ADM6326-28ARTZ-R7

FEATURES FUNCTIONAL BLOCK DIAGRAMS APPLICATIONS ADM6326/ADM6346 VCC RESET GENERATOR (100ms) VREF GND Figure 1. ADM6328/ADM6348 VCC Telecommunications Microprocessor systems Desktop and notebook computers Portable equipment RESET 08052-001 Ultralow supply current of 1 µA maximum (ADM6326/ADM6328) Accurate monitoring of 2.5 V, 3 V, 3.3 V, and 5 V rails Reset thresholds available in increments from 2.2 V to 4.63 V Glitch immunity from negative-going VCC transients 2 reset output options Push-pull RESET (ADM6326/ADM6346) Open-drain RESET (ADM6328/ADM6348) Minimum reset timeout of 100 ms Operating temperature range of −40°C to +85°C 3-lead SOT-23 package RESET GENERATOR (100ms) VREF GND RESET 08052-002 Data Sheet Ultralow Power, 3-Lead, SOT-23 Microprocessor Reset Circuits ADM6326/ADM6328/ADM6346/ADM6348 Figure 2. GENERAL DESCRIPTION The ADM6326/ADM6328/ADM6346/ADM6348 devices provide low cost solutions for protecting sensitive circuitry, such as microprocessor and telecommunications circuitry. With built-in glitch immunity, ultralow supply currents, and 24 reset threshold voltage options, the ADM6326/ADM6328/ ADM6346/ADM6348 not only ensure that systems are immune to fast transients on VCC, but also that the devices are suitable for monitoring a variety of supply voltages in low power, portable equipment. These devices provide a reset output during power-up, powerdown, and brownout conditions. On power-up, an internal timer holds RESET asserted for at least 100 ms. This holds the Rev. B microprocessor in a reset state until conditions have stabilized. The reset output remains operational with VCC as low as 1 V. The ADM6326 and ADM6346 have an active low push-pull reset output. The ADM6328 and ADM6348 have an active low opendrain reset output, which requires an external pull-up resistor. The ADM6326 and ADM6328 offer a choice of ten reset thresholds in increments between 2.2 V and 3.08 V, whereas the ADM6346 and ADM6348 offer a choice of 14 reset thresholds between 3.3 V and 4.63 V. Not all options are released for sale as standard models. See the Ordering Guide for details. These devices are available in a 3-lead SOT-23 package and operate over the extended temperature range of −40°C to +85°C. Document Feedback 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 ©2009–2018 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADM6326/ADM6328/ADM6346/ADM6348 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configuration and Function Descriptions..............................5 Applications ....................................................................................... 1 Typical Performance Characteristics ..............................................6 Functional Block Diagrams ............................................................. 1 Theory of Operation .........................................................................7 General Description ......................................................................... 1 Reset Output ..................................................................................7 Revision History ............................................................................... 2 Interfacing to Other Devices .......................................................7 Specifications..................................................................................... 