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________________________________________________________________________ http://www.union-ic.com rev.04 jan.2013 1/11 um202eexe high esd-protected, fail-safe , single supply rs-232 transceivers um202eese sop16 um202eepe dip16 UM202EEUE tssop16 general description the um202eexe series are low power single supply rs232 interface. the device consists of two line drivers, two line receivers, and dual charge pump circuit. the device meets the requirements of tia/eia-232 standard and provides the el ectrical interface between an asynchronous communication controller and the serial-port connect or. the on chip charge pump and four small external capacitors act as onboard dc to dc converter, allow chip operated from single 5v supply, eliminating the need for 10v power s upplies, reduce cost and board space. the device operates at data signaling rates over 250kbps. the slew rate of driver is set internally less than 30v/ s and the receivers feature internal noise filteri ng, eliminating the need for external slew rate and filter capacitors for reliable operation. the driver inputs and receiver outputs are ttl and cmos compatible. um202eexe comes in 16 pi n dip, sop and tssop packages, operating over the commercial and industrial temperature ranges. the esd tolerance has been upgraded on these devices to over 15kv for both human body model and iec61000-4-2 air discharge method, wit hout latch-up. the device operates with four 0.1 f capacitors, reduce system cost and board space. applications ? notebook and palmtop computers ? battery-powered equipment ? hand-held equipment ? pos terminal features ? esd protection for rs-232 bus pins up to 15kv human body model ? single +5v power supply ? low power, i cc 15ma maximum ? operates up to 250kbps ? receiver noise filter ? latch-up performance exceeds 200ma ordering information part number temp. range package type um202eese -40c to +85c sop16 um202eepe -40c to +85c dip16 UM202EEUE -40c to +85c tssop16
________________________________________________________________________ http://www.union-ic.com rev.04 jan.2013 2/11 um202eexe absolute maximum ratings (note 1) symbol parameter value unit v cc supply voltage on v cc -0.3 to +6 v v + voltage on v + (v cc - 0.3) to +14 v v - voltage on v - -14 to +0.3 v t_in voltage on t_in -0.3 to (v cc + 0.3) v r_in voltage on r_in 30 v t_out voltage on t_out (v - - 0.3) to (v + + 0.3) v r_out voltage on r_out -0.3 to (v cc + 0.3) v short-circuit duration, t_out continuous p d continuous power dissipation at t a = 70c sop16 696 dip16 842 mw tssop16 754.7 t a operating temperature range -40 to +85 c t stg storage temperature range -65 to +165 c t l maximum lead temperature for soldering 10 seconds +300 c note 1: stresses beyond those listed under ?a bsolute 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 in the operational sections of the specifications is not implied. exposure to absolute maximum ra ting conditions for extende d periods may affect device reliability.
________________________________________________________________________ http://www.union-ic.com rev.04 jan.2013 3/11 um202eexe electrical characteristics (v cc =+5v10%, c1- c4=0.1uf, t a =t min to t max , unless otherwise noted. typical values are at t a =25 ) parameter symbol conditions min typ max unit dc characteristics v cc su pp l y current i cc no load, t a = +25c 10 15 ma logic input leakage current t_in = 0v to v cc 10 rout v cc 0.05 10 a eia/tia-232e receiver inputs input voltage range -30 30 v input threshold low t a = +25c, v cc = 5v normal o p eration 0.8 1.2 v input threshold high t a = +25c, v cc = 5v normal o p eration 1.7 2.4 v in p ut h y steresis v cc = 5v 0.2 0.5 1.0 v in p ut resistance t a = +25c, v cc = 5v 3 5 7 k ? eia/tia-232e transmitter outputs output voltage swing all drivers loaded with 3k ? to g round 5 9 v output resistance v cc = v+ = v- = 0v, v out = 2v 300 ? output shor t -circuit current short to v cc , gnd or other txd p in 70 ma timing characteristics maximum data rate r l = 3k ? to 7k ? , c l = 50pf to 1000pf, one transmitter switchin g 250 kbps