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________________________________________________________________________ http://www.union-ic.com rev.03 dec.2013 1/11 UM3212 dual bidirectional i 2 c-bus and smbus voltage-level translator UM3212m8 msop8 UM3212da dfn8 2.11.6 general description the UM3212 is a dual bidirectional i 2 c-bus and smbus voltage-level translator with an enable(en) input, and is operational from 1.0 v to 3.6 v (v ref(1) ) and 1.8 v to 5.5 v(v bias(ref)(2) ). the UM3212 allows bidirectional voltage translati ons between 1.0 v and 5 v without the use of a direction pin. the low on-state resistance (r on ) of the switch allows connections to be made with minimal propagation delay. when en is high, the translator switch is on, and the scl1 and sda1 i/o are connected to the scl2 and sda2 i/ o, respectively, allowing bidirectional data flow between ports. when en is low, the transl ator switch is off, and a high-impedance state exists between ports. the UM3212 is not a bus buffer which provides both level translation and physically isolates the capacitance to either side of the bus when both sides are connected. the UM3212 only isolates both sides when the device is disabled and prov ides voltage level translation when active. the UM3212 can also be used to run two buses, one at 400 khz operating frequency and the other at 100 khz operating frequency. if the two buses ar e operating at different frequencies, the 100 khz bus must be isolated when the 400 khz operatio n of the other bus is required. if the master is running at 400 khz, the maximum system opera ting frequency may be less than 400 khz because of the delays added by the translator. as with the standard i 2 c-bus system, pull-up resistors are required to provide the logic high levels on the translator?s bus. the UM3212 has a st andard open-collector configuration of the i 2 c-bus. the size of these pull-up resistors depends on the system, but each side of the translator must have a pull-up resistor. the device is desi gned to work with standard-mode, fast-mode and fast-mode plus i 2 c-bus devices in addition to smbus devices. the maximum frequency is dependent on the rc time constant, but generally supports > 2 mhz. when the sda1 or sda2 port is low, the cl amp is in the on-state and a low resistance connection exists between the sda1 and sda2 ports. assuming the higher voltage is on the sda2 port when the sda2 port is high, the volta ge on the sda1 port is limited to the voltage set by vref1. when the sda1 port is high, the sda2 port is pulled to the drain pull-up supply voltage (v pu(d) ) by the pull-up resistors. this functiona lity allows a seamless translation between higher and lower voltages selected by the user without the need for directional control. the scl1/scl2 channel also functions as the sda1/sda2 channel. all channels have the same electrical character istics and there is minimal deviation from one output to another in voltage or propagation delay. this is a benefit over discrete transistor voltage translation solutions, since the fabrication of the switch is symmetrical. the translator provides excellent esd protection to lower voltage devices, and at the same time protects less esd-resistant devices. applications ? i 2 c, smbus and spi level translation ? low-voltage asic level translation ? smart card readers ? cell-phone cradles ? portable pos systems ? portable communication devices ? low-cost serial interfaces ? cell-phones ? gps ? telecommunications equipment
________________________________________________________________________ http://www.union-ic.com rev.03 dec.2013 2/11 UM3212 features ? 2-bit bidirectional translator for sda and scl lines in mixed-mode i 2 c-bus applications ? standard-mode, fast-mode, fast-mode plus and hs-mode i 2 c-bus and smbus compatible ? less than 3.5ns maximum propagation delay to accommodate standard-mode and fast-mode i 2 c-bus devices and multiple masters ? allows voltage level translation between: 1.) 1.0v vref1 and 1.8v, 2.5v, 3.3v or 5v vref2 2.) 1.2v vref1 and 1.8v, 2.5v, 3.3v or 5v vref2 3.) 1.8v vref1 and 3.3v or 5v vref2 4.) 2.5v vref1 and 5v vref2 5.) 