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ADM6346-44ARTZ-R7

P1-P3P4-P6P7-P9P10-P12
Ultralow Power, 3-Lead, SOT-23
Microprocessor Reset Circuits
Data Sheet
ADM6326/ADM6328/ADM6346/ADM6348
FEATURES
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 V
CC
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
APPLICATIONS
Telecommunications
Microprocessor systems
Desktop and notebook computers
Portable equipment
FUNCTIONAL BLOCK DIAGRAMS
08052-001
RESET
GENERATOR
(100ms)
ADM6326/ADM6346
V
REF
V
CC
GND
RESET
F
igure 1.
RESET
GENERATOR
(100ms)
ADM6328/ADM6348
V
REF
V
CC
GND
RESET
08052-002
F
igure 2.
GENERAL DESCRIPTION
The ADM6326/ADM6328/ADM6346/ADM6348 devices provide
low cost solutions for protecting sensitive circuitry, such as micro-
processor 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 V
CC
, 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, power-
down, 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 V
CC
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 open-
drain 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 −40°C to +85°C.
Rev. A 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 ©2009–2014 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
ADM6326/ADM6328/ADM6346/ADM6348 Data Sheet
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
6/14—Rev. 0 to Rev. A
Changes to Figure 1 and Figure 2 ................................................... 1
9/09—Revision 0: Initial Version
Rev. A | Page 2 of 12
Data Sheet ADM6326/ADM6328/ADM6346/ADM6348
SPECIFICATIONS
T
A
= −40°C to +85°C, unless otherwise noted. Typical values are at T
A
= 25°C and V
CC
= 3 V. Overtemperature limits are guaranteed by design.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
OPERATING VOLTAGE RANGE, V
CC
1.0 5.5 V
INPUT CURRENT, I
CC
0.5 1.0 µA ADM6326/ADM6328 only, V
CC
= 3.0 V for V
TH
≤
2.93 V, V
CC
= 3.2 V for V
TH
> 2.93 V, no load
1.0 1.75 µA V
CC
= 5.5 V, no load
RESET THRESHOLD
Threshold Voltage, V
TH
(See Table 2) V
TH
− 2.5% V
TH
V
TH
+ 2.5% V
V
TH
− 1.5% V
TH
V
TH
+ 1.5% V T
A
= 25°C
Temperature Coefficient 40 ppm/°C
Hysteresis
ADM6326/ADM6328 6.3 mV
ADM6346/ADM6348 9.5 mV
TIMING CHARACTERISTICS
V
CC
to Reset Delay (t
RD
) 20 µs V
CC
= V
TH
to (V
TH
− 100 mV)
Reset Active Timeout Period (t
RP
) 100 185 280 ms
RESET
OUTPUT VOLTAGE LOW, V
OL
0.3 V V
CC
> 2.1 V, I
SINK
= 1.6 mA, reset asserted
0.4 V V
CC
≥ 1.2 V, I
SINK
= 100 μA, reset asserted
RESET
OUTPUT VOLTAGE HIGH, V
OH
0.8 × V
CC
V ADM6326 only, V
CC
= 3.2 V, I
SOURCE
= 500 µA
0.8 × V
CC
V ADM6326/ADM6346 only, V
CC
= 4.5 V,
I
SOURCE
= 800 µA, V
TH
≤ 4.38 V
0.8 × V
CC
V ADM6326/ADM6346 only, V
CC
= V
TH(MAX)
,
I
SOURCE
= 800 µA, V
TH
≥ 4.5 V
OPEN-DRAIN
RESET
OUTPUT LEAKAGE CURRENT
0.1 µA
Table 2. Reset Threshold Voltage
T
A
= 25°C
T
A
= −40°C to +85°C
Parameter
Min Typ Max Min Max
Unit
RESET THRESHOLD VOLTAGE (V
TH
)
ADM632x-22 2.167 2.2 2.233 2.145 2.25 V
ADM632x-23 2.285 2.32 2.355 2.262 2.375 V
ADM632x-24 2.364 2.4 2.436 2.34 2.46 V
ADM632x-25 2.462 2.5 2.537 2.437 2.562 V
ADM632x-26 2.591 2.63 2.669 2.564 2.696 V
ADM632x-27 2.66 2.7 2.741 2.633 2.768 V
ADM632x-28 2.758 2.8 2.842 2.73 2.87 V
ADM632x-29 2.886 2.93 2.974 2.857 3.0 V
ADM632x-30 2.955 3.00 3.045 2.925 3.075 V
ADM632x-31 3.034 3.08 3.126 3.003 3.15 V
ADM634x-33 3.25 3.3 3.35 3.217 3.383 V
ADM634x-34 3.349 3.4 3.451 3.315 3.485 V
ADM634x-35 3.447 3.5 3.552 3.412 3.587 V
ADM634x-36 3.546 3.6 3.654 3.51 3.69 V
ADM634x-37 3.644 3.7 3.755 3.607 3.792 V
ADM634x-38 3.743 3.8 3.857 3.705 3.895 V
ADM634x-39 3.841 3.9 3.958 3.802 3.997 V
ADM634x-40 3.94 4.0 4.06 3.9 4.1 V
ADM634x-41 4.038 4.1 4.161 3.997 4.202 V
ADM634x-42 4.137 4.2 4.263 4.095 4.305 V
ADM634x-43 4.235 4.3 4.364 4.192 4.407 V
ADM634x-44 4.314 4.38 4.446 4.27 4.489 V
ADM634x-45 4.432 4.5 4.567 4.387 4.612 V
ADM634x-46 4.56 4.63 4.699 4.514 4.746 V
Rev. A | Page 3 of 12
P1-P3P4-P6P7-P9P10-P12

ADM6346-44ARTZ-R7

Mfr. #:
Buy ADM6346-44ARTZ-R7
Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits 3-PIN ULTRA-LOW POWER RESET
Lifecycle:
New from this manufacturer.
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