Low Voltage, High Accuracy, Triple/Quad
Voltage Microprocessor Supervisory Circuit
ADM6710
Rev. A
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Trademarks and registered trademarks are the property of their respective owners.
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Fax: 781.461.3113 ©2007–2010 Analog Devices, Inc. All rights reserved.
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 IN1 = 1 V or IN2 = 1 V
Low power consumption (35 μA)
Power supply glitch immunity
Specified from −40°C to +85°C
6-lead SOT-23 package
APPLICATIONS
Telecommunications
Microprocessor systems
Desktop and notebook computers
Data storage equipment
Servers/workstations
FUNCTIONAL BLOCK DIAGRAM
200ms
TIMEOUT
UVLO
IN2, VCC
0.62V REF
ADM6710
RESET
IN1
IN2,
V
CC
IN3
IN4
06626-001
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 IN2 supply (or to VCC 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 IN1 or IN2
exceeds 1 V, whereas for the ADM6710Q, the output remains
valid as long as VCC 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.
ADM6710
Rev. A | Page 2 of 12
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
ADM6710
Rev. A | Page 3 of 12
SPECIFICATIONS
VIN2 = 1 V to 5.5 V, TA = −40°C to +85°C, unless otherwise noted. Typical values are VIN2 = 3.0 V to 3.3 V, TA = 25°C.
Table 1.
Parameter Min Typ Max Units Test Conditions/Comments
OPERATING VOLTAGE RANGE
VCC1 2.0 5.5 V ADM6710Q only
VIN2 2 1.0 5.5 V All devices except ADM6710Q; TA = 0°C to +85°C
1.2 5.5 V All devices except ADM6710Q; TA = −40°C to +85°C
INPUT CURRENT
INx Input Current 25 40 μA
INX = nominal input voltage (for 1.8 V, 2.5 V and 5.0 V
supplies)
55 115 μA
IN2 = 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
0.4 μA VIN1 = 0 V to 0.85 V (for adjustable thresholds)
0.2 μA VIN3, V IN4 = 0 V to 0.85 V (for adjustable thresholds)
ICC Input Current 35 50 μA ADM6710Q only; VCC = 5.5 V
THRESHOLD VOLTAGE
Threshold Voltage (VTH) 4.50 4.63 4.75 V INX decreasing; 5 V (−5%)
4.25 4.38 4.50 V INX decreasing; 5 V (−10%)
3.00 3.08 3.15 V INX decreasing; 3.3 V (−5%)
2.85 2.93 3.00 V INX decreasing; 3.3 V (−10%)
2.70 2.78 2.85 V INX decreasing; 3.0 V (−5%)
2.55 2.63 2.70 V INX decreasing; 3.0 V (−10%)
2.25 2.32 2.38 V INX decreasing; 2.5 V (−5%)
2.13 2.19 2.25 V INX decreasing; 2.5 V (−10%)
1.62 1.67 1.71 V INX decreasing; 1.8 V (−5%)
1.53 1.58 1.62 V INX decreasing; 1.8 V (−10%)
Adjustable Threshold (VTH) 0.611 0.620 0.629 V INX decreasing
RESET THRESHOLD HYSTERESIS (VHYST) 0.3 %VTH INX increasing relative to INX decreasing
RESET THRESHOLD TEMPERATURE
COEFFICIENT (TCVTH)
60 ppm/°C
INX to RESET DELAY (tRP) 30 μs VIN falling at 10 mV/μs from VTH to VTH − 50 mV
RESET TIMEOUT PERIOD (tRP) 140 200 280 ms
RESET OUTPUT LOW (VOL) 0.3 V
VIN2, VCC = 5 V, ISINK = 2 mA
0.4 V VIN2, VCC = 2.5 V, ISINK = 1.2 mA
0.3 V
VIN2 = 1.0 , ISINK = 20 μA, TA = 0°C to +85°C
RESET OUTPUT HIGH (VOH) 0.8 × VCC V VCC ≥ 2.0 V, ISOURCE = 4 μA, RESET deasserted
(ADM6710Q only)
