Triple Processor Supervisors ADM13307

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1 Triple Processor Supervisors ADM337 FEATURES Triple supervisory circuits Supply voltage range of 2. V to 5.5 V Pretrimmed threshold options:.8 V, 2.5 V, 3.3 V, and 5 V Adjustable.6 V and.25 V voltage references Maximum supply current of 4 μa 4 ms (minimum) reset timeout valid from VDD. V Push-pull and outputs 8-lead, narrow body SOIC package Temperature range: 4 C to +85 C APPLICATIONS Supervising DSPs/microcontrollers Industrial and portable equipment Wireless systems Notebook/desktop computers GENERAL DESCRIPTION The ADM337 is a triple voltage supervisor designed to monitor up to three voltage levels in DSP and microprocessorbased systems. There are five models available, all of which feature a combination of internally pretrimmed undervoltage threshold options for monitoring.8 V, 2.5 V, 3.3 V, and 5 V supplies. There are also two adjustable input options with undervoltage thresholds of either.6 V or.25 V. The ADM337-8, ADM337-25, and ADM models have two internally fixed thresholds and one externally programmable threshold via a resistor string. The ADM337-4 and ADM337-5 offer one internally fixed threshold and two externally programmable thresholds. See the Ordering Guide for a list of all available options. During power-up, is asserted when the supply voltage exceeds. V. The device then monitors the SENSEv input pins and holds the output low as long as the SENSEv pins remain below the rising threshold voltage, VIT+. Once the supplies monitored at the SENSEv inputs rise above their associated thresholds, the reset signal remains low for the reset timeout period before deasserting. Subsequently, if a voltage monitored by the SENSEv pins falls below its associated falling input threshold voltage, VIT, the output asserts. V DD MR SENSE SENSE2 GND SENSE3 V DD MR SENSE GND SENSE2 SENSE3 FUNCTIONAL BLOCK DIAGRAMS R R3 R 4kΩ.25V 4kΩ.6V R2 R2 R4 Figure. Figure 2. ADM337-8 ADM ADM LOGIC + TIMER OSCILLATOR ADM337-4 ADM337-5 LOGIC + TIMER OSCILLATOR The ADM337 features both an active high and an active low output The manual reset input of the ADM337 can be used to initiate a reset by means of an external push button or logic signal. The ADM337 is available in an 8-lead narrow body SOIC package. The device operates over the extended industrial temperature range of 4 C to +85 C Rev. 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 96, Norwood, MA , U.S.A. Tel: Fax: Analog Devices, Inc. All rights reserved.

2 ADM337 TABLE OF CONTENTS Features... Applications... General Description... Functional Block Diagrams... Revision History... 2 Specifications... 3 Timing Requirements... 5 Switching Characteristics... 5 Functional Truth Table... 5 Absolute Maximum Ratings... 6 Thermal Resistance...6 ESD Caution...6 Pin Configuration and Function Descriptions...7 Typical Performance Characteristics...8 Theory of Operation... Input Configuration... Reset Output... Manual Reset (MR)... Outline Dimensions... Ordering Guide... REVISION HISTORY 8/7 Revision : Initial Version Rev. Page 2 of 2

3 ADM337 SPECIFICATIONS VDD = 2. V to 5.5 V, 4 C TA +85 C, unless otherwise noted. Table. ADM337-8, ADM337-25, and ADM Parameter Min Typ Max Unit Test Conditions/Comments OPERATING VOLTAGE RANGE, VDD V SUPPLY CURRENT, IDD 4 μa INPUT CAPACITANCE, CI pf VI = V to VDD, Output High Level Output Voltage, VOH VDD.2 V IOH = 2 μa VDD.4 V IOH = 2 ma, VDD = 3.3 V VDD.4 V IOH = 3 ma, VDD = 5.5 V Low Level Output Voltage, VOL.2 V IOL = 2 μa.4 V IOL = 2 ma, VDD = 3.3 V.4 V IOL = 3 ma, VDD = 5.5 V Power-Up Reset Voltage.4 V IOL = 2 μa, VDD. V SENSE INPUTS Falling Input Threshold Voltage, VIT V TA = C to 85 C V TA = C to 85 C V TA = C to 85 C V TA = C to 85 C V TA = C to 85 C V TA = 4 C to +85 C V TA = 4 C to +85 C V TA = 4 C to +85 C V TA = 4 C to +85 C V TA = 4 C to +85 C Hysteresis at SENSEv Inputs, VHYS mv VIT =.25 V 5 mv VIT =.68 V 2 mv VIT = 2.25 V 3 mv VIT = 2.93 V 4 mv VIT = 4.55 V INPUT VOLTAGE AT MR High Level, VIH.7 VDD V Low Level, VIL.3 VDD V INPUT TRANSITION RISE AND FALL RATE AT MR 5 ns/v HIGH LEVEL INPUT CURRENT, IH MR 3 8 μa MR =.7 VDD, VDD = 5.5 V SENSE 5 8 μa SENSE = VDD = 5.5 V SENSE2 6 9 μa SENSE2 = VDD = 5.5 V SENSE na SENSE3 = VDD LOW LEVEL INPUT CURRENT, IL MR 43 6 μa MR = V, VDD = 5.5 V SENSEv na SENSE, SENSE2, SENSE3 = V The lowest supply voltage at which becomes active. tr, VDD 5 μs/v. Rev. Page 3 of 2

