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description the A5366 is a low-current bicmos circuit providing all of the required features for a photoelectric type smoke detector. this device can be used with an infrared photoelectric chamber to sense scattered light from smoke particles. a networking capability allows as many as 50 units to be interconnected so that if any unit senses smoke all units will sound an alarm. special features are incorporated in the design to facilitate calibration and testing of the finished detector. the device is recognized by underwriters laboratories for use in smoke alarms that comply with standard ul217, or ul268, per file #s2113. a variable-gain photoamplifier can be directly interfaced to an infrared emitter-detector pair. the amplifier gain levels are determined by two external capacitors and are internally selected depending on the operating mode. low gain is selected during standby and timer modes. during a local alarm, this low gain is increased (internally) by approximately 10% to reduce false triggering. high gain is used during pushbutton test and to periodically monitor the chamber sensitivity during standby. the internal oscillator and timing circuitry keep standby power to a minimum by sensing for smoke for only 100 s every 10 s. a special three-stage?speedup sensing scheme is incorporated to minimize the time to an audible alarm and also to reduce false triggering. chamber sensitivity is periodically monitored and two consecutive cycles of degraded sensitivity are required for a warning signal (chirp) to occur. the A5366 is supplied in a 16-pin dual in-line plastic package (suffix a), and for surface mount, a 16-pin soicw (suffix lw). the lead (pb) free versions (suffix ?t) have 100% matte- tin leadframe plating. the devices are rated for continuous operation over the temperature range of ?25c to 75c. 26110.11-ds, rev. g features and benefits ? low average standby current for long battery life ? interconnect up to 50 detectors ? piezoelectric horn driver ? low battery detection (all internal) ? chamber sensitivity test and alarm ? power-on reset (por) ? internal timer and control for reduced sensitivity mode ? built-in circuits to reduce false triggering ? 6 to 12 v operating range ? esd protection circuitry on all pins ? temporal horn pattern, per ul217, nfpa72, and iso8201 ? ul recognized for ul217 or ul268 applications photoelectric smoke detector with interconnect and timer packages: not to scale A5366 16-pin dip (package a) 16-pin soicw (package lw) typical application diagram c1 c2 detect strobe vdd ired horn1 horn2 i/o feedback led osc cap timing res vss hush test A5366 to / from other units 220 rx2 rx1 100 f 1 k 4.7 k 5 k 4700 pf 0.047 f 560 200 k 220 k 1.5 m 1000 pf 100 k 10 m 330 1500 pf red led push-to-test 9 v 22 f connect hush to vss to disable timer mode value of component can vary, based on the piezoelectric horn used connect to allow timer mode ("hush") operation piezo horn 8.2 k v dd 22 smoke chamber b c c c c b a a 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
photoelectric smoke detector with interconnect and timer A5366 2 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com selection guide part number pb-free package packing A5366ca ? 16-pin dip through hole 25 pieces / tube A5366ca-t yes 16-pin dip through hole 25 pieces / tube A5366clwtr-t yes 16-pin soicw surface mount 1000 pieces / reel absolute maximum ratings* characteristic symbol notes rating units supply voltage range v dd referenced to v ss ?0.5 to 15 v input voltage range v in referenced to v ss ?0.3 to v dd +0.3 v input current i in 10 ma operating ambient temperature range t a ?25 to 75 oc maximum junction temperature t j (max) 150 oc storage temperature range t stg ?55 to 125 oc *caution: bicmos devices have input static protection but are susceptible to damage if exposed to extremely high static electri cal charges. terminal list table number name function 1 c1 sets photoamplifier gain in supervisory mode 2 c2 sets photoamplifier gain in standby mode 3 detect photoamplifier input 4 strobe strobed supply (v dd ? 5 v) for photoamplifier low-side reference 5 vdd positive supply voltage 6 ired output to smoke chamber ir led driver 7 i/o input-output to interconnected detectors 8 horn1 output for driving piezoelectric horn 9 horn2 complementary output for driving piezoelectric horn 10 feedback input for driving piezoelectric horn 11 led output to drive visible led 12 osc cap connection for capacitor to set clock frequency 13 timing res connection for resistor to set clock frequency 14 vss negative supply voltage 15 hush input for photoamplifier timer mode reference; can also disable timer mode 16 test enables push-to-test mode and diagnostic test/calibration mode; starts timer mode, if enabled 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 test hush vss timing res osc cap led feedback horn2 c1 c2 detect strobe vdd ired i/o horn1 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 test hush vss timing res osc cap led feedback horn2 c1 c2 detect strobe vdd ired i/o horn1 package a package lw pin-out diagrams thermal characteristics characteristic symbol test conditions* value units package thermal resistance r ja package a, on 4-layer pcb based on jedec standard 38 oc/w package lw, on 4-layer pcb based on jedec standard 48 oc/w *additional thermal information available on allegro website.
