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rev. information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of analog devices. a adm222/adm232a/adm242 one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781/329-4700 world wide web site: http://www.analog.com fax: ? analog devices, inc., high-speed, 5 v, 0.1 f cmos rs-232 drivers/receivers features 200 kb/s transmission rate small (0.1 f) charge pump capacitors single 5 v power supply meets all eia-232-e and v.28 specifications two drivers and two receivers on-board dc-dc converters 9 v output swing with 5 v supply 30 v receiver input levels pin compatible with max222/max232a/max242 applications computers peripherals modems printers instruments functional block diagram * internal 400k pull-up resistor on each ttl/cmos input ** internal 5k pull-down resistor on each rs-232 input +5v to +10v voltage doubler +5v to ?0v voltage inverter c1+ c1 v+ v c2+ c2 t1 adm2xx t2 r1 r2 0.1f 0.1f 0.1f gnd ttl/cmos outputs r1 out r2 out t1 out t2 out r1 in r2 in t1 in t2 in ttl/cmos inputs * rs-232 outputs rs-232 inputs ** 0.1f 5v input 0.1f en shdn (adm242) (adm222, adm242) v cc general description the adm222, adm232a, adm242 are a family of high-speed rs-232 line drivers/receivers offering transmission rates up to 200 kb/s. operating from a single 5 v power supply, a highly efficient on-chip charge pump using small (0.1 f) external capacitors allows rs-232 bipolar levels to be developed. two rs-232 drivers and two rs-232 receivers are provided on each device. the devices are fabricated on bicmos, an advanced mixed technology process that combines low power cmos with high- speed bipolar circuitry. this allows for transmission rates up to 200 kb/s, yet minimizes the quiescent power supply current to under 5 ma. the adm232a is a pin-compatible, high-speed upgrade for the ad232 and for the adm232l. it is available in 16-lead dip and in both narrow and wide surface-mount (soic) packages. the adm222 contains an additional shutdown ( shdn ) func- tion that may be used to disable the device, thereby reducing the supply current to 0.1 a. during shutdown, all transmit/r eceive functions are disabled. the adm222 is available in 1 8-lead dip and in a wide surface-mount (soic) package. the adm242 combines both shutdown ( shdn ) and enable ( en ) functions. the shutdown function reduces the supply c urrent to 0.1 ma. during shutdown, the transmitters are dis- abled but the receivers continue to operate normally. the enable function allows the receiver outputs to be disabled thereby facilitating sharing a common bus. the adm242 is available in 18-lead dip and in a wide surface-mount (soic) package. 781/461-3113 b 2010
rev. C2C adm222/adm232a/adm242?pecifications (v cc = 5 v 10%. c1?4 = 0.1 f; all spec- ifications t min to t max unless otherwise noted.) parameter min typ max unit test conditions/comments rs-232 transmitters output voltage swing 5 9 v all transmitter outputs loaded with 3 k ? to ground input logic threshold low, v inl 1.7 0.8 v t in input logic threshold high, v inh 2.4 1.7 v t in logic pull-up current 12 40 at in = 0 v data rate 200 kb/s output resistance 300 ? v cc = v+ = v?= 0 v, v out = 2 v output short circuit current (instantaneous) 10 ma rs-232 receivers rs-232 input voltage range ?0 +30 v rs-232 input threshold low 0.8 1.2 v rs-232 input threshold high 1.6 2.4 v rs-232 input hysteresis 0.2 0.4 1.0 v v cc = 5 v rs-232 input resistance 3 5 7 k ? t a = 0 c to 85 c ttl/cmos output voltage low, v ol 0.05 0.4 v i out = 3.2 ma ttl/cmos output voltage high, v oh 3.5 v i out = ?.0 ma ttl/cmos output short-circuit current ? ?5 ma source current (v out = gnd) * ttl/cmos output short-circuit current 10 35 ma sink current (v out = v cc ) * ttl/cmos output leakage current 0.05 10 a shdn = gnd/ en = v cc 0 v v out v cc en input threshold low, v inl 1.4 0.8 v en input threshold high, v inh 2.0 1.4 v power supply power supply current 4 8 ma no load 13 ma 3 k ? load on both outputs shutdown power supply current 0.1 10 a shdn input leakage current 1 a shdn input threshold low, v inl 1.4 0.8 v shdn input threshold high, v inh 2.0 1.4 v ac characteristics