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Ultralow Power, 3-Lead, SOT-23 Microprocessor Reset Circuits ADM6326/ADM6328/ADM6346/ADM6348
FEATURES
Ultralow supply current of 1 A 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 -40C to +85C 3-lead SOT-23 package
FUNCTIONAL BLOCK DIAGRAMS
ADM6326/ADM6346
VCC VREF RESET GENERATOR (100ms)
RESET
GND
Figure 1.
ADM6328/ADM6348
VCC VREF RESET GENERATOR (100ms) RESET
APPLICATIONS
Telecommunications Microprocessor systems Desktop and notebook computers Portable equipment
GND
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 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. These devices are available in a 3-lead SOT-23 package and operate over the extended temperature range of -40C to +85C.
Rev. 0
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)2009 Analog Devices, Inc. All rights reserved.
08052-002
08052-001
ADM6326/ADM6328/ADM6346/ADM6348 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagrams ............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 Thermal Resistance ...................................................................... 4 ESD Caution .................................................................................. 4 Pin Configuration and Function Descriptions..............................5 Typical Performance Characteristics ..............................................6 Theory of Operation .........................................................................7 Reset Output ..................................................................................7 Interfacing to Other Devices .......................................................7 Transient Immunity ......................................................................7 Outline Dimensions ..........................................................................8 Ordering Guide .............................................................................9
REVISION HISTORY
9/09--Revision 0: Initial Version
Rev. 0 | Page 2 of 12
ADM6326/ADM6328/ADM6346/ADM6348 SPECIFICATIONS
TA = -40C to +85C, unless otherwise noted. Typical values are at TA = 25C and VCC = 3 V. Overtemperature limits are guaranteed by design. Table 1.
Parameter OPERATING VOLTAGE RANGE, VCC INPUT CURRENT, ICC Min 1.0 Typ 0.5 1.0 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 RESET OUTPUT VOLTAGE HIGH, VOH VTH - 2.5% VTH - 1.5% VTH VTH 40 6.3 9.5 20 185 Max 5.5 1.0 1.75 VTH + 2.5% VTH + 1.5% Unit V A A V V ppm/C mV mV s ms V V V V V 0.1 A VCC = VTH to (VTH - 100 mV) VCC > 2.1 V, ISINK = 1.6 mA, reset asserted VCC 1.2 V, ISINK = 100 A, reset asserted ADM6326 only, VCC = 3.2 V, ISOURCE = 500 A ADM6326/ADM6346 only, VCC = 4.5 V, ISOURCE = 800 A, VTH 4.38 V ADM6326/ADM6346 only, VCC = VTH(MAX), ISOURCE = 800 A, VTH 4.5 V Test Conditions/Comments 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 = 25C
100
280 0.3 0.4
0.8 x VCC 0.8 x VCC 0.8 x VCC
OPEN-DRAIN RESET OUTPUT LEAKAGE CURRENT
Table 2. Reset Threshold Voltage
TA = 25C Parameter RESET THRESHOLD VOLTAGE (VTH) ADM632x-22 ADM632x-23 ADM632x-24 ADM632x-25 ADM632x-26 ADM632x-27 ADM632x-28 ADM632x-29 ADM632x-30 ADM632x-31 ADM634x-33 ADM634x-34 ADM634x-35 ADM634x-36 ADM634x-37 ADM634x-38 ADM634x-39 ADM634x-40 ADM634x-41 ADM634x-42 ADM634x-43 ADM634x-44 ADM634x-45 ADM634x-46 Min 2.167 2.285 2.364 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 Typ 2.2 2.32 2.4 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 Max 2.233 2.355 2.436 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 TA = -40C to +85C Min 2.145 2.262 2.34 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 Max 2.25 2.375 2.46 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 Unit V V V V V V V V V V V V V V V V V V V V V V V V
Rev. 0 | Page 3 of 12
ADM6326/ADM6328/ADM6346/ADM6348 ABSOLUTE MAXIMUM RATINGS
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 -0.3 V to (VCC + 0.3 V) -0.3 V to +6 V 20 mA 100 V/s -65C to +155C -40C to +85C 300C
THERMAL RESISTANCE
JA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 4. Thermal Resistance
Package Type 3-Lead SOT-23 JA 270 Unit C/W
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. 0 | Page 4 of 12
ADM6326/ADM6328/ADM6346/ADM6348 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
GND
1
ADM6326/ ADM6328/ ADM6346/ ADM6348
TOP VIEW (Not to Scale)
3
VCC
08052-003
RESET 2
Figure 3. ADM6326/ADM6328/ADM6346/ADM6348 Pin Configuration
Table 5. Pin Function Descriptions
Pin No. 1 2 3 Mnemonic GND RESET 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. 0 | Page 5 of 12
ADM6326/ADM6328/ADM6346/ADM6348 TYPICAL PERFORMANCE CHARACTERISTICS
1.0 0.9 0.8 VCC = 5V VCC = 3.3V 280 260
POWER-UP RESET TIMEOUT (ms)
240 220 200 180 160 140 120
08052-007
SUPPLY CURRENT (A)
0.7 0.6 0.5 0.4 0.3 0.2 0.1
08052-004
VCC = 1.4V
0 -40
-20
0
20
40
60
80
100 -40
-20
0
20
40
60
80
TEMPERATURE (C)
TEMPERATURE (C)
Figure 4. Supply Current vs. Temperature
Figure 6. Power-Up Reset Timeout vs. Temperature
800
250
MAXIMUM TRANSIENT DURATION (s)
700
POWER-DOWN RESET DELAY (s)
200
600 500 400 300 200 100 0
08052-006
150
100 VOD = 10mV 50 VOD = 20mV VOD = 200mV 0 -40 VOD = 100mV
-20
0
20
40
60
80
RESET THRESHOLD OVERDRIVE, VTH - VCC (mV)
TEMPERATURE (C)
Figure 5. Maximum Transient Duration vs. Reset Threshold Overdrive
Figure 7. Power-Down Reset Delay vs. Temperature
Rev. 0 | Page 6 of 12
08052-005
1
10
100
1000
ADM6326/ADM6328/ADM6346/ADM6348 THEORY OF OPERATION
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.