photoelectric smoke detector with interconnect and timer A5366 3 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com band-gap reference low battery photoamp 9 v logic oscillator and timing power-on reset v dd v dd vdd vdd vdd i/o feedback horn1 horn2 led timing res osc cap test hush vss ired strobe c2 c1 detect +supply ? supply + _ + _ functional block diagram
photoelectric smoke detector with interconnect and timer A5366 4 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com dc electrical characteristics at t a = ?25c to 75c 1 . v ss = 0 v, in typical ap pli ca tion (un less oth er wise noted) characteristic symbol test conditions test pin v dd min. typ. 2 max. units supply voltage range v dd 5 ? 6.0 ? 12 v operating supply current i dd average in standby mode, configured per typical application 512??9 a during strobe on, ired off, configured per typical application 5 12 ? ? 2.0 ma during strobe on, ired on, configured per typical application 5 12 ? ? 3.0 ma low-level input voltage v il 7 9 ? ? 1.5 v 10 9 ? ? 2.7 v 16 9 ? ? 7.0 v 15 9 ? ? 0.5 v high-level input voltage v ih 7 9 3.2 ? ? v 10 9 6.3 ? ? v 16 9 8.5 ? ? v 15 9 1.6 ? ? v input leakage high i ih v in = v dd , strobe active, osc cap = v dd 1, 2 12 ? ? 100 na v in = v dd 3, 10, 12 12 ? ? 100 na input leakage low i il v in = v st , strobe active, osc cap = v dd 1, 2, 3 12 ? ? ?100 na v in = v ss 10, 12 12 ? ? ?100 na 15, 16 12 ? ? ?1.0 a input pull-down current i in v in = v dd 16, 15 9 0.25 ? 10 a no local smoke, v in = v dd 7 9 20 ? 80 a no local smoke, v in = 17 v 7 12 ? ? 140 a low-level output voltage v ol i o = 10 ma 11 6.5 ? ? 0.6 v i o = 16 ma 8, 9 6.5 ? ? 1.0 v i o = 5 ma 13 6.5 ? 0.5 ? v high-level output voltage v oh i o = ?16 ma 8, 9 6.5 5.5 ? ? v strobe output voltage v st inactive, i o = ?1 a412 v dd ? 0.1 ??v active, i o = 100 to 500 a49 v dd ? 5.25 ? v dd ? 4.75 v line regulation v st( vdd) active, v dd = 6 to 12 v 4 ? ? ?60 ? db strobe temperature coefficient st v dd = 6 to 12 v 4 ? ? 0.01 ? %/c ired output voltage v ired inactive, i o = 1 a, t a = 25c 6 12 ? ? 0.1 v active, i o = ?6 ma, t a = 25c 6 9 2.85 3.1 3.35 v continued on the next page?
