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rev. 0 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 adm488/ADM489 one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 617/329-4700 world wide web site: http://www.analog.com fax: 617/326-8703 ? analog devices, inc., 1997 full-duplex, low power, slew rate limited, eia rs-485 transceivers functional block diagrams features meets eia rs-485 standard 250 kbps data rate single +5 v 6 10% supply C7 v to +12 v bus common-mode range 12 k v input impedance 2 kv eft protection meets iec1000-4-4 high em immunity meets iec1000-4-3 reduced slew rate for low em interference short circuit protection excellent noise immunity 30 m a supply current applications low power rs-485 systems dte-dce interface packet switching local area networks data concentration data multiplexers integrated services digital network (isdn) general description the adm488 and ADM489 are low power differential line transceiver suitable for communication on multipoint bus trans- mission lines. they are intended for balanced data transmission and comply with both eia standards rs-485 and rs-422. both products contains a single differential line driver and a single differential line receiver making them suitable for full duplex data transfer. the ADM489 contains an additional receiver and driver enable control. the input impedance is 12 k w , allowing 32 transceivers to be connected on the bus. the adm488/ADM489 operates from a single +5 v 10% power supply. excessive power dissipation caused by bus con- tention or by output shorting is prevented by a thermal shut- down circuit. this feature forces the driver output into a high impedance state if during fault conditions a significant tempera- ture increase is detected in the internal driver circuitry. the receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating). the adm488/ADM489 is fabricated on bicmos, an ad- vanced mixed technology process combining low power cmos with fast switching bipolar technology. the adm488/ADM489 is fully specified over the industrial temperature range and is available in dip, soic and tssop packages. adm488 r d ro di a b z y ADM489 r d ro di a b z y re de
C2C rev. 0 adm488/ADM489Cspecifications (v cc = +5 v 6 10%. all specifications t min to t max unless otherwise noted) parameter min typ max units test conditions/comments driver differential output voltage, v od 5.0 v r = , figure 1 2.0 5.0 v v cc = 5 v, r = 50 w (rs-422), figure 1 1.5 5.0 v r = 27 w (rs-485), figure 1 1.5 5.0 v v tst = C7 v to +12 v, figure 2, v cc = 5 v 5% d |v od | for complementary output states 0.2 v r = 27 w or 50 w , figure 1 common-mode output voltage v oc 3 v r = 27 w or 50 w , figure 1 d |v oc | for complementary output states 0.2 v r = 27 w or 50 w output short circuit current (v out = high) 250 ma C7 v v o +12 v output short circuit current (v out = low) 250 ma C7 v v o +12 v cmos input logic threshold low, v inl 1.4 0.8 v cmos input logic threshold high, v inh 2.0 1.4 v logic input current (de, di) 1.0 m a receiver differential input threshold voltage, v th C0.2 +0.2 v C7 v v cm +12 v input voltage hysteresis, d v th 70 mv v cm = 0 v input resistance 12 k w C7 v v cm +12 v input current (a, b) +1 ma v in = 12 v C0.8 ma v in = C7 v logic enable input current ( re ) 1 m a cmos output voltage low, v ol 0.4 v i out = +4.0 ma cmos output voltage high, v oh 4.0 v i out = C4.0 ma short circuit output current 7 85 ma v out = gnd or v cc three-state