0.8 × VIN2 V VIN2 ≥ 2.0 V, ISOURCE = 4 μA, RESET deasserted
RESET OUTPUT HIGH SOURCE CURRENT (IOH) 10 μA
VIN2 ≥ 2.0 V, RESET deasserted
1 Note that the ADM6710Q is powered from VCC.
2 The RESET output is guaranteed to be in the correct state for IN1 or IN2 down to 1 V.
ADM6710
Rev. A | Page 4 of 12
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
VCC, INX, RESET to GND −0.3 V to +6 V
Continuous RESET Current 20 mA
Storage Temperature Range −65°C to +125°C
Operating Temperature Range −40°C to +85°C
Lead Temperature (10 sec) 300°C
Junction Temperature 135°C
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.
Table 3. Thermal Resistance
Package Type θJA Unit
6-lead SOT-23 169.5 °C/W
ESD CAUTION
ADM6710
Rev. A | Page 5 of 12
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
IN11
IN22
RESET6
GND5
IN33
ADM6710
TOP VI EW
IN4
4
(No t t o S cale)
06626-002
Figure 2. ADM6710 Pin Configuration
IN
11
V
CC 2
IN
33
RESET
6
GND
5
IN
4
4
ADM6710Q
TOP VIEW
(No t to S cal e)
06626-003
Figure 3. ADM6710Q Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1 IN1 Input Voltage 1.
2 IN2 Input Voltage 2. IN2 is the power supply input for the ADM6710.
V
CC V
CC is the power supply input for the ADM6710Q. It is not a monitored input.
3 IN3 Input Voltage 3.
4 IN4 Input Voltage 4.
5 GND Ground.
6 RESET 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 IN2 or, in the case of the ADM6710Q, to VCC, typically 10 μA.
ADM6710
Rev. A | Page 6 of 12
TYPICAL PERFORMANCE CHARACTERISTICS
VIN2 = VCC = 3.0V, TA = 25°C, unless otherwise noted.
60
40
–40 85
06626-008
TEMPERATURE (ºC)
IN
2
INPUT CURRENT ( µ A)
58
56
54
52
50
48
46
44
42
–15 10 35 60
V
IN
2 = 3. 3V
V
IN
2 = 3V
Figure 4. IN2 Input Current vs. Temperature
120
005
06626-009
IN2 VOLTAGE (V)
IN
2
INPUT CURRENT ( µ A)
.5
100
80
60
40
20
.5 11.522.533.544.55
Figure 5. IN2 Input Current vs. IN2 Voltage
0.05
–0.35
–40 85
06626-010
TE M P ERATURE (ºC)
NORMALIZED T HE RS HOLD E RROR (%)
0
–0.05
–0.1
–0.15
–0.2
–0.25
–0.3
–15 10 35 60
VTH = 1.8V
VIN2 = 3. 3V
Figure 6. Normalized Threshold Error vs. Temperature
100
001
06626-011
RESET THRESHOLD O V ERDRIVE (mV)
MAXIMUM INX TRANS IENT DURAT ION ( µs)
000
90
80
70
60
50
40
30
20
10
100 200 300 400 500 600 700 800 900
RESET ASS ERTED ABOV E T HI S LINE
Figure 7. Maximum INx Transient Duration vs. Reset Threshold Overdrive
100
001
06626-012
RESET THRESHOLD O V ERDRIVE (mV)
000
90
80
70
60
50
40
30
20
10
100 200 300 400 500 600 700 800 900
RESET DELAY (µs)
Figure 8. RESET Delay vs. Reset Threshold Overdrive (INx Decreasing)
214
202
–40 85
06626-013
TE M P ERATURE (ºC)
RESET TIMEOUT DELAY (mS)
212
210
208
206
204
–15103560
Figure 9. Reset Timeout Delay vs. Temperature
ADM6710
Rev. A | Page 7 of 12
C3
C2
06626-014
C2 DC1M
2.00V/div
–6.000V offs et
BwL C3 DC1M
1.00V/div
2.040V offset
BwL Timebase 0.0µs
10.0 µs/div
2.0 GS/ s200kS
Trigger 0.0µs
–520mVSTOP NEGATIVEEDGE
INx
RESET
Figure 10. RESET Pull-Up and Pull-Down Response (10 μs/div)
C3
C2
06626-015
C2 DC1M
2.00V/div
–6.000V offset
BwL C3 2.00V/div
2.000V offset
BwL 50.0 ms/div
1.0 MS/ s500kS
Trigger DC
680mVNormal PositiveEdge
DC1M –101ms C3Timebase
INx
RESET
Figure 11. RESET Timeout Delay (50 ms/div)
ADM6710
Rev. A | Page 8 of 12
THEORY OF OPERATION
The ADM6710 is a compact, low power supervisory circuit
capable of monitoring up to four voltages in a multisupply
application.
