unisonic technologies co., ltd ut13243 cmos ic www.unisonic.com.tw 1 of 9 copyright ? 2012 unisonic technologies co., ltd qw-r502-573.d +3.0v to +5.5v power supply, 235kbps, multichannael rs-232 line drivers/receivers ? description the utc ut13243 consists of 3 drivers and 5 receivers. it meets ela/tia-232 and v.28/v.24 specifications, it intended for notebook computer applications. a high-efficiency, dual charge-pumps power supply and a low-dropout transmitter combine to deliver true rs-232 performance from a single +3.0v ~ +5.5v power supply. a guaranteed data rate of 120kbps pr ovides compatibility with popular software for communicating with pcs. the utc ut13243 achieves 1a supply current in shutdown condition. when the ut13243 doesn?t detect a valid signal level on its receiver inputs, the on-board power su pply and drivers will shutdown, and when a valid level is applied to any rs-232 receiver input, then the system turn s on again. therefore, the sy stem saves power without changes to the existing bios or operating system. the utc ut13243 requires only 0.1f capacitors in 3.3v operati on, and can operate from input voltages ranging from +3.0v ~ +5.5v. it is ideal for 3.3v-only systems, 5.0v-only systems, or mixed 3.3v and 5.0v systems that require true rs-232 performance. the utc ut13243 includes one complementary always-active receiver that can monitor an external device (such as a modem) in shutdown, without forward biasing t he protection diodes in a uart that may have v cc completely removed. ? features * operates with 3.0v ~ 5.5v power supply * three drivers and five receivers * operates up to 235 kbps * designed to transmit at a data rate of 235 kbps * low standby current (1ua typical) * external capaci tors (4*0.1f) * accepts 5.0v logic input with 3.3v supply * always-active non-inverting receiver output (r 2outb ) * serial-mouse drivability * esd(hbm) protected 8kv(min.) ? ordering information ordering number package packing lead free halogen free ut13243l-p28-t ut13243g-p28-t tssop-28 tube ut13243l-p28-r UT13243G-P28-R tssop-28 tape reel ut13243l-r28-t ut13243g-r28-t ssop-28 tube ut13243l-r28-r ut13243g-r28-r ssop-28 tape reel (1) r: tape reel (2) p28: tssop-28, r28: ssop-28 (3) halogen free, l: lead free ut13243l -p28 -r (1)packing type (2)package type (3)lead free
ut13243 cmos ic unisonic technologies co., ltd 2 of 9 www.unisonic.com.tw qw-r502-573.d ? pin configuration 1 c2+ 2 c2- 3 v- 4 r 1in 5 r 2in 6 r 3in 7 r 4in 8 r 5in 9 t 1out 10 t 2out 11 t 3out 12 t 3in 13 t 2in 14 t 1in 28 c1+ 27 v+ 26 v cc 25 gnd 24 c1- 23 forceon 22 forceoff 21 invalid 20 r 2outb 19 r 1out 18 r 2out 17 r 3out 16 r 4out 15 r 5out utc ut13243 ? pin description pin no. pin name description 1 c2+ positive terminal of inverting charge-pump capacitor 2 c2- negative terminal of inve rting charge-pump capacitor 3 v- -5.5v generated by the charge pump 4~8 r x in rs-232 receiver inputs 9~11 t x out rs-232 transmitter outputs 12~14 t x in ttl/cmos transmitter inputs 15~19 r x out ttl/cmos receiver outputs 20 r 2outb noninverting receiver output?active in shutdown 21 invalid output of the valid signal detector. indica tes if a valid rs-232 level is present on receiver inputs logic ?1?. 22 forceoff drive low to shut down transmitters and on-board power supply. this over-rides all automatic circuitry and forceon (table 1). 23 forceon drive high to override automatic circuitry keeping transmitters on ( forceoff must be high) (table 1). 24 c1- negative terminal of the volt age doubler charge-pump capacitor 25 gnd ground 26 v cc +3.0v ~ +5.5v supply voltage 27 v+ +5.5v generated by the charge pump 28 c1+ positive terminal of the voltage doubler charge-pump capacitor