photoelectric smoke detector with interconnect and timer A5366 5 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com line regulation v ired( vdd) active, v dd = 6 to 12 v 6 ? ?35 ? db ired temperature coefficient ired v dd = 6 to 12 v 6 ? ? 0.40 ? %/c high-level output current i oh v dd = alarm, i/o active,v o = v dd ? 2 v 7 9 ?4.0 ? ? ma off leakage current high i oz v o = v dd 11, 13 12 ? ? 1.0 a off leakage current low i oz v o = v ss 11, 13 12 ? ? ?1.0 a low-battery alarm threshold v dd(th) 5 ? 6.9 7.2 7.5 v common mode voltage v ic any alarm condition 1, 2, 3 - v dd ? 4 ? v dd ? 2 v smoke comparator reference voltage v ref any alarm condition internal - v dd ? 3.7 ? v dd ? 3.3 v 1 limits over the operating temperature range are based on characterization data. characteristics are production tested at 25c o nly. 2 typical values are at 25c and are given for circuit design information only. dc electrical characteristics (continued) at t a = ?25c to 75c 1 , v ss = 0 v, in typical ap pli ca tion (un less oth er wise noted) characteristic symbol test conditions test pin v dd min. typ. 2 max. units ac electrical characteristics at t a = ?25c to 75c 1 . v ss = 0 v, in typical ap pli ca tion (un less oth er wise noted) characteristic symbol test conditions test pin v dd min. typ. 2 max. units oscillator period t osc 12 9 9.4 10.5 11.5 ms led pulse period t led1 no local or remote smoke 11 9 39 ? 48 s t led3 local smoke 11 9 0.45 0.50 0.55 s t led4 remote smoke only 11 9 ? no led pulses ?s t led6 pushbutton test, induced alarm 11 9 0.45 0.50 0.55 s t led7 timer mode, no alarm 11 9 9.67 10.75 11.83 s led pulse width t w(led) 11 9 9.5 ? 11.5 ms strobe pulse period t st1 no local or remote smoke 4 9 9.6 ? 11.9 s t st2 after 1 of 3 valid samples 4 9 1.8 2.0 2.2 s t st3 after 2 of 3 valid samples and during local alarm 4 9 0.8 1.0 1.1 s t st4 remote smoke only 4 9 7.2 8.0 8.9 s t st5 chamber test or low battery test, no local alarm 4 9 38.9 ? 47.1 s t st6 pushbutton test, induced alarm 4 9 225 252 278 ms strobe pulse width t w(st) 4 9 9.5 ? 11.5 ms continued on the next page?
photoelectric smoke detector with interconnect and timer A5366 6 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com ired pulse period t ired1 no local or remote smoke 6 9 9.6 ? 11.9 s t ired2 after 1 of 3 valid samples 6 9 1.8 2.0 2.2 s t ired3 after 2 of 3 valid samples and during local alarm 6 9 0.8 1.0 1.1 s t ired4 remote smoke only 6 9 7.2 8.0 8.9 s t ired5 chamber test, no local alarm 6 9 38.9 ? 47.1 s t ired6 pushbutton test, induced alarm 6 9 225 252 278 ms ired pulse width t w(ired) 6 9 94 ? 116 s ired rise time t r(ired) 10% to 90% 6 ? ? 30 s ired fall time t f(ired) 90% to 10% 6 ? ? 200 s i/o to active delay t d(io) local alarm 7 9 ? 0 ? s i/o charge dump duration t dump end of local alarm or test 7 9 0.9 1.0 1.1 s rising edge on i/o to alarm t r(io) no local alarm 7 9 ? ? 13 t osc s horn warning pulse period t horn low battery or degraded chamber sensitivity 8, 9 9 38.9 ? 47.1 s horn warning pulse width t w(horn) low battery or degraded chamber sensitivity 8, 9 9 9.5 ? 11.5 ms horn on-time t on(horn) local or remote alarm 8, 9 9 450 500 550 ms horn off-time t off1(horn) local or remote alarm (see timing diagrams section) 8, 9 9 450 500 550 ms t off2(horn) local or remote alarm (see timing diagrams section) 8, 9 9 1350 1500 1650 ms 1 limits over the operating temperature range are based on characterization data. characteristics are production tested at 25c o nly. 2 typical values are at 25c and are given for circuit design information only. ac electrical characteristics (continued) at t a = ?25c to 75c 1 , v ss = 0 v, in typical ap pli ca tion (un less oth er wise noted) characteristic symbol test conditions test pin v dd min. typ. 2 max. units
photoelectric smoke detector with interconnect and timer A5366 7 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com pin and circuit description (in typical application) c1 pin a capacitor connected to this pin determines the gain, a e , of the photoamplifier during the push-to-test mode and during the chamber monitor test. a typical capacitor value for this high- gain (supervisory) mode is 0.047 f, but it should be selected based on the photochamber background reflections reaching the detector and the desired level of sensitivity. a e = 1 + (c 1 / 10), where c 1 is in pf. a e should not exceed 10,000 and thus c 1 should not exceed 0.1 f. coupling of other signals to the c1, c2, and detect inputs must be minimized. c2 pin a capacitor connected to this pin determines the gain, a e , of the photoamplifier during standby. a typical capacitor value for this low-gain mode is 4700 pf, but it should be selected based on a specific photochamber and the desired level of sensitiv- ity to smoke. a e = 1 + (c 2 / 10), where c 2 is in pf. a e should not exceed 10,000 and thus c 2 should not exceed 0.1 f. this gain increases by a nominal 10% after a local alarm is detected (three consecutive detections). a resistor must be installed in series with the c2 capacitor. detect pin this is the input to the photoamplifier and is connected to the cathode of the photodiode. the photodiode is operated at zero bias and should have low dark leakage current and low capaci- tance. a shunt resistor must be installed in parallel with the photodiode. strobe pin this output provides a strobed, regulated voltage of v dd ? 