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| Preliminary Technical Data FEATURES Low Voltage, High Accuracy, Quad Voltage P Supervisory Circuit ADM6710 FUNCTIONAL BLOCK DIAGRAM IN1 Accurate monitoring of up to four power supply voltages 5 reset threshold options: 1.8 V to 5 V Monitors down to 0.62 V (1.5% accuracy) 200 ms typical reset timeout Open-drain RESET output (10 A internal pull-up) Reset output stage: active low, valid to IN1 = 1 V or IN2 = 1 V Low power consumption (35 A) Power supply glitch immunity Specified from -40 C to +85 C 6-lead SOT-23 package ADM6710 IN2, VCC IN2, VCC RESET 200ms TIMEOUT IN3 UVLO IN4 06626-001 APPLICATIONS Microprocessor systems Desktop and notebook computers Controllers Data storage equipment Servers/workstations 0.62V REF Figure 1. GENERAL DESCRIPTION The ADM6710 is a low voltage, high accuracy supervisory circuit. This device monitors up to four system supply voltages. If a monitored power supply voltage falls below the minimum voltage threshold, a single active low output asserts, triggering a system reset. The output is open drain with a weak internal pull-up to the monitored IN2 supply (or to VCC in the case of the ADM67109Q) of typically 10 A. Once all voltages rise above the selected threshold level, the reset signal remains low for the reset timeout period (200 ms typical). The ADM6710 output remains valid as long as IN1 or IN2 exceeds 1V, while for the ADM6710Q the output remains valid as long as VCC exceeds 2 V. The ADM6710 incorporates a variety of internally pretrimmed undervoltage threshold options for monitoring 5.0 V, 3.3 V, 3.0 V, 2.5 V and 1.8 V supply voltages. The device offers up to three adjustable thresholds for monitoring voltages down to 0.62 V. The ADM6710 is available in a 6-lead SOT-23 package and is suitable for use in a variety of voltage monitoring applications. Rev. PrB 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 rights 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 (c)2007 Analog Devices, Inc. All rights reserved. ADM6710 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Specifications..................................................................................... 3 Absolute Maximum ratings............................................................. 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Preliminary Technical Data Theory of Operation .........................................................................6 Input Configuration......................................................................6 Reset Output Configuration ........................................................6 Addition Of Manual Reset ...........................................................7 Outline Dimensions ..........................................................................8 Ordering Guide .............................................................................8 Rev. PrB | Page 2 of 8 Preliminary Technical Data SPECIFICATIONS VIN2 = 1 V to 5.5 V, TA = -40C to 85C, unless otherwise stated. Typical values are VIN2 =3.0 V to 3.3 V, TA = +25C. Table 1. Parameter VCC OPERATING VOLTAGE RANGE1 VIN2 OPERATING VOLTAGE RANGE2 INX, INPUT CURRENT Min 2.0 1.0 1.2 Typ Max 5.5 5.5 5.5 40 115 Units V V V A A ADM6710 25 55 ICC INPUT CURRENT THRESHOLD VOLTAGE (VTH) ADJUSTABLE THRESHOLD (VTH) RESET THRESHOLD HYSTERESIS (VHYST) RESET THRESHOLD TEMPERATURE COEFFICIENT (TCVTH) INX to RESET DELAY (tRP) RESET TIMEOUT PERIOD (tRP) RESET OUTPUT LOW (VOL) 4.50 4.25 3.00 2.85 2.70 2.55 2.25 2.13 1.62 1.53 0.611 35 4.63 4.38 3.08 2.93 2.78 2.63 2.32 2.19 1.67 1.58 0.620 0.3 60 30 200 0.4 0.2 50 4.75 4.50 3.15 3.00 2.85 2.70 2.38 2.25 1.71 1.62 0.629 A A V V V V V V V V V V V %VTH ppm/C s ms V V V V V A Test Conditions ADM6710Q only All devices except ADM6710Q; TA = 0C to +85C All devices except ADM6710Q; TA = -40C to +85C INX = nominal input voltage (for 1.8 V, 2.5 V and 5.0 V supplies) IN2 = nominal input voltage (for 3.0 V and 3.3 V supplies). The supply splits into 25 A for the resistor divider and 30 A for other circuits. VIN1 = 0 to 0.85 V (for adjustable thresholds) VIN3, V IN4 = 0 to .85 V (for adjustable thresholds) ADM6710Q only; VCC = 5.5 V INX decreasing; 5 V (-5%) INX decreasing; 5 V (-10%) INX decreasing; 3.3 V (-5%) INX decreasing; 3.3 V (-10%) INX decreasing; 3.0 V (-5%) INX decreasing; 3.0 V (-10%) INX decreasing; 2.5 V (-5%) INX decreasing; 2.5 V (-10%) INX decreasing; 1.8 V (-5%) INX decreasing; 1.8 V (-10%) INX decreasing INX increasing relative to INX decreasing VIN falling at 10 mV/s from VTH to VTH - 50 mV VIN2, VCC = 5 V, ISINK = 2 mA VIN2, VCC = 2.5 V, ISINK = 1.2 mA VIN2 = 1.0 , ISINK = 50 A, TA = 0 C to +85 C VCC 2.0 V, ISOURCE=6 A, RESET deasserted (ADM6710Q only) VIN2 2.0 V, ISOURCE=6 A, RESET deasserted VIN2 2.0 V, RESET deasserted 140 280 0.3 0.4 0.3 RESET OUTPUT HIGH (VOH) RESET OUTPUT HIGH SOURCE CURRENT (IOH) 1 2 0.8 x VCC 0.8 x VCC 10 Note that the ADM6710Q is powered from VCC. The RESET output is guaranteed to be in the correct state for IN1 or IN2 down to 1 V. Rev. PrB | Page 3 of 8 ADM6710 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter VCC, INX, RESET to GND Continuous RESET Current Continuous Power Dissipation Storage Temperature Range Operating Temperature Range Lead Temperature (10 sec) Junction Temperature Rating -0.3 V to +6 V 20 mA 450 mW -65C to +125C -40C to +85C 300C 150C Preliminary Technical Data Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and 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. ESD CAUTION Rev. PrB | Page 4 of 8 Preliminary Technical Data PIN CONFIGURATION AND FUNCTION DESCRIPTIONS IN1 1 6 ADM6710 RESET GND 06626-002 IN1 1 6 RESET GND IN4 06626-003 ADM6710 IN2 2 IN3 3 TOP VIEW (Not to Scale) 5 ADM6710Q VCC 2 IN3 3 TOP VIEW (Not to Scale) 5 4 IN4 4 Figure 2. Table 3. Pin Function Descriptions Pin No. 1 2 3 4 5 6 Mneumonic IN1 IN2 VCC IN3 IN4 GND RESET Description Input Voltage 1. Input Voltage 2. IN2 is the power supply input for the ADM6710. VCC is the power supply input for the ADM6710Q. It is not a monitored input. Input Voltage 3. Input Voltage 4. Ground. RESET goes low when an input drops below the specified threshold. Once all inputs rise above the threshold voltage, RESET remains low for 200 ms (typical) before going high. The RESET output is open drain with a weak internal pull-up to IN2 or, in the case of the ADM6710Q to VCC, typically 10 A. Rev. PrB | Page 5 of 8 ADM6710 THEORY OF OPERATION The ADM6710 is a compact, low power supervisory circuit capable of monitoring up to four voltages in multivoltage applications. If a monitored power supply voltage falls below the minimum voltage threshold, a single active low output asserts, triggering a system reset. The ADM6710 includes several voltage threshold options for monitoring 5.0 V, 3.3 V, 3.0 V, 2.5 V and 1.8 V supplies. It also provides up to three adjustable thresholds for monitoring voltages down to 0.62 V. See the Ordering Guide section for a list and description of all options available. The ADM6710 includes precision comparators, an accurate band gap reference, and a series of internally-trimmed resistor divider networks to set the factory-fixed reset threshold options. The resistor networks scale the specified INx reset voltages to match the internal band gap reference/comparator voltage. Adjustable threshold options bypass the internal resistor networks and connect directly to one of the comparator inputs. External resistor divider networks must be used to scale voltages down for monitoring at the adjustable inputs. The ADM6710Q provides a separate unmonitored power supply input (VCC) and three adjustable voltage inputs. The internal comparators each typically have a hysteresis of 0.3% with respect to its reset threshold. This built-in hysteresis improves the device's immunity to ambient noise without noticeably reducing the threshold accuracy. The ADM6710 is unaffected by short input transients. ADM6710 IN1 MONITORED SUPPLIES IN2 IN3 IN4 GND 06626-004 Preliminary Technical Data VINTH R1 R2 06626-006 VREF = 0.62V Figure 4. Setting the Adjustable Monitor The ADM6710Q contains an internal voltage clamp at each of the adjustable voltage inputs. Input voltages greater than 1.5 V induce a higher input current. The ADM6710 