transition region slew rate 3 8 30 v/ sc l = 50 pf to 1000 pf, r l = 3 k ? to 7 k ? measured from +3 v to ? v or ? v to +3 v transmitter propagation delay ttl to rs-232 0.85 3.5 st phlt 1.0 3.5 st plht receiver propagation delay rs-232 to ttl 0.1 0.5 st phlr 0.3 0.5 st plhr receiver output enable time 125 500 ns t er receiver output disable time 160 500 ns t dr transmitter output enable time 250 s shdn goes high transmitter output disable time 3.5 s shdn goes low transmitter + to ?propagation delay difference 150 ns receiver + to ?propagation delay difference 200 ns * guaranteed by design, not production tested. specifications subject to change without notice. b
rev. adm222/adm232a/adm242 C3C absolute maximum ratings * (t a = 25 c unless otherwise noted) v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 v v+ . . . . . . . . . . . . . . . . . . . . . . . . . . . (v cc ?0.3 v) to +13 v v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 v to ?3 v input voltages t in . . . . . . . . . . . . . . . . . . . . . . . . ?.3 v to (v cc + 0.3 v) r in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 v output voltages t out . . . . . . . . . . . . . . . . . . . (v+, +0.3 v) to (v? ?.3 v) r out . . . . . . . . . . . . . . . . . . . . . . . ?.3 v to (v cc + 0.3 v) short circuit duration t out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous power dissipation n-16 . . . . . . . . . . . . . . . . . . . . . . 400 mw (derate 7.5 mw/ c above 70 c) ja , thermal impedance . . . . . . . . . . . . . . . . . . . . 80 c/w power dissipation r-16n . . . . . . . . . . . . . . . . . . . . . 400 mw (derate 7 mw/ c above 70 c) ja , thermal impedance . . . . . . . . . . . . . . . . . . . . 80 c/w power dissipation r-16w . . . . . . . . . . . . . . . . . . . . . 400 mw (derate 7 mw/ c above 70 c) ja , thermal impedance . . . . . . . . . . . . . . . . . . . . 80 cw power dissipation n-18 . . . . . . . . . . . . . . . . . . . . . . 400 mw (derate 7 mw/ c above 70 c) ja , thermal impedance . . . . . . . . . . . . . . . . . . . . 80 c/w power dissipation r-18w . . . . . . . . . . . . . . . . . . . . . 400 mw (derate 7 mw/ c above 70 c) ja , thermal impedance . . . . . . . . . . . . . . . . . . . . 80 c/w operating temperature range industrial (a version) . . . . . . . . . . . . . . . ?0 c to +85 c storage temperature range . . . . . . . . . . . . ?5 c to +150 c lead temperature (soldering, 10 sec) . . . . . . . . . . . . 300 c vapor phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . 215 c infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220 c * this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specifica- tion is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. test circuits v v+ 0v v out 3v v in t phlt t plht figure 1. transmitter propagation delay timing 0.8v 3v 3.5v receiver output en input 0v t er figure 2. receiver enable timing t phlr t plhr gnd v cc 50% v in v out 3v 0v figure 3. receiver propagation delay timing v oh 0.5v receiver output en input v ol + 0.5v v oh v ol 0v 3v t dr figure 4. receiver disable timing b
rev. adm222/adm232a/adm242 C4C v in v out 50pf 3k shdn figure 5. shutdown test circuit + 5v transmitter output shdn input 5v v+ 0v 3v v t dt figure 6. transmitter shutdown disable timing 2 4 6 5 12 11 13 10 3 7 15 8 14 9 18 * internal 400k pull-up resistor on each ttl/cmos input ** internal 5k pull-down resistor on each rs-232 input +5v to +10v voltage doubler +5v to 10v voltage inverter c1+ c1 v+ v c2+ c2 t1 adm222 t2 r1 r2 c1 0.1f c2 0.1f c3 0.1f gnd ttl/cmos outputs r1 out r2 out t1 out t2 out r1 in r2 in t1 in t2 in ttl/cmos inputs * rs-232 outputs rs-232 inputs ** 5v input c5 0.1f 6.3v shdn 16 c4 0.1f v cc 17 figure 7. adm222 typical operating circuit pin function description mnemonic function v cc power supply input, 5 v 10%. v+ internally generated positive supply (+10 v nominal). v internally generated negative supply (?0 v nominal). gnd ground pin. must be connected to 0 v. c1+ external capacitor 1, (+ terminal) is connected to this pin. c1 external capacitor 1, (?terminal) is connected to this pin. c2+ external capacitor 2, (+ terminal) is connected to this pin. c2 