ANALOG DEVICES ADM6305 Service Manual
Supervisory ICs
ADM6305/ADM6306
Rev. A
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RESET
GENERATOR
RESET
0.4V/1.23V
RST IN1
V
CC
GND
0.4V/1.23V
RST IN2
ADM6305
09345-001
RESET
GENERATOR
GLITCH
REJECTION
RESET
1.23V
GND
0.4V/1.23V
RST IN
MR
ADM6306
V
CC
V
CC
09345-002
Data Sheet
FEATURES
Adjustable input threshold voltage options: 0.4 V and 1.23 V
Pre-trimmed V
Increments between 2.5 V and 5 V
Manual reset input (ADM6306)
4 factory programmed reset timeout delays
1 ms, 20 ms, 140 ms, and 1.12 sec (minimum)
Reset output stage: active low, open drain
Low power consumption: 5 µA typical
Power supply glitch immunity
5-lead SOT-23 package
Temperature range: −40°C to +125°C
APPLICATIONS
Portable/battery-operated equipment
Microprocessor systems
Multivoltage applications
threshold options (ADM6306)
CC
Multiple Input Programmable
FUNCTIONAL BLOCK DIAGRAMS
Figure 1.
GENERAL DESCRIPTION
The ADM6305/ADM6306 are dual voltage supervisors
designed to monitor two supplies and provide a reset signal to
DSP- and microprocessor-based systems. Low supply current
and a small form factor make these devices suitable for portable
and battery-operated applications.
If a monitored power supply voltage falls below the minimum
voltage threshold, a single active low output asserts triggering a
system reset. Once all voltages rise above the selected threshold
level, the reset signal remains low for the reset timeout period.
Four reset timeout options are available.
The ADM6305 monitors two supplies via two adjustable
resistor-programmable undervoltage reset inputs. Both RST
IN1 and RST IN2 have a reset threshold of either 0.4 V or
1.23 V depending on the particular model; that is, the RST IN1
and RST IN2 threshold of the ADM6305DxARJZ model is
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 n otice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Figure 2.
1.23 V, while in the case of ADM6305DxARJZ1 model, it is
0.4 V. The V
input of the ADM6305 is not a monitored input.
CC
The ADM6306 has one adjustable undervoltage reset input,
RST IN, which features a choice of reset threshold, 0.4 V or
1.23 V (see the Ordering Guide for more information). The
ADM6306 incorporates a variety of internally pretrimmed V
undervoltage threshold options for monitoring supply voltages
in increments between 2.5 V and 5 V. The ADM6306 also
includes a manual reset input.
The ADM6305/ADM6306
as V
exceeds 0.9 V.
CC
RESET
output remains valid as long
The ADM6305/ADM6306 are available in a 5-lead SOT-23
package. These devices are specified over the temperature range
of −40°C to +125°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
CC
ADM6305/ADM6306 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagrams ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
Thermal Resistance ...................................................................... 4
ESD Caution .................................................................................. 4
REVISION HISTORY
4/12—Rev. 0 to Rev. A
Changes to Figure 1 and Figure 2 ................................................... 1
Change to V
Changes to Table 9 .......................................................................... 10
Updated Outline Dimensions ....................................................... 11
Changes to Ordering Guide .......................................................... 11
10/10—Revision 0: Initial Version
Pin Description, Tabl e 5 ........................................ 5
CC
Pin Configurations and Function Descriptions ............................5
Typical Performance Characteristics ..............................................6
Theory of Operation .........................................................................8
Input Configuration ......................................................................8
Reset Output Configuration ........................................................8
Manual Reset ..................................................................................8
Options ...............................................................................................9
Outline Dimensions ....................................................................... 11
Ordering Guide .......................................................................... 11
Rev. A | Page 2 of 12
Data Sheet ADM6305/ADM6306
1
0.9 V VCC that guarantees valid output
ADM630xD1
1.0
1.4
2.0
ms
ADM630xD4
1120
1570
2240
ms
SINK
SINK
RSTH
RST IN
RSTH
0.4 V ADJUSTABLE RESET COMPARTOR INPUT
RST INx
SPECIFICATIONS
VCC = 2.5 V to 5 V for the ADM6305, VCC = (VTH + 2.5%) to 5.5 V for the ADM6306. TA = −40°C to +125°C, unless otherwise noted.