The device includes several factory-set voltage threshold
options for monitoring 1.8 V, 2.5 V, 3.0 V, 3.3 V and 5.0 V
supplies. It also provides up to 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.
The ADM6710Q has three adjustable voltage inputs and is
powered by VCC, which is not a monitored voltage. All other
ADM6710 devices are powered by IN2, which is a monitored
voltage, and therefore monitors up to four voltages. If a monitored
voltage drops below its associated threshold, the active low reset
output asserts low and remains low while either IN1 or IN2 remains
above 1.0 V.
MONITORED
SUPPLIES MICROPROCESSOR
06626-004
ADM6710
IN
1
IN
2
IN
3
IN
4
GND
RESET
Figure 12. Typical Applications Circuit
INPUT CONFIGURATION
The ADM6710 provides numerous monitor choices with
adjustable reset thresholds. Typically, the threshold voltage at
each adjustable INx input is 0.62 V. To monitor a voltage greater
than 0.62 V, connect a resistor divider network to the circuit as
depicted in Figure 13, where
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛+
=
2
21
62.0 R
RR
VVINTH
R1
R2
V
INTH
VREF = 0.62V
06626-006
Figure 13. Setting the Adjustable Monitor
The internal comparators each typically have a hysteresis of 0.3%
with respect to the reset threshold. This built-in hysteresis
improves the device’s immunity to ambient noise without
noticeably reducing the threshold accuracy. The ADM6710
is unaffected by short input transients.
The ADM6710 is powered from the monitored IN2, or VCC in the
case of the ADM6710Q. Monitored inputs are resistant to short
power supply glitches. Figure 7 depicts the ADM6710 glitch
immunity data. To increase noise immunity in noisy applications,
place a 0.1 μF capacitor between the IN2 input and ground.
Adding capacitance to IN1, IN3, and IN4 also improves noise
immunity.
Do not allow unused monitor inputs to float or to be grounded.
Connect these inputs to a supply voltage greater than their specified
threshold voltages. In the case of unused INx adjustable inputs,
limit the bias current by connecting a 1 MΩ series resistor between
the unused input and IN2 (or VCC in the case of the ADM6710Q).
RESET OUTPUT CONFIGURATION
The RESET output asserts low if a monitored INx voltage drops
below its voltage threshold. Once all voltages rise above the
selected threshold level, the reset signal remains low for the
reset timeout period (200 ms typical). The reset output is open
drain with a weak internal pull-up to the monitored IN2 or VCC
supply, typically 10 μA.
Many applications that interface with other logic devices do not
require an external pull-up resistor. However, if an external
pull-up resistor is required and it is connected to a voltage
ranging from 0 V to 5.5 V, it will overdrive the internal pull-up.
Reverse current flow from the external pull-up voltage to IN2 is
prevented by the internal circuitry.
