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microprocessor supervisory circuit in 4-lead sc70 ADM6384 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 that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent ri ghts of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ? 2005 analog devices, inc. all rights reserved. features precision power supply monitoring 31 reset threshold options 1.58 v to 5.0 v four reset timeouts 1 ms, 20 ms, 140 ms, 1120 ms manual reset input reset output stage push-pull active-low guaranteed reset output valid to v cc = 1 v power supply glitch immunity specified over ? 40c to +125c temperature range 4-lead sc70 package applications microprocessor systems computers controllers intelligent instruments portable equipment general description the ADM6384 is a supervisory circuit that monitors power supply voltage levels in microprocessor-based systems. a power-on reset signal is generated when the supply voltage rises to a preset threshold level. the debounced manual reset input of the ADM6384 can be used to initiate a reset by means of an external push-button or logic signal. the part is available in a choice of 31 reset threshold options, from 1.58 v to 5.0 v. the minimum reset timeout periods are 1 ms, 20 ms, 140 ms, and 1120 ms. the ADM6384 is available in a 4-lead sc70 package and typi- cally consumes only 7 a, making it suitable for use in low power, portable applications. functional block diagrams ADM6384 v cc gnd reset reset generator debounce mr v ref 05305-001 figure 1. reset reset mr gnd gnd ADM6384 v cc v cc p 100k 05305-002 figure 2.
ADM6384 rev. 0 | page 2 of 12 table of contents specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 5 esd caution .................................................................................. 5 pin configuration and function descriptions ............................. 6 typical performance characteristics ............................................. 7 circuit description ........................................................................... 9 reset output ................................................................................. 9 manual reset input .......................................................................9 application information ................................................................ 10 negative-going v cc transients ................................................ 10 ensuring reset valid to v cc = 0 v ........................................... 10 outline dimensions ....................................................................... 11 ordering guide .......................................................................... 11 revision history 7/05revision 0: initial version
ADM6384 rev. 0 | page 3 of 12 specifications v cc = full operating range; t a = ?40c to +125c, unless otherwise noted. table 1. parameter min typ max unit test conditions/comments supply v cc operating voltage range 1 5.5 v supply current 7 13 a v cc = 5.5 v, no load 6 11 a v cc = 3.6 v, no load 4 7 a v cc = 2.5 v, no load 1 3 6 a v cc = 1.8 v, no load 1 reset threshold voltage ADM6384x50x 4.88 5.00 5.12 v ADM6384x49x 4.78 4.90 5.02 v ADM6384x48x 4.68 4.80 4.92 v ADM6384x47x 4.58 4.70 4.82 v ADM6384x46x 4.51 4.63 4.74 v ADM6384x45x 4.39 4.5 4.61 v ADM6384x44x 4.27 4.38 4.48 v ADM6384x43x 4.19 4.30 4.41 v ADM6384x42x 4.1 4.2 4.31 v ADM6384x41x 4.0 4.1 4.2 v ADM6384x40x 3.9 4.0 4.1 v ADM6384x39x 3.8 3.9 4.0 v ADM6384x38x 3.71 3.8 3.9 v ADM6384x37x 3.61 3.7 3.79 v ADM6384x36x 3.51 3.6 3.69 v ADM6384x35x 3.41 3.5 3.59 v ADM6384x34x 3.32 3.4 3.49 v ADM6384x33x 3.22 3.3 3.38 v ADM6384x32x 3.12 3.2 3.28 v ADM6384x31x 3.00 3.08 3.15 v ADM6384x30x 2.93 3.0 3.08 v ADM6384x29x 2.85 2.93 3.00 v ADM6384x28x 2.73 2.8 2.87 v ADM6384x27x 2.63 2.70 2.77 v ADM6384x26x 2.56 2.63 2.69 v ADM6384x25x 2.44 2.5 2.56 v ADM6384x24x 2.34 2.4 2.46 v ADM6384x23x 2.26 2.31 2.37 v ADM6384x22x 2.13 2.19 2.24 v ADM6384x17x 1.62 1.67 1.71 v ADM6384x16x 1.54 1.58 1.61 v reset threshold temperature coefficient 60 ppm/c v cc to reset delay 35 s v cc falling at 10 mv/s from v th + 100 mv to v th ? 100 mv reset threshold hysteresis 2 x v th mv reset timeout period ADM6384xxd1 1 2 ms ADM6384xxd2 20 40 ms ADM6384xxd3 140 280 ms ADM6384xxd4 1120 2240 ms
ADM6384 rev. 0 | page 4 of 12 parameter min typ max unit test conditions/comments manual reset input mr input threshold v il 0.3 v cc v v cc < 4 v 0.8 v v cc > 4 v v ih 0.7 v cc v v cc < 4 v 2.4 v v cc > 4 v mr input pulse width 1 s mr glitch rejection 100 ns mr pull-up resistance 32 63 100 kv mr to reset delay 200 ns reset output voltage v ol 0.3 v v cc > = 1.0 v, i sink = 80 a 0.3 v v cc > = 2.5 v, i sink = 1.2 ma 0.4 v v cc > = 4.5 v, i sink = 3.2 ma v oh 0.8 v cc v v cc > = 2.5 v, i source = 500 a 0.8 v cc v v cc > = 4.5 v, i source = 800 a 1 t a = 25 o c only.
