ADM6339DARJZ-RL7

Quad Voltage Microprocessor Supervisory Circuit ADM6339 FEATURES FUNCTIONAL BLOCK DIAGRAM IN1 5V PULLUP IN2 IN1 IN2 RESET 200ms TIMEOUT IN3 IN4 ADM6339 VREF 08169-001 Accurate monitoring of up to four power supply voltages 6 factory-set threshold options: −5.0 V, +1.8 V, +2.5 V, +3.0 V, +3.3 V, and +5.0 V Adjustable input threshold options: −0.5 V (±2.0% accuracy), +0.62 V (±0.8% accuracy), and +1.23 V 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 (55 μA) Glitch immunity Specified from −40°C to +85°C 6-lead SOT-23 package Figure 1. APPLICATIONS Telecommunications Microprocessor systems Data storage equipment Servers/workstations GENERAL DESCRIPTION The ADM6339 is a high accuracy supervisory circuit capable of monitoring up to four system supply voltages. The ADM6339 incorporates a variety of internally pretrimmed undervoltage threshold options for monitoring −5.0 V, +1.8 V, +2.5 V, +3.0 V, +3.3 V, and +5.0 V supply voltages. Tolerance levels of ±5% and ±10% are available. The device is also available with one to three adjustable threshold options. The adjustable voltage threshold options are +1.23 V, +0.62 V, and −0.5 V. See the Ordering Guide section for a list and description of all available options. If a monitored power supply voltage decreases below the minimum voltage threshold (or rises above the maximum voltage threshold for the −0.5 V and −5.0 V input options), 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 of typically 10 μA. After all voltages exceed the selected threshold level, the reset signal remains low for the reset timeout period (200 ms typical). The ADM6339 output remains valid as long as IN1 or IN2 exceeds 1 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 ADM6339 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 ©2009–2010 Analog Devices, Inc. All rights reserved. ADM6339 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 Monitoring Negative Voltages < −5.0 V .....................................8 Revision History ............................................................................... 2 User Adjustable Threshold Options ...........................................8 Specifications..................................................................................... 3 RESET Output Configuration .....................................................9 Absolute Maximum Ratings............................................................ 4 Outline Dimensions ....................................................................... 10 ESD Caution .................................................................................. 4 Ordering Guide .......................................................................... 10 Pin Configuration and Function Descriptions ............................. 5 REVISION HISTORY 10/10—Rev. 0 to Rev. A Added Figure 19.............................................................................. 10 6/09—Revision 0: Initial Version Rev. A | Page 2 of 12 ADM6339 SPECIFICATIONS VIN2 = 1.0 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 (VIN2) 1 , 2 INPUT CURRENT INx Input Current Min 1.0 Typ Max 5.5 Units V Test Conditions/Comments 25 55 40 115 μA μA μA μA μA μA μA VINx = nominal input voltage for 1.8 V, 2.5 V, and 5.0 V supplies. VIN2 = nominal input voltage for 3.0 V and 3.3 V supplies. VIN2 is also the device power supply. The supply splits into 25 μA for the resistor divider and 30 μA for other circuits. VINx = 0 V to VIN2 (input threshold voltage = 1.23 V). VIN1 = 1.5 V (ADM6339K and ADM6639L models only). VINx = −5.0 V (INx input threshold voltage = −5.0 V). VINx = 0.62 V (INx input threshold voltage = 0.62 V). VINx = −0.5 V (INx input threshold voltage = −0.5 V). 