ADM6710
RESET
06626-005
RESET
V
CC
5
V
100kΩ
IN
2
=3.3
V
Figure 14. Interface with a Different Logic Supply Voltage
ADDITION OF MANUAL RESET
Use the circuit shown in Figure 15 to add manual reset to any of
the ADM6710 adjustable inputs. When the switch is closed, the
analog input shorts to ground and a RESET output commences.
The switch must remain open for a minimum of 140 ms for the
RESET output to deassert.
ADM6710
IN
1
IN
2
IN
3
IN
4
GND
RESET
06626-007
R1
R2
V
IN4
Figure 15. Addition of Manual Reset (IN4 is an Adjustable Input)
ADM6710
Rev. A | Page 9 of 12
OUTLINE DIMENSIONS
1 3
45
2
6
2.90 BSC
1.60 BSC 2.80 BS C
1.90
BSC
0.95 BSC
0.22
0.08 10°
4°
0°
0.50
0.30
0.15 MAX
1.30
1.15
0.90
SEATING
PLANE
1.45 MAX
0.60
0.45
0.30
PIN 1
INDICATOR
COMPLIANT TO JEDEC STANDARDS MO-178-AB
Figure 16. 6-Lead Small Outline Transistor Package [SOT-23]
(RJ-6)
Dimensions shown in millimeters
06626-016
ROUND SP ROCKET HOLE S
DIRECTION OF FEED
PIN 1 M ARKER
Figure 17. ADM6710 Reel Orientation
ORDERING GUIDE
Model1, 2
Nominal Input Voltage Supply
Tolerance (%)
Temperature
Range
Package
Description
Package
Option Branding IN1 IN2 IN3 IN4
ADM6710AARJZ-REEL7 5 3.3 2.5 Adj. 10 −40°C to +85°C 6-Lead SOT-23 RJ-6 MA9
ADM6710BARJZ-REEL7 5 3.3 2.5 Adj. 5 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAH
ADM6710CARJZ-REEL7 5 3.3 1.8 Adj. 10 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAJ
ADM6710DARJZ-REEL7 5 3.3 1.8 Adj. 5 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAK
ADM6710EARJZ-REEL7 Adj. 3.3 2.5 1.8 10 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAX
ADM6710FARJZ-REEL7 Adj. 3.3 2.5 1.8 5 −40°C to +85°C 6-Lead SOT-23 RJ-6 MA4
ADM6710GARJZ-REEL7 5 3.3 Adj. Adj. 10 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAL
ADM6710HARJZ-REEL7 5 3.3 Adj. Adj. 5 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAM
ADM6710IARJZ-REEL7 Adj. 3.3 2.5 Adj. 10 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAN
ADM6710JARJZ-REEL7 Adj. 3.3 2.5 Adj. 5 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAP
ADM6710KARJZ-REEL7 Adj. 3.3 1.8 Adj. 10 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAQ
ADM6710LARJZ-REEL7 Adj. 3.3 1.8 Adj. 5 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAR
ADM6710MARJZ-REEL7 Adj. 3 2.5 Adj. 10 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAS
ADM6710NARJZ-REEL7 Adj. 3 2.5 Adj. 5 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAT
ADM6710OARJZ-REEL7 Adj. 3 1.8 Adj. 10 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAU
ADM6710PARJZ-REEL7 Adj. 3 1.8 Adj. 5 −40°C to +85°C 6-Lead SOT-23 RJ-6 MAV
ADM6710QARJZ-REEL7 Adj. VCC Adj. Adj. Not applicable −40°C to +85°C 6-Lead SOT-23 RJ-6 MAW
1 Z = RoHS Compliant Part.
2 Adjustable voltage based on 0.62 V internal threshold. The external threshold voltage can be set using an external resistor divider.
ADM6710
Rev. A | Page 10 of 12
NOTES
ADM6710
Rev. A | Page 11 of 12
NOTES
ADM6710
Rev. A | Page 12 of 12
NOTES
©2007–2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06626-0-10/10(A)
