Low Voltage, High Accuracy, Triple/Quad
Voltage Microprocessor Supervisory Circuit
ADM6710
FEATURES
Accurate monitoring of up to four power supply voltages
5 factory-set threshold options: 1.8 V, 2.5 V, 3.0 V, 3.3 V, 5 V
Adjustable input threshold voltage = 0.62 V (1.5% accuracy)
200 ms typical reset timeout
Open-drain RESET output (10 μA internal pull-up)
Reset output stage: active low, valid to IN
1
= 1 V or IN
2
= 1 V
Low power consumption (35 μA)
Power supply glitch immunity
Specified from −40°C to +85°C
6-lead SOT-23 package
IN
1
FUNCTIONAL BLOCK DIAGRAM
ADM6710
IN
2
, V
CC
IN
2
,
V
CC
RESET
200ms
TIMEOUT
IN
3
UVLO
IN
4
06626-001
APPLICATIONS
Telecommunications
Microprocessor systems
Desktop and notebook computers
Data storage equipment
Servers/workstations
0.62V REF
Figure 1.
GENERAL DESCRIPTION
The ADM6710 is a low voltage, high accuracy supervisory
circuit. The device monitors up to four system supply voltages.
The ADM6710 incorporates a variety of internally pretrimmed
undervoltage threshold options for monitoring 1.8 V, 2.5 V,
3.0 V, 3.3 V and 5.0 V supply voltages. The ADM6710Q offers
three adjustable thresholds for monitoring voltages down to
0.62 V. See the Ordering Guide section for a list and description
of all available options.
If a monitored power supply voltage falls below the minimum
voltage threshold, a single active low output asserts, triggering a
system reset. The output is open drain with a weak internal
pull-up to the monitored IN
2
supply (or to V
CC
in the case of the
ADM6710Q) of typically 10 μA. Once all voltages rise above the
selected threshold level, the reset signal remains low for the
reset timeout period (200 ms typical).
The ADM6710 output remains valid as long as IN
1
or IN
2
exceeds 1 V, whereas for the ADM6710Q, the output remains
valid as long as V
CC
exceeds 2 V.
Unused monitored inputs should not be allowed to float or to
be grounded, instead they should be connected to a supply
voltage greater than their specified threshold voltages.
The ADM6710 is available in a 6-lead SOT-23 package. The
device operates over the extended temperature range of −40°C
to +85°C.
Rev. A
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 ©2007–2010 Analog Devices, Inc. All rights reserved.
ADM6710
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution .................................................................................. 4
Pin Configurations and Function Descriptions ........................... 5
Typical Performance Characteristics ..............................................6
Theory of Operation .........................................................................8
Input Configuration ......................................................................8
RESET Output Configuration .....................................................8
Addition Of Manual Reset ...........................................................8
Outline Dimensions ..........................................................................9
Ordering Guide .............................................................................9
REVISION HISTORY
10/10—Rev. 0 to Rev. A
Added Figure 17................................................................................ 9
6/07—Revision 0: Initial Version
Rev. A | Page 2 of 12
ADM6710
SPECIFICATIONS
V
IN2
= 1 V to 5.5 V, T
A
= −40°C to +85°C, unless otherwise noted. Typical values are V
IN2
= 3.0 V to 3.3 V, T
A
= 25°C.
Table 1.