5.0 V (−5% tolerance) threshold. 5.0 V (−10% tolerance) threshold. 3.3 V (−5% tolerance) threshold. 3.3 V (−10% tolerance) threshold. 3.0 V (−5% tolerance) threshold. 3.0 V (−10% tolerance) threshold. 2.5 V (−10% tolerance) threshold. 1.8 V (−10% tolerance) threshold. −5.0 V (+5% tolerance) threshold. −5.0 V (+10% tolerance) threshold. −0.1 −0.1 −1 −3 +0.1 1.5 −20 +0.1 −5 4.50 4.25 3.00 2.85 2.70 2.55 2.13 1.53 −4.75 −4.50 4.63 4.38 3.08 2.93 2.78 2.63 2.19 1.58 −4.63 −4.38 4.75 4.50 3.15 3.00 2.85 2.70 2.25 1.62 −4.50 −4.25 V V V V V V V V V V 1.20 0.615 −0.497 1.23 0.620 −0.487 0.3 0.47 60 1.26 0.625 −0.477 V V V % VTH % VTH ppm/°C 0.4 −15 THRESHOLD VOLTAGE Fixed Threshold Voltage (VTH) VINx Decreasing VINx Increasing Adjustable Threshold Voltage (VTH) VINx Decreasing VINx Increasing RESET THRESHOLD HYSTERESIS (VHYST) RESET THRESHOLD TEMPERATURE COEFFICIENT (TCVTH) INX to RESET DELAY (tRD) 30 RESET TIMEOUT PERIOD (tRP) RESET OUTPUT LOW (VOL) 140 RESET OUTPUT HIGH (VOH) 0.8 × VIN2 RESET OUTPUT HIGH SOURCE CURRENT (IOH) 200 μs 280 0.4 0.4 0.4 0.4 0.4 10 1 The device is powered by Input IN2. 2 The RESET output is guaranteed to be in the correct state for IN1 or IN2 down to 1 V. −0.5 V threshold. IN4, ADM6339Q model. VINx = VTH to (VTH − 50 mV) for all inputs except −0.5 V and −5.0 V; VINx = VTH to (VTH + 50 mV) for −5.0 V and −0.5 V inputs only. ms V V V V V V VIN2 = 5.0 V, ISINK = 2 mA. VIN2 = 2.5 V, ISINK = 1.2 mA. VIN2 = VIN1 = 1 V, ISINK = 50 μA. VIN1 =1V, VIN2 = 0 V, ISINK = 20 μA VIN1 =0 V, VIN2 = 1 V, ISINK = 20 μA VIN2 ≥ 2.55 V, ISOURCE = 6 μA, RESET not asserted. μA VIN2 ≥ 2.55 V, RESET not asserted. Rev. A | Page 3 of 12 ADM6339 ABSOLUTE MAXIMUM RATINGS Table 3. Thermal Resistance Table 2. Parameter VCC, RESET, GND Continuous RESET Current INx (Positive Reset Threshold) IN4 (Negative Reset Threshold, −5 V) IN4 ADM6339Q Model (Negative Reset Threshold, −0.5 V) Storage Temperature Range Operating Temperature Range Lead Temperature (10 sec) Junction Temperature Rating −0.3 V to +6 V 20 mA −0.3 V to +6 V −6 V to +0.3 V −2 V to +0.3 V Package Type 6-Lead SOT-23 ESD CAUTION −65°C to +125°C −40°C to +85°C 300°C 135°C 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 ADM6339 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS IN1 1 6 RESET IN2 2 IN3 3 5 GND TOP VIEW (Not to Scale) 4 IN4 08169-002 ADM6339 Figure 2. Pin Configuration Table 4. Pin Function Descriptions Pin No. 1 2 3 4 5 6 Mnemonic IN1 IN2 IN3 IN4 GND RESET Description Monitored Input Voltage 1. Monitored Input Voltage 2. IN2 is the power supply input for the ADM6339. Monitored Input Voltage 3. Monitored Input Voltage 4. Ground. Active Low RESET Output. RESET goes low when an input drops below the specified threshold (or above in the case of the −0.5 V and −5.0 V input options). After 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, typically 10 μA. Rev. A | Page 5 of 12 ADM6339 TYPICAL PERFORMANCE CHARACTERISTICS VIN2 = VCC = 3.0 V, TA = 25°C, unless otherwise noted. 