4 ADM337 VDD = 2. V to 5.5 V, 4 C TA +85 C, unless otherwise noted. Table 2. ADM337-4 and ADM337-5 Parameter Min Typ Max Unit Test Conditions/Comments OPERATING VOLTAGE RANGE, VDD V SUPPLY CURRENT, IDD 4 μa INPUT CAPACITANCE, CI pf VI = V to VDD, Output High Level Output Voltage, VOH VDD.2 V IOH = 2 μa VDD.4 V IOH = 2 ma, VDD = 3.3 V VDD.4 V IOH = 3 ma, VDD = 5.5 V Low Level Output Voltage, VOL.2 V IOL = 2 μa.4 V IOL = 2 ma, VDD = 3.3 V.4 V IOL = 3 ma, VDD = 5.5 V Power-Up Reset Voltage.4 V IOL = 2 μa, VDD. V SENSE INPUTS Falling Input Threshold Voltage, VIT V TA = 4 C to +85 C V TA = 4 C to +85 C, 2.35 V VDD 5.5 V V TA = 4 C to +85 C V TA = 4 C to +85 C Hysteresis at SENSEv Inputs, VHYS mv VIT =.6 V 2 mv VIT = 2.25 V 3 mv VIT = 2.93 V INPUT VOLTAGE AT MR High Level, VIH.7 VDD V Low Level, VIL.3 VDD V INPUT TRANSITION RISE AND FALL RATE AT MR 5 ns/v HIGH LEVEL INPUT CURRENT, IH MR 3 8 μa MR =.7 VDD, VDD = 5.5 V SENSE 5 8 μa SENSE = VDD = 5.5 V SENSE na SENSE2 = VDD = 5.5 V SENSE na SENSE3 = VDD LOW LEVEL INPUT CURRENT, IL MR 43 6 μa MR = V, VDD = 5.5 V SENSEv na SENSE, SENSE2, SENSE3 = V The lowest supply voltage at which becomes active. tr, VDD 5 μs/v. Rev. Page 4 of 2

5 ADM337 TIMING REQUIREMENTS VDD = 2. V to 5.5 V, RL = MΩ, CL = 5 pf, TA = 25 C. Table 3. ADM337-8, ADM and ADM Parameter Min Typ Max Unit Test Conditions/Comments Pulse Width (tw) SENSEv 6 μs VSENSEvL = VIT.3 V, VSENSEvH = VIT+ +.3 V MR ns VIH =.7 VDD, VIL =.3 VDD Table 4. ADM337-4 and ADM337-5 Parameter Min Typ Max Unit Test Conditions/Comments Pulse Width (tw) SENSEv 3 μs VSENSEvL = VIT.3 V, VSENSEvH = VIT+ +.3 V MR ns VIH =.7 VDD, VIL =.3 VDD SWITCHING CHARACTERISTICS VDD = 2. V to 5.5 V, RL = MΩ, CL = 5 pf, TA = 25 C Table 5. ADM337-8, ADM and ADM Parameter Min Typ Max Unit Test Conditions/Comments Delay Time (td) ms VI(SENSEv) VIT+ +.2 V, MR.7 VDD Propagation Delay, High-to-Low, MR to / (tphl) 2 5 ns VI(SENSEv) VIT+ +.2 V, VIH.7 VDD, VIL.3 VDD Propagation Delay, Low-to-High, MR to / (tplh) 2 5 ns VI(SENSEv) VIT+ +.2 V, VIH.7 VDD, VIL.3 VDD Propagation Delay, High-to-Low, SENSEv to / (tphl) 5 μs VIH = VIT+ +.3 V, VIL = VIT.3 V, MR.7 VDD Propagation Delay, Low-to-High, SENSEv to / (tplh) 5 μs VIH = VIT+ +.3 V, VIL = VIT.3 V, MR.7 VDD The reset timeout delay of 2 ms masks the propagation delay Table 6. ADM337-4 and ADM337-5 Parameter Min Typ Max Unit Test Conditions/Comments Delay Time (td) ms VI(SENSEv) VIT+ +.2 V, MR.7 VDD Propagation Delay, High-to-Low, MR to / (tphl) 2 5 ns VI(SENSEv) VIT+ +.2 V, VIH.7 VDD, VIL.3 VDD Propagation Delay, Low-to-High, MR to / (tplh) 2 5 ns VI(SENSEv) VIT+ +.2 V, VIH.7 VDD, VIL.3 VDD Propagation Delay, High-to-Low, SENSEv to / (tphl) 3 μs VIH = VIT+ +.3 V, VIL = VIT.3 V, MR.7 VDD Propagation Delay, Low-to-High, SENSEv to / (tplh) 3 μs VIH = VIT+ +.3 V, VIL = VIT.3 V, MR.7 VDD The reset timeout delay of 2 ms masks the propagation delay. FUNCTIONAL TRUTH TABLE Table 7. MR SENSE > VIT SENSE2 > VIT2 SENSE3 > VIT3 L X X X L H H L H H L H H L H H L H H L H H L H H L H H H L X = don t care. Rev. Page 5 of 2