output leakage current 1.0 m a 0.4 v v out +2.4 v power supply current outputs unloaded, receivers enabled i cc 30 60 m a de = 0 v (disabled) 37 74 m a de = 5 v (enabled) specifications subject to change without notice. timing specifications parameter min typ max units test conditions/comments driver propagation delay input to output t plh , t phl 250 2000 ns r l diff = 54 w , c l1 = c l2 = 100 pf, figure 5 driver o/p to o/p t skew 100 800 ns r l diff = 54 w , c l1 = c l2 = 100 pf, figure 5 driver rise/fall time t r , t f 250 2000 ns r l diff = 54 w , c l1 = c l2 = 100 pf, figure 5 driver enable to output valid 250 2000 ns r l = 500 w , c l = 100 pf, figure 2 driver disable timing 300 3000 ns r l = 500 w , c l = 15 pf, figure 2 data rate 250 kbps receiver propagation delay input to output t plh , t phl 250 2000 ns c l = 15 pf, figure 5 skew |t plh Ct phl | 100 ns receiver enable t en1 10 50 ns r l = 1 k w , c l = 15 pf, figure 4 receiver disable t en2 10 50 ns r l = 1 k w , c l = 15 pf, figure 4 data rate 250 kbps specifications subject to change without notice. (v cc = +5 v 6 10%. all specifications t min to t max unless otherwise noted)
adm488/ADM489 C3C rev. 0 absolute maximum ratings* (t a = +25 c unless otherwise noted) v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7 v inputs driver input (di) . . . . . . . . . . . . . . . C0.3 v to v cc + 0.3 v control inputs (de, re ) . . . . . . . . . C0.3 v to v cc + 0.3 v receiver inputs (a, b) . . . . . . . . . . . . . . . . C14 v to +14 v outputs driver outputs . . . . . . . . . . . . . . . . . . . . . C14 v to +12.5 v receiver output . . . . . . . . . . . . . . . . C0.5 v to v cc + 0.5 v power dissipation 8-lead dip . . . . . . . . . . . . . . . . . 700 mw q ja , thermal impedance . . . . . . . . . . . . . . . . . . . 120 c/w power dissipation 8-lead soic . . . . . . . . . . . . . . . . 520 mw q ja , thermal impedance . . . . . . . . . . . . . . . . . . . 110 c/w power dissipation 14-lead dip . . . . . . . . . . . . . . . . 800 mw q ja , thermal impedance . . . . . . . . . . . . . . . . . . . 140 c/w power dissipation 14-lead soic . . . . . . . . . . . . . . . 800 mw q ja , thermal impedance . . . . . . . . . . . . . . . . . . . 120 c/w ordering guide model temperature range package description package option adm488ar C40 c to +85 c 8-lead narrow body (soic) so-8 adm488an C40 c to +85 c 8-lead plastic dip n-8 ADM489an C40 c to +85 c 14-lead plastic dip (narrow) n-14 ADM489ar C40 c to +85 c 14-lead narrow body (soic) r-14 ADM489aru C40 c to +85 c 16-lead thin shrink small outline package (tssop) ru-16 power dissipation 16-lead tssop . . . . . . . . . . . . . . 800 mw q ja , thermal impedance . . . . . . . . . . . . . . . . . . . 150 c/w operating temperature range industrial (a version) . . . . . . . . . . . . . . . C40 c to +85 c storage temperature range . . . . . . . . . . . . C65 c to +150 c lead temperature (soldering, 10 secs) . . . . . . . . . . . +300 c vapor phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . +215 c infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . . +220 c esd rating, mil-std-883b . . . . . . . . . . . . . . . . . . . . . 4 kv eft rating, iec1000-4-4 . . . . . . . . . . . . . . . . . . . . . . . 2 kv *stresses above those listed under absolute maximum ratings may cause perma- nent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. exposure to absolute maximum ratings for extended periods of time may affect device reliability.