receiver propagation delay t plhr , t phlr c l = 150pf all parts, normal o p eration 0.3 s transmitter pro p a g ation dela y t plht , t phlt r l = 3k ? , c l = 2500pf, all transmitters loaded 1.2 s transition-region slew rate t a = +25c, v cc = 5v, r l = 3k ? to 7k ? , c l = 50pf to 1000pf, measured from -3v to +3v or +3v to -3v, fi g ure 1 20 30 v/ s esd performance transmitter outputs, receiver inputs esd-protection voltage human body model 15 kv iec61000-4-2, contact dischar g e 8 iec61000-4-2, ai r -ga p dischar g e 15
________________________________________________________________________ http://www.union-ic.com rev.04 jan.2013 4/11 um202eexe pin configurations sop16/dip16/tssop16 pin descriptions pin no. pin name function sop/dip/tssop 1,3 c1 + , c1- terminals for positive charge pump capacitor 2 v + +2v cc voltage generated by the charge pump 4,5 c2 + , c2- terminals for negative charge pump capacitor 6 v- -2v cc voltage generated by the charge pump 7,14 t_out rs-232 driver outputs 8,13 r_in rs-232 receiver inputs 9,12 r_out rs-232 receiver outputs 10,11 t_in rs-232 driver inputs 15 gnd ground 16 v cc +4.5v to +5.5v supply voltage input detailed description the um202eexe consists of three sections: char ge-pump voltage converters, drivers, and receivers. these e versions provide extra protec tion against esd. they survive 15kv discharges to the rs-232 inputs and outputs, tested using the human body m odel. when tested according to iec61000-4-2, they survive 8kv contact-discharges and 15kv air-gap discharges. the rugged e versions are intended for use in harsh envi ronments or applications where the rs-232 connection is frequently changed. the um202eexe devices have internal charge pump voltage converters which allow them to operate from a si ngle +5v supply. the charge pumps will operate with polarized or non-polarized capacitors ranging from 0.1 to 10 f and will generate the 9v needed to generate the rs-232 output levels. rs-232 drivers the drivers are inverting transmitters, which accept ttl or cmos inputs and output rs-232 signals with an inverted sense relative to the input logic levels. typically the rs-232 output voltage swing is 9v. even unde r worst case loading conditions of 3k ? and 2500pf, the output is
________________________________________________________________________ http://www.union-ic.com rev.04 jan.2013 5/11 um202eexe guaranteed to be 5v, which is consistent with the rs-232 standard specifications. the transmitter outputs are protected against infinite sh ort-circuits to ground without degradation in reliability. the instantaneous slew rate of th e transmitter output is internally limited to a maximum of 30v/ s in order to meet the rs-232 standard. the smooth transition of the loaded output from v ol to v oh clearly meets the monotonicity requirements of the rs-232 standard. rs-232 receivers the receivers convert rs-232 input signals to inve rted ttl signals. the input thresholds are 0.8v minimum and 2.4v maximum, again well within the 3v rs-232 requirements. the receiver inputs are also protected against voltage up to 30v. a 5k ? pull down resistor to ground will commit the output of the receiver to a high stat e when the pin is float. in actual system applications, it is quite possible for signals to be applied to the receiver inputs before power is applied the receiver circuitry. this occurs, for exampl e, when a pc user attemp ts to print, only to realize the printer wasn?t turned on. in this case an rs-232 signal from the pc will appear on the receiver input at the printer. when the printe r power is turned on, the receiver will operate normally. all of these enhanced devices are fully protected. esd protection um202eexe devices have standard esd protection stru ctures incorporated on the pins to protect against electrostatic discharges encountered during assembly and handling. in addition, the rs232 bus pins (driver outputs and receiver input) of these devices have an extra level of esd protection. advanced esd structures were designed to successf ully protect these pins against esd discharge of 15kv human body model when powered down or up.