6 ADM337 ABSOLUTE MAXIMUM RATINGS Table 8. Parameter Supply Voltage Range, VDD MR Rating.3 V to +6 V.3 V to VDD +.3 V SENSE, SENSE2, SENSE3 (VDD +.3 V)VIT/VREF,.3 V to +6 V Maximum Low Output Current 5 ma Maximum High Output Current 5 ma Input Clamp Current (VI < V, VI > VDD) ±2 ma Output Clamp Current (VO < V, VO > VDD) ±2 ma Operating Temperature Range 4 C to +85 C Storage Temperature Range 65 C to +5 C Lead Temperature Soldering ( sec) 3 C Vapor Phase (6 sec) 25 C Infrared (5 sec) 22 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. THERMAL RESISTANCE Table 9. Package Type θja Unit 8-Lead SOIC_N (R-8) 26 C/W ESD CAUTION Rev. Page 6 of 2

7 ADM337 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SENSE SENSE2 2 SENSE3 3 GND 4 ADM337 TOP VIEW (Not to Scale) V DD MR Figure 3.Pin Configuration Table. Pin Function Descriptions Pin No. Mnemonic Description SENSE Sense Voltage Input. 2 SENSE2 Sense Voltage Input 2. 3 SENSE3 Sense Voltage Input 3. 4 GND Ground. 5 Active Low Reset Output. 6 Active High Reset Output. 7 MR Manual Reset. 8 VDD Supply Voltage. Rev. Page 7 of 2

8 ADM337 TYPICAL PERFORMANCE CHARACTERISTICS INPUT THRESHOLD VOLTAGE, V IT (V) T A = 25 C.5987 V DD = 2V FREE AIR TEMPERATURE, T A ( C) Figure 4. Sense Threshold Voltage vs. Free Air Temperature at VDD MINIMUM PULSE DURATION AT SENSE, t W (µs) V DD = 5.5V SENSE THRESHOLD OVERDRIVE (mv) Figure 7. ADM337-8, ADM and ADM Minimum Pulse Duration at Sense vs. Sense Threshold Overdrive SUPPLY CURRENT, I DD (µa) SENSEv = 5.5V 5 T A = 25 C SUPPLY VOLTAGE, V DD (V) Figure 5. Supply Current vs. Supply Voltage MINIMUM PULSE DURATION AT SENSE, t W (µs) V DD = 5.5V SENSE THRESHOLD OVERDRIVE (mv) Figure 8. ADM337-4 and ADM337-5 Minimum Pulse Duration at Sense vs. Sense Threshold Overdrive INPUT CURRENT, I I (µa) V DD = 5.5V 8 T A = 25 C INPUT VOLTAGE AT MR, V I (V) Figure 6. Input Current vs. Input Voltage at MR HIGH LEVEL OUTPUT VOLTAGE, V OH (V) C V DD = 2V C +25 C +85 C HIGH LEVEL OUTPUT CURRENT, I OH (ma) Figure 9. High Level Output Voltage vs. High Level Output Current Rev. Page 8 of 2

9 ADM337 HIGH LEVEL OUTPUT VOLTAGE, V OH (V) C C +25 C +85 C. V.5 DD = 5.5V HIGH LEVEL OUTPUT CURRENT, I OH (ma) Figure. High Level Output Voltage vs. High Level Output Current LOW LEVEL OUTPUT VOLTAGE, V OL (V) C C +25 C +85 C V. DD = 5.5V LOW LEVEL OUTPUT CURRENT, I OL (ma) Figure 2. Low Level Output Voltage vs. Low Level Output Current LOW LEVEL OUTPUT VOLTAGE, V OL (V) C C +25 C +85 C V DD = 2V LOW LEVEL OUTPUT CURRENT, I OL (ma) Figure. Low Level Output Voltage vs. Low Level Output Current Rev. Page 9 of 2