is normally powered from the monitored IN2, or VCC in the case of the ADM6710Q. Monitored inputs are resistant to short power supply glitches. To increase noise immunity in noisy applications, place a 0.1 F capacitor between the IN2 input and ground. Adding capacitance to IN1, IN3, and IN4 also improves noise immunity. Do not allow unused monitor inputs to float or to be grounded. Connect these inputs to a supply voltage greater than their specified threshold voltages. In the case of unused INx adjustable inputs, limit the bias current by connecting a 1 M series resistor between the unused input and IN2 (or VCC with the ADM6710Q). RESET OUTPUT CONFIGURATION The ADM6710 has a reset timeout period of 200 ms (typical). The output is open drain with a weak internal pull-up to the monitored IN2 or VCC supply, typically 10 uA. In many applications that interface with other logic devices, there is no requirement for an external pull-up resistor. An external pull-up resistor to any voltage, ranging from 0 V to 5.5 V, can overdrive the internal pull-up when interfacing to different logic supply voltages (see Figure 5). Reverse current flow from the external pull-up voltage to IN2 is prevented by the internal circuitry. IN2=3.3V 5V RESET MICROPROCESSOR Figure 3. Typical Applications Circuit INPUT CONFIGURATION The ADM6710 provides numerous monitor choices with adjustable reset thresholds. Typically, the threshold voltage at each adjustable INx input is 0.62 V. To monitor a voltage greater than 0.62 V, connect a resistor divider network to the circuit as depicted in Figure 4, where R + R2 VINTH = 0.62 V 1 R 2 ADM6710 RESET 100k VCC RESET Figure 5. Interface with a Different Logic Supply Voltage The ADM6710Q is powered by VCC, which is not a monitored voltage. All other ADM6710 options are powered by IN2, which is a monitored voltage. If a supply voltage drops below its associated threshold, the reset output asserts low and remains low while either IN1 or IN2 remains above 1.0 V. Rev. PrB | Page 6 of 8 06626-005 Preliminary Technical Data ADDITION OF MANUAL RESET ADM6710 VIN4 R1 IN1 IN2 IN3 IN4 R2 GND 06626-007 ADM6710 Use the circuit shown in Figure 6 to add a manual reset to the ADM6710. When the switch is closed, the analog input shorts to ground and a RESET output commences. The switch must remain open for a minimum of 140 ms for the RESET output to deassert. RESET Figure 6. Addition of Manual Reset (IN4 is an Adjustable Input). ADM6710 OUTLINE DIMENSIONS 2.90 BSC 6 5 4 Preliminary Technical Data 1.60 BSC 1 2 3 2.80 BSC PIN 1 INDICATOR 0.95 BSC 1.30 1.15 0.90 1.90 BSC 1.45 MAX 0.50 0.30 0.22 0.08 10 4 0 0.60 0.45 0.30 0.15 MAX SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-178-AB Figure 7. 6-Lead Small Outline Transistor Package [SOT-23] (RJ-6) Dimensions shown in millimeters ORDERING GUIDE Model ADM6710AARJZ-REEL71 ADM6710BARJZ-REEL71 ADM6710CARJZ-REEL71 ADM6710DARJZ-REEL71 ADM6710EARJZ-REEL71 ADM6710FARJZ-REEL71 ADM6710GARJZ-REEL71 ADM6710HARJZ-REEL71 ADM6710IARJZ-REEL71 ADM6710JARJZ-REEL71 ADM6710KARJZ-REEL71 ADM6710LARJZ-REEL71 ADM6710MARJZ-REEL71 ADM6710NARJZ-REEL71 ADM6710OARJZ-REEL71 ADM6710PARJZ-REEL71 ADM6710QARJZ-REEL71 1 2 Nominal Input Voltage IN1 IN2 IN3 IN4 5 3.3 2.5 Adj.2 5 3.3 2.5 Adj.2 5 3.3 1.8 Adj.2 5 3.3 1.8 Adj.2 2 Adj. 3.3 2.5 1.8 Adj.2 3.3 2.5 1.8 5 3.3 Adj.2 Adj.2 5 3.3 Adj.2 Adj.2 2 Adj. 3.3 2.5 Adj.2 2 Adj. 3.3 2.5 Adj.2 2 Adj. 3.3 1.8 Adj.2 2 Adj. 3.3 1.8 Adj.2 2 Adj. 3 2.5 Adj.2 2 Adj. 3 2.5 Adj.2 2 Adj. 3 1.8 Adj.2 2 Adj. 3 1.8 Adj.2 2 2 Adj. VCC Adj. Adj.2 Supply Tolerance (%) 10 5 10 5 10 5 10 5 10 5 10 5 10 5 10 5 N/A Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 6-Lead SOT-23 Package Option RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 RJ-6 Branding MA9 MAH MAJ MAK MAX MA4 MAL MAM MAN MAP MAQ MAR MAS MAT MAU MAV MAW Z = RoHS Compliant Part. Adjustable voltage based on 0.62 V internal threshold. The external threshold voltage can be set using an external resistor divider. (c)2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR06626-0-3/07(PrB) Rev. PrB | Page 8 of 8 |
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