3 Transient Immunity ......................................................................7 Absolute Maximum Ratings............................................................ 4 Outline Dimensions ..........................................................................8 Thermal Resistance ...................................................................... 4 Ordering Guide .............................................................................9 ESD Caution .................................................................................. 4 REVISION HISTORY 5/2018—Rev. A to Rev. B Changes to General Description Section ...................................... 1 Changes to Table 2 ............................................................................ 3 Added Note 1, Table 2; Renumbered Sequentially ....................... 3 Changes to Ordering Guide ............................................................ 9 6/2014—Rev. 0 to Rev. A Changes to Figure 1 and Figure 2 ................................................... 1 9/2009—Revision 0: Initial Version Rev. B | Page 2 of 9 Data Sheet ADM6326/ADM6328/ADM6346/ADM6348 SPECIFICATIONS TA = −40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C and VCC = 3 V. Overtemperature limits are guaranteed by design. Table 1. Parameter OPERATING VOLTAGE RANGE, VCC INPUT CURRENT, ICC RESET THRESHOLD Threshold Voltage, VTH (See Table 2) Temperature Coefficient Hysteresis ADM6326/ADM6328 ADM6346/ADM6348 TIMING CHARACTERISTICS VCC to Reset Delay (tRD) Reset Active Timeout Period (tRP) RESET OUTPUT VOLTAGE LOW, VOL Min 1.0 Typ VTH − 2.5% VTH − 1.5% 0.5 Max 5.5 1.0 Unit V µA 1.0 1.75 µA VTH VTH 40 VTH + 2.5% VTH + 1.5% V V ppm/°C 6.3 9.5 ADM6326/ADM6328 only, VCC = 3.0 V for VTH ≤ 2.93 V, VCC = 3.2 V for VTH > 2.93 V, no load VCC = 5.5 V, no load TA = 25°C mV mV 20 185 µs ms V VCC > 2.1 V, ISINK = 1.6 mA, reset asserted 0.8 × VCC V V VCC ≥ 1.2 V, ISINK = 100 μA, reset asserted ADM6326 only, VCC = 3.2 V, ISOURCE = 500 µA 0.8 × VCC V 0.8 × VCC V ADM6326/ADM6346 only, VCC = 4.5 V, ISOURCE = 800 µA, VTH ≤ 4.38 V ADM6326/ADM6346 only, VCC = VTH(MAX), ISOURCE = 800 µA, VTH ≥ 4.5 V 100 280 0.3 0.4 RESET OUTPUT VOLTAGE HIGH, VOH Test Conditions/Comments 0.1 OPEN-DRAIN RESET OUTPUT LEAKAGE CURRENT VCC = VTH to (VTH − 100 mV) µA Table 2. Reset Threshold Voltage TA = −40°C to +85°C TA = 25°C Parameter Min Typ Max Min Max Unit RESET THRESHOLD VOLTAGE (VTH)1 ADM6326-22, ADM6328-22 ADM6328-23 ADM6328-25 ADM6326-26 ADM6326-27, ADM6328-27 ADM6328-28 ADM6326-29 ADM6326-30 ADM6326-31 ADM6348-33 ADM6348-34 ADM6348-35 ADM6348-36 ADM6348-37 ADM6348-38 ADM6348-39 ADM6348-40 ADM6348-41 ADM6348-42 ADM6348-43 ADM6348-44 ADM6348-45 ADM6346-46, ADM6348-46 2.167 2.285 2.462 2.591 2.66 2.758 2.886 2.955 3.034 3.25 3.349 3.447 3.546 3.644 3.743 3.841 3.94 4.038 4.137 4.235 4.314 4.432 4.56 2.2 2.32 2.5 2.63 2.7 2.8 2.93 3.00 3.08 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.38 4.5 4.63 2.233 2.355 2.537 2.669 2.741 2.842 2.974 3.045 3.126 3.35 3.451 3.552 3.654 3.755 3.857 3.958 4.06 4.161 4.263 4.364 4.446 4.567 4.699 2.145 2.262 2.437 2.564 2.633 2.73 2.857 2.925 3.003 3.217 3.315 3.412 3.51 3.607 3.705 3.802 3.9 3.997 4.095 4.192 4.27 4.387 4.514 2.25 2.375 2.562 2.696 2.768 2.87 3.0 3.075 3.15 3.383 3.485 3.587 3.69 3.792 3.895 3.997 4.1 4.202 4.305 4.407 4.489 4.612 4.746 V V V V V V V V V V V V V V V V V V V V V V V 1 Not all device options are released for sale as standard