adm488/ADM489 C4C rev. 0 adm488 pin function descriptions pin mnemonic function 1v cc power supply, 5 v 10%. 2 ro receiver output. when a > b by 200 mv, ro = high. if a < b by 200 mv, ro = low. 3 di driver input. a logic low on di forces y low and z high while a logic high on di forces y high and z low. 4 gnd ground connection, 0 v 5 y noninverting driver, output y 6 z inverting driver, output z 7 b inverting receiver input b 8 a noninverting receiver input a ADM489 pin function descriptions dip/soic tssop pin pin mnemonic function 1, 8, 13 2, 9, 10, nc no connect. no connections 13, 16 are required to this pin. 2 3 ro receiver output. when enabled if a > b by 200 mv then ro = high. if a < b by 200 mv then ro = low. 34 re receiver output enable. a low level enables the receiver output, ro. a high level places it in a high impedance state. 4 5 de driver output enable. a high level enables the driver differential outputs, y and z. a low level places it in a high impedance state. 5 6 di driver input. when the driver is enabled, a logic low on di forces y low and z high, while a logic high on di forces y high and z low. 6, 7 7, 8 gnd ground connection, 0 v 9 11 y noninverting driver output y 10 12 z inverting driver output z 11 14 b inverting receiver input b 12 15 a noninverting receiver input a 14 1 v cc power supply, 5 v 10%. pin configurations 8-lead dip/so 1 2 3 4 8 7 6 5 top view (not to scale) adm488 v cc y z b a ro di gnd 14-lead dip/so 14 13 12 11 10 9 8 1 2 3 4 7 6 5 top view (not to scale) nc = no connect nc b a nc v cc ro re de ADM489 nc y z di gnd gnd 16-lead tssop 14 13 12 11 16 15 10 9 8 1 2 3 4 7 6 5 top view (not to scale) ADM489 nc = no connect v cc nc b a nc nc ro re nc y z de di gnd gnd nc
adm488/ADM489 C5C rev. 0 v od v oc r r figure 1. driver voltage measurement test circuit v od3 v tst 60 v 375 v 375 v figure 2. driver enable/disable test circuit test circuits r l s1 s2 v cc c l v out a b 0v or 3v de in de figure 3. driver voltage measurement test circuit 2 r l s2 v cc c l v out re in re s1 +1.5v ?.5v figure 4. receiver enable/disable test circuit rl diff c l1 c l2 d r ro re a b di +3v de y z figure 5. driver/receiver propagation delay test circuit
adm488/ADM489 C6C rev. 0 switching characteristics ?o vo 1/2vo 0v 3v 1.5v 1.5v t plh t skew +vo 0v 90% point 10% point 90% point 10% point t phl b a t skew t r t f figure 6. driver propagation delay, rise/fall timing t plh t phl 0v 0v 1.5v 1.5v a? ro v ol v oh figure 7. receiver propagation delay t zh 1.5v de 1.5v 3v 0v 2.3v t hz v oh v oh ?0.5v 0v a, b v ol + 0.5v t zl 2.3v t lz v ol a, b figure 8. driver enable/disable timing t zh 1.5v 1.5v 3v 0v 1.5v t hz v oh v oh ?0.5v 0v r v ol + 0.5v t zl 1.5v t lz v ol r re o/p low o/p high figure 9. receiver enable/disable timing
adm488/ADM489 C7C rev. 0 typical performance characteristicsC output voltage ?volts 40 35 0 0 0.5 2.5 1.0 1.5 2.0 20 15 10 5 30 25 output current ?ma figure 10. receiver output low voltage vs. output current output voltage ?volts 0 0.5 5.0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 output current ?ma ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 ?0 figure 13. driver output high voltage vs. output current figure 16. driver output waveform and fft plot transmitting @ 150 khz 10 0% 100 90 t t t ro di 10 0% 100 90 10db/div 500khz/div 0 5mhz output voltage ?volts 0 ? ?0 3.4 3.6 5.0 3.8 4.0 4.2 4.4 4.6 4.8 ?0 ?5 output current ?ma figure 11. receiver output high voltage vs. output current output voltage ?volts 80 0 0 0.5 4.5 1.0 1.5 2.0 3.0 3.5 4.0 2.5 70 40 30 20 10 60 50 output current ?ma figure 14. driver differential output voltage vs. output current limit 30 200 frequency ?mhz 80 70 60 50 40 30 20 10 0 db? figure 17. radiated emissions output voltage ?volts 0 output current ?ma 0.5 3.0 1.0 1.5 2.0 2.5 90 80 0 40 30 20 10 70 50 60 figure 12. driver output low voltage vs. output current figure 15. driving 4000 ft. of cable log frequency (0.15?0) ?mhz 0.3 0.6 1361030 80 0 70 40 30 20 10 60 50 limit db? figure 18. conducted emissions
