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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 adm9264 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 features monitoring of 12 v, 5 v, 3.3 v and 2.8 v supplies in parallel auxiliary sensor inputs low power: 25 m a typical internal comparator hysteresis power supply glitch immunity v cc from 2.5 v to 6 v guaranteed from C40 8 c to +85 8 c no external components 16-pin narrow soic package (150 mil wide) applications microprocessor systems computers controllers intelligent instruments network systems functional block diagram l h v ref nc = no connect l h l h l h pwrok monitor logic 14 13 12 11 16 15 10 9 8 1 2 3 4 7 6 5 gnd su1 su2 su3 su4 nc errx v cc err1 err2 pwrok err3 err4 dis erry su4det adm9264 quad power supply monitor for desktop pcs general description the adm9264 is a quad supply monitor ic which simulta- neously monitors four separate power supply voltages and out- puts error signals if any of the supply voltages go out of limits. it is designed for pc supply monitoring but can be used on any system where multiple power supplies require monitor- ing. the error output signals are available individually and also gated into a common output - pwrok. auxiliary inputs errx, erry are provided which are also gated into the main pwrok signal. these inputs allow signals from other monitor- ing circuits (for example temperature sensor, alarm, etc.) to be linked into the adm9264. each power supply monitor circuit uses a proprietary window comparator design whereby a three resistor network is used in conjunction with two comparators and a single precision voltage reference to check if the supply is within its required operating tolerance. an added feature of this design is that the power supply voltages being monitored can be higher than the power supply voltage to the monitoring ic itself. analog devices experience in the design of power supply super- visory circuits is used to provide an optimum solution for the overall circuit in terms of cost, performance and power con- sumption. key features of the design include the incorporation of hysteresis and glitch immunity into the comparators, which minimizes the possibility of spurious triggering by noise spikes on the supplies being monitored. the part is manufactured on one of analog devices proprietary bicmos processes, which also includes high performance thin film resistors to achieve the accuracy required for the precision voltage reference and power supply high and low trip points.
C2C rev. 0 adm9264Cspecifications parameter min typ max units test conditions/comments operating temperature range C40 85 c industrial (a version) v cc supply voltage 2.5 6.0 v v cc supply current 25 75 m a digital inputs = v cc /gnd su1 input resistance 200 240 k w i in ~ 50 m a when su1 = 12 v su2 input resistance 85 100 k w i in ~ 50 m a when su2 = 5 v su3 input resistance 55 66 k w i in ~ 50 m a when su3 = 3.3 v su4 input resistance 45 56 k w i in ~ 50 m a when su4 = 2.8 v su1 high trip point 12.72 12.96 13.2 v measured with su1 rising su2 high trip point 5.35 5.45 5.55 v measured with su2 rising su3 high trip point 3.53 3.60 3.66 v measured with su3 rising su4 high trip point 2.94 3.00 3.05 v measured with su4 rising su1 low trip point 10.8 11.04 11.28 v measured with su1 falling su2 low trip point 4.45 4.55 4.65 v measured with su2 falling su3 low trip point 2.94 3.00 3.07 v measured with su3 falling su4 low trip point 2.55 2.60 2.66 v measured with su4 falling su1 hysteresis 320 mv measured at su1 su2 hysteresis 130 mv measured at su2 su3 hysteresis 90 mv measured at su3 su4 hysteresis 80 mv measured at su4 glitch immunity 10 m s 100 mv glitch on v cc or su1-4 propagation delay 10 m s delay from supply going outside tolerance until output changes digital input low, v il 0.8 v 4.0 v < v cc < 6 v digital input high, v ih 2.4 v 4.0 v < v cc < 6 v digital input low, v il 0.5 v 2.5 v < v cc < 4.0 v digital input high, v ih 2.0 v 2.5 v < v cc < 4.0 v digital input current C1 +1 m a (errx, erry , dis) open drain output low 0.4 v 10 k w external to po sitive supply v+ open drain output high v+ C0.25 v 10 k w external to positive supply v+ supply range for v+ 2.5 6.0 v v+ can be different from v cc specifications subject to change without notice. (v cc = full operating range, t a = t min to t max unless otherwise noted)