models. See the Ordering Guide for full details. Rev. B | Page 3 of 9 ADM6326/ADM6328/ADM6346/ADM6348 Data Sheet ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 3. Parameter Supply Voltage, VCC Input Current, ICC Output Voltage Push-Pull RESET Open-Drain RESET Output Current (RESET) Rate of Rise of VCC Temperature Storage Operating Soldering (10 sec) Rating −0.3 V to +6 V 20 mA θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. −0.3 V to (VCC + 0.3 V) −0.3 V to +6 V 20 mA 100 V/µs Package Type 3-Lead SOT-23 Table 4. Thermal Resistance ESD CAUTION −65°C to +155°C −40°C to +85°C 300°C Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operating conditions for extended periods may affect product reliability. Rev. B | Page 4 of 9 θJA 270 Unit °C/W Data Sheet ADM6326/ADM6328/ADM6346/ADM6348 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 1 RESET 2 ADM6326/ ADM6328/ ADM6346/ ADM6348 3 TOP VIEW (Not to Scale) VCC 08052-003 GND Figure 3. ADM6326/ADM6328/ADM6346/ADM6348 Pin Configuration Table 5. Pin Function Descriptions Pin No. 1 2 Mnemonic GND RESET 3 VCC Description Ground Reference for All Signals; 0 V. Active Low Logic Output. This pin is low when VCC is less than the reset threshold; it remains low for 185 ms (typical) after VCC becomes greater than the reset threshold. Supply Voltage Being Monitored. Rev. B | Page 5 of 9 ADM6326/ADM6328/ADM6346/ADM6348 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 1.0 280 0.9 0.7 0.6 0.5 VCC = 1.4V 0.4 0.3 0.2 220 200 180 160 140 0 20 40 60 80 TEMPERATURE (°C) 100 –40 08052-004 –20 0 20 40 60 80 TEMPERATURE (°C) Figure 4. Supply Current vs. Temperature Figure 6. Power-Up Reset Timeout vs. Temperature 800 250 700 POWER-DOWN RESET DELAY (µs) MAXIMUM TRANSIENT DURATION (µs) –20 08052-007 120 0.1 0 –40 240 600 500 400 300 200 200 150 100 VOD = 10mV VOD = 20mV 50 VOD = 200mV 100 0 10 100 RESET THRESHOLD OVERDRIVE, VTH – VCC (mV) 1000 0 –40 08052-006 1 –20 0 20 VOD = 100mV 40 60 TEMPERATURE (°C) Figure 7. Power-Down Reset Delay vs. Temperature Figure 5. Maximum Transient Duration vs. Reset Threshold Overdrive Rev. B | Page 6 of 9 80 08052-005 SUPPLY CURRENT (µA) POWER-UP RESET TIMEOUT (ms) 260 VCC = 5V VCC = 3.3V 0.8 Data Sheet ADM6326/ADM6328/ADM6346/ADM6348 THEORY OF OPERATION RESET OUTPUT The ADM6326 and ADM6346 have an active low, push-pull reset output, whereas the ADM6328 and ADM6348 have an active low, open-drain reset output, which requires an external pull-up resistor. The RESET signal is guaranteed to be valid for VCC down to 1 V. When the ADM6326/ADM6328/ADM6346/ADM6348 are powered up, the RESET output remains low for a period typically equal to the RESET active timeout period of 185 ms. This feature allows adequate time for the system to power up correctly and for the power supply to stabilize before any devices are brought out of reset and are allowed to begin executing instructions. Initializing a system in this way provides a more reliable startup for microprocessor systems. When the monitored voltage falls below its associated threshold (VTH), RESET is asserted within 20 μs (typical). Asserting RESET this quickly means that the entire system can be reset at once before any part of the system’s voltage falls below its recommended operating voltage. This system reset can avoid dangerous and/or erroneous operation of a microprocessor based system. VCC INTERFACING TO OTHER DEVICES The active low, open-drain