3.3v vref1 and 5v vref2 ? open-drain i 2 c-bus i/o ports (scl1, sda1, scl2 and sda2) ? provides bidirectional voltage translation with no direction pin ? low 3.0 ? on-state connection between input and output ports provides less signal distortion ? 5v tolerant i 2 c-bus i/o ports to support mixed-mode signal operation ? high-impedance scl1, sda1, scl2 and sda2 pins for en = low ? lock-up free operation ? flow through pinout for ease of printed-circuit board trace routing ? esd protection exceeds 2000v hbm per jesd22-a114, 200v mm per jesd22-a115, and 1000v cdm per jesd22-c101 ? packages offered: msop8, dfn8 pin configurations top view xx: week code UM3212m8 msop8 1 4 5 8 gnd vref1 scl1 sda1 en vref2 scl2 sda2 2 3 6 7 m m: month code UM3212da dfn8 2.11.6
________________________________________________________________________ http://www.union-ic.com rev.03 dec.2013 3/11 UM3212 pin description pin number symbol function 1 gnd ground (0v). 2 vref1 low-voltage side reference supply voltage for scl1 and sda1. 3 scl1 serial clock, low-voltage side; connect to vref1 through a pull-up resistor. 4 sda1 serial data, low-voltage side; connect to vref1 through a pull-up resistor. 5 sda2 serial data, high-voltage side; connect to vref2 through a pull-up resistor. 6 scl2 serial clock, high-voltage side; connect to vref2 through a pull-up resistor. 7 vref2 high-voltage side reference supply voltage for scl2 and sda2. 8 en switch enable input; connect to vref2 and pull-up through a high resistor. ordering information part number packaging type marking code shipping qty UM3212m8 msop8 3212 3000pcs/13inch tape & reel UM3212da dfn8 2.11.6 3212 3000pcs/7inch tape & reel absolute maximum ratings (note 1) over operating free-air temperature range (unless otherwise noted) symbol parameter value unit v ref ( 1 ) reference voltage (1) -0.5 to +6 v v b ias ( ref )( 2 ) reference bias voltage (2) -0.5 to +6 v v i input voltage -0.5(note 2) to +6 v v i/o voltage on an input/output pin -0.5(note 2) to +6 v i ch channel current (dc) +128 ma i ik input clamp current v i 0v -50 ma t st g storage temperature range -65 to +150 c note 1: stresses beyond those listed under "abs olute maximum ratings" may cause permanent damage to the device. these are stress ratings onl y, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operati ng conditions" is not implied. exposure to absolute-maximum-rated c onditions for extended periods may affect device reliability. note 2: the input and input/output negative volta ge ratings may be exceeded if the input and input/output clamp current ratings are observed.
________________________________________________________________________ http://www.union-ic.com rev.03 dec.2013 4/11 UM3212 recommended operating conditions symbol parameter conditions min max unit v i/o voltage on an input/output pin scl1, sda1, scl2, sda2 0 5 v v ref(1) (note 3) reference voltage (1) vref1 0 5 v v bias(ref)(2) (note 3) reference bias voltage (2) vref2 0 5 v v i(en) input voltage on pin en 0 5 v i sw(pass) pass switch current 64 ma t amb ambient temperature operating in free-air -40 +85 c note 3 v ref(1) v bias(ref)(2) ? 1 v for best results in level shifting applications. electrical characteristics t amb = ? 40 c to +85 c, unless otherwise specified. symbol parameter conditions min typ(note 4) max unit v i k input clamping voltage i i = ? 18 ma; v i ( en ) = 0 v -1.2 v i ih high-level input current v i = 5 v; v i ( en ) = 0 v 5 ua c i(en) input capacitance on pin en v i = 0 v or 3 v 13 pf c io(off) off-state input/output capacitance scln, sdan; v o = 0 v or 3 v ; v i ( en ) = 0v 10 12.2 pf c io(on) on-state input/output capacitance scln, sdan; v o = 0 v or 3 v ; v i(en) = 3v 8 12 pf r on on-state resistance(note 5) scln, sdan; (note 6) v i = 0; i o = 64ma en = 4.5v 2.0 5.0 ? en = 3v 2.4 6.0 en = 2.3v 3.1 8.0 en = 1.5v 11 32 scln, sdan; v i = 2.4v; i o = 15ma en = 4.5v 4.6 7.5 en = 3v 50 80 scln, sdan; v i = 1.7v; i o = 15ma en = 2.3v 50 80 note 4 all typical values are at t amb = 25c. note 5 measured by the voltage drop between the scl1 and scl2, or sda1 and sda2 terminals at the indicated current through the switch. on-state resistance is determined by the lowest voltage of the two terminals. note 6 guaranteed by design.