5 v. the minus side of all internal and external photoamplifier cir- cuitry is referenced to this pin. vdd pin this pin is connected to the positive supply potential and can range from 6 to 12 v with respect to v ss . ired pin this output provides a pulsed base current for the external npn transistor, which drives the ir emitter. its beta should be greater than 100. to minimize noise impact, the ired output is not active when the horn and visible led outputs are active. i/o pin a connection at this pin allows multiple smoke detectors to be interconnected. if any single unit detects smoke, its i/o pin is driven high, and all connected units will sound their associated horns. as an input, the i/o is sampled every fourth clock cycle (nomi- nally 42 ms). when the i/o pin is driven high by another device, three consecutive samples with i/o high plus one additional cycle (nominally 10.5 ms) are required to cause an alarm. if the i/o falls below its threshold at any time during those (nomi- nally) 95 ms, an internal latch is reset and there will not be an alarm. thus, depending on when during the (nominally) 42 ms sample cycle i/o is initially forced high, the i/o must remain high for a minimum of (nominally) 95 to 137 ms to cause an alarm. this filtering provides significant immunity to i/o noise. the led is suppressed when an alarm is signaled from an interconnected unit, and any local alarm condition causes this pin to be ignored as an input. an internal nmos device acts as a charge dump to aid in applications involving large (distrib- uted) capacitance, and is activated at the end of a local or test alarm. this pin has an on-chip pull-down device and must be left unconnected if not used. in the application, there should be a series current-limiting resistor to other smoke alarms. horn1, horn2, feedback pins these three pins are used with a self-resonating piezoelectric transducer and horn-starting external passive components. the output horn1 is connected to the piezo metal support elec- trode. the complementary output, horn2, is connected to the ceramic electrode. the feedback input is connected to the feedback electrode. if the feedback pin is not used, it must be connected to vss. led pin this open-drain nmos output is used to directly drive a visible led. the load for the low-battery test is applied to this output. if an led is not used, it should be replaced with an equivalent resistor (typically 500 to 1000 ) such that the battery load- ing remains about 10 ma. the low-battery test does not occur coincident with any other test or alarm signal. the led also indicates detector status as follows (with component values as in the typical application, all times nominal): condition pulse occurrence standby every 43 s local smoke every 0.5 s remote alarm no pulses test mode every 0.5 s timer mode every 10 s
photoelectric smoke detector with interconnect and timer A5366 8 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com osc cap (oscillator capacitor) pin a capacitor between this pin and vdd, along with a parallel resistor, forms part of a two-terminal oscillator and sets the inter- nal clock low time. with component values shown, this nominal time is 10.4 ms and essentially the oscillator period. the internal clock low time can be calculated by: t low = 0.693 r osccap c osccap . timing res (timing resistor) pin a resistor between this pin and osc cap is part of the two- terminal oscillator and sets the internal clock high time, which is also the ired pulse width. with component values shown, this time is nominally 105 s. the internal clock high time can be calculated by: t high = 0.693 r timingres c osccap . vss pin this pin is connected to the negative supply potential (usually ground). hush pin this input pin has an internal pull-down device and serves two purposes in standby mode. it serves to enable/disable entering the internal 10-minute (nominal) ?hush? timer mode, and also as the reference for the smoke comparator during timer mode. when the voltage on this pin is greater than 1.5 v, entering timer mode is enabled, and a high-to-low transition on the test pin resets and starts timer mode. if use of timer mode is not desired, this pin can be connected to vss or left open, and a voltage of less than 0.5 v on the pin will disable timer mode. during timer mode, the smoke comparator reference is established by a resistive divider (rx1 and rx2) between the vdd and strobe pins and allows the detector to operate with reduced sensitivity during timer mode. this allows the user to hush alarms caused by nuisance smoke or steam (such as from cooking). when not in timer mode, the smoke comparator reference is set internally to approximately v dd ? 3.5 v. test pin this pin has an internal pull-down device and is used to manu- ally invoke two test modes and timer mode. push-to-test mode is initiated by a voltage greater than approxi- mately v dd ? 