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ADM13305 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM13305
Beschreibung Dual Processor Supervisors
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 12 Seiten
ADM13305 Datasheet, Funktion
FEATURES
Dual supervisory circuits
Supply voltage range of 2.7 V to 5.5 V
Pretrimmed threshold options: 1.8 V, 2.5 V, 3.3 V, and 5 V
Adjustable 0.6 V voltage reference
Maximum supply current of 40 μA
140 ms (minimum) reset timeout
Watchdog timer with 1.6 sec (typical) timeout
RESET valid from VDD ≥ 1.1 V
Push-pull RESET and RESET outputs
8-lead, narrow body SOIC package
Temperature range: −40°C to +85°C
APPLICATIONS
Supervising DSPs/microcontrollers
Industrial and portable equipment
Wireless systems
Notebook/desktop computers
GENERAL DESCRIPTION
The ADM13305 is a dual voltage supervisor designed to
monitor two supplies and provide a reset signal to DSP and
microprocessor-based systems.
There are five models available, all of which feature a combination
of internally pretrimmed undervoltage threshold options for
monitoring 1.8 V, 2.5 V, 3.3 V, and 5 V supplies. There is also
an adjustable input option with an undervoltage threshold voltage
of 0.6 V.
The ADM13305-18, ADM13305-25, and ADM13305-33 models
have two internally fixed thresholds. The ADM13305-4 and
ADM13305-5 offer one internally fixed threshold and one
externally programmable threshold via a resistor string. See
the Ordering Guide for a list of all available options.
During power-up, RESET is asserted when the supply voltage
exceeds 1.1 V. The device then monitors the SENSEv input pins
and holds the RESET output low as long as either of the SENSEv
inputs remains below the rising threshold voltage, VIT+.
Once the supplies monitored at the SENSEv inputs rise above
their associated thresholds, the reset signal remains low for
the reset timeout period before deasserting. Subsequently, if a
voltage monitored by the SENSEv pins falls below its associ-
ated falling threshold, VIT−, the RESET output asserts. The
ADM13305 features both an active high RESET and an active
low RESET output.
Rev. 0
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
Dual Processor
Supervisors with Watchdog
ADM13305
VDD
MR
SENSE1
SENSE2
GND
FUNCTIONAL BLOCK DIAGRAMS
ADM13305-18
ADM13305-25
ADM13305-33
14k
R1 R2
RESET
LOGIC + TIMER
RESET
R3 R4
RESET
1.25V
OSCILLATOR
WDI
TRANSITION
DETECTION
WATCHDOG
LOGIC + TIMER
Figure 1.
VDD
MR
SENSE1
GND
14k
R1 R2
SENSE2
ADM13305-4
ADM13305-5
RESET
LOGIC + TIMER
RESET
RESET
WDI
0.6V
OSCILLATOR
TRANSITION
DETECTION
WATCHDOG
LOGIC + TIMER
Figure 2. .
As well as providing power-on reset signals, an on-chip watchdog
timer can reset the microprocessor if it fails to strobe within the
preset timeout period. A reset signal can also be asserted by an
external push button through the manual reset input pin.
The ADM13305 is available in an 8-lead, narrow body SOIC
package. The device operates over the extended industrial
temperature range of −40°C to +85°C.
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 Analog Devices, Inc. All rights reserved.
Free Datasheet http://www.datasheet4u.com/






ADM13305 Datasheet, Funktion
ADM13305
ABSOLUTE MAXIMUM RATINGS
Table 8.
Parameter
Supply Voltage Range, VDD
MR , WDI
SENSE1, SENSE2
RESET, RESET
Maximum Low Output Current
Maximum High Output Current
Input Clamp Current (VI < 0 V, VI > VDD)
Output Clamp Current (VO < 0 V, VO > VDD)
Operating Temperature Range
Storage Temperature Range
Lead Temperature
Soldering (10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
Rating
−0.3 V to +6 V
−0.3 V to VDD + 0.3 V
(VDD + 0.3 V)VIT/VREF
−0.3 V to +6 V
5 mA
−5 mA
±20 mA
±20 mA
−40°C to +85°C
−65°C to +150°C
300°C
215°C
220°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.
THERMAL RESISTANCE
Table 9.
Package Type
8-Lead SOIC_N (R-8)
θJA Unit
206 °C/W
ESD CAUTION
Rev. 0 | Page 6 of 12
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ADM13305 pdf, datenblatt
ADM13305
OUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)
4.00 (0.1574)
3.80 (0.1497)
8
1
5
6.20 (0.2441)
4 5.80 (0.2284)
0.25 (0.0098)
0.10 (0.0040)
1.27 (0.0500)
BSC
1.75 (0.0688)
1.35 (0.0532)
COPLANARITY
0.10 SEATING
PLANE
0.51 (0.0201)
0.31 (0.0122)
0.50 (0.0196)
0.25 (0.0099)
45°
1.27 (0.0500)
0.25 (0.0098) 0.40 (0.0157)
0.17 (0.0067)
ORDERING GUIDE
Model
ADM13305-18ARZ1
ADM13305-18ARZ-RL71
ADM13305-25ARZ1
ADM13305-25ARZ-RL71
ADM13305-33ARZ1
ADM13305-33ARZ-RL71
ADM13305-4ARZ1
ADM13305-4ARZ-RL71
ADM13305-5ARZ1
ADM13305-5ARZ-RL71
COMPLIANT TO JEDEC STANDARDS MS-012-A A
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
Figure 17. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
Nominal Supervised
Voltage
SENSE1
SENSE2
3.3 V 1.8 V
3.3 V 1.8 V
3.3 V 2.5 V
3.3 V 2.5 V
5 V 3.3 V
5 V 3.3 V
3.3 V
Adjustable 2
3.3 V
Adjustable2
2.5 V
Adjustable2
2.5 V
Adjustable2
Threshold Voltage
(Typical)
SENSE1 SENSE2
2.93 V
1.68 V
2.93 V
1.68 V
2.93 V
2.25 V
2.93 V
2.25 V
4.55 V
2.93 V
4.55 V
2.93 V
2.93 V
0.6 V
2.93 V
0.6 V
2.25 V
0.6 V
2.25 V
0.6 V
Temperature
Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
1 Z = RoHS Compliant Part.
2 0.6 V adjustable. External resistor divider determines the actual sense voltage.
Package
Description
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
Package
Option
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
R-8
©2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06922-0-8/07(0)
Rev. 0 | Page 12 of 12
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