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| a FEATURES Monitoring of 12 V, 5 V, 3.3 V and 2.8 V Supplies in Parallel Auxiliary Sensor Inputs Low Power: 25 A Typical Internal Comparator Hysteresis Power Supply Glitch Immunity VCC from 2.5 V to 6 V Guaranteed from -40 C to +85 C No External Components 16-Pin Narrow SOIC Package (150 Mil Wide) APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Network Systems Quad Power Supply Monitor for Desktop PCs ADM9264 FUNCTIONAL BLOCK DIAGRAM L GND 1 H SU1 2 15 ERR2 16 ERR1 L PWROK MONITOR LOGIC SU2 3 H 14 PWROK L SU3 4 13 ERR3 H SU4 5 L NC 6 H 11 DIS 12 ERR4 GENERAL DESCRIPTION ERRX 7 VREF 10 ERRY The ADM9264 is a Quad Supply Monitor IC which simultaneously monitors four separate power supply voltages and outputs 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 monitoring. 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 monitoring 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. VCC 8 ADM9264 NC = NO CONNECT 9 SU4DET Analog Devices' experience in the design of power supply supervisory circuits is used to provide an optimum solution for the overall circuit in terms of cost, performance and power consumption. 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. 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. 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 (c) Analog Devices, Inc., 1997 ADM9264-SPECIFICATIONS Parameter OPERATING TEMPERATURE RANGE VCC SUPPLY VOLTAGE VCC SUPPLY CURRENT SU1 INPUT RESISTANCE SU2 INPUT RESISTANCE SU3 INPUT RESISTANCE SU4 INPUT RESISTANCE SU1 HIGH TRIP POINT SU2 HIGH TRIP POINT SU3 HIGH TRIP POINT SU4 HIGH TRIP POINT SU1 LOW TRIP POINT SU2 LOW TRIP POINT SU3 LOW TRIP POINT SU4 LOW TRIP POINT SU1 HYSTERESIS SU2 HYSTERESIS SU3 HYSTERESIS SU4 HYSTERESIS GLITCH IMMUNITY PROPAGATION DELAY DIGITAL INPUT LOW, VIL DIGITAL INPUT HIGH, VIH DIGITAL INPUT LOW, VIL DIGITAL INPUT HIGH, VIH DIGITAL INPUT CURRENT OPEN DRAIN OUTPUT LOW OPEN DRAIN OUTPUT HIGH SUPPLY RANGE FOR V+ Specifications subject to change without notice. (VCC = Full Operating Range, TA = TMIN to TMAX unless otherwise noted) Typ Max 85 6.0 25 75 Units C V A k k k k 13.2 5.55 3.66 3.05 11.28 4.65 3.07 2.66 V V V V V V V V mV mV mV mV s s 0.8 V V 0.5 V V +1 0.4 A V V 6.0 V Digital Inputs = VCC/GND I IN ~ 50 A when SU1 = 12 V I IN ~ 50 A when SU2 = 5 V I IN ~ 50 A when SU3 = 3.3 V I IN ~ 50 A when SU4 = 2.8 V Measured with SU1 Rising Measured with SU2 Rising Measured with SU3 Rising Measured with SU4 Rising Measured with SU1 Falling Measured with SU2 Falling Measured with SU3 Falling Measured with SU4 Falling Measured at SU1 Measured at SU2 Measured at SU3 Measured at SU4 100 mV Glitch on VCC or SU1-4 Delay from Supply Going Outside Tolerance until Output Changes 4.0 V < VCC < 6 V 4.0 V < VCC < 6 V 2.5 V < VCC < 4.0 V 2.5 V < VCC < 4.0 V (ERRX, ERRY, DIS) 10 k External to Positive Supply V+ 10 k External to Positive Supply V+ V+ Can Be Different from VCC Test Conditions/Comments Industrial (A Version) Min -40 2.5 200 85 55 45 12.72 5.35 3.53 2.94 10.8 4.45 2.94 2.55 240 100 66 56 12.96 5.45 3.60 3.00 11.04 4.55 3.00 2.60 320 130 90 80 10 10 2.4 2.0 -1 V+ -0.25 2.5 -2- REV. 0 ADM9264 ABSOLUTE MAXIMUM RATINGS* (TA = +25C unless otherwise noted) ORDERING GUIDE VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to +6 V SU1, SU2, SU3, SU4 . . . . . . . . . . . . . . . . . . -0.3 V to +15 V All Other Inputs . . . . . . . . . . . . . . . . . . -0.3 V to VCC + 0.3 V All Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to +6 V Output Current ERR1-4, PWROK . . . . . . . . . . . . . . . . 20 mA Operating Temperature Range Industrial (A Version) . . . . . . . . . . . . . . . . -40C to +85C Power Dissipation, R-16A . . . . . . . . . . . . . . . . . . . 700 mW JA Thermal Impedance . . . . . . . . . . . . . . . . . . . 