reset output of the ADM6328 and ADM6348 makes these devices ideal for integration with devices such as microprocessors with bidirectional reset pins. Simply connect the RESET output of the ADM6328 or ADM6348 to the RESET input of the microprocessor using a single pull-up resistor to allow either device to initiate a system reset (see Figure 8). VCC VCC MICROPROCESSOR SYSTEM ADM6328/ADM6348 RESET INPUT RESET GND GND Figure 8. Interfacing to a Microprocessor with a Bidirectional Reset Pin TRANSIENT IMMUNITY To avoid unnecessary resets caused by fast power supply transients, the ADM6326/ADM6328/ADM6346/ADM6348 provide glitch immunity from negative-going VCC transients. Figure 5 shows the RESET comparator overdrive (that is, the maximum magnitude of negative-going pulses with respect to the typical threshold) vs. the pulse duration without a reset. VTH VTH VCC 1V 0V tRP tRD 0V Figure 9. RESET Timing Rev. B | Page 7 of 9 08052-009 VCC RESET VCC RPULL-UP 08052-008 The ADM6326/ADM6328/ADM6346/ADM6348 are designed to protect the integrity of a system’s operation by ensuring the proper operation of the system during power-up, power-down, and brownout conditions. Ultralow supply currents make these devices particularly suitable for use in low power, portable equipment. ADM6326/ADM6328/ADM6346/ADM6348 Data Sheet OUTLINE DIMENSIONS 3.04 2.90 2.80 1.40 1.30 1.20 3 1 2 0.60 0.45 2.05 1.78 1.03 0.89 1.12 0.89 0.100 0.013 SEATING PLANE GAUGE PLANE 0.54 REF 0.180 0.085 0.51 0.37 0.25 0.60 MAX 0.30 MIN COMPLIANT TO JEDEC STANDARDS TO-236-AB Figure 10. 3-Lead Small Outline Transistor Package [SOT-23-3] (RT-3) Dimensions shown in millimeters Rev. B | Page 8 of 9 011909-C 1.02 0.95 0.88 2.64 2.10 Data Sheet ADM6326/ADM6328/ADM6346/ADM6348 ORDERING GUIDE Model1, 2 ADM6326-22ARTZ-R7 ADM6326-26ARTZ-R7 ADM6326-27ARTZ-R7 ADM6326-29ARTZ-R7 ADM6326-30ARTZ-R7 ADM6326-31ARTZ-R7 ADM6328-22ARTZ-R7 ADM6328-23ARTZ-R7 ADM6328-25ARTZ-R7 ADM6328-27ARTZ-R7 ADM6328-28ARTZ-R7 ADM6346-46ARTZ-R7 ADM6348-33ARTZ-R7 ADM6348-34ARTZ-R7 ADM6348-35ARTZ-R7 ADM6348-36ARTZ-R7 ADM6348-37ARTZ-R7 ADM6348-38ARTZ-R7 ADM6348-39ARTZ-R7 ADM6348-40ARTZ-R7 ADM6348-41ARTZ-R7 ADM6348-42ARTZ-R7 ADM6348-43ARTZ-R7 ADM6348-44ARTZ-R7 ADM6348-45ARTZ-R7 ADM6348-46ARTZ-R7 Typical Threshold Voltage (TA = 25°C) 2.2 V 2.63 V 2.7 V 2.93 V 3.0 V 3.08 V 2.2 V 2.32 V 2.5 V 2.7 V 2.8 V 4.63 V 3.3 V 3.4 V 3.5 V 3.6 V 3.7 V 3.8 V 3.9 V 4.0 V 4.1 V 4.2 V 4.3 V 4.38 V 4.5 V 4.63 V RESET Output Structure Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Push-Pull Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Package Description 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 Package Option RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 Marking Code LAQ LAU LAV LAX LAY LAZ LB0 LB1 LB3 LB5 LB6 LCU LCV LCW LCX LCY LCZ LD0 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8 The ADM6326/ADM6328/ADM6346/ADM6348 include many device options; however, not all options are released for sale. Released options are called standard models and are listed in the Ordering Guide. For the most up to date list of standard models, check the Single Supply Monitors IC page on the Analog Devices website. Contact sales for information on nonstandard models and be aware that samples and production units have very long lead times. 2 Z = RoHS Compliant Part. 1 ©2009–2018 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08052-0-5/18(B) Rev. B | Page 9 of 9