ut13243 cmos ic unisonic technologies co., ltd 3 of 9 www.unisonic.com.tw qw-r502-573.d ? block diagram
ut13243 cmos ic unisonic technologies co., ltd 4 of 9 www.unisonic.com.tw qw-r502-573.d ? absolute maximum rating parameter symbol ratings unit v cc v cc -0.3~+6 v v+ (note 2) v+ -0.3~+7 v v- (note 2) v- +0.3~-7 v v+ +|v-| (note 2) v pump +13 v input voltages t_in, forceoff , forceon v in -0.3~+6 v r_in 25 v output voltages t_out v out 13.2 v r_out, invalid -0.3~(v cc +0.3) v short-circuit duration t_out sc continuous power dissipation(t a = 70c) p d 696 mw derating above t a =70c 8.70 mw/c 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. v+ and v- can have maximum magnitudes of 7v, but their absolute difference cannot exceed 13v. ? electrical characteristics (v cc = +3.0v~+5.5v, c1~c4=0.1f (note 2), t a = t min to t max , unless otherwise specified) parameter symbol test conditions min typ max unit dc characteristics supply current, shutdown i shdn v cc = 3.3v or 5.0v, t a = 25c all r_in open, forceoff =v cc , forceon = gnd 1.0 10 a forceoff = gnd 1.0 10 a supply current, shutdown disabled i cc forceon = forceoff = v cc , no load 0.3 1.0 ma logic inputs and receiver outputs input logic threshold low v lgl t_in, forceon, forceoff 0.8 v high v lgh t_in, en, forceon, forceoff v cc = 3.3v 2.0 v v cc = 5.0v 2.4 input leakage current i in(lk) t_in, en, forceon, forceoff 0.01 1.0 a output leakage current i rout ( lk ) receivers disabled 0.05 10 a output voltage low v routl i out = 1.6ma 0.4 v high v routh i out = -1.0ma v cc - 0.6 v cc - 0.1 v shutdown (forceon = gnd, forceoff = v cc ) receiver input thresholds to transmitters enabled v r(en) fig.1 positive threshold 2.7 v negative threshold -2.7 disabled v r ( dis ) 1a supply current, fig.1 -0.3 0.3 v invalid output voltage low v invl i out = 1.6ma 0.4 v high v invh i out = -1.0ma v cc - 0.6 v receiver threshold to transmitters enabled t wu fig.2 250 s
ut13243 cmos ic unisonic technologies co., ltd 5 of 9 www.unisonic.com.tw qw-r502-573.d ? electrical characteristics(cont.) (v cc = +3.0v~+5.5v, c1~c4=0.1f (note 2), t a = t min to t max , unless otherwise specified) parameter symbol test conditions min typ max unit receiver positive or negative threshold to invalid high t invh fig.2 1 s low t invl 30 s receiver inputs input voltage range v rr -25 25 v input threshold low v rinl t a = 25c v cc =3.3v 0.6 1.2 v v cc =5.0v 0.8 1.5 input threshold high v rinh t a = 25c v cc =3.3v 1.5 2.4 v v cc =5.0v 1.8 2.4 input hysteresis v rinhys 0.3 v input resistance v rinres t a = 25c 3 5 7 k ? transmitter outputs output voltage swing v toutsw all transmitter outputs loaded with 3k ? to ground 5.0 5.4 v output resistance v toutres v cc = v+ = v- = 0v, transmitter output = 2v 300 10m ? output short-circuit current i tsc 35 60 ma output leakage current i tout(lk) v out =12v, v cc =0v or 3.0v~ 5.5v, transmitters disabled 25 a mouse drivability transmitter output voltage v tout t 1in = t 2in = gnd, t 3in = v cc , t 3out loaded with 3k ? to gnd, t 1out and t 2out loaded with 2.5ma each 5 v timing characteristics maximum data rate dr r l = 3k ? , c l = 1000pf, one transmitter switching 120 235 kbps receiver propagation delay t phl receiver input to receiver output, c l = 150pf 0.3 s t plh 0.3 receiver output time enable t r ( en ) normal operation 200 ns disable t r ( dis ) 200 ns transmitter skew t ts |t phl ? t plh | 200 1000 ns receiver skew t rs |t phl ? t plh | 100 500 ns transition-region slew rate sr v cc =3.3v, t a =25c, r l = 3k ? ~ 7k ? , measured from +3v ~ -3v or -3v ~ +3v c l = 200pf~2500pf 4 8.0 30 v/s c l = 200pf~1000pf 6 30 notes: 1. typical values are at t a = 25c. 2. c1~c4 = 0.1f, measured at 3.3v 10%. c1 = 0.047f, c2~c4 = 0.33f, measured at 5.0v 10%.
