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ADM6326
Ultralow Power, 3-Lead, SOT-23, Microprocessor Reset Circuit, Active-Low Push-Pull Output, 0.5 µA Supply Current
Ultralow Power, 3-Lead, SOT-23
Microprocessor Reset CircuitsADM6326/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 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
APPLICATIONS
Telecommunications
Microprocessor systems
Desktop and notebook computers
Portable equipment
FUNCTIONAL BLOCK DIAGRAMS
VCC
GND
RESETFigure 1.
VCC
GND
RESETFigure 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 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, 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 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 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.
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
ADM6326/ADM6328/ADM6346/ADM6348SPECIFICATIONS
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. 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 = 25°C VCC = VTH to (VTH − 100 mV) VCC > 2.1 V, ISINK = 1.6 mA, reset asserted VCC ≥ 1.2 V, ISINK = 100 μA, reset asserted ADM6326 only, VCC = 3.2 V, ISOURCE = 500 μA 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
Table 2. Reset Threshold Voltage
ABSOLUTE MAXIMUM RATINGS
Table 3.
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
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 4. Thermal Resistance
ESD CAUTION
ADM6326/ADM6328/ADM6346/ADM6348PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
RESET
GND
VCC
Figure 3. ADM6326/ADM6328/ADM6346/ADM6348 Pin Configuration
Table 5. Pin Function Descriptions 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.
TYPICAL PERFORMANCE CHARACTERISTICS 0
TEMPERATURE(°C)
Figure 4. Supply Current vs. Temperature 0
M T
RESET THRESHOLD OVERDRIVE, VTH – VCC (mV)
Figure 5. Maximum Transient Duration vs. Reset Threshold Overdrive
UP RE
TEMPERATURE (°C)Figure 6. Power-Up Reset Timeout vs. Temperature
N RE
DE
TEMPERATURE (°C)
–40–20020408060Figure 7. Power-Down Reset Delay vs. Temperature