________________________________________________________________________ http://www.union-ic.com rev.04 jan.2013 6/11 um202eexe test circuits figure 1
________________________________________________________________________ http://www.union-ic.com rev.04 jan.2013 7/11 um202eexe typical operating circuits figure 2 applications information capacitor selection the capacitor type used for c1?c4 is not critical for proper operation. the um202eexe, require 0.1 f capacitors, although in all cases capacitors up to 10 f can be used without harm. ceramic dielectrics are suggested for the 0.1 f capacitors. when using the minimum recommended capacitor values, make sure the capacitance va lue does not degrade excessively as the operating temperature varies. if in doubt, use capacitors with a larger (e.g., 2x) nominal value. the capacitors? effective series resistance (esr), wh ich usually rises at low temperatures, influences the amount of ripple on v + and v-. use larger capacitors (up to 10 f) to reduce the output impedance at v + and v-. bypass v cc to ground with at least 0.1 f capacitor. in applications sensitive to power-supply noise generated by the charge pumps, decouple v cc to ground with a capacitor the same size as (or larger than ) the charge pump capacitors (c1?c4). v+ and v- as power supplies a small amount of power can be drawn from v + and v-, although this will reduce both driver output swing and noise margins. increasing the value of the charge-pump capacitors (up to 10 f) helps maintain performance when power is drawn from v + or v-. driving multiple receivers each transmitter is designed to drive a single r eceiver. transmitters can be paralleled to drive multiple receivers. high data rates these transceivers maintain the rs-232 5.0v mini mum driver output voltages at data rates of over 250 kbps.
________________________________________________________________________ http://www.union-ic.com rev.04 jan.2013 8/11 um202eexe package information um202eese sop16 outline drawing d b e l dimensions symbol millimeters inches min max min max a 1.35 1.75 0.053 0.069 a1 0.10 0.25 0.004 0.010 b 0.35 0.49 0.014 0.019 c 0.19 0.25 0.007 0.010 e 3.80 4.00 0.150 0.157 d (8 pin) 4.80 5.00 0.189 0.197 d (14 pin) 8.55 8.75 0.337 0.344 d (16 pin) 9.80 10.00 0.386 0.394 e 1.27 0.050 h 5.80 6.20 0.228 0.244 l 0.40 1.27 0.016 0.050
________________________________________________________________________ http://www.union-ic.com rev.04 jan.2013 9/11 um202eexe um202eepe dip16 outline drawing a3 a2 a1 a l dimensions symbol millimeters inches min max min max a - 5.08 - 0.200 a1 0.38 - 0.015 - a2 3.18 4.45 0.125 0.175 a3 1.40 2.03 0.055 0.080 b 0.41 0.56 0.016 0.022 b1 1.14 1.65 0.045 0.065 c 0.20 0.30 0.008 0.012 d (8 pin) 8.84 9.91 0.348 0.390 d (14 pin) 18.67 19.43 0.735 0.765 d (16 pin) 18.92 19.43 0.745 0765 d1 0.13 2.03 0.005 0.080 e 7.62 8.26 0.300 0.325 e1 6.10 7.87 0.240 0.310 e 2.54 - 0.100 - ea 7.62 - 0.300 - eb - 10.16 - 0.400 l 2.92 3.81 0.115 0.150
________________________________________________________________________ http://www.union-ic.com rev.04 jan.2013 10/11 um202eexe UM202EEUE tssop16 outline drawing dimensions symbol millimeters inches min max min max a - 1.20 - 0.047 a1 0.05 0.15 0.002 0.006 a2 0.90 1.05 0.035 0.041 a3 0.34 0.54 0.013 0.021 d 4.86 5.06 0.191 0.199 e 6.20 6.60 0.244 0.260 e1 4.30 4.50 0.169 0.177 b 0.20 0.28 0.008 0.011 e 0.65bsc 0.026bsc
________________________________________________________________________ http://www.union-ic.com rev.04 jan.2013 11/11 um202eexe 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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