ANALOG DEVICES ADM13305 Service Manual
Dual Processor
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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 V
Push-pull RESET and
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,
exceeds 1.1 V. The device then monitors the SENSEv input pins
and holds the
inputs remains below the rising threshold voltage, V
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 associated falling threshold, V
ADM13305 features both an active high RESET and an active
RESET
low
output.
≥ 1.1 V
DD
RESET
outputs
RESET
is asserted when the supply voltage
RESET
output low as long as either of the SENSEv
RESET
IT−
, the
output asserts. The
IT+
.
Supervisors with Watchdog
ADM13305
FUNCTIONAL BLOCK DIAGRAMS
ADM13305-18
V
DD
14kΩ
MR
SENSE1
SENSE2
GND
SENSE1
GND
SENSE2
WDI
V
MR
WDI
R1
R2
R3
DD
R1
TRANSITIO N
DETECTIO N
14kΩ
R2
TRANSITIO N
DETECTIO N
R4
1.25V
0.6V
WATCHDOG
LOGIC + TIMER
Figure 1.
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.
ADM13305-25
ADM13305-33
RESET
LOGIC + TIMER
OSCILLATOR
ADM13305-4
ADM13305-5
RESET
LOGIC + TIMER
OSCILLATOR
RESET
RESET
RESET
RESET
06922-002
06922-001
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.
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 Analog Devices, Inc. All rights reserved.
ADM13305
www.BDTIC.com/ADI
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagrams ............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Timing Requirements .................................................................. 5
Switching Characteristics ............................................................ 5
Functional Truth Table ................................................................ 5
Absolute Maximum Ratings ............................................................ 6
Thermal Resistance ...................................................................... 6
REVISION HISTORY
8/07—Revision 0: Initial Version
ESD Caution...................................................................................6
Pin Configuration and Function Descriptions ..............................7
Typical Performance Characteristics ..............................................8
Theory of Operation ...................................................................... 10
Input Configuration ................................................................... 10
Reset Output ............................................................................... 10
Watchdog Timer ......................................................................... 10
Manual Reset (MR) .................................................................... 11
Outline Dimensions ....................................................................... 12
Ordering Guide .......................................................................... 12
Rev. 0 | Page 2 of 12
ADM13305
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SPECIFICATIONS
VDD = 2.7 V to 5.5 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 1. ADM13305-18, ADM13305-25, and ADM13305-33
Parameter Min Typ Max Unit Test Conditions/Comments
OPERATING VOLTAGE RANGE, VDD 2.7 5.5 V
SUPPLY CURRENT, IDD 40 µA
INPUT CAPACITANCE, CI 10 pF VI = 0 V to VDD
RESET, RESET OUTPUT
High Level Output Voltage, VOH V
V
V
Low Level Output Voltage, VOL 0.2 V IOL = 20 µA
0.4 V IOL = 2 mA, VDD = 3.3 V
0.4 V IOL = 3 mA, VDD = 5.5 V
Power-Up Reset Voltage
1
SENSE INPUTS
Falling Threshold Voltage, V
1.64 1.68 1.72 V TA = 0°C to 85°C
IT−
2.20 2.25 2.30 V TA = 0°C to 85°C
2.86 2.93 3.00 V TA = 0°C to 85°C
4.46 4.55 4.64 V TA = 0°C to 85°C
1.64 1.68 1.73 V TA = −40°C to +85°C
2.20 2.25 2.32 V TA = −40°C to +85°C
2.86 2.93 3.02 V TA = −40°C to +85°C
4.46 4.55 4.67 V TA = −40°C to +85°C
Hysteresis at SENSEv Inputs, V
15 mV V
HYS
20 mV V
30 mV V
40 mV V
WDI
Average High Level Input Current, I
Average Low Level Input Current, I
100 150 µA WDI = VDD = 5.5 V
H(AV)
−15 −20 µA WDI = 0 V, VDD = 5.5 V
L(AV)
INPUT VOLTAGE AT MR AND WDI
High Level, VIH 0.7 × VDD V
Low Level, VIL 0.3 × VDD V
INPUT TRANSITION RISE AND FALL RATE AT MR
HIGH LEVEL INPUT CURRENT, IH
WDI 120 170 µA WDI = VDD = 5.5 V
MR
SENSE1 5 8 µA SENSE1 = VDD = 5.5 V
SENSE2 6 9 µA SENSE2 = VDD = 5.5 V
LOW LEVEL INPUT CURRENT, IL
WDI −120 −170 µA WDI = 0 V, VDD = 5.5 V
MR
SENSEv −1 +1 µA SENSE1, SENSE2 = 0 V
1
The lowest supply voltage at which
RESET
becomes active. t
− 0.2 V IOH = −20 µA
DD
− 0.4 V IOH = −2 mA, VDD = 3.3 V
DD
− 0.4 V IOH = −3 mA, VDD = 5.5 V
DD
0.4 V IOL = 20 µA, VDD ≥ 1.1 V
= 1.68 V
IT−
= 2.25 V
IT−
= 2.93 V
IT−
= 4.55 V
IT−
50 ns/V
−130 −180 µA
−430 −600 µA
, VDD ≥ 15 s/V.