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 VCC
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 s (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.
RPULL-UP
ADM6328/ADM6348
RESET GND
MICROPROCESSOR SYSTEM
RESET INPUT
08052-008
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.
VCC VCC 1V 0V VCC
VTH
VTH
0V
Figure 9. RESET Timing
Rev. 0 | Page 7 of 12
08052-009
RESET
tRP
tRD
ADM6326/ADM6328/ADM6346/ADM6348 OUTLINE DIMENSIONS
3.04 2.90 2.80 1.40 1.30 1.20
1
3
2.64 2.10
2
0.60 0.45 1.02 0.95 0.88 0.100 0.013 SEATING PLANE 2.05 1.78
1.03 0.89
1.12 0.89
GAUGE PLANE
0.54 REF
0.180 0.085 0.51 0.37 0.25 0.60 MAX 0.30 MIN
011909-C
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. 0 | Page 8 of 12
ADM6326/ADM6328/ADM6346/ADM6348
ORDERING GUIDE
Model 1 ADM6326-22ARTZ-R7 2, 3 ADM6326-23ARTZ-R72 ADM6326-24ARTZ-R72 ADM6326-25ARTZ-R72 ADM6326-26ARTZ-R72 ADM6326-27ARTZ-R72 ADM6326-28ARTZ-R72 ADM6326-29ARTZ-R72 ADM6326-30ARTZ-R72 ADM6326-31ARTZ-R72 ADM6328-22ARTZ-R72 ADM6328-23ARTZ-R72 ADM6328-24ARTZ-R72 ADM6328-25ARTZ-R72 ADM6328-26ARTZ-R72 ADM6328-27ARTZ-R72 ADM6328-28ARTZ-R72, 3 ADM6328-29ARTZ-R72 ADM6328-30ARTZ-R72 ADM6328-31ARTZ-R72 ADM6346-33ARTZ-R72, 3 ADM6346-34ARTZ-R72 ADM6346-35ARTZ-R72 ADM6346-36ARTZ-R72 ADM6346-37ARTZ-R72 ADM6346-38ARTZ-R72 ADM6346-39ARTZ-R72 ADM6346-40ARTZ-R72 ADM6346-41ARTZ-R72 ADM6346-42ARTZ-R72 ADM6346-43ARTZ-R72 ADM6346-44ARTZ-R72 ADM6346-45ARTZ-R72 ADM6346-46ARTZ-R72 ADM6348-33ARTZ-R72 ADM6348-34ARTZ-R72 ADM6348-35ARTZ-R72 ADM6348-36ARTZ-R72 ADM6348-37ARTZ-R72 ADM6348-38ARTZ-R72 ADM6348-39ARTZ-R72 ADM6348-40ARTZ-R72 ADM6348-41ARTZ-R72 ADM6348-42ARTZ-R72 ADM6348-43ARTZ-R72 ADM6348-44ARTZ-R72 ADM6348-45ARTZ-R72 ADM6348-46ARTZ-R72, 3
1 2
Typical Threshold Voltage (TA = 25C) 2.2 V 2.32 V 2.4 V 2.5 V 2.63 V 2.7 V 2.8 V 2.93 V 3.0 V 3.08 V 2.2 V 2.32 V 2.4 V 2.5 V 2.63 V 2.7 V 2.8 V 2.93 V 3.0 V 3.08 V 3.3 V 3.4 V 3.5 V 3.6 V 3.7 V 3.8 V 3.9 V 3.0 V 4.1 V 4.2 V 4.3 V 4.38 V 4.5 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 3.0 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 Push-Pull Push-Pull Push-Pull Push-Pull Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Open-Drain Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull 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 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 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
Branding LAQ LAR LAS LAT LAU LAV LAW LAX LAY LAZ LB0 LB1 LB2 LB3 LB4 LB5 LB6 LB7 LB8 LB9 LBA LBC LBD LBE LBF LBG LBH LCN LCP LCQ LCR LCS LCT LCU LCV LCW LCX LCY LCZ LD0 LD1 LD2 LD3 LD4 LD5 LD6 LD7 LD8
Contact sales for the availability of nonstandard models. Z = RoHS Compliant Part. 3 Standard model.
Rev. 0 | Page 9 of 12
ADM6326/ADM6328/ADM6346/ADM6348 NOTES
Rev. 0 | Page 10 of 12
ADM6326/ADM6328/ADM6346/ADM6348 NOTES
Rev. 0 | Page 11 of 12
ADM6326/ADM6328/ADM6346/ADM6348 NOTES
(c)2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D08052-0-9/09(0)
Rev. 0 | Page 12 of 12

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