (v cc + 0.5) v in dc in voltage (note 1) - 0.5 to + 6.5 v i ik dc input diode current@ v in 0v -50 i out dc output current 128 i cc / i gnd dc v cc or ground current +100 ma t j junction temperature under bias +150 t stg storage temperature - 65 to +150 t l junction lead temperature (soldering, 10seconds) 260 c ja thermal resistance 350 c/w p d power dissipation @ +85c 180 mw 1: the input and output negative voltage ratings may be exceeded if the input and output diode current ratings are observed. recommended ratings (note2) symbol parameter limit unit v cc supply voltage operating 1.65 to 5.5 v is switch input voltage 0 to v cc v in select input voltage 0 to v cc v out output voltage 0 to v cc v t a operating temperature -55 to +125 c t r , t f input rise and fall time control input vcc=2.3v to 3.6v control input vcc=4.5v to 5.5v 0 to 10 0 to 5.0 ns/v 2: select input must be held high or low, it must not float.
________________________________________________________________________ http://www.union-ic.com rev.01 aug.2008 3/10 UM3257 electrical characteristics limits (?40 to 85 c) symbol parameter test conditions vcc(v) temp min typ max unit dc electrical characteristics analog signal range vcc full 0 v cc v i in input leakage current 0 v i n 5.5v 0 to 5.5 room full 0.05 0.1 1 a i off off state leakage current 0 a, b vcc 1.65 to 5.5 room full 0.05 0.1 1 a v ih input high voltage 1.65 to 1.95 2.3 to 5.5 full 0.75vcc 0.7vcc v v il input low voltage 1.65 to 1.95 2.3 to 5.5 full 0.25vcc 0.3vcc v i cc quiescent supply current v in =vcc or gnd i o =0 5.5 room full 1.0 10 a v in = 0v, i o =30ma v in = 2.4v, i o =-30ma v in = 4.5v, i o =-30ma 4.5 full 3.0 5.0 7.0 6.0 8.0 13 v in = 0v, i o =24ma v in = 3v, i o =-24ma 3.0 full 4.0 10 8.0 19 v in = 0v, i o =8ma v in = 2.3v, i o =-8ma 2.3 full 5.0 13 9.0 24 r on on-resistance (note3) v in = 0v, i o =4ma v in = 1.65v, i o =-4ma 1.65 full 6.5 17 12 39 ? i a =-30ma , 0 v bn vcc 4.5 full 25 i a =-24ma , 0 v bn vcc 3.0 full 50 i a =-8ma , 0 v bn vcc 2.3 full 100 r range on resistance over signal range (note3,7) i a =-4ma , 0 v bn vcc 1.65 full 300 ? i a =-30ma, v bn = 3.15v 4.5 room 0.15 i a =-24ma, v bn = 2.1v 3.0 room 0.2 i a =-8ma, v bn = 1.6v 2.3 room 0.5 r on on resistance match between channels (note3,4,5) i a =-4ma, v bn = 1.15v 1.65 room 0.5 ? i a =-30ma, 0 v bn vcc 5.0 room 5.0 i a =-24ma, 0 v bn vcc 3.3 room 10 i a =-8ma, 0 v bn vcc 2.5 room 24 r flat on resistance flatness (note3,4,6) i a =-4ma, 0 v bn vcc 1.8 room 110 ? 3: measured by the voltage drop between a and b pins at the i ndicated current through the switch. on resistance is determined b y the lower of the voltages on the two (a or b ports). 4: parameter is characterized but not tested in production. 5: r on = r on (a00bn) ? r on(a11bn) measured at identical v cc , temperature and voltage levels. 6: flatness is defined as the difference between the maximum a nd minimum value of on resistan ce over the specified range of conditions. 7: guaranteed by design.