Parameter
OPERATING VOLTAGE RANGE
V
CC 1
V
IN2 2
INPUT CURRENT
IN
x
Input Current
Min
2.0
1.0
1.2
25
55
Typ
Max
5.5
5.5
5.5
40
115
Units
V
V
V
μA
μA
Test Conditions/Comments
ADM6710Q only
All devices except ADM6710Q; T
A
= 0°C to +85°C
All devices except ADM6710Q; T
A
= −40°C to +85°C
IN
X
= nominal input voltage (for 1.8 V, 2.5 V and 5.0 V
supplies)
IN
2
= nominal input voltage (for 3.0 V and 3.3 V
supplies); the supply splits into 25 μA for the resistor
divider and 30 μA for other circuits
V
IN1
= 0 V to 0.85 V (for adjustable thresholds)
V
IN3
, V
IN4
= 0 V to 0.85 V (for adjustable thresholds)
ADM6710Q only; V
CC
= 5.5 V
IN
X
decreasing; 5 V (−5%)
IN
X
decreasing; 5 V (−10%)
IN
X
decreasing; 3.3 V (−5%)
IN
X
decreasing; 3.3 V (−10%)
IN
X
decreasing; 3.0 V (−5%)
IN
X
decreasing; 3.0 V (−10%)
IN
X
decreasing; 2.5 V (−5%)
IN
X
decreasing; 2.5 V (−10%)
IN
X
decreasing; 1.8 V (−5%)
IN
X
decreasing; 1.8 V (−10%)
IN
X
decreasing
IN
X
increasing relative to IN
X
decreasing
I
CC
Input Current
THRESHOLD VOLTAGE
Threshold Voltage (V
TH
)
35
4.50
4.25
3.00
2.85
2.70
2.55
2.25
2.13
1.62
1.53
0.611
4.63
4.38
3.08
2.93
2.78
2.63
2.32
2.19
1.67
1.58
0.620
0.3
60
30
200
0.4
0.2
50
4.75
4.50
3.15
3.00
2.85
2.70
2.38
2.25
1.71
1.62
0.629
μA
μA
μA
V
V
V
V
V
V
V
V
V
V
V
%V
TH
ppm/°C
μs
ms
V
V
V
V
V
Adjustable Threshold (V
TH
)
RESET THRESHOLD HYSTERESIS (V
HYST
)
RESET THRESHOLD TEMPERATURE
COEFFICIENT (TCV
TH
)
IN
X
to RESET DELAY (t
RP
)
RESET TIMEOUT PERIOD (t
RP
)
RESET OUTPUT LOW (V
OL
)
V
IN
falling at 10 mV/μs from V
TH
to V
TH
− 50 mV
V
IN2
, V
CC
= 5 V, I
SINK
= 2 mA
V
IN2
, V
CC
= 2.5 V, I
SINK
= 1.2 mA
V
IN2
= 1.0 , I
SINK
= 20 μA, T
A
= 0°C to +85°C
V
CC
≥ 2.0 V, I
SOURCE
= 4 μA, RESET deasserted
(ADM6710Q only)
V
IN2
≥ 2.0 V, I
SOURCE
= 4 μA, RESET deasserted
V
IN2
≥ 2.0 V, RESET deasserted
140
280
0.3
0.4
0.3
RESET OUTPUT HIGH (V
OH
)
0.8 × V
CC
0.8 × V
IN2
RESET OUTPUT HIGH SOURCE CURRENT (I
OH
)
1
2
10
μA
Note that the ADM6710Q is powered from V
CC
.
The RESET output is guaranteed to be in the correct state for IN
1
or IN
2
down to 1 V.
Rev. A | Page 3 of 12
ADM6710
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
V
CC
, IN
X
, RESET to GND
Continuous RESET Current
Storage Temperature Range
Operating Temperature Range
Lead Temperature (10 sec)
Junction Temperature
Rating
−0.3 V to +6 V
20 mA
−65°C to +125°C
−40°C to +85°C
300°C
135°C
Table 3. Thermal Resistance
Package Type
6-lead SOT-23
θ
JA
169.5
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. A | Page 4 of 12
ADM6710
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
IN
1 1
6
RESET
GND
06626-002
IN
1 1
6
RESET
GND
IN
4
06626-003
ADM6710
IN
2 2
IN
3 3
TOP VIEW
(Not to Scale)
5
ADM6710Q
V
CC 2
IN
3 3
TOP VIEW
(Not to Scale)
5
4
IN
4
4
Figure 2. ADM6710 Pin Configuration
Figure 3. ADM6710Q Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
Mnemonic
IN
1
IN
2
V
CC
IN
3
IN
4
GND
RESET
Description
Input Voltage 1.
Input Voltage 2. IN
2
is the power supply input for the ADM6710.
V
CC
is the power supply input for the ADM6710Q. It is not a monitored input.
Input Voltage 3.
Input Voltage 4.
Ground.
Active Low RESET Output. RESET goes low when an input drops below the specified threshold. Once all inputs
rise above the threshold voltage, RESET remains low for 200 ms (typical) before going high. RESET is open drain
with a weak internal pull-up to IN
2
or, in the case of the ADM6710Q, to V
CC
, typically 10 μA.
Rev. A | Page 5 of 12
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