external capacitor 2, (?terminal) is connected to this pin. t in transmitter (driver) inputs. these inputs accept ttl/cmos levels. an internal 400 k ? pull-up resistor to v cc is connected on each input. t out transmitter (driver) outputs. these are rs-232 levels (typically 9 v). r in receiver inputs. these inputs accept rs-232 signal levels. an internal 5 k ? pull-down resistor to gnd is connected on each of these inputs. r out receiver outputs. these are ttl/cmos levels. nc no connect. no connections are required to this pin. en (adm242 only) active low digital input. may be used to enable or disable (three-state) both receiver outputs. shdn (adm222 and adm242) active low digital input. may be used to disable the device so that the power consumption is minimized. on the adm222 all drivers and receivers are disabled. on the adm242 the drivers are disabled but the receivers remain enabled. 18 17 16 15 14 13 12 11 10 1 2 3 4 5 6 7 8 9 top view (not to scale) adm222 nc = no connect r2 in t2 out nc c1+ v+ c1 v c2 c2+ t2 in shdn v cc gnd t1 out t1 in r1 out r1 in r2 out figure 8. adm222 dip and soic pin configurations b
rev. adm222/adm232a/adm242 C5C top view (not to scale) 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 c1+ v+ c1 c2+ c2 v t2 out r2 in v cc gnd t1 out r1 in r1 out t1 in t2 in r2 out adm232a figure 9. adm232a dip/soic pin configuration 1 3 5 4 11 10 12 9 2 6 14 7 13 8 * internal 400k pull-up resistor on each ttl/cmos input ** internal 5k pull-down resistor on each rs-232 input +5v to +10v voltage doubler +5v to 10v voltage inverter c1+ c1 v+ v c2+ c2 t1 adm232a t2 r1 r2 c1 0.1f c2 0.1f c3 0.1f gnd ttl/cmos outputs r1 out r2 out t1 out t2 out r1 in r2 in t1 in t2 in ttl/cmos inputs * rs-232 outputs rs-232 inputs ** 5v input c5 0.1f 6.3v 15 c4 0.1f v cc 16 figure 10. adm232a typical operating circuit 18 17 16 15 14 13 12 11 10 1 2 3 4 5 6 7 8 9 top view (not to scale) adm242 r2 in t2 out en c1+ v+ c1 v c2 c2+ t2 in shdn v cc gnd t1 out t1 in r1 out r1 in r2 out figure 11. adm242 dip/soic pin configuration 2 4 6 5 12 11 13 10 3 7 8 14 9 18 * internal 400k pull-up resistor on each ttl/cmos input ** internal 5k pull-down resistor on each rs-232 input +5v to +10v voltage doubler +5v to 10v voltage inverter c1+ c1 v+ v c2+ c2 t1 adm242 t2 r1 r2 c1 0.1f c2 0.1f c3 0.1f gnd ttl/cmos outputs r1 out r2 out t1 out t2 out r1 in r2 in t1 in t2 in ttl/cmos inputs * rs-232 outputs rs-232 inputs ** 5v input c5 0.1f 6.3v 16 c4 0.1f v cc en shdn 15 17 1 figure 12. adm242 typical operating circuit b
rev. adm222/adm232a/adm242 C6C ?ypical performance characteristics load current ma 15 05 v+, v v 10 15 20 25 30 10 5 0 5 10 15 v+ v tpc 1. charge pump v+, vC vs. current load capacitance pf 9 0 500 transmitter output voltage v 7 5 5 1000 1500 2000 2500 3000 115kbps 230kbps 115kbps 460kbps 460kbps 230kbps 3 1 7 9 3 1 tpc 2. transmitter baud rate vs. load capacitance t ch1 10.0v ch2 5.00v m 1.00 s ch2 6.4v : 6.2v : 140ns @: 3.5v t tpc 3. transmitter unloaded slew rate load current ma 15 02 tx o/p voltage v 4681012 10 5 0 5 10 15 14 tx o/p hi tx o/p lo tpc 4. transmitter output voltage vs. current 10 90 100 0% 0.010v 100 s a4 5v 5v tpc 5. charge pump v+, vC exiting shutdown t ch1 10.0v ch2 5.00v m 1.00 s ch2 6.4v : 6.0v : 600ns @: 2.9v t tpc 6. transmitter fully loaded slew rate b
rev. adm222/adm232a/adm242 C7C general information the adm222/adm232a/adm242 are high-speed rs-232 drivers/receivers requiring a single digital 5 v supply. the rs-232 standard requires transmitters that will deliver 5 v minimum on the transmission channel and receivers that can accept signal levels down to 3 v. the parts achieve this by integrating step- up voltage converters and level-shifting t ransmitters and rec eivers onto the same chip. cmos technology is used to keep the power dissipation to an absolute minimum. all devices con- tain an internal charge pump voltage doubler and a voltage inverter that generates 10 v from the 5 v input. four exter- nal 0.1 f capacitors are required for the internal charge pump voltage converter. the adm222/adm232a/adm242 is a modification, en hance- ment and improvement to the ad230-ad241 family