Low Voltage, High Accuracy, Triple/Quad Voltage Microprocessor Supervisory Circuit ADM6710 FEATURES Accurate monitoring of up to four power supply voltages 5 factory-set threshold options: 1.8 V, 2.5 V, 3.0 V, 3.3 V, 5 V Adjustable input threshold voltage = 0.62 V (1.5% accuracy) 200 ms typical reset timeout Open-drain RESET output (10 μA internal pull-up) Reset output stage: active low, valid to IN1 = 1 V or IN2 = 1 V Low power consumption (35 μA) Power supply glitch immunity Specified from −40°C to +85°C 6-lead SOT-23 package FUNCTIONAL BLOCK DIAGRAM IN1 ADM6710 IN2, VCC IN2, VCC RESET 200ms TIMEOUT IN3 UVLO IN4 Telecommunications Microprocessor systems Desktop and notebook computers Data storage equipment Servers/workstations 06626-001 APPLICATIONS 0.62V REF Figure 1. GENERAL DESCRIPTION The ADM6710 is a low voltage, high accuracy supervisory circuit. The device monitors up to four system supply voltages. The ADM6710 incorporates a variety of internally pretrimmed undervoltage threshold options for monitoring 1.8 V, 2.5 V, 3.0 V, 3.3 V and 5.0 V supply voltages. The ADM6710Q offers three adjustable thresholds for monitoring voltages down to 0.62 V. See the Ordering Guide section for a list and description of all available options. 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 ADM6710Q) of typically 10 μA. 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 1 V, whereas for the ADM6710Q, the output remains valid as long as VCC exceeds 2 V. Unused monitored inputs should not be allowed to float or to be grounded, instead they should be connected to a supply voltage greater than their specified threshold voltages. The ADM6710 is available in a 6-lead SOT-23 package. The device operates over the extended temperature range of −40°C to +85°C. Rev. A 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 ©2007–2010 Analog Devices, Inc. All rights reserved. ADM6710 TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................6 Applications ....................................................................................... 1 Theory of Operation .........................................................................8 Functional Block Diagram .............................................................. 1 Input Configuration ......................................................................8 General Description ......................................................................... 1 RESET Output Configuration .....................................................8 Revision History ............................................................................... 2 Addition Of Manual Reset ...........................................................8 Specifications..................................................................................... 3 Outline Dimensions ..........................................................................9 Absolute Maximum Ratings............................................................ 4 Ordering Guide .............................................................................9 ESD Caution .................................................................................. 4 Pin Configurations and Function Descriptions ........................... 5 REVISION HISTORY 10/10—Rev. 0 to Rev. A Added Figure 17................................................................................ 9 6/07—Revision 0: Initial Version Rev. A | Page 2 of 12 ADM6710 SPECIFICATIONS VIN2 = 1 V to 5.5 V, TA = −40°C to +85°C, unless otherwise noted. Typical values are VIN2 = 3.0 V to 3.3 V, TA = 25°C. Table 1. Parameter OPERATING VOLTAGE RANGE VCC 1 VIN2 2 Min 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) RESET OUTPUT HIGH (VOH) Max Units Test Conditions/Comments 5.5 5.5 5.5 V V V ADM6710Q only All devices except ADM6710Q; TA = 0°C to +85°C All devices except ADM6710Q; TA = −40°C to +85°C 25 40 μA 55 115 μA 35 0.4 0.2 50 μA μA μA 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 μA for the resistor divider and 30 μA for other circuits VIN1 = 0 V to 0.85 V (for adjustable thresholds) VIN3, V