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PDF ADM8710 Data sheet ( Hoja de datos )
| Número de pieza | ADM8710 | |
| Descripción | Quad Voltage Microprocessor Supervisory Circuit | |
| Fabricantes | Analog Devices | |
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Data Sheet
Low Voltage, High Accuracy, Quad Voltage
Microprocessor Supervisory Circuit
ADM8710
FEATURES
Accurate monitoring of up to four power supply voltages
2 factory-set threshold options for monitoring 1.8 V and 3.3 V
Adjustable input threshold voltage 0.62 V (±1.5% accuracy)
50 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
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
IN1
ADM8710
IN2
IN2
RESET
RESET
TIMEOUT
IN3 UVLO
IN4
0.62VREF
Figure 1.
GENERAL DESCRIPTION
The ADM8710 is a low voltage, high accuracy supervisory circuit.
The device monitors up to four system supply voltages.
The ADM8710 incorporates two internally pretrimmed under-
voltage threshold options for monitoring 1.8 V and 3.3 V supply
voltages. It also offers two adjustable inputs with 0.62 V internal
reference, allowing users to program the reset threshold through
external resistor dividers. The combination of pretrimmed and
adjustable inputs gives the ADM8710 the advantage of being
both space saving and flexible.
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 of typically 10 µA. When
all voltages rise above the selected threshold level, the RESET
signal remains low for the reset timeout period. The ADM8710
output remains valid as long as IN1 or IN2 exceeds 1 V.
Unused monitored inputs should not be allowed to float or to
be grounded. Instead, connect them to a supply voltage greater
than their specified threshold voltages.
The ADM8710 is available in a 6-lead SOT-23 package. The
device operates over the extended temperature range of −40°C
to +85°C.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2012 Analog Devices, Inc. All rights reserved.
1 page  
ADM8710
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
INX, 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
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
6-lead SOT-23
θJA
169.5
ESD CAUTION
Data Sheet
Unit
°C/W
Rev. 0 | Page 4 of 12
5 Page 
ADM8710
Data Sheet
MODEL OPTIONS
Table 5. Reset Voltage Threshold Options
Reset
Threshold
Code1
IN1
Nominal
Input
Supply
Voltage (V) Tolerance (%)
IN2
Nominal
Input
Supply
Voltage (V) Tolerance (%)
L
Adjustable Not applicable 3.3
−5
IN3
Nominal
Input
Supply
Voltage (V) Tolerance (%)
1.8 −2
IN4
Nominal
Input
Supply
Voltage (V) Tolerance (%)
Adjustable Not applicable
1 Adjustable voltage based on 0.62 V internal threshold. The external threshold voltage can be set using an external resistor divider.
Table 6. Reset Timeout Options
Reset Timeout Period Code1
ADM8710x2
1 x = do not care.
TA = −40°C to +85°C
Min Typ Max
35 50 70
ADM8710L2ARJZ-RL7
RESET THRESHOLD CODE
RESET TIMEOUT PERIOD CODE
2 = 50ms TYPICAL
TEMPERATURE RANGE
A: –40°C TO +85°C
PACKING MATERIAL
RL7 = 7” TAPE AND REEL
(3000 PIECE QUANTITY)
Z = LEAD-FREE
PACKAGE DESIGNATOR
RJ = SOT-23
Figure 16. ADM8710 Ordering Code Structure
Unit
ms
Rev. 0 | Page 10 of 12
11 Page | ||
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