ADM6384 rev. 0 | page 5 of 12 absolute maximum ratings t = 25c, unless otherwise noted. a table 2. stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. parameter rating v ?0.3 v to +6 v cc reset ?0.3 v to +6 v output current ( reset 20 ma ) operating temperature range ?40c to +125c storage temperature range ?65c to +150c ja thermal impedance, sc70 331c/w soldering temperature sn/pb 240c, 30 sec pb-free 260c, 40 sec esd caution esd (electrostatic discharge) sensitive device. electros tatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge wi thout detection. although this product features proprietary esd protection circuitry, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degrada- tion or loss of functionality.
ADM6384 rev. 0 | page 6 of 12 pin configuration and fu nction descriptions gnd 1 reset 2 v cc 4 mr 3 ADM6384 top view (not to scale) 05305-003 figure 3. pin configuration table 3. pin function descriptions pin no. name description 1 gnd ground. 2 reset active-low reset output. asserted whenever v cc is below the reset threshold, v th . push-pull output stage. 3 mr manual reset input. this is an active-low input which, when forced low for at least 1 s, generates a reset. it features a 52 kv internal pull-up. 4 v power supply voltage being monitored. cc
ADM6384 rev. 0 | page 7 of 12 typical performance characteristics 04535-006 temperature (c) 120 ?40 ?20 0 20 40 60 80 100 i cc ( a) 10.0 9.5 7.5 7.0 6.5 9.0 8.5 8.0 6.0 5.5 5.0 4.5 4.0 3.5 04535-010 temperature (c) 120 ?40 0 ?20 40 20 100 8060 normalized reset threshold 1.05 1.03 1.04 1.01 1.02 0.99 1.00 0.97 0.98 0.95 0.96 figure 4. supply current vs. temperature figure 7. normalized reset threshold vs. temperature 04535-008 temperature (c) 120 ?40 0 ?20 40 20 100 8060 v cc to reset delay ( s) 100 90 80 60 70 40 50 20 10 30 0 04535-017 i sink (ma) 7 0123456 v out (v) 0.20 0.15 0.10 0.05 0 to reset output delay vs. temperature figure 5. v figure 8. output voltage low vs. i cc sink 04535-007 temperature (c) 120 ?40 0 ?20 40 20 100 8060 normalized reset timeout 1.20 1.15 1.10 1.05 0.95 1.00 0.90 0.85 0.80 04535-018 i source (ma) 1.0 0 0.2 0.4 0.6 0.8 v out (v) 2.92 2.90 2.88 2.86 2.84 2.82 figure 6. normalized reset timeout period vs. temperature figure 9. output voltage high vs. i source
ADM6384 rev. 0 | page 8 of 12 05305-011 temperature (c) ?40 ?20 0 20 40 60 80 100 120 manual reset to reset delay (ns) 340 280 320 300 260 220 240 200 180 160 140 120 100 05305-010 overdrive vod (mv) 1000 10 100 maximum transient duration ( s) 160 120 140 100 60 80 40 20 0 v th = 4.63v v th = 2.93v reset occurs above curve transient duration vs. reset threshold overdrive figure 10. maximum v figure 11. manual reset minimum pulse width vs. temperature cc
ADM6384 rev. 0 | page 9 of 12 circuit description v cc 1v v cc 0v v th v th 0v v cc reset t rd t rp 05305-012 the ADM6384 provides microprocessor supply voltage supervision by controlling the microprocessors reset input. code execution errors are avoided during power-up, power- down, and brownout conditions by asserting a reset signal when the supply voltage is below a preset threshold. in addition, the ADM6384 allows supply voltage stabilization with a fixed timeout before the reset deasserts after the supply voltage rises above the threshold. if the user detects a problem with the systems operation, a manual reset input is available to reset the microprocessor by means of an external push-button, for example. figure 12. reset timing diagram manual reset input the ADM6384 features a manual reset input ( mr ) which, when driven low, asserts the reset output. when mr transitions from low to high, reset remains asserted for the duration of the reset active timeout period before deasserting. the