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Data Sheet
FEATURES
Adjustable input threshold voltage options: 0.4 V and 1.23 V
Pre-trimmed V
CC
threshold options (ADM6306)
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
Multiple Input Programmable
Supervisory ICs
ADM6305/ADM6306
FUNCTIONAL BLOCK DIAGRAMS
V
CC
RST IN1
RESET
GENERATOR
0.4V/1.23V
RST IN2
RESET
ADM6305
0.4V/1.23V
09345-001
GND
Figure 1.
APPLICATIONS
Portable/battery-operated equipment
Microprocessor systems
Multivoltage applications
V
CC
1.23V
RST IN
RESET
GENERATOR
0.4V/1.23V
V
CC
RESET
ADM6306
MR
09345-002
GLITCH
REJECTION
GND
Figure 2.
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
1.23 V, while in the case of ADM6305DxARJZ1 model, it is
0.4 V. The V
CC
input of the ADM6305 is not a monitored input.
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
CC
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 RESET output remains valid as long
as V
CC
exceeds 0.9 V.
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.
Rev. A
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 ©2010–2012 Analog Devices, Inc. All rights reserved.
ADM6305/ADM6306
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
Data Sheet
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
REVISION HISTORY
4/12—Rev. 0 to Rev. A
Changes to Figure 1 and Figure 2 ................................................... 1
Change to V
CC
Pin Description, Table 5 ........................................ 5
Changes to Table 9 .......................................................................... 10
Updated Outline Dimensions ....................................................... 11
Changes to Ordering Guide .......................................................... 11
10/10—Revision 0: Initial Version
Rev. A | Page 2 of 12
Data Sheet
SPECIFICATIONS
ADM6305/ADM6306
V
CC
= 2.5 V to 5 V for the ADM6305, V
CC
= (V
TH
+ 2.5%) to 5.5 V for the ADM6306. T
A
= −40°C to +125°C, unless otherwise noted.
Typical values are at T
A
= 25°C.
Table 1.
Parameter
OPERATING VOLTAGE RANGE, V
CC 1
INPUT CURRENT, I
CC
V
CC
THRESHOLD VOLTAGE (ADM6306)
2
V
TH
− 1%
V
TH
− 1.5%
V
TH
− 2.5%
Min
0.9
0.9
Typ
Max
5.5
16
20
V
TH
+ 1%
V
TH
+ 1.5%
V
TH
+ 2.5%
Unit
V
V
µA
µA
V
V
V
ppm/°C
mV
ms
ms
ms
ms
V
V
V
V
V
V
V
V
V
µs
µs
µs
ns
kΩ
V
V
nA
nA
mV
V
V
V
nA
nA
Test Conditions/Comments
V
CC
that guarantees valid output
V
CC
= 5.5 V, T
A
= −40°C to +85°C
V
CC
= 5.5 V, T
A
= −40°C to +125°C
T
A
= 25°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
RESET THRESHOLD TEMPERATURE COEFFICIENT
RESET THRESHOLD HYSTERESIS (V
HYST
)
RESET TIMEOUT PERIOD (t
RP
)
ADM630xD1
ADM630xD2
ADM630xD3
ADM630xD4
RESET OUTPUT VOLTAGE (V
OL
)
5
5
V
TH
V
TH
V
TH
25
2 × V
TH
1.4
28
200
1570
1.0
20
140
1120
2.0
40
280
2240
0.4
0.3
0.3
0.3
0.3
0.8
0.3 × V
CC
V
CC
> 4.25 V, I
SINK
= 3.2 mA
V
CC
> 2.5 V, I
SINK
= 1.2 mA
V
CC
> 1.2 V, I
SINK
= 500 μA
V
CC
> 1 V, I
SINK
= 50 μA
V
CC
> 0.9 V, I
SINK
= 25 μA
V
TH
> 4.0 V
V
TH
< 4.0 V
V
TH
> 4.0 V
V
TH
< 4.0 V
T
A
= 0°C to +70°C
T
A
= −40°C to +125°C
MR INPUT (ADM6306)
V
IL
V
IH
MR Minimum Input Pulse Width
MR Glitch Rejection
MR To Reset Delay
MR Pull-Up Resistance
1.23 V ADJUSTABLE RESET COMPARATOR INPUT
RST INx Input Threshold, V
RSTH
2.4
0.7 × V
CC
1
1.5
0.1
500
63.5
1.23
1.23
32
1.22
1.211
1.20
−25
−25
100
1.24
1.249
1.26
+25
+25
RST INx Input Current, I
RST INx
RST INx Hysteresis
0.4 V ADJUSTABLE RESET COMPARTOR INPUT
RST INx Input Threshold, V
RSTH
T
A
= 25°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
0 V < V
RST IN
< V
CC
– 0.3 V
3
, T
A
= −40°C to +85°C
V
RST IN
=
V
RSTH
2.5
0.396
0.394
0.39
−25
−25
0.40
0.40
0.40
0.404
0.406
0.41
+25
+25
RST INx Input Current, I
RST INx
T
A
= 25°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
0 V < V
RST INx
< V
CC
– 0.3 V
3
, T
A
= −40°C to +85°C
V
RST IN
= V
RSTH
1
2
The ADM6305 switches from undervoltage reset to normal operation when 1.5 V > V
CC
< 2.5 V.
The AMD6306 monitors V
CC
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.
Rev. A | Page 3 of 12
ADM6305/ADM6306
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
V
CC
All Pins (Except V
CC
)
Input/Output Current
Rate of Rise, V
CC
Storage Temperature Range
Operating Temperature Range
Lead Temperature (10 sec)
Junction Temperature
Rating
−0.3 V to +6 V
−0.3 V to (V
CC
+ 0.3 V)
20 mA
100 V/µs
−65°C to +160°C
−40°C to +125°C
300°C
150°C
Data Sheet
THERMAL RESISTANCE
Table 3.
Package Type
5-Lead SOT-23
θ
JA
240
Unit
°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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