ut13243 cmos ic unisonic technologies co., ltd 6 of 9 www.unisonic.com.tw qw-r502-573.d ? detailed description charge-pump voltage converter the utc ut13243 consists of a regulated dual charge pumps that prov ide output voltages of +5.5v and -5.5v, regardless of the input voltage (v cc ) changing from +3.0v to +5.5v. the charge pumps operate in a discont inuous mode: if the output voltages are less than 5.5v, the charge pumps are enabled; if the output vo ltages exceed 5.5v, the charge pumps are disabled. each charge pump requires a flying capacitor (c1, c2 ) and a reservoir capacitor (c3, c4) to generate the v+ and v- supplies, refer to application circuit. rs-232 transmitters utc ut13243 ?s transmitters are inverting level translators that convert cmos-logic levels to 5.0v eia/tia-232 levels. they guarantee a 120kbps data rate with worst-case loads of 3k ? in parallel with 1000pf, providing compatibility with pc-to-pc communication software. typically, the utc ut13243 can operate at data rates of 235kbps. transmitters can be paralleled to drive multiple receivers or mouse. when forceoff is driven to ground, or shutdown circuitry senses invalid voltage levels at all re ceiver inputs, the transmitters are disabled and the outputs are forced into a high-impedance state. rs-232 receivers the utc ut13243 ?s receivers convert rs-232 signals to cmos -logic output levels. all receivers have one inverting three-state output. if the receivers is in s hutdown, the outputs of rece ivers are high impedance. the utc ut13243 has an always-active complementary output (r 2outb ). r 2outb is an extra output that monitors receiver activity while the other receivers are high impeda nce. this allows ring indicator to be monitored without forward biasing other devices connected to the receiv er outputs. this is ideal for systems where v cc is set to 0v in shutdown to accommodate peripherals. table 1. forceoff control truth table forceoff t_out r_out r2outb 0 high-z high-z active 1 active (note 3) active (note 3) active note: 3. if the part is in shutdown mode ( forceoff = v cc , forceon = gnd), it is shutdown if no valid rs-232 levels are present on all receiver inputs. shutdown function a 1a supply current is achieved with shutdown f eature, which operates when forceon is low and forceoff is high. when the utc ut13243 senses no valid signal levels on all receiver inputs for 30s, the on-board power supply and drivers are shut o ff, reducing supply current to 1a. this occurs if the rs-232 cable is disconnected or the connected perip heral transmitters are turned off. the system tu rns on again when a valid le vel is applied to any rs-232 receiver input. as a result, the system saves po wer without changes to the existing bios or operating system. invalid indicates the receiver inputs? condit ion, when using shutdown function, the invalid output is high when the device is on and low when the device is shut down. table 2. shutdown logic control truth table rs-232 signal at receiver input forceoff input forceon input invalid output transceiver status yes h x h normal operation no h h l normal operation (forced on) no h l l shutdown yes l x h shutdown (forced off) no l x l shutdown (forced off)
ut13243 cmos ic unisonic technologies co., ltd 7 of 9 www.unisonic.com.tw qw-r502-573.d ? detailed description(cont.) table 2 summarizes the utc ut13243 operating modes. forceon and forceoff override the automatic circuitry and force the transceiver into its normal operati ng state or into its low-powe r standby state. when neither control is asserted, the ic selects between these stat es automatically based on receiver input levels. 0v +0.3v +2.7v -0.3v -2.7v transmitters enabled, invalid high shutdown, transmitters disabled, 1a supply current, invalid low transmitters enabled, invalid high receiver input levels indeterminate indeterminate fig.1 shutdown input levels when shutdown, the utc ut13243 ?s charge pumps are turned off, v+ decays to v cc , v- decays to ground, the transmitter outputs are disabled (high impedance). the time required to exit shutdown is typically 100s. fig.2 shutdown input timing
ut13243 cmos ic unisonic technologies co., ltd 8 of 9 www.unisonic.com.tw qw-r502-573.d ? typical application circuit utc ut13243 shutdown 5k 5k 5k 5k 5k t1in t2in t3in t1out t2out t3out forceoff forceon invalid r2outb r1out r2out r3out r4out r5out r1in r2in r2in r4in r5in c1+ c1- c2+ c2- c1 c2 v+ v- c3 c4 c bypass vcc gnd 3.0v~5.5v rs-232 inputs rs-232 outputs logic outputs logic inputs to power management unit vcc gnd t1 t2 t3 r2b r1 r2 r3 r4 r5 fig.3 application circuit table 3. required capacitor value v cc (v) c1 (f) c2, c3, c4 (f) c bypass (f) 3.0~3.6 0.1 0.1 0.1 4.5~5.5 0.047 0.33 0.33 3.0~5.5 0.1 0.47 0.47
ut13243 cmos ic unisonic technologies co., ltd 9 of 9 www.unisonic.com.tw qw-r502-573.d ? typical characteristics charge-pump (c1~c4=0.1f) c1+ c1- c2+ c2- c1+ c1- c2+ c2- v cc =3v, out=3k ? v cc =3v, no load 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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