r
= 0.7 × VDD, VDD = 5.5 V
MR
= 0 V, VDD = 5.5 V
MR
Rev. 0 | Page 3 of 12
ADM13305
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VDD = 2.7 V to 5.5 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 2. ADM13305-4 and ADM13305-5
Parameter Min Typ Max Unit Test Conditions/Comments
OPERATING VOLTAGE RANGE, VDD 2.7 5.5 V
SUPPLY CURRENT, IDD 40 µA
INPUT CAPACITANCE, CI 10 pF VI = 0 V to VDD
RESET, RESET OUTPUT
High-Level Output Voltage, VOH V
V
V
Low-Level Output Voltage, VOL 0.2 V IOH = 20 µA
0.4 V IOH = 2 mA, VDD = 3.3 V
0.4 V IOH = 3 mA, VDD = 5.5 V
Power-Up Reset Voltage
1
SENSEv INPUTS
Falling Input Threshold Voltage, V
0.5952 0.6 0.6048 V TA = −40°C to +85°C
IT−
2.23 2.25 2.29 V TA = −40°C to +85°C
2.90 2.93 2.98 V TA = −40°C to +85°C
Hysteresis at SENSEv Inputs, V
0 mV V
HYS
20 mV V
30 mV V
WDI
Average High Level Input Current, I
Average Low Level Input Current, I
100 150 µA WDI = VDD = 5.5 V
H(AV)
−15 −20 µA WDI = 0 V, VDD = 5.5 V
L(AV)
INPUT VOLTAGE AT MR AND WDI
High Level, VIH 0.7 × VDD V
Low Level, VIL 0.3 × VDD V
INPUT TRANSITION RISE AND FALL RATE AT MR
HIGH LEVEL INPUT CURRENT, IH
WDI 120 170 µA WDI = VDD = 5.5 V
MR
SENSE1 5 8 µA SENSE1 = VDD = 5.5 V
SENSE2 −50 +50 nA SENSE2 = VDD = 5.5 V
LOW LEVEL INPUT CURRENT, IL
WDI −120 −170 µA WDI = 0 V, VDD = 5.5 V
MR
SENSEv −1 +1 µA SENSE1, SENSE2 = 0 V
1
The lowest supply voltage at which
RESET
becomes active. tr, VDD ≥ 15 µs/V.
− 0.2 V IOH = −20 µA
DD
− 0.4 V IOH = −2 mA, VDD = 3.3 V
DD
− 0.4 V IOH = −3 mA, VDD = 5.5 V
DD
0.4 V IOH = 20 µA, VDD ≥ 1.1 V
= 0.6 V
IT−
= 2.25 V
IT−
= 2.93 V
IT−
50 ns/V
−130 −180 µA
−430 −600 µA
= 0.7 × VDD, VDD = 5.5 V
MR
= 0 V, VDD = 5.5 V
MR
Rev. 0 | Page 4 of 12
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