adm9264 C3C rev. 0 ordering guide temperature package model range option 1 adm9264arn C40 c to +85 c r-16a ADM9264ARN-REEL 2 C40 c to +85 c r-16a ADM9264ARN-REEL7 3 C40 c to +85 c r-16a notes 1 r = small outline ic. 2 2500 devices per reel. 3 1000 devices per reel. absolute maximum ratings* (t a = +25 c unless otherwise noted) v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C0.3 v to +6 v su1, su2, su3, su4 . . . . . . . . . . . . . . . . . . C0.3 v to +15 v all other inputs . . . . . . . . . . . . . . . . . . C0.3 v to v cc + 0.3 v all outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . C0.3 v to +6 v output current err1 - 4 , pwrok . . . . . . . . . . . . . . . . 20 ma operating temperature range industrial (a version) . . . . . . . . . . . . . . . . C40 c to +85 c power dissipation, r-16a . . . . . . . . . . . . . . . . . . . 700 mw q ja thermal impedance . . . . . . . . . . . . . . . . . . . 110 c/w lead temperature (soldering, 10 secs) . . . . . . . . . . . . +300 c vapor phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . . +215 c infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . . +220 c storage temperature range . . . . . . . . . . . . C65 c to +150 c *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. warning! esd sensitive device caution esd (electrostatic discharge) sensitive device. electrostatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge without detection. although the adm9264 features proprietary esd protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality.
adm9264 C4C rev. 0 pin function descriptions pin no. mnemonic function 1 gnd ground. 2 su1 supply to be monitored. 12 v 6%. 3 su2 supply to be monitored. 5 v 7%. 4 su3 supply to be monitored. 3.3 v 7%. 5 su4 supply to be monitored. 2.8 v 5%. 6 nc no connect. 7 errx digital input. auxiliary error input (active high). when high it forces pwrok to be low. 8v cc supply monitor ic power supply. can be powered off any power supply between 2.5 v and 6 v including one of the supplies being monitored (except for su1). 9 su4det digital input. disable su4. when high it causes err4 to pull high through 10 k w external resistor to a positive power supply. 10 erry digital input. auxiliary error input (active low). when low it forces pwrok to be low. 11 dis digital input. when high it forces pwrok to be high. 12 err4 open drain output. pulls high through 10 k w external resistor to a positive power supply when su4det is high or su4 is within its required tolerance of 2.8 v 5%. pulls low otherwise. 13 err3 open drain output. low when su3 is outside its required tolerance of 3.3 v 7%. pulls high other- wise through 10 k w external resistor to a positive power supply. 14 pwrok open drain output. pulls high through external 10 k w resistor to a positive power supply when su1, su2, su3 and su4 are all within their required tolerances and when erry is high and when errx is low. pulls low otherwise. 15 err2 open drain output. low when su2 is outside its required tolerance of 5 v 7%. pulls high other- wise through 10 k w external resistor to a positive power supply. 16 err1 open drain output. low when su1 is outside its required tolerance of 12 v 6%. pulls high other- wise through 10 k w external resistor to a positive power supply. pin configuration 14 13 12 11 16 15 10 9 8 1 2 3 4 7 6 5 top view (not to scale) adm9264 nc = no connect gnd err3 pwrok err2 err1 su1 su2 su3 erry dis err4 su4 nc errx v cc su4det