and derivatives thereof. it is essentially plug-in-compatible and does not have materially different applications. circuit description the internal circuitry consists of four main sections. these are: charge pump voltage converter ttl/cmos to rs-232 transmitters rs-232 to ttl/cmos receivers enable and shutdown functions. charge pump dc-dc voltage converter the charge pump voltage converter consists of an oscillator and a switching matrix. the converter generates a 10 v supply from the input 5 v level. this is done in two stages using a switched capacitor technique. the 5 v input supply is doubled to 10 v using capacitor c1 as the charge storage element. the ?0 v level is also generated from the input 5 v supply using c1 and c2 as the storage elements. capacitors c3 and c4 are used to reduce the output ripple. their values are not critical and can be reduced if higher levels of ripple are acceptable. the charge pump capacitors c1 and c2 may also be reduced at the expense of higher output imped- ance on the v+ and v?supplies. the v+ and v?su pplies may also be used to power external circuitry if the current req uirements are small. please refer to the typical performance characteristics which shows the v+, v output voltage vs. current. in the shutdown mode the charge pump is disabled and v+ decays to v cc while v?decays to 0 v. transmitter (driver) section the drivers convert ttl/cmos input levels into rs-232 output levels. with v cc = 5 v and driving a typical rs-232 load, the output voltage swing is 9 v. even under worst-case conditions the drivers are guaranteed to meet the 5 v rs-232 minimum requirement. the input threshold levels are both ttl- and cmos-compat- ible with the switching threshold set at v cc /4. with a nominal v cc = 5 v, the switching threshold is 1.25 v typical. unused inputs may be left unconnected, as an internal 400 k ? pull-up resistor pulls them high forcing the outputs into a low state. as required by the rs-232 standard, the slew rate is limited to less than 30 v/ s without the need for an external slew limiting capacitor, and the output impedance in the power-off state is greater than 300 ? . receiver section the receivers are inverting level-shifters that accept rs-232 input levels ( 3 v to 15 v) and translate them into 5 v ttl/ cmos levels. the inputs have internal 5 k ? pull-down resistors to ground and are also protected against overvoltages of up to 30 v. the guaranteed switching thresholds are 0.8 v mini- mum and 2.4 v maximum, which are well within the 3 v rs-232 requirement. the low level threshold is deliberately positive as it ensures that an unconnected input will be inter- preted as a low level. the receivers have schmitt trigger input with a hysteresis level of 0.5 v. this ensures error-free reception for both noisy inputs and for inputs with slow transition times enable and shutdown functions on the adm222, both receivers are fully disabled during shutdown. on the adm242, both receivers continue to operate normally. this function is useful for monitoring activity so that when it occurs, the device can be taken out of the shutdown mode. the adm242 also contains a receiver enable function ( en ) which can be used to fully disable the receivers, independent of shdn . applications information a selection of typical operating circuits is shown in tpcs 1? and figure 13. 10 90 100 0% 5v a1 5 s 2.0v 5v figure 13. transmitter output disable timing b
adm222/adm232a/adm242 ?8? ??? rev. ? b ? outline dimensions controlling dimensions are in inches; millimeter dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design. corner leads may be configured as whole or half leads. compliant to jedec standards ms-001-ab 073106-b 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) 16 1 8 9 0.100 (2.54) bsc 0.800 (20.32) 0.790 (20.07) 0.780 (19.81) 0.210 (5.33) max seating plane 0.015 (0.38) min 0.005 (0.13) min 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 0.060 (1.52) max 0.430 (10.92) max 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.015 (0.38) gauge plane 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) figure 14. 