Typ i cal values are at T
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
OPERATING VOLTAGE RANGE, V
INPUT CURRENT, ICC 5 16 µA VCC = 5.5 V, TA = −40°C to +85°C
5 20 µA VCC = 5.5 V, TA = −40°C to +125°C
VCC THRESHOLD VOLTAGE (ADM6306)2 VTH − 1% VTH VTH + 1% V TA = 25°C
VTH − 1.5% VTH VTH + 1.5% V TA = −40°C to +85°C
VTH − 2.5% VTH VTH + 2.5% V TA = −40°C to +125°C
RESET THRESHOLD TEMPERATURE COEFFICIENT 25 ppm/°C
RESET THRESHOLD HYSTERESIS (V
RESET
TIMEOUT PERIOD (tRP)
ADM630xD2 20 28 40 ms
ADM630xD3 140 200 280 ms
= 25°C.
A
0.9 5.5 V
CC
) 2 × V
HYST
mV
TH
RESET
OUTPUT VOLTAGE (VOL)
0.3 V VCC > 2.5 V, I
0.3 V VCC > 1.2 V, I
0.3 V VCC > 1 V, I
0.3 V VCC > 0.9 V, I
MR
INPUT (ADM6306)
0.4 V
V
> 4.25 V, I
CC
= 3.2 mA
SINK
= 1.2 mA
SINK
= 500 μA
= 50 μA
= 25 μA
SINK
VIL 0.8 V VTH > 4.0 V
0.3 × VCC V VTH < 4.0 V
VIH 2.4 V VTH > 4.0 V
0.7 × VCC V VTH < 4.0 V
MR
Minimum Input Pulse Width
1 µs T
= 0°C to +70°C
A
1.5 µs TA = −40°C to +125°C
MR
Glitch Rejection
MR
To Reset Delay
MR
Pull-Up Resistance
0.1 µs
500 ns
32 63.5 100 kΩ
1.23 V ADJUSTABLE RESET COMPARATOR INPUT
RST INx Input Threshold, V
1.22 1.23 1.24 V TA = 25°C
1.211 1.23 1.249 TA = −40°C to +85°C
1.20 1.26 V TA = −40°C to +125°C
RST INx Input Current, I
−25 +25 nA V
−25 +25 nA 0 V < V
RST INx
< VCC – 0.3 V3, TA = −40°C to +85°C
RST IN
= V
RST INx Hysteresis 2.5 mV
RST INx Input Threshold, V
0.396 0.40 0.404 V TA = 25°C
RSTH
0.394 0.40 0.406 V TA = −40°C to +85°C
0.39 0.40 0.41 V TA = −40°C to +125°C
RST INx Input Current, I
−25 +25 nA V
1
The ADM6305 switches from undervoltage reset to normal operation when 1.5 V > VCC < 2.5 V.
2
The AMD6306 monitors VCC through an internal factory trimmed voltage divider, which programs the nominal reset threshold. Factory-trimmed reset thresholds are
available in approximately 100 mV increments from 2.5 V to 5 V.
3
Guaranteed by design.
−25 +25 nA
RST INx
0 V < V
RST IN
< VCC – 0.3 V3, TA = −40°C to +85°C
= V
RSTH
Rev. A | Page 3 of 12
ADM6305/ADM6306 Data Sheet
All Pins (Except VCC)
−0.3 V to (VCC + 0.3 V)
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
VCC −0.3 V to +6 V
Input/Output Current 20 mA
Rate of Rise, VCC 100 V/µs
Storage Temperature Range −65°C to +160°C
Operating Temperature Range −40°C to +125°C
Lead Temperature (10 sec) 300°C
Junction Temperature 150°C
THERMAL RESISTANCE
Table 3.
Package Type θJA Unit
5-Lead SOT-23 240 °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 and 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
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