reset output mr input has a 52 k internal pull-up so that the input is always high when unconnected. an external push-button switch can be connected between the ADM6384 features an active-low push-pull reset output. the reset signal is guaranteed to be logic low for v cc down to 1 v. mr and ground so that the user can generate a reset. debounce circuitry for this purpose is integrated on-chip. noise immunity is provided on the the reset output is asserted when v cc is below the reset threshold (v mr input, and fast, negative-going transients of up to 100 ns (typ) are ignored. a 0.1 f capacitor between th ) or when mr is driven low. reset remains asserted for the duration of the reset active timeout period (t mr and ground provides additional noise immunity. rp ) after v cc rises above the reset threshold or after mr transitions from low to high. figure 12 illustrates the behavior of the reset outputs.
ADM6384 rev. 0 | page 10 of 12 application information negative-going v cc transients ensuring reset valid to v cc = 0 v to avoid unnecessary resets caused by fast power supply transients, the ADM6384 is equipped with glitch rejection circuitry. the typical performance characteristic in both active-low and active-high reset outputs are guaranteed to be valid for v cc as low as 1 v. however, by using an external resistor with push-pull configured reset outputs, valid outputs for v figure 10 plots v cc transient duration versus the transient magnitude. the curves show combinations of transient magnitude and duration for which a reset is not generated for 4.63 v and 2.93 v reset threshold parts. for example, with the 2.93 v threshold, a transient that goes 100 mv below the threshold and lasts 8 s typically does not cause a reset, but if the transient is any bigger in magnitude or duration, a reset is generated. an optional 0.1 f bypass capacitor mounted close to v cc as low as 0 v are possible. for an active-low reset output, a resistor connected between reset and ground pulls the output low when it is unable to sink current. a large resistance such as 100 k should be used so that it does not overload the reset output when v cc is above 1 v. reset gnd ADM6384 100k 05305-013 v cc cc provides additional glitch rejection. = 0 v figure 13. ensuring reset valid to v cc
ADM6384 rev. 0 | page 11 of 12 outline dimensions * package outline corresponds in full to eiaj sc82 except for width of pin-2 as shown 0.30 0.15 0.10 max 1.00 0.80 seating plane 0.18 0.10 0.30 0.10 0.10 coplanarity 2 4 3 1 2.20 1.80 pin 1 0.50 bsc * 0.70 0.50 1.35 1.15 2.40 1.80 1.10 0.80 0.65 bsc 0.40 0.10 12 8 figure 14. 4-lead thin shrink small outline transistor package [sc70] (ks-4) dimensions shown in millimeters ADM6384yks __ d _- rl7 ordering quantity rl7: 3,000 piece reel generic number package code ks: 4-lead sc70 z: lead free reset threshold number (16 to 50) reset timeout period 1: 1ms (min) 2: 20ms (min) 3: 140s (min) 4: 1120s (min) temperature range y: ?40c to +125c 05305-014 xx x figure 15. ordering code structure ordering guide package type branding standard models reset threshold (v) reset timeout (ms) temperature range quantity 1 ADM6384yks29d1-rl7 2.93 1 3k sc70-4 n0j ?40c to +125c ADM6384yks23d3-rl7 2.31 140 3k sc70-4 1 if ordering nonstandard models, complete the ordering code shown in figure 15 by inserting reset timeout and reset threshold s uffixes. contact sales for availability of nonstandard models. ?40c to +125c n0j ADM6384yks29d3-rl7 2.93 140 3k sc70-4 n0j ?40c to +125c
ADM6384 rev. 0 | page 12 of 12 notes ? 2005 analog devices, inc. all ri ghts reserved. trademarks and registered trademarks are the prop erty of their respective owners. d05305C0C7/05(0)

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