________________________________________________________________________ http://www.union-ic.com rev.03 dec.2013 5/11 UM3212 switching characteristics (translating down) over recommended operating free-air temperature range (unless otherwise noted). values guaranteed by design. symbol parameter test conditions cl=50pf cl=30pf cl=15pf unit min max min max min max v i(en) = 3.3 v; v ih = 3.3 v; v il = 0 v; v m =1.15v(see figure 1). t plh low to high propagation delay from (input) scl2 or sda2 to (output) scl1 or sda1. 0 2.5 0 1.7 0 1.2 ns t phl high to low propagation delay 0 2.5 0 2.0 0 1.3 ns v i(en) =2.5v; v ih = 2.5 v; v il = 0 v; v m = 0.75 v (see figure 1). t plh low to high propagation delay from (input) scl2 or sda2 to (output) scl1 or sda1. 0 2.5 0 1.7 0 1.2 ns t phl high to low propagation delay 0 3.0 0 2.0 0 1.3 ns switching characteristics (translating up) over recommended operating free-air temperature range (unless otherwise noted). values guaranteed by design. symbol parameter test conditions cl=50pf cl=30pf cl=15pf unit min max min max min max v i(en) = 3.3 v; v ih = 2.3 v; v il = 0 v; v tt = 3.3 v; v m = 1.15 v; r l = 300 ? (see figure 1). t plh low to high propagation delay from (input) scl1 or sda1 to (output) scl2 or sda2. 0 2.35 0 1.5 0 1.0 ns t phl high to low propagation delay 0 3.35 0 2.25 0 1.4 ns v i(en) =2.5v; v ih = 1.5 v; v il = 0 v; v tt = 2.5 v; v m = 0.75 v; r l = 300 ? (see figure 1). t plh low to high propagation delay from (input) scl1 or sda1 to (output) scl2 or sda2. 0 2.35 0 1.5 0 1.0 ns t phl high to low propagation delay 0 3.5 0 2.5 0 1.5 ns
________________________________________________________________________ http://www.union-ic.com rev.03 dec.2013 6/11 UM3212 typical application circuit
________________________________________________________________________ http://www.union-ic.com rev.03 dec.2013 7/11 UM3212 vcc scl i 2 c-bus master sda gnd UM3212 2 3 4 1 5 6 7 8 sw sw gnd r pu r pu scl1 sda1 vref1 v ref(1) =1.8v (1) vcc scl i 2 c-bus device sda gnd en vref2 200k ? r pu r pu scl2 sda2 v pu(d) =3.3v (1) (1) in the enabled mode, the applied enable voltage v i(en) and the applied voltage at v ref(1) should be such that v bias(ref)(2) is at least 1 v higher than v ref(1) for best translator operation. fig 3. typical application circuit (switch enable control) on off 3.3v enable signal (1) applications information bidirectional translation for the bidirectional clamping configuration (highe r voltage to lower voltage or lower voltage to higher voltage), the en input must be connected to vref2 and both pins pulled to high side v pu(d) through a pull-up resistor (typically 200 k ? ). this allows vref2 to regulate the en input. a filter capacitor on vref2 is recommended. the i 2 c-bus master output can be totem pole or open-drain (pull-up resistors may be required) and the i 2 c-bus device output can be totem pole or open-drain (pull-up resistors are required to pull the scl2 and sda2 outputs to v pu(d) ). however, if either output is totem pole, data must be unidi rectional or the outputs must be 3-stateable and be controlled by some direction-control mechanism to prevent high-to-low contentions in either direction. if both outputs are open-drain, no direction control is needed. the reference supply voltage (v ref(1) ) is connected to the processor core power supply voltage. when vref2 is connected through a 200 k ? resistor to a 3.3 v to 5.5 v v pu(d) power supply, and v ref(1) is set between 1.0 v and (v pu(d) ? 1 v), the output of each scl1 and sda1 has a maximum output voltage equal to vref1, and the output of each scl2 and sda2 has a maximum output voltage equal to v pu(d) .