adm9264 C5C rev. 0 circuit information monitor inputs su1 to su4 the adm9624 is provided with four analog inputs, su1 to su4, to monitor supply voltages of +12 v, +5 v, +3.3 v and +2.8 v. each input is connected to a window comparator con- sisting of a pair of voltage comparators and a two-input nor gate. each pair of comparators obtains a reference voltage from a precision internal reference, and each input to be monitored is connected to the comparators via a precision, thin film attenuator, whose resistor ratios determine the trip points of each comparator. as the input voltages are attenu- ated before reaching the comparators, they may exceed the supply voltage of the adm9264 without exceeding the com- mon-mode or differential input range of the comparators. when the input voltage is within limits, the outputs of both comparators are low, so the output of the nor gate is high. if the voltage on the inverting input of the low comparator falls below the reference voltage, or the voltage on the noninverting input of the high comparator rises above the reference voltage, the output of the nor gate will go low. error outputs error outputs err1 to err4 are open-drain outputs that are off (high) when the corresponding input voltage is within limits and on (low) when the input is out of limit. each error output requires a 10 k w pull-up resistor to a positive supply, which may be different from v cc if required. the open-drain construction allows two or more of these outputs to be wire- anded together if required. auxiliary inputs errx, erry errx and erry are ttl-compatible auxiliary inputs that allow external signals such as temperature alarms to be linked into the adm9264. errx is active high and forces pwrok low when it is high. erry is active low and forces pwrok low when it is low. dis input the disable input, dis, is a ttl-compatible input. it overrides all other inputs to the pwrok logic and forces pwrok high when it is high. su4det input su4det is a ttl-compatible input that disables the err4 output, causing err4 to go high when su4det is high. this allows the su4 input to be disabled easily for systems that do not have a 2.8 v supply. pwrok output the pwrok output combines the four error outputs and the auxiliary inputs to give a common power ok output. if the four error outputs are high, errx is low, erry is high and dis is low then pwrok is high, otherwise pwrok is low. pwrok is an open-drain output and requires a 10k pull-up resistor to a positive supply, which may be different from v cc if required. a truth table for the pwrok output is following. truth table dis errx erry err4 err3 err2 err1 pwrok 00 1 1111 1 0x x xxx0 0 0xxxx0x0 0xxx0xx0 0xx0xxx0 0x 0 xxxx 0 01 x xxxx 0 1x x xxxx 1 x = dont care. power supply v cc the adm9264 can be powered from any supply voltage between 2.5 v and 6 v. this includes any of the supply voltages apart from that connected to su1, since this is greater than 6 v. the logic outputs are open-drain and take their output high level from the voltage connected to the pull-up resistor, so they are not dependent on the value of v cc .
temperature ? c 0.5 0.4 0 ?0 85 ?0 hysteresis ?volts 0 15253545556575 0.3 0.2 0.1 figure 1. hysteresis vs. temperature for su1low to high temperature ? c hysteresis ?volts 0.5 0.4 0 ?0 85 200 15253545556575 0.3 0.2 0.1 figure 2. hysteresis vs. temperature for su1high to low temperature ? c 0.2 0.15 0 ?0 85 ?0 hysteresis ?volts 0 152535 45556575 0.1 0.05 figure 3. hysteresis vs. temperature for su2low to high temperature ? c 0.25 0.2 0 ?0 85 ?0 hysteresis ?volts 0 15253545556575 0.15 0.1 0.05 figure 4. hysteresis vs. temperature for su2high to low temperature ? c 0.12 0.06 0 ?0 85 ?0 hysteresis ?volts 0 15253545556575 0.1 0.08 0.04 0.02 figure 5. hysteresis vs. temperature for su3low to high temperature ? c 0.14 0 ?0 85 ?0 hysteresis ?volts 0 152535 45556575 0.12 0.1 0.08 0.06 0.04 0.02 figure 6. hysteresis vs. temperature for su3high to low typical performance characteristicsCadm9264 C6C rev. 0