adm488/ADM489 C8C rev. 0 general information the adm488/ADM489 is a ruggedized rs-485 transceiver that operates from a single +5 v supply. it contains protection against radiated and conducted interference. it is ideally suited for operation in electrically harsh environ- ments or where cables may be plugged/unplugged. it is also immune to high rf field strengths without special shielding precautions. it is intended for balanced data transmission and complies with both eia standards rs-485 and rs-422. it con- tains a differential line driver and a differential line receiver, and is suitable for full duplex data transmission. the input impedance on the adm488/ADM489 is 12 k w , allowing up to 32 transceivers on the differential bus. the adm488/ADM489 operates from a single +5 v 10% power supply. excessive power dissipation caused by bus con- tention or by output shorting is prevented by a thermal shut- down circuit. this feature forces the driver output into a high impedance state if, during fault conditions, a significant tem- perature increase is detected in the internal driver circuitry. the receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating). a high level of robustness is achieved using internal protection circuitry, eliminating the need for external protection compo- nents such as tranzorbs or surge suppressors. low electromagnetic emissions are achieved using slew limited drivers, minimizing interference both conducted and radiated. the adm488/ADM489 can transmit at data rates up to 250 kbps. a typical application for the adm488/ADM489 is illustrated in figure 19. this shows a full-duplex link where data may be transferred at rates up to 250 kbps. a terminating resistor is shown at both ends of the link. this termination is not critical since the slew rate is controlled by the adm488/ADM489 and reflections are minimized. the communications network may be extended to include multipoint connections as shown in figure 25. up to 32 trans- ceivers may be connected to the bus. tables i and ii show the truth tables for transmitting and receiving. table i. transmitting truth table inputs outputs re de di z y x1101 x1010 0 0 x hi-z hi-z 1 0 x hi-z hi-z x = dont care. table ii. receiving truth table inputs output re de a-b ro 00 3 +0.2 v 1 01 +0.2 v 0 0 0 inputs o/c 1 1 0 x hi-z x = dont care. eft transient protection scheme the adm488/ADM489 uses protective clamping structures on its inputs and outputs that clamp the voltage to a safe level and dissipates the energy present in esd (electrostatic) and eft (electrical fast transients) discharges. fast transient burst immunity (iec1000-4-4) iec1000-4-4 (previously 801-4) covers electrical fast-transient/ burst (eft) immunity. electrical fast transients occur as a result of arcing contacts in switches and relays. the tests simu- late the interference generated when, for example, a power relay disconnects an inductive load. a spark is generated due to the well known back emf effect. in fact, the spark consists of a burst of sparks as the relay contacts separate. the voltage ap- pearing on the line, therefore, consists of a burst of extremely fast transient impulses. a similar effect occurs when switching on fluorescent lights. adm488 d ro di a b z y re de +5v 0.1 m f rs-485/rs-422 link r r ADM489 +5v 0.1 m f d ro di re de gnd gnd v cc v cc a b z y figure 19. adm488/ADM489 full-duplex data link
adm488/ADM489 C9C rev. 0 the fast transient burst test, defined in iec1000-4-4, simulates this arcing and its waveform is illustrated in figure 20. it consists of a burst of 2.5 khz to 5 khz transients repeating at 300 ms intervals. it is specified for both power and data lines. four severity levels are defined in terms of an open-circuit volt- age as a function of installation environment. the installation environments are defined as 1. well-protected 2. protected 3. typical industrial 4. severe industrial 300ms 16ms v t v 0.2/0.4ms t 5ns 50ns figure 20. iec1000-4-4 fast transient waveform table iii shows the peak voltages for each of the environments. table iii. v peak (kv) v peak (kv) level psu i-o 1 0.5 0.25 2 1 0.5 32 1 44 2 a simplified circuit diagram of the actual eft generator is illustrated in figure 21. these transients are coupled onto the signal lines using an eft coupling clamp. the clamp is 1 m long and completely sur- rounds the cable, providing maximum coupling capacitance (50 pf to 200 pf typ) between the clamp and the cable. high energy transients are capacitively coupled onto the signal lines. fast rise times (5 ns) as specified by the standard result in very effective coupling. this test is very severe since high voltages are coupled onto the signal lines. the repetitive transients can often cause problems, where single pulses do not. destructive latchup may be induced due to the high energy content of the transients. note that this stress is applied while the interface products are powered up and are transmitting data. the eft test applies hundreds of pulses with higher energy than esd. worst case transient current on an i-o line can be as high as 40 a. high voltage source r c c c z s lr m c d 50 v output figure 21. eft generator test results are classified according to the following: 1. normal performance within specification limits. 