Data Sheet
FEATURES
Adjustable input threshold voltage options: 0.4 V and 1.23 V
Pretrimmed 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. After 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
ADM6305D3ARJZ-RL7
model is
1.23 V, while in the case of
ADM6305D3ARJZ1-RL7
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. Not all options are released for
sale as standard models. See the Ordering Guide for details.
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.
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.
Rev. C
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ADM6384
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagrams ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
Data Sheet
Typical Performance Characteristics ..............................................7
Circuit Description............................................................................9
Reset Output ..................................................................................9
Manual Reset Input .......................................................................9
Applications Information .............................................................. 10
Negative Going V
CC
Transients................................................. 10
Ensuring Reset Valid to V
CC
= 0 V ........................................... 10
Outline Dimensions ....................................................................... 11
Ordering Guide .......................................................................... 11
REVISION HISTORY
4/2018—Rev. D to Rev. E
Changes to General Description Section ...................................... 1
Added Note 2, Table 1; Renumbered Sequentially ....................... 3
Changes to Ordering Guide .......................................................... 11
6/2016—Rev. C to Rev. D
Change to Table 3 ............................................................................. 6
Updated Outline Dimensions ....................................................... 11
4/2011—Rev. B to Rev. C
Updated Outline Dimensions ....................................................... 11
Changes to Ordering Guide .......................................................... 11
7/2008—Rev. A to Rev. B
Changes to Figure 5, Figure 8, and Figure 9.................................. 7
Changes to Figure 10 ........................................................................ 8
Changes to Figure 15 ...................................................................... 11
Changes to Ordering Guide .......................................................... 11
1/2007—Rev. 0 to Rev. A
Updated Format .................................................................. Universal
Changes to Specifications Table ...................................................... 3
Updated Outline Dimensions ....................................................... 11
Changes to Ordering Guide .......................................................... 11
7/2005—Revision 0: Initial Version
Rev. E | 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, 3
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
)
3
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 COMPARATOR 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
4
, 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
4
, T
A
= −40°C to +85°C
V
RST IN
= V
RSTH
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
Not all options are released for sale as standard models. See the Ordering Guide for details.
4
Guaranteed by design.
1
2
Rev. C | 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 at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
Rev. C | Page 4 of 12
Data Sheet
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
RESET
1
5
ADM6305/ADM6306
ADM6305
GND
2
RST IN1
3
TOP VIEW
(Not to Scale)
4
V
CC
RST IN2
Figure 3.
ADM6305
Pin Configuration
Table 4.
ADM6305
Pin Function Descriptions
Pin No.
1
2
3
Mnemonic
RESET
GND
RST IN1
Description
Active Low, Open-Drain RESET Output.
Ground.
Adjustable Reset Comparator Input. This pin asserts RESET if the input voltage is below threshold. Its high input
impedance allows the use of an external resistor divider to program the monitoring threshold. Connect this pin to
the V
CC
pin if it is not used.
Adjustable Reset Comparator Input. This pin asserts RESET if the input voltage is below threshold. Its high input
impedance allows the use of an external resistor divider to program the monitoring threshold. Connect this pin to
V
CC
if it is not used.
Power Supply Input. V
CC
is not monitored on the
ADM6305.
RESET
1
5
4
RST IN2
5
V
CC
ADM6306
GND
2
MR
3
TOP VIEW
(Not to Scale)
4
V
CC
RST IN
Figure 4.
ADM6306
Pin Configuration
Table 5.
ADM6306
Pin Function Descriptions
Pin No.
1
2
3
4
Mnemonic
RESET
GND
MR
RST IN
Description
Active Low, Open-Drain RESET Output.
Ground.
Manual Reset Input.
Adjustable Reset Comparator Input. This pin asserts RESET if the input voltage is below threshold. Its high input
impedance allows the use of an external resistor divider to program the monitoring threshold. Connect this pin to
the V
CC
pin if it is not used.
Power Supply Input. V
CC
is monitored on the
ADM6306.
5
V
CC
Rev. C | Page 5 of 12
09345-004
09345-003
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