0.5 v on this pin (usually the depression of a normally-open pushbutton switch to vdd). after one oscilla- tor cycle, the amplifier gain is increased by internal selection of c1 so that background reflections in the smoke chamber can be used to simulate a smoke condition, and ired pulses every 252 ms (nominal). after the third ired pulse (three consecu- tive simulated smoke conditions), the successful test activates table 1. alternate pin configuration during diagnostic test/calibration mode pin name alternate configuration i/o disabled as an output. a logic high on this pin places the photoamplifier output on c1 or c2 as determined by the hush pin. the amplifier output appears as pulses. hush if the i/o pin is high, this pin controls the amplifier gain capacitor. if this pin is low, normal gain is selected and the amplifier output is on pin c1. if this pin is high, supervisory gain is selected and the amplifier output is on c2. note: if i/o is low, four rising edges on this pin will cause the device to exit diagnostic/calibration mode and enter an allegro-defined test mode. feed- back if the i/o pin is high and the hush pin is low (normal gain), taking this pin to a high logic level increases the amplifier gain by 10% (hysteresis). osc cap this pin may be driven by an external clock source. driving this pin low and high drives the internal clock low and high. the external rc network may remain intact. horn1 this pin is reconfigured as the smoke integrator output. three consecutive smoke detections will cause this pin to go high and three consecutive no-smoke detections cause this pin to go low. led this pin becomes a low-battery indicator. the open-drain nmos output is normally off. if v dd falls below the low- battery threshold, the output turns on. the horn drivers and the i/o pin, and the led blinks once every 0.5 s. if the test fails, the led will not blink, the horn will not sound, and the i/o pin will remain low. when the pushbutton is released, the input returns to v ss due to the internal pull down. after one oscillator cycle, the amplifier gain returns to normal, and after three additional ired pulses (less than one second), the device exits this mode and returns to standby. this high-to-low transition on test also resets and starts the 10-minute (nominal) ?hush? timer mode, if the mode is enabled via the hush pin. diagnostic test/calibration mode is available to facilitate calibration and test of the ic and the assembled detector. it is initiated by pulling test below v ss by continuously drawing 400 a from the pin for at least one clock cycle on osc cap. the current should not exceed 800 a and under these condi- tions, test pin voltage will clamp at approximately 250 mv below v ss . one option is to connect test to a ?5 v supply through a 12 k resistor. in this mode, certain device pins are reconfigured as described in table 1. the ired pulse rate is
photoelectric smoke detector with interconnect and timer A5366 9 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com increased to one pulse every osc cap cycle and the strobe pin is always active. to exit this mode, the test pin should be floated, or returned to v ss , for at least one osc cap cycle. alarm indications alarm conditions include: local smoke detection, a remote alarm, low battery, or degraded chamber sensitivity. these are indicated by a combination of horn and led signals, which continue until the alarm condition is resolved. a local alarm always overrides a remote alarm, and a local or remote alarm will inhibit warning signals for low battery or degraded chamber. during a local or a remote alarm condition, the horn output is a continuous modulated tone (temporal horn pattern), nominally: 0.5 s on, 0.5 s off, 0.5 s on, 0.5 s off, 0.5 s on, and 1.5 s off. the visible led distinguishes a local alarm from a remote alarm. during a local alarm, the led blinks every 0.5 s (nominally), but during a remote alarm, the led is disabled and does not blink. the degraded-chamber test occurs periodically (nominally every 43 s). during this test, the gain of the photoamplifier is switched to the high (supervisory) level, set by c1. the device expects that the photodiode will receive enough reflected background light in the chamber to cause an alarm condition. if a faulty, dirty, or obstructed chamber prevents this for two consecutive tests, the device signals degraded chamber with one short (nominally 10 ms) horn chirp every 43 s, essentially halfway between led flashes. the condition is resolved when the chamber is either cleared or cleaned. the low-battery test also occurs periodically (also nominally every 43 s, but offset from the degraded-chamber test). dur- ing this test, the load of the led is applied to the battery, and a resistive divider off v dd is compared to an internal band-gap reference. if v dd is below the threshold, the device signals low battery with one short (nominally 10 ms) horn chirp every 43 s, occurring almost simultaneously with the visible led flash. the condition is resolved when the battery is replaced.