110C/W Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . . +300C Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . . +215C Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . . +220C Storage Temperature Range . . . . . . . . . . . . -65C to +150C *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 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. Model ADM9264ARN ADM9264ARN-REEL2 ADM9264ARN-REEL73 NOTES 1 R = Small Outline IC. 2 2500 devices per reel. 3 1000 devices per reel. Temperature Range -40C to +85C -40C to +85C -40C to +85C Package Option1 R-16A R-16A R-16A 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. WARNING! ESD SENSITIVE DEVICE REV. 0 -3- ADM9264 PIN CONFIGURATION GND 1 SU1 2 SU2 3 SU3 4 16 ERR1 15 ERR2 14 PWROK 13 ERR3 TOP VIEW SU4 5 (Not to Scale) 12 ERR4 NC 6 ERRX 7 VCC 8 11 DIS 10 ERRY 9 SU4DET ADM9264 NC = NO CONNECT PIN FUNCTION DESCRIPTIONS Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Mnemonic GND SU1 SU2 SU3 SU4 NC ERRX VCC SU4DET ERRY DIS ERR4 ERR3 PWROK Function Ground. Supply to Be Monitored. 12 V 6%. Supply to Be Monitored. 5 V 7%. Supply to Be Monitored. 3.3 V 7%. Supply to Be Monitored. 2.8 V 5%. No Connect. Digital Input. Auxiliary error input (active high). When High it forces PWROK to be Low. 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). Digital Input. Disable SU4. When High it causes ERR4 to pull high through 10 k external resistor to a positive power supply. Digital Input. Auxiliary error input (active low). When Low it forces PWROK to be Low. Digital Input. When High it forces PWROK to be High. Open Drain Output. Pulls high through 10 k 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. Open Drain Output. Low when SU3 is outside its required tolerance of 3.3 V 7%. Pulls High otherwise through 10 k external resistor to a positive power supply. Open Drain Output. Pulls High through external 10 k 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. Open Drain Output. Low when SU2 is outside its required tolerance of 5 V 7%. Pulls High otherwise through 10 k external resistor to a positive power supply. Open Drain Output. Low when SU1 is outside its required tolerance of 12 V 6%. Pulls High otherwise through 10 k external resistor to a positive power supply. 15 16 ERR2 ERR1 -4- REV. 0 ADM9264 CIRCUIT INFORMATION Monitor Inputs SU1 to SU4 SU4DET Input 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 consisting 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 attenuated before reaching the comparators, they may exceed the supply voltage of the ADM9264 without exceeding the common-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 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 VCC if required. A truth table for the PWROK output is following. Truth Table DIS ERRX ERRY ERR4 ERR3 ERR2 ERR1 PWROK 0 0 0 0 0 0 0 1 0 X X X X X 1 X 1 X X X X 0 X X 1 X X X 0 X X X 1 X X 0 X X X X 1 X 0 X X X X X 1 0 X X X X X X 1 0 0 0 0 0 0 1 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 pull-up resistor to a positive supply, which may be different from VCC if required. The open-drain construction allows two or more of these outputs to be wireANDed together if required. Auxiliary Inputs ERRX, ERRY X = don't care. Power Supply VCC 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 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 VCC. 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. REV. 0 -5- Typical Performance Characteristics-ADM9264 0.5 0.25 0.4 HYSTERESIS - Volts HYSTERESIS - Volts 0.2 0.3 0.15 0.2 0.1 0.1 0.05 0 -30 -20 0 15 25 35 45 55 TEMPERATURE - C 65 75 85 0 -30 -20 0 15 25 35 45 55 TEMPERATURE - C 65 75 85 Figure 1. Hysteresis vs. Temperature for SU1--Low to High Figure 4. Hysteresis vs. Temperature for SU2--High to Low 0.5 0.12 0.4 HYSTERESIS - Volts HYSTERESIS - Volts 0.1 0.08 0.3 0.06 0.2 0.04 0.1 0.02 0 -30 -20 0 15 25 35 45 55 TEMPERATURE - C 65 75 85 0 -30 -20 0 15 25 35 45 55 TEMPERATURE - C 65 75 85 Figure 2. Hysteresis vs. Temperature for SU1--High to Low Figure 5. Hysteresis