100 58 IN2 INPUT CURRENT (µA) 56 54 52 50 48 46 44 08169-010 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 08169-012 MAXIMUM INX TRANSIENT DURATION (µs) 60 0 100 TEMPERATURE (ºC) 200 300 400 500 600 700 800 900 1000 RESET THRESHOLD OVERDRIVE (mV) Figure 3. IN2 Input Current vs. Temperature Figure 6. Maximum INx Transient Duration vs. Reset Threshold Overdrive 120 100 90 80 RESET DELAY (µs) 80 60 40 70 60 50 40 30 20 08169-011 20 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 10 0 5.5 5.0 08169-013 IN2 INPUT CURRENT (µA) 100 0 IN2 VOLTAGE (V) 200 300 400 500 600 700 800 900 1000 RESET THRESHOLD OVERDRIVE (mV) Figure 7. RESET Delay vs. Reset Threshold Overdrive (INx Decreasing) Figure 4. IN2 Input Current vs. IN2 Voltage 214 0.05 212 RESET TIMEOUT DELAY (mS) 0 5V –0.05 1.8V –0.10 –0.15 210 208 206 –0.20 –40 –20 0 20 40 60 TEMPERATURE (°C) 80 202 –40 08169-014 204 08169-007 NORMALIZED THRESHOLD ERROR (%) 100 –15 10 35 60 TEMPERATURE (ºC) Figure 8. Reset Timeout Delay vs. Temperature Figure 5. Normalized Threshold Error vs. Temperature Rev. A | Page 6 of 12 85 ADM6339 INx C3 INx C3 RESET RESET 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 2.0 GS/s EDGE NEGATIVE 200kS C2 BwL DC1M C3 BwL DC1M 2.00V/div 2.00V/div –6.000V offset 2.000V offset Figure 9. RESET Pull-Up and Pull-Down Response (10 μs/Div) Figure 11. RESET Timeout Delay (50 ms/Div) –0.490 –0.5V VIN TRIP THRESHOLD (V) 0.625 0.620 0.615 –20 0 20 40 60 80 TEMPERATURE (°C) –0.495 –0.500 –0.505 –0.510 –40 08169-009 0.62V VIN TRIP THRESHOLD (V) 0.630 0.610 –40 Timebase –101ms Trigger C3 DC 50.0 ms/div Normal 680mV Positive 1.0 MS/s Edge 500kS –20 0 20 40 60 80 TEMPERATURE (°C) Figure 10. 0.62 V Input Voltage Trip Threshold vs. Temperature Figure 12. −0.5 V Input Voltage Trip Threshold vs. Temperature Rev. A | Page 7 of 12 08169-008 C2 08169-015 C2 08169-016 C2 ADM6339 THEORY OF OPERATION The device includes several factory-set voltage threshold options for monitoring −5.0 V, +1.8 V, +2.5 V, +3.0 V, +3.3 V, and +5.0 V supplies. The ADM6339 is available with one to three adjustable threshold options. The adjustable voltage threshold options available are +1.23 V, +0.62 V, and −0.5 V. See the Ordering Guide section for a list and description of all available options. INPUT CONFIGURATION Built-in hysteresis improves the ADM6339’s immunity to short input transients, without noticeably reducing the threshold accuracy. The internal comparators each have a hysteresis of 0.3% with respect to the reset threshold voltage. (The IN4 input of the ADM6339Q model has a hysteresis of 0.47% with respect to its reset threshold voltage of −0.487 V.) Monitored inputs are resistant to short power supply glitches. Figure 6 depicts the ADM6339 glitch immunity data. To increase noise immunity in noisy applications, place a 0.1 μF capacitor between the IN2 input and ground. Adding capacitance to IN1, IN3, and IN4 also improves noise immunity. IN1 IN3 RESET where: R2 ≤ 2.49 kΩ. VINTH is the desired threshold voltage. VTH is the internal threshold voltage. For example, when monitoring a nominal voltage of −12 V, VINTH = −11.1 V, VTH = −4.63 V, and R2 = 2.49 kΩ. Therefore, using the previous equation, R1 = 3.48 kΩ. ADM6339 R2 R1 VINTH Figure 14. Negative Voltage Monitoring USER ADJUSTABLE THRESHOLD OPTIONS When using an adjustable threshold of 1.23 V (typical), to monitor a voltage greater than 1.23 V, connect a resistor divider network to the device as shown in Figure 15. VINTH, the desired threshold voltage, can be expressed as MICROPROCESSOR GND 08169-003 IN4 VINTH = 1.23 V((R1 + R2)/(R2)) Figure 13. Typical Applications Circuit IN2 must always be used for normal operation because it is the device’s power supply input. Do not allow unused monitor inputs to float or to be grounded. Unused IN3 or IN4 inputs with positive thresholds can be connected directly to the IN2 input. Unused IN4 options with negative thresholds must be tied to a more negative supply. The ADM6339 has a guaranteed input current of ±0.1 μA on its 1.23 V adjustable input. Resistor values up to 100 kΩ can be used for R2 with