photoelectric smoke detector with interconnect and timer A5366 10 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com osc cap pin strobe pin ired pin led pin led pin led pin internal clock test event horn enable vdd pin chamber sensitivity photo sample chamber test low-battery test low-battery test chamber test horn enable t osc t w(st) t w(led) t w(horn) t w(horn) t horn chirps occur at the end of a failed ?test period,? and are nearly coincident with led flashes chirps occur after 2 consecutive failed tests, and are offset from led flashes and from chirps that indicate failure of low-bat tery tests t st1 , t ired1 t st5 , t ired5 t led1 , t st5 led off (high-z) led on led off (high-z) led on led off (high-z) led on (low battery) failed ?test period? (degraded chamber) t horn 10% 50% 90% t w(ired) t f(ired) t r(ired) timing diagrams (not to scale) standby mode low battery condition degraded chamber condition
photoelectric smoke detector with interconnect and timer A5366 11 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com horn enable t on(horn) t off1(horn) t off2(horn) i/o pin led pin tt st2, ired2 t w(led) 3rd strobe without smoke strobe pin ired pin t w(st) t dump o charge dump / i t dump o charge dump / i (output) (input) horn enable i/o pin t on(horn) t off1(horn) t off2(horn) t r(io) t w(st) strobe pin led pin led pin horn enable i/o pin strobe pin test pin t on(horn) t off1(horn) t off2(horn) (output) t w(st) t w(led) t led6 t led3 t st3, ired3 t t st3, ired3 t t st4, ired4 t t st6, ired6 t 1st strobe with smoke 3rd strobe with smoke led off (high-z) led off (high-z) led on led off (high-z) led on local smoke detection alarm condition remote alarm condition test alarm mode
photoelectric smoke detector with interconnect and timer A5366 12 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com package a, 16-pin dip package lw, 16-pin soic c seating plane 2 1 16 1.27 bsc gauge plane seating plane a terminal #1 mark area b reference land pattern layout (reference ipc7351 soic127p1030x265-16m); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances pcb layout reference view c c 2 1 16 branding scale and appearance at supplier discretion c seating plane 0.65 1.27 9.50 2.25 c 0.10 16x 0.25 bsc 1.40 ref 2.65 max for reference only; not for tooling use (reference ms-013aa) dimensions in millimeters dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown 10.30 0.20 7.50 0.10 10.30 0.33 0.51 0.31 0.30 0.10 0.33 0.20 1.27 0.40 8 0 a branded face 10.92 max 0.38 min 5.33 max +0.51 ?0.38 0.13 min c seating plane 16x 0.25 m c 2.54 bsc 7.62 bsc a a terminal #1 mark area +0.25 ?0.38 1.52 3.30 +1.65 ?0.38 3.30 +0.76 ?0.25 6.35 0.460.10 +0.64 ?0.38 19.05 +0.10 ?0.05 0.25 for reference only; not for tooling use (reference ms-001bb) dimensions in millimeters dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown 2 1 16
photoelectric smoke detector with interconnect and timer A5366 13 allegro microsystems, inc. 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com for the latest version of this document, visit our website: www.allegromicro.com allegro microsystems offers an industry-leading range of ionization and photoelectric smoke detector ics. for a current listing, please visit our website at: www.allegromicro.com copyright ?2009, allegro microsystems, inc. the products described herein are manufactured under one or more of the following u.s. patents: 5,045,920; 5,264,783; 5,442,283 ; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. allegro microsystems, inc. reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be required to per- mit improvements in the per for mance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegro?s products are not to be used in life support devices or systems, if a failure of an allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. the in for ma tion in clud ed herein is believed to be ac cu rate and reliable. how ev er, allegro microsystems, inc. assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use.

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