________________________________________________________________________ http://www.union-ic.com rev.01 aug.2008 4/10 UM3257 electrical characteristics (continued) limits (?40 to 85 c) symbol parameter test conditions vcc(v) temp min typ max unit ac electrical characteristics t phl t plh propagation delay bus to bus (note 9) v i = open 1.65 to1.95 2.3 to 2.7 3.0 to 3.6 4.5 to 5.5 room 1.2 0.8 0.3 ns t pzl t pzh output enable time turn on time (a to bn) v i = 2 v cc for t pzl v i = 0 v for t pzh 1.65 to1.95 2.3 to 2.7 3.0 to 3.6 4.5 to 5.5 full 7.0 3.5 2.5 1.7 32 14 7.6 5.7 ns t plz t phz output disable time turn off time (a port to b port) v i = 2 v cc for t plz v i = 0 v for t phz 1.65 to1.95 2.3 to 2.7 3.0 to 3.6 4.5 to 5.5 full 3.0 2.0 1.5 0.8 28 15 11 8 ns t bbm break before make time (note 8) r l =50 ? , c l =35pf 1.65 to1.95 2.3 to 2.7 3.0 to 3.6 4.5 to 5.5 full 0.5 0.5 0.5 0.5 ns q inj charge injection (note 8) c l = 0.1 nf, v gen = 0 v r gen = 0 ? 5.0 3.3 room 7.0 3.0 pc o irr off isolation (note 10) r l =50 ? , f = 10 mhz 1.65 to 5.5 room -55 db xtalk crosstalk r l =50 ? , f = 10 mhz 1.65 to 5.5 room -54 db bw -3 db bandwidth r l =50 ? 2.5 to 5.5 room 250 mhz thd total harmonic distortion (note8) r l =600 ? 0.5v p-p f=600hz to 20khz 2.5 5.0 room 0.014 0.004 % capacitance c in in pin input capacitance (note11) v cc = 0v 2.3 pf c io-b b port off capacitance (note11) v cc =5.0v 6.5 pf c ioa-on a port capacitance when switch is enabled (note11) v cc =5.0v 18.5 pf 8: guaranteed by design. 9: this parameter is guaranteed by design but not tested. the bus switch contributes no propaga tion delay other than the rc del ay of the on resistance of the switch and the 35 pf load capacitance, when driv en by an ideal voltage source (zero output impedance). 10: off isolation = 20 log 10 [v a /v bn ]. 11: t a = +25, f = 1 mhz, capacitance is char acterized but not tested in production.
________________________________________________________________________ http://www.union-ic.com rev.01 aug.2008 5/10 UM3257 test circuits/timing diagrams
________________________________________________________________________ http://www.union-ic.com rev.01 aug.2008 6/10 UM3257
________________________________________________________________________ http://www.union-ic.com rev.01 aug.2008 7/10 UM3257 typical operating characteristics total harmonic distortion vs frequency r on vs v in vs temperature @ v cc =3.0v r on vs v in vs temperature @ v cc =4.5v on-resistance vs input voltage
________________________________________________________________________ http://www.union-ic.com rev.01 aug.2008 8/10 UM3257 typical operating characteristics (continued) bandwidth vs frequency off-isolation vs frequency phase angle vs frequency
________________________________________________________________________ http://www.union-ic.com rev.01 aug.2008 9/10 UM3257 package information UM3257 dfn12 3.01.6 outline drawing dimensions millimeters inches symbol min max min max a 0.700 0.800 0.028 0.031 a1 0.000 0.050 0.000 0.002 a2 0.153 0.253 0.006 0.010 b 0.180 0.300 0.007 0.012 c 0.300 0.500 0.012 0.020 d 2.900 3.100 0.114 0.122 d1 2.400 2.600 0.094 0.102 e 1.550 1.675 0.061 0.066 e 0.450 0.550 0.018 0.022 l 0.150 0.350 0.006 0.014 land pattern notes: 1. compound dimension: 3.01.6; 2. unit: mm; 3. general tolerance 0.05mm unless other- wise specified; 4. the layout is just for reference. tape and reel orientation
________________________________________________________________________ http://www.union-ic.com rev.01 aug.2008 10/10 UM3257 important notice the information in this document has been ca refully reviewed and is believed to be accurate. nonetheless, this document is subjec t to change without notice. union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contained information, or to notify a person or organization of any update. union rese rves the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. union semiconductor, inc add: 7f, no. 5, bibo road, shanghai 201203 tel: 021-51097928 fax: 021-51026018 website: www.union-ic.com
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