2. temporary degradation or loss of performance that is self- recoverable. 3. temporary degradation or loss of function or performance that requires operator intervention or system reset. 4. degradation or loss of function that is not recoverable due to damage. the adm488/ADM489 has been tested under worst case con- ditions using unshielded cables, and meets classification 2 at severity level 4. data transmission during the transient condi- tion is corrupted, but it may be resumed immediately following the eft event without user intervention. radiated immunity (iec1000-4-3) iec1000-4-3 (previously iec801-3) describes the measurement method and defines the levels of immunity to radiated electro- magnetic fields. it was originally intended to simulate the elec- tromagnetic fields generated by portable radio transceivers or any other device that generates continuous wave radiated electro- magnetic energy. its scope has since been broadened to include spurious em energy, which can be radiated from fluorescent lights, thyristor drives, inductive loads, etc. testing for immunity involves irradiating the device with an em field. there are various methods of achieving this including use of anechoic chamber, stripline cell, tem cell and gtem cell. these consist essentially of two parallel plates with an electric field developed between them. the device under test is placed between the plates and exposed to the electric field. there are three severity levels having field strengths ranging from 1 v to 10 v/m. results are classified as follows: 1. normal operation. 2. temporary degradation or loss of function that is self- recoverable when the interfering signal is removed. 3. temporary degradation or loss of function that requires operator intervention or system reset when the interfering signal is removed. 4. degradation or loss of function that is not recoverable due to damage.
adm488/ADM489 C10C rev. 0 the adm488/ADM489 comfortably meets classification 1 at the most stringent (level 3) requirement. in fact, field strengths up to 30 v/m showed no performance degradation and error- free data transmission continued even during irradiation. table iv. level v/m field strength 11 23 310 emi emissions the adm488/ADM489 contains internal slew rate limiting in order to minimize the level of electromagnetic interference generated. figure 22 shows an fft plot when transmitting a 150 khz data stream. 10 0% 100 90 10db/div 500khz/div 0 5mhz figure 22. driver output waveform and fft plot trans- mitting @ 150 khz as may be seen, the slew limiting attenuates the high frequency components. emi is therefore reduced, as are reflections due to improperly terminated cables. en55022, cispr22 defines the permitted limits of radiated and conducted interference from information technology equipment (ite). the objective is to control the level of emissions, both con- ducted and radiated. for ease of measurement and analysis, conducted emissions are assumed to predominate below 30 mhz, while radiated emis- sions predominate above this frequency. conducted emissions this is a measure of noise that is conducted onto the mains power supply. the noise is measured using a lisn (linc im- pedance stabilizing network) and a spectrum analyzer. the test setup is illustrated in figure 23. the spectrum analyzer is set to scan the spectrum from 0 mhz to 30 mhz. figure 24 shows that the level of conducted emissions from the adm488/ ADM489 are well below the allowable limits. spectrum analyzer dut lisn psu figure 23. conducted emissions test setup log frequency (0.15?0) ?mhz 0.3 0.6 1361030 80 0 70 40 30 20 10 60 50 limit db? figure 24. conducted emissions