vs. Temperature for SU3--Low to High 0.2 0.14 0.12 0.15 HYSTERESIS - Volts HYSTERESIS - Volts 0.1 0.08 0.06 0.04 0.1 0.05 0.02 0 -30 0 -30 -20 0 15 25 35 45 55 TEMPERATURE - C 65 75 85 -20 0 15 25 35 45 55 TEMPERATURE - C 65 75 85 Figure 3. Hysteresis vs. Temperature for SU2--Low to High Figure 6. Hysteresis vs. Temperature for SU3--High to Low -6- REV. 0 ADM9264 0.12 60 50 TRIP POINT VARIATION - mV 0.1 40 30 20 10 0 -10 -20 HYSTERESIS - Volts 0.08 0.06 0.04 0.02 0 -30 -20 0 15 25 35 45 55 TEMPERATURE - C 65 75 85 -30 -20 0 20 40 60 TEMPERATURE - C 80 100 Figure 7. Hysteresis vs. Temperature for SU4--Low to High Figure 10. Variation of SU1 Low Trip Point With Temperature 0.12 60 50 TRIP POINT VARIATION - mV 0.1 40 30 20 10 0 -10 -20 HYSTERESIS - Volts 0.08 0.06 0.04 0.02 0 -30 -20 0 15 25 35 45 55 TEMPERATURE - C 65 75 85 -30 -20 0 20 40 60 TEMPERATURE - C 80 100 Figure 8. Hysteresis vs. Temperature for SU4--High to Low Figure 11. Variation of SU2 High Trip Point With Temperature 60 50 60 50 TRIP POINT VARIATION - mV TRIP POINT VARIATION - mV 40 30 20 10 0 -10 -20 -30 -20 40 30 20 10 0 -10 -20 -30 -20 0 20 40 60 TEMPERATURE - C 80 100 0 20 40 60 TEMPERATURE - C 80 100 Figure 9. Variation of SU1 High Trip Point With Temperature Figure 12. Variation of SU2 Low Trip Point With Temperature REV. 0 -7- ADM9264 60 50 60 50 TRIP POINT VARIATION - mV TRIP POINT VARIATION - mV 40 30 20 10 0 -10 -20 -30 -20 40 30 20 10 0 -10 -20 -30 -20 0 20 40 60 TEMPERATURE - C 80 100 0 20 40 60 TEMPERATURE - C 80 100 Figure 13. Variation of SU3 High Trip Point With Temperature Figure 16. Variation of SU4 Low Trip Point With Temperature 60 50 308 306 TRIP POINT VARIATION - mV INPUT RESISTANCE - k 40 30 20 10 0 -10 304 302 300 298 -20 -30 -20 296 0 20 40 60 TEMPERATURE - C 80 100 0 10 20 30 40 50 60 70 TEMPERATURE - C 80 90 100 Figure 14. Variation of SU3 Low Trip Point With Temperature Figure 17. SU1 Input Resistance vs. Temperature 60 50 132 130 TRIP POINT VARIATION - mV 40 INPUT RESISTANCE - k 30 20 10 0 -10 128 126 124 122 -20 -30 -20 120 0 20 40 60 TEMPERATURE - C 80 100 0 10 20 30 40 50 60 70 TEMPERATURE - C 80 90 100 Figure 15. Variation of SU4 High Trip Point With Temperature Figure 18. SU2 Input Resistance vs. Temperature -8- REV. 0 ADM9264 90 30 88 INPUT RESISTANCE - k SUPPLY CURRENT - A 25 86 20 84 15 82 10 80 5 78 0 10 20 30 40 50 60 70 TEMPERATURE - C 80 90 100 0 -30 -20 0 15 25 35 45 55 TEMPERATURE - C 65 75 85 Figure 19. SU3 Input Resistance vs. Temperature Figure 21. Supply Current vs. Temperature 74 100 90 72 80 INPUT RESISTANCE - k 70 GLITCH WIDTH - s 0 10 20 30 40 50 60 70 TEMPERATURE - C 80 90 100 70 60 50 40 30 20 10 68 66 64 62 0 0 100 200 300 400 500 600 700 GLITCH AMPLITUDE - mV 800 900 1000 Figure 20. SU4 Input Resistance vs. Temperature Figure 22. Glitch Immunity REV. 0 -9- ADM9264 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 RSET 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. 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 individually 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. Alternatively, the PWROK output can be used alone to give a nonspecific failure indication. VCC 10k PSU #1 12V SU1 ERR1 VCC 10k PSU #2 5V SU2 ERR2 VCC 10k PSU #3 3.3V SU3 ERR3 VCC 10k PSU #4 2.8V SU4 ERR4 SUPER I/O CHIP MICROPROCESSOR FAN (ALARM MONITOR) VCC ERRX ADM9264 6 7 AD22105 RSET 3 TEMPERATURE SENSOR 1 2 ERRY DIS SU4DET Figure 23. Typical Application of ADM9264 -10- REV. 0 ADM9264 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 16-Lead Narrow SOIC (R-16A) 0.3937 (10.00) 0.3859 (9.80) 16 1 9 8 0.1574 (4.00) 0.1497 (3.80) 0.2440 (6.20) 0.2284 (5.80) PIN 1 0.0098 (0.25) 0.0040 (0.10) 0.0688 (1.75) 0.0532 (1.35) 0.0196 (0.50) x 45 0.0099 (0.25) SEATING PLANE 0.0500 (1.27) BSC 0.0192 (0.49) 0.0138 (0.35) 0.0099 (0.25) 0.0075 (0.19) 8 0 0.0500 (1.27) 0.0160 (0.41) REV. 0 -11- -12- C3040-10-4/97 PRINTED IN U.S.A. |
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