IN4 = 0 V to 0.85 V (for adjustable thresholds) ADM6710Q only; VCC = 5.5 V 4.75 4.50 3.15 3.00 2.85 2.70 2.38 2.25 1.71 1.62 0.629 V V V V V V V V V V V %VTH ppm/°C 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 μs ms V V V V VIN falling at 10 mV/μs from VTH to VTH − 50 mV 2.0 1.0 1.2 INPUT CURRENT INx Input Current ICC Input Current THRESHOLD VOLTAGE Threshold Voltage (VTH) Typ 4.50 4.25 3.00 2.85 2.70 2.55 2.25 2.13 1.62 1.53 0.611 140 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 30 200 280 0.3 0.4 0.3 0.8 × VCC 0.8 × VIN2 RESET OUTPUT HIGH SOURCE CURRENT (IOH) 1 2 V 10 μA 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. A | Page 3 of 12 VIN2, VCC = 5 V, ISINK = 2 mA VIN2, VCC = 2.5 V, ISINK = 1.2 mA VIN2 = 1.0 , ISINK = 20 μA, TA = 0°C to +85°C VCC ≥ 2.0 V, ISOURCE = 4 μA, RESET deasserted (ADM6710Q only) VIN2 ≥ 2.0 V, ISOURCE = 4 μA, RESET deasserted VIN2 ≥ 2.0 V, RESET deasserted ADM6710 ABSOLUTE MAXIMUM RATINGS Table 3. Thermal Resistance Table 2. Parameter VCC, INX, RESET to GND Continuous RESET Current Storage Temperature Range Operating Temperature Range Lead Temperature (10 sec) Junction Temperature Package Type 6-lead SOT-23 Rating −0.3 V to +6 V 20 mA −65°C to +125°C −40°C to +85°C 300°C 135°C ESD CAUTION 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. Rev. A | Page 4 of 12 θJA 169.5 Unit °C/W ADM6710 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS 6 RESET IN1 1 ADM6710 TOP VIEW (Not to Scale) IN3 3 5 GND 4 IN4 VCC 2 06626-002 IN2 2 6 RESET 5 GND 4 IN4 ADM6710Q IN3 3 Figure 2. ADM6710 Pin Configuration TOP VIEW (Not to Scale) 06626-003 IN1 1 Figure 3. ADM6710Q Pin Configuration Table 4. Pin Function Descriptions Pin No. 1 2 3 4 5 6 Mnemonic 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. Active Low RESET Output. 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. RESET is open drain with a weak internal pull-up to IN2 or, in the case of the ADM6710Q, to VCC, typically 10 μA. Rev. A | Page 5 of 12 ADM6710 TYPICAL PERFORMANCE CHARACTERISTICS VIN2 = VCC = 3.0V, TA = 25°C, unless otherwise noted. 100 58 IN2 INPUT CURRENT (µA) 56 54 52 50 48 46 44 06626-008 VIN2 = 3.3V 42 VIN2 = 3V 40 –40 –15 10 35 90 80 70 60 50 40 30 RESET ASSERTED ABOVE THIS LINE 20 10 0 85 60 06626-011 MAXIMUM INX TRANSIENT DURATION (µs) 60 0 100 TEMPERATURE (ºC) 200 300 400 500 600 700 800 900 1000 RESET THRESHOLD OVERDRIVE (mV) Figure 4. IN2 Input Current vs. Temperature Figure 7. Maximum INx Transient Duration vs. Reset Threshold Overdrive 100 120 90 80 RESET DELAY (µs) 80 60 40 70 60 50 40 30 20 06626-009 20 0 0 .5 1 1.5 2 2.5 3 3.5 4 4.5 5 06626-012 IN2 INPUT CURRENT (µA) 100 10 0 0 5.5 200 300 400 500 600 700 800 900 1000 Figure 8. RESET Delay vs. Reset Threshold Overdrive (INx Decreasing) Figure 5. IN2 Input Current vs. IN2 Voltage 214 0.05 0 RESET TIMEOUT DELAY (mS) 212 –0.05 –0.1 –0.15 –0.2 –0.25 210 208 206 –0.35 –40 VTH = 1.8V VIN2 = 3.3V –15 10 35 60 202 –40 85 06626-013 204 –0.3 06626-010 NORMALIZED THERSHOLD ERROR (%) 100 RESET THRESHOLD OVERDRIVE (mV) IN2 VOLTAGE (V) –15 10 35 60 TEMPERATURE (ºC) TEMPERATURE (ºC) Figure 6. Normalized Threshold Error vs. Temperature Figure 9. Reset Timeout Delay vs. Temperature Rev. A | Page 6 of 12 85 ADM6710 INx C3 INx C3 RESET RESET C2 BwL DC1M C3 BwL DC1M 2.00V/div 1.00V/div –6.000V offset 2.040V offset Timebase 0.0µs Trigger 0.0µs 10.0 µs/div STOP –520mV 200kS 2.0 GS/s EDGE NEGATIVE 06626-015 C2 06626-014 C2 C2 BwL DC1M C3 BwL DC1M 2.00V/div 2.00V/div –6.000V offset 2.000V offset Figure 10. RESET Pull-Up and Pull-Down Response (10 μs/div) Timebase –101ms Trigger C3 DC 50.0 ms/div Normal 680mV Positive 1.0 MS/s Edge 500kS Figure 11. RESET Timeout Delay (50 ms/div) Rev. A | Page 7 of 12 ADM6710 THEORY OF OPERATION Adding capacitance to IN1, IN3, and IN4 also improves noise immunity. The ADM6710 is a compact, low power supervisory circuit capable of monitoring up to four voltages in a multisupply application. The device includes several factory-set voltage threshold options for monitoring 1.8 V, 2.5 V, 3.0 V, 3.3 V and 5.0 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 