adm488/ADM489 C11C rev. 0 table v. comparison of rs-422 and rs-485 interface standards specification rs-422 rs-485 transmission type differential differential maximum data rate 10 mb/s 10 mb/s maximum cable length 4000 ft. 4000 ft. minimum driver output voltage 2 v 1.5 v driver load impedance 100 w 54 w receiver input resistance 4 k w min 12 k w min receiver input sensitivity 200 mv 200 mv receiver input voltage range C7 v to +7 v C7 v to +12 v number of drivers/receivers per line 1/10 32/32 d r d r dd rr rt rt figure 25. typical rs-485 network applications information differential data transmission differential data transmission is used to reliably transmit data at high rates over long distances and through noisy environ- ments. differential transmission nullifies the effects of ground shifts and noise signals, which appear as common-mode volt- ages on the line. two main standards are approved by the electronics industries association (eia), which specify the electrical characteristics of transceivers used in differential data transmission. the rs-422 standard specifies data rates up to 10 mbaud and line lengths up to 4000 ft. a single driver can drive a transmis- sion line with up to 10 receivers. in order to cater to true multipoint communications, the rs- 485 standard was defined. this standard meets or exceeds all the requirements of rs-422 and also allows for up to 32 drivers and 32 receivers to be connected to a single bus. an extended common-mode range of C7 v to +12 v is defined. the most significant difference between rs-422 and rs-485 is the fact that the drivers may be disabled thereby allowing more than one (32, in fact) to be connected to a single line. only one driver should be enabled at a time but the rs-485 standard contains additional specifications to guarantee device safety in the event of line contention. cable and data rate the transmission line of choice for rs-485 communications is a twisted pair. twisted pair cable tends to cancel common mode noise and also causes cancellation of the magnetic fields gener- ated by the current flowing through each wire, thereby reducing the effective inductance of the pair. the adm488/ADM489 is designed for bidirectional data com- munications on multipoint transmission lines. a typical applica- tion showing a multipoint transmission network is illustrated in figure 25. an rs-485 transmission line can have as many as 32 transceivers on the bus. only one driver can transmit at a particular time but multiple receivers may simultaneously be enabled. as with any transmission line, it is important that reflections are minimized. this may be achieved by terminating the extreme ends of the line using resistors equal to the characteristic imped- ance of the line. stub lengths of the main line should also be kept as short as possible. a properly terminated transmission line appears purely resistive to the driver.
adm488/ADM489 C12C rev. 0 c3160C12C9/97 printed in u.s.a. 8-lead narrow body (soic) (so-8) 0.1968 (5.00) 0.1890 (4.80) 8 5 4 1 0.2440 (6.20) 0.2284 (5.80) pin 1 0.1574 (4.00) 0.1497 (3.80) 0.0688 (1.75) 0.0532 (1.35) seating plane 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.0500 (1.27) bsc 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 0 0.0196 (0.50) 0.0099 (0.25) x 45 8-lead plastic dip (n-8) 8 14 5 0.430 (10.92) 0.348 (8.84) 0.280 (7.11) 0.240 (6.10) pin 1 seating plane 0.022 (0.558) 0.014 (0.356) 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) max 0.130 (3.30) min 0.070 (1.77) 0.045 (1.15) 0.100 (2.54) bsc 0.160 (4.06) 0.115 (2.93) 0.325 (8.25) 0.300 (7.62) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.115 (2.93) outline dimensions dimensions shown in inches and (mm). 14-lead plastic dip (n-14) 14 17 8 0.795 (20.19) 0.725 (18.42) 0.280 (7.11) 0.240 (6.10) pin 1 0.325 (8.25) 0.300 (7.62) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.115 (2.93) seating plane 0.022 (0.558) 0.014 (0.356) 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) max 0.130 (3.30) min 0.070 (1.77) 0.045 (1.15) 0.100 (2.54) bsc 0.160 (4.06) 0.115 (2.93) 14-lead narrow body (soic) (r-14) 14 8 7 1 0.3444 (8.75) 0.3367 (8.55) 0.2440 (6.20) 0.2284 (5.80) 0.1574 (4.00) 0.1497 (3.80) pin 1 seating plane 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.0688 (1.75) 0.0532 (1.35) 0.0500 (1.27) bsc 0.0099 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 0 0.0196 (0.50) 0.0099 (0.25) x 45 16-lead thin shrink small outline package (tssop) (ru-16) 16 9 8 1 0.201 (5.10) 0.193 (4.90) 0.256 (6.50) 0.246 (6.25) 0.177 (4.50) 0.169 (4.30) pin 1 seating plane 0.006 (0.15) 0.002 (0.05) 0.0118 (0.30) 0.0075 (0.19) 0.0256 (0.65) bsc 0.0433 (1.10) max 0.0079 (0.20) 0.0035 (0.090) 0.028 (0.70) 0.020 (0.50) 8 0

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