________________________________________________________________________ http://www.union-ic.com rev.03 dec.2013 8/11 UM3212 application operating conditions refer to figure 2 symbol parameter conditions min typ (note 7) max unit v bias(ref)(2) reference bias voltage (2) v ref(1) + 0.6 2.1 5 v v i ( en ) input voltage on pin en v ref ( 1 ) + 0.6 2.1 5 v v ref ( 1 ) reference voltage (1) 0 1.5 4.4 v i sw (p ass ) pass switch current - 14 - ma i ref reference current transistor - 5 - a t amb ambient temperature operating in free-air -40 - +85 c note 7: all typical values are at t amb = 25 c. sizing pull-up resistor the pull-up resistor value needs to limit the current through the pass transistor when it is in the on state to about 15ma. this en sures a pass voltage of 260 mv to 350 mv. if the current through the pass transistor is higher than 15ma, the pass voltage also is high er in the on state. to set the current through each pass transistor at 15ma, the pull-up resistor value is calculated as: a . v . v r pu(d) pu 015 0 35 0 ? ? the table below summarizes resistor reference voltages and currents at 15ma, 10ma, and 3ma. the resistor values shown in the +10 % column or a larger value should be used to ensure that the pass voltage of the transistor would be 350 mv or l ess. the external driver must be able to sink the total current from the resistors on both sides of the UM3212 device at 0.175 v, although the 15ma only applies to current flowing through the UM3212 device pull-up resistor values calculated for v ol = 0.35 v; assumes output driver v ol = 0.175 v at stated current. v pu(d) pull-up resistor value ( ? ) 15ma 10ma 3ma nominal +10 % (note 8) nominal +10 % (note 8) nominal +10 % (note 8) 5v 310 341 465 512 1550 1705 3.3v 197 217 295 325 983 1082 2.5v 143 158 215 237 717 788 1.8v 97 106 145 160 483 532 1.5v 77 85 115 127 383 422 1.2v 57 63 85 94 283 312 note 8: +10 % to compensate for v cc range and resistor tolerance.
________________________________________________________________________ http://www.union-ic.com rev.03 dec.2013 9/11 UM3212 package information UM3212m8: msop8 outline drawing 0.750 0.750 e d e top view end view side view e1 e3 c a2 a1 a b ?0.60mm0.038dp e1 l a3 dimensions symbol millimeters inches min max min max a - 1.10 - 0.044 a1 0.05 0.15 0.002 0.006 a2 0.75 0.95 0.030 0.038 a3 0.29 0.49 0.012 0.020 b 0.22 0.38 0.009 0.015 c 0.08 0.23 0.003 0.009 d 2.90 3.10 0.116 0.124 e 4.70 5.10 0.188 0.204 e1 2.90 3.10 0.116 0.124 e3 2.85 3.05 0.114 0.122 e 0.65(bsc) 0.026(bsc) l 0.40 0.80 0.016 0.032 0 8 0 8 land pattern 0.65 0.41 notes: 1. compound dimension: 3.003.00; 2. unit: mm; 3.general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation
________________________________________________________________________ http://www.union-ic.com rev.03 dec.2013 10/11 UM3212 UM3212da: dfn8 2.11.6 outline drawing dimensions symbol millimeters min typ max *d 2.05 2.10 2.175 *e 1.55 1.60 1.675 d2 1.60 1.70 1.80 e2 0.30 0.40 0.50 a 0.545 0.575 0.605 a1 0 0.02 0.05 a3 - 0.13 - b 0.20 0.25 0.30 *l 0.275 0.325 0.375 e - 0.50 - land pattern notes: 1. compound dimension: 2.101.60; 2. unit: mm; 3.general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation 3212 m
________________________________________________________________________ http://www.union-ic.com rev.03 dec.2013 11/11 UM3212 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: 2f, no. 3, lane 647 songtao road, shanghai 201203 tel: 021-51093966 fax: 021-51026018 website: www.union-ic.com

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