available options. The ADM6710Q has three adjustable voltage inputs and is powered by VCC, which is not a monitored voltage. All other ADM6710 devices are powered by IN2, which is a monitored voltage, and therefore monitors up to four voltages. If a monitored voltage drops below its associated threshold, the active low reset output asserts low and remains low while either IN1 or IN2 remains above 1.0 V. ADM6710 IN1 IN2 IN3 RESET MICROPROCESSOR The RESET output asserts low if a monitored INx voltage drops below its voltage threshold. Once all voltages rise above the selected threshold level, the reset signal remains low for the reset timeout period (200 ms typical). The reset output is open drain with a weak internal pull-up to the monitored IN2 or VCC supply, typically 10 μA. Many applications that interface with other logic devices do not require an external pull-up resistor. However, if an external pull-up resistor is required and it is connected to a voltage ranging from 0 V to 5.5 V, it will overdrive the internal pull-up. Reverse current flow from the external pull-up voltage to IN2 is prevented by the internal circuitry. 06626-004 IN4 RESET OUTPUT CONFIGURATION GND 5V IN2=3.3V Figure 12. Typical Applications Circuit ADM6710 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 13, where VINTH ⎛ R + R2 ⎞ ⎟ = 0.62 V ⎜⎜ 1 ⎟ ⎝ R2 ⎠ VCC 100kΩ RESET 06626-005 RESET Figure 14. Interface with a Different Logic Supply Voltage ADDITION OF MANUAL RESET Use the circuit shown in Figure 15 to add manual reset to any of the ADM6710 adjustable inputs. 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. VINTH R1 VREF = 0.62V 06626-006 R2 ADM6710 VIN4 Figure 13. Setting the Adjustable Monitor IN1 IN2 The internal comparators each typically have a hysteresis of 0.3% with respect to the 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. The ADM6710 is powered from the monitored IN2, or VCC in the case of the ADM6710Q. Monitored inputs are resistant to short power supply glitches. Figure 7 depicts the ADM6710 glitch immunity data. To increase noise immunity in noisy applications, place a 0.1 μF capacitor between the IN2 input and ground. Rev. A | Page 8 of 12 R1 IN3 RESET IN4 GND R2 06626-007 MONITORED SUPPLIES 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 MΩ series resistor between the unused input and IN2 (or VCC in the case of the ADM6710Q). Figure 15. Addition of Manual Reset (IN4 is an Adjustable Input) ADM6710 OUTLINE DIMENSIONS 2.90 BSC 6 5 4 1 2 3 2.80 BSC 1.60 BSC PIN 1 INDICATOR 0.95 BSC 1.90 BSC 1.30 1.15 0.90 1.45 MAX 0.50 0.30 0.15 MAX 0.22 0.08 10° 4° 0° SEATING PLANE 0.60 0.45 0.30 COMPLIANT TO JEDEC STANDARDS MO-178-AB Figure 16. 6-Lead Small Outline Transistor Package [SOT-23] (RJ-6) Dimensions shown in millimeters ROUND SPROCKET HOLES 06626-016 PIN 1 MARKER DIRECTION OF FEED Figure 17. ADM6710 Reel Orientation ORDERING GUIDE Model 1, 2 ADM6710AARJZ-REEL7 ADM6710BARJZ-REEL7 ADM6710CARJZ-REEL7 ADM6710DARJZ-REEL7 ADM6710EARJZ-REEL7 ADM6710FARJZ-REEL7 ADM6710GARJZ-REEL7 ADM6710HARJZ-REEL7 ADM6710IARJZ-REEL7 ADM6710JARJZ-REEL7 ADM6710KARJZ-REEL7 ADM6710LARJZ-REEL7 ADM6710MARJZ-REEL7 ADM6710NARJZ-REEL7 ADM6710OARJZ-REEL7 ADM6710PARJZ-REEL7 ADM6710QARJZ-REEL7 1 2 Nominal Input Voltage IN1 IN2 IN3 IN4 5 3.3 2.5 Adj. 5 3.3 2.5 Adj. 5 3.3 1.8 Adj. 5 3.3 1.8 Adj. Adj. 3.3 2.5 1.8 Adj. 3.3 2.5 1.8 5 3.3 Adj. Adj. 5 3.3 Adj. Adj. Adj. 3.3 2.5 Adj. Adj. 3.3 2.5 Adj. Adj. 3.3 1.8 Adj. Adj. 3.3 1.8 Adj. Adj. 3 2.5 Adj. Adj. 3 2.5 Adj. Adj. 3 1.8 Adj. Adj. 3 1.8 Adj. Adj. VCC Adj. Adj. Supply Tolerance (%) 10 5 10 5 10 5 10 5 10 5 10 5 10 5 10 5 Not applicable Temperature Range −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C −40°C to +85°C 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 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. Rev. A | Page 9 of 12 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 ADM6710 NOTES Rev. A | Page 10 of 12 ADM6710 NOTES Rev. A | Page 11 of 12 ADM6710 NOTES ©2007–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06626-0-10/10(A) Rev. A | Page 12 of 12