adm9264 C7C rev. 0 temperature ? c hysteresis ?volts 0.12 0.06 0 ?0 85 200 15253545556575 0.1 0.08 0.04 0.02 figure 7. hysteresis vs. temperature for su4low to high temperature ? c 0.12 0.06 0 ?0 85 ?0 hysteresis ?volts 0 15253545556575 0.1 0.08 0.04 0.02 figure 8. hysteresis vs. temperature for su4high to low 60 40 50 0 ?0 ?0 ?0 20 10 30 temperature ? c 100 0 20406080 ?0 trip point variation ?mv figure 9. variation of su1 high trip point with tempera ture 60 40 50 0 ?0 ?0 ?0 20 10 30 temperature ? c 100 0 20406080 ?0 trip point variation ?mv figure 10. variation of su1 low trip point with temperature 60 40 50 0 ?0 ?0 ?0 20 10 30 temperature ? c 100 0 20406080 ?0 trip point variation ?mv figure 11. variation of su2 high trip point with temperature 60 40 50 0 ?0 ?0 ?0 20 10 30 temperature ? c 100 0 20406080 ?0 trip point variation ?mv figure 12. variation of su2 low trip point with temperature
adm9264 C8C rev. 0 60 40 50 trip point variation ?mv 0 ?0 ?0 ?0 20 10 30 temperature ? c 100 0 20406080 ?0 figure 16. variation of su4 low trip point with temperature temperature ? c 308 302 296 0 100 10 input resistance ?k w 20 30 40 50 60 70 80 90 306 304 300 298 figure 17. su1 input resistance vs. temperature temperature ? c 132 126 120 0 100 10 input resistance ?k w 20 30 40 50 60 70 80 90 130 128 124 122 figure 18. su2 input resistance vs. temperature 60 40 50 0 ?0 ?0 ?0 20 10 30 temperature ? c 100 0 20406080 ?0 trip point variation ?mv figure 13. variation of su3 high trip point with temperature 60 40 50 0 ?0 ?0 ?0 20 10 30 temperature ? c 100 0 20406080 ?0 trip point variation ?mv figure 14. variation of su3 low trip point with temperature 60 40 50 trip point variation ?mv 0 ?0 ?0 ?0 20 10 30 temperature ? c 100 0 20406080 ?0 figure 15. variation of su4 high trip point with temperature
adm9264 C9C rev. 0 temperature ? c 90 84 78 0 100 10 input resistance ?k w 20 30 40 50 60 70 80 90 88 86 82 80 figure 19. su3 input resistance vs. temperature temperature ? c input resistance ?k w 74 68 62 0 100 10 20 30 40 50 60 70 80 90 72 70 66 64 figure 20. su4 input resistance vs. temperature temperature ? c 30 15 0 ?0 85 ?0 supply current ?? 0 15253545556575 25 20 10 5 figure 21. supply current vs. temperature glitch amplitude ?mv 100 40 0 0 1000 100 200 300 400 500 600 700 800 900 90 50 30 10 70 60 20 80 glitch width ?? figure 22. glitch immunity
adm9264 C10C rev. 0 applications a typical application of the adm9264 is shown in figure 23. the analog inputs su1 to su4 are connected to the four power supply outputs of a system to monitor the supply voltages. one of the digital inputs, erry , is connected to a temperature sensor such as the tmp01 or ad22105. the trip point of the overtemperature comparator is set by r set so that the output goes low when the temperature exceeds safe limits. (see the appropriate analog devices data sheet for more information on these devices.) the other digital input, errx, is connected to a fan failure sensor. this can be something as simple as a vane switch mounted in the fan air flow, which opens if the air flow fails. su1 10k w v cc super i/o chip microprocessor su2 10k w v cc su3 10k w v cc su4 10k w v cc errx v cc fan (alarm monitor) ad22105 temperature sensor 6 7 1 2 r set 3 psu #1 12v psu #2 5v psu #3 3.3v psu #4 2.8v dis su4det adm9264 err3 err1 erry err4 err2 figure 23. typical application of adm9264 the digital outputs of the adm9264 are interfaced to the system microprocessor through the gpio lines or via an i/o adapter chip. depending on the level of fault diagnostics required in the system, the four error outputs ( err1 to err4 ) corresponding to the analog inputs su1 to su4 can be indi- vidually connected to the i/o chip to give specific indication of which supply voltage has failed, while the pwrok output indicates an overtemperature or system cooling failure. alter- natively, the pwrok output can be used alone to give a nonspecific failure indication.
adm9264 C11C rev. 0 outline dimensions dimensions shown in inches and (mm). 16-lead narrow soic (r-16a) 16 9 8 1 0.3937 (10.00) 0.3859 (9.80) 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
C12C c3040-10-4/97 printed in u.s.a.

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