10 ADM337 THEORY OF OPERATION The ADM337 devices are triple voltage supervisors designed to monitor up to three supplies and provide a reset signal to DSP and microprocessor-based systems. There are five models available, all of which feature a combination of internally pretrimmed undervoltage threshold options for monitoring.8 V, 2.5 V, 3.3 V, and 5 V supplies. There are also adjustable input options with threshold voltages of either.6 V or.25 V. ADM337-8, ADM337-25, and ADM models have two internally fixed thresholds and one externally programmable threshold, via a resistor string, while the ADM337-4 and ADM337-5 offer one internally fixed threshold and two externally programmable thresholds via a resistor string. See the Ordering Guide for a list of all available options. INPUT CONFIGURATION The ADM337 is powered through VDD. To increase noise immunity in noisy applications, place a. μf capacitor between the VDD input and ground. The SENSEv inputs are resistant to short power supply glitches. Do not allow unused SENSEv inputs to float or to be grounded, instead connect it to a supply voltage greater than its specified threshold voltage. Typically, the threshold voltage at an adjustable SENSEv input is either.6 V or.25 V. Refer to the Ordering Guide for details. For example, to monitor a voltage greater than.25 V, connect a resistor divider network to the device as depicted in Figure 3, where, V MONITERED R+ R2 =.25 V R2 MONITORED VOLTAGE OUTPUT The reset outputs are guaranteed to be in the correct state for VDD down to. V. During power up, is asserted when the supply voltage becomes greater than. V. Once the supplies monitored at the SENSEv pins rise above their associated threshold level, the signal remains low for the reset timeout period before deasserting. Subsequently, if a supply monitored by the SENSEv pins falls below its associated threshold, the output reasserts. SENSEv V (NOM) V IT t d t d t Figure 4. Reset Timing Diagram The ADM337 features both an active-low push-pull output and active-high push-pull output. MANUAL (MR) The ADM337 features a manual reset input, which when driven low, asserts the reset output, as shown in Figure 5. When MR transitions from low to high, the reset remains asserted for the duration of the reset active timeout period before deasserting. An external push-button switch can be connected between MR and ground to allow the user to generate a reset. MR t R t R2 V REF =.25V Figure 3. Setting the Adjustable Monitor t d t Figure 5. Manual Reset Timing Diagram Rev. Page of 2

11 ADM337 OUTLINE DIMENSIONS 5. (.968) 4.8 (.89) 4. (.574) 3.8 (.497) (.244) 5.8 (.2284).25 (.98). (.4) COPLANARITY. SEATING PLANE.27 (.5) BSC.75 (.688).35 (.532).5 (.2).3 (.22) 8.25 (.98).7 (.67).5 (.96).25 (.99).27 (.5).4 (.57) 45 COMPLIANT TO JEDEC STANDARDS MS-2-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 6. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches). 247-A ORDERING GUIDE Model Nominal Input Voltage Threshold Voltage (Typical) Temperature SENSE SENSE2 SENSE3 SENSE SENSE2 SENSE3 Range Package Description ADM337-8ARZ 3.3 V.8 V Adj V.68 V.25 V 4 C to +85 C 8-Lead SOIC_N R-8 ADM337-8ARZ-RL7 3.3 V.8 V Adj V.68 V.25 V 4 C to +85 C 8-Lead SOIC_N R-8 ADM337-25ARZ 3.3 V 2.5 V Adj V 2.25 V.25 V 4 C to +85 C 8-Lead SOIC_N R-8 ADM337-25ARZ-RL7 3.3 V 2.5 V Adj V 2.25 V.25 V 4 C to +85 C 8-Lead SOIC_N R-8 ADM337-33ARZ 5 V 3.3 V Adj V 2.93 V.25 V 4 C to +85 C 8-Lead SOIC_N R-8 ADM337-33ARZ-RL7 5 V 3.3 V Adj V 2.93 V.25 V 4 C to +85 C 8-Lead SOIC_N R-8 ADM337-4ARZ 2.5 V Adj 3 Adj V.6 V.6 V 4 C to +85 C 8-Lead SOIC_N R-8 ADM337-4ARZ-RL7 2.5 V Adj 3 Adj V.6 V.6 V 4 C to +85 C 8-Lead SOIC_N R-8 ADM337-5ARZ 3.3 V Adj 3 Adj V.6 V.6 V 4 C to +85 C 8-Lead SOIC_N R-8 ADM337-5ARZ-RL7 3.3 V Adj 3 Adj V.6 V.6 V 4 C to +85 C 8-Lead SOIC_N R-8 Z = RoHS Compliant Part V adjustable. External resistor divider determines the actual sense voltage. 3.6 V adjustable. External resistor divider determines the actual sense voltage. Package Option Rev. Page of 2

12 ADM337 NOTES 27 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D /7() Rev. Page 2 of 2

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