16-lead plastic dual in-line package [pdip] narrow body (n-16) dimensions shown in inches and (millimeters) controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. compliant to jedec standards ms-013- aa 032707-b 10.50 (0.4134) 10.10 (0.3976) 0.30 (0.0118) 0.10 (0.0039) 2.65 (0.1043) 2.35 (0.0925) 10.65 (0.4193) 10.00 (0.3937) 7.60 (0.2992) 7.40 (0.2913) 0 . 7 5 ( 0 . 0 2 9 5 ) 0 . 2 5 ( 0 . 0 0 9 8 ) 45 1.27 (0.0500) 0.40 (0.0157) c oplanarity 0.10 0.33 (0.0130) 0.20 (0.0079) 0.51 (0.0201) 0.31 (0.0122) seating plane 8 0 16 9 8 1 1.27 (0.0500) bsc figure 15. 16-lead standard small outline package [soic_w] wide body (rw-16) dimensions shown in millimeters and (inches)
adm222/adm232a/adm242 rev. ? b ?? ? ? ?9? ? controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. compliant to jedec standards ms-012-ac 10.00 (0.3937) 9.80 (0.3858) 16 9 8 1 6.20 (0.2441) 5.80 (0.2283) 4.00 (0.1575) 3.80 (0.1496) 1.27 (0.0500) bsc seating plane 0.25 (0.0098) 0.10 (0.0039) 0.51 (0.0201) 0.31 (0.0122) 1.75 (0.0689) 1.35 (0.0531) 0.50 (0.0197) 0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) 0.25 (0.0098) 0.17 (0.0067) coplanarity 0.10 8 0 060606-a 45 figure 16. 16-lead standard small outline package [soic_n] narrow body (r-16) dimensions shown in millimeters and (inches) controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. compliant to jedec standards ms-013-ab 0.30 (0.0118) 0.10 (0.0039) 2.65 (0.1043) 2.35 (0.0925) 10.65 (0.4193) 10.00 (0.3937) 7.60 (0.2992) 7.40 (0.2913) 0 . 7 5 ( 0 . 0 2 9 5 ) 0 . 2 5 ( 0 . 0 0 9 8 ) 1.27 (0.0500) 0.40 (0.0157) coplanarity 0.10 0.33 (0.0130) 0.20 (0.0079) 0.51 (0.0201) 0.31 (0.0122) seating plane 8 0 18 10 9 1 1.27 (0.0500) bsc 11.75 (0.4626) 11.35 (0.4469) 060706-a 45 figure 17. 18-lead standard small outline package [soic_w] wide body (rw-18) dimensions shown in millimeters and (inches)
adm222/adm232a/adm242 ?10? ??? rev. ? b ? controlling dimensions are in inches; millimeter dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design. corner leads may be configured as whole or half leads. compliant to jedec standards ms-001 070706-a 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.070 (1.78) 0.060 (1.52) 0.045 (1.14) 18 1 9 10 0.100 (2.54) bsc 0.920 (23.37) 0.900 (22.86) 0.880 (22.35) 0.210 (5.33) max seating plane 0.015 (0.38) min 0.005 (0.13) min 0.280 (7.11) 0.250 (6.35) 0.240 (6.10) 0.060 (1.52) max 0.430 (10.92) max 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.015 (0.38) gauge plane 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) figure 1 8 . 18-lead plastic dual in-line package [pdip] nar row b ody (n-18) dimensions shown in inches and (millimeters) ordering guide model 1 temperature range package description package option adm222an ?40c to +85c 18-lead pdip n-18 adm222anz ?40c to +85c 18-lead pdip n-18 adm222ar ?40c to +85c 18-lead soic_w rw-18 ADM222ARZ ?40c to +85c 18-lead soic_w rw-18 ADM222ARZ-reel ?40c to +85c 18-lead soic_w rw-18 adm232aan ?40c to +85c 16-lead pdip n-16 adm232aanz ?40c to +85c 16-lead pdip n-16 adm232aarn ?40c to +85c 16-lead soic_n r-16 adm232aarn-reel ?40c to +85c 16-lead soic_n r-16 adm232aarn-reel7 ?40c to +85c 16-lead soic_n r-16 adm232aarnz ?40c to +85c 16-lead soic_n r-16 adm232aarnz-reel ?40c to +85c 16-lead soic_n r-16 adm232aarnz-reel7 ?40c to +85c 16-lead soic_n r-16 adm232aarw ?40c to +85c 16-lead soic_w rw-16 adm232aarw-reel ?40c to +85c 16-lead soic_w rw-16 adm232aarwz ?40c to +85c 16-lead soic_w rw-16 adm232aarwz-reel ?40c to +85c 16-lead soic_w rw-16 adm242an ?40c to +85c 18-lead pdip n-18 adm242anz ?40c to +85c 18-lead pdip n-18 adm242ar ?40c to +85c 18-lead soic_w rw-18 adm242ar-reel ?40c to +85c 18-lead soic_w rw-18 adm242arz ?40c to +85c 18-lead soic_w rw-18 adm242arz-reel ?40c to +85c 18-lead soic_w rw-18 1 z = rohs compliant part.
adm222/adm232a/adm242 rev. ? b ?? ? ? ?11? ? revision history 11/10rev. a to rev. b updated outline dimensions ......................................................... 9 changes to ordering guide .......................................................... 10 ?2010 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d01213-0-11/10(b)

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