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ANALOG
DEVICES
ADM6315
Include
RESE 1‘
Ducumemfeedbick
Open-Drain Microprocessor
Supervisory Circuit in 4-Lead SOT-143
Data Sheet
ADM6315
Rev. H Document Feedback
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 ©1999–2018 Analog Devices, Inc. All rights reserved.
Technical Support www.analog.com
FEATURES
Specified over temperature
Low power consumption (5 μA typical)
Precision voltage monitor of voltages from 2.5 V to 5 V
at 100 mV increments
Reset assertion down to VCC > 1 V
Reset timeout periods: 1 ms, 20 ms, 140 ms,
or 1120 ms (minimum)
Built-in manual reset
Pin compatible with the ADM811
Available in SOT-143 package
APPLICATIONS
Microprocessor systems
Controllers
Intelligent instruments
Automotive systems
Safety systems
Portable instruments
FUNCTIONAL BLOCK DIAGRAM
DEBOUNCE
ADM6315
MR
GND
RESET
V
CC
V
REF
RESET
CIRCUITRY
00081-001
Figure 1.
ADM6315
GND GND
10kΩ
SYSTEM POWER
V
CC
MICROPROCESSOR
SYSTEM
00081-011
RESET
RESET
MR
Figure 2. Typical Operating Circuit
GENERAL DESCRIPTION
The ADM6315 is a reliable voltage monitoring device that is
suitable for use in most voltage monitoring applications.
The ADM6315 is designed to monitor as little as a 1.8%
degradation of a power supply voltage. The ADM6315 can
monitor all voltages (at 100 mV increments) from 2.5 V to 5 V.
Included in this circuit is a debounced manual reset input.
RESET can be activated using an ordinary switch (pulling MR
low), a low input from another digital device, or a degradation
of the supply voltage.
The manual reset function is very useful, especially if the circuit
in which the ADM6315 is operating enters into a state that can
be detected only by the user. Allowing the user to reset a system
manually can reduce the damage or danger that could otherwise
be caused by an out of control or locked up system.
The ADM6315 is available in a cost efficient and space efficient
SOT-143 package.
snafu: of an Accunls RE
ADM6315 Data Sheet
Rev. H | Page 2 of 8
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
Thermal Resistance ...................................................................... 4
ESD Caution .................................................................................. 4
Pin Configuration and Function Descriptions ............................. 5
Typical Performance Characteristics ..............................................6
Theory of Operation .........................................................................7
Interfacing to Output of Other Devices .....................................7
Benefits of an Accurate RESET Threshold ....................................7
Detailed Description .....................................................................7
Manual Reset Input .......................................................................7
Transient Immunity ......................................................................7
Outline Dimensions ..........................................................................8
Ordering Guide .............................................................................8
REVISION HISTORY
11/2018—Rev. G to Rev. H
Change to Features Section ............................................................. 1
Deleted Automotive Products Section ........................................... 8
Changes to Ordering Guide ............................................................ 8
9/2013—Rev. F to Rev. G
Changed Date in Revision F Revision History ............................. 2
Updated Outline Dimensions ......................................................... 8
12/2011—Rev. E to Rev. F
Added Automotive Part ..................................................... Universal
Changes to Ordering Guide ............................................................ 8
9/2007—Rev. D to Rev. E
Changes to Absolute Maximum Ratings ....................................... 4
Updated Outline Dimensions ......................................................... 8
Changes to Ordering Guide ............................................................ 8
4/2006—Rev. C to Rev. D
Updated Format .................................................................. Universal
Updated Outline Dimensions ......................................................... 8
Changes to Ordering Guide ............................................................ 8
12/2003—Rev. B to Rev. C
Edit to Absolute Maximum Ratings ............................................... 3
Edits to Ordering Guide .................................................................. 4
Deleted Table I and Table II ............................................................ 6
Deleted Table III and Table IV ........................................................ 7
Updated Outline Dimensions ......................................................... 8
2/2003—Rev. A to Rev. B
Edits to Features ................................................................................. 1
Edits to Specifications ....................................................................... 2
Edits to Absolute Maximum Ratings .............................................. 3
Edits to Ordering Guide ................................................................... 3
Edits to Table I and Table II ............................................................. 6
Edits to Table III and Table IV ......................................................... 7
Updated Outline Dimensions .......................................................... 8
10/2001—Rev. 0 to Rev. A
Edits to Table III ................................................................................ 7
Edits to Table IV ................................................................................ 7
1999—Revision 0: Initial Version
RESET
RESET
RESET
RESET
RESET
Data Sheet ADM6315
Rev. H | Page 3 of 8
SPECIFICATIONS
VCC = full operating range, TA = TMIN to TMAX, VCC typical = 5 V, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
SUPPLY
Operating Voltage 1 5.5 V TA = −40°C to +85°C
VCC Supply Current 5 12 μA VCC = 5.5 V, no load, TA = −40°C to +85°C
15 μA VCC = 5.5 V, no load, TA = −40°C to +125°C
4 10 μA VCC = 3.6 V, no load, TA = −40°C to +85°C
12 μA VCC = 3.6 V, no load, TA = −40°C to +125°C
RESET VOLTAGE THRESHOLD (VTH) VTH − 1.8% VTH VTH + 1.8% V TA = 25°C
VTH − 2.5% VTH + 2.5% V TA = −40°C to +85°C
VTH − 3.5% VTH + 3.5% V TA = −40°C to +125°C
RESET THRESHOLD TEMPERATURE COEFFICIENT 60 ppm/°C
VCC TO RESET DELAY 35 μs VCC = falling at 1 mV/μs
RESET ACTIVE TIMEOUT PERIOD
ADM6315xxD1
1
1.4
2
ms
T
A
= −40°C to +85°C
0.8 2.4 ms TA = −40°C to +125°C
ADM6315xxD2 20 28 40 ms TA = −40°C to +85°C
16 48 ms TA = −40°C to +125°C
ADM6315xxD3 140 200 280 ms TA = −40°C to +85°C
112
336
ms
T
A
= −40°C to +125°C
ADM6315xxD4 1120 1570 2240 ms TA = −40°C to +85°C
896 2688 ms TA = −40°C to +125°C
MANUAL RESET
Input Threshold 0.8 V VTH > 4 V (VIL)
2.4 V VTH > 4 V (VIH)
0.3 × VCC V VTH < 4 V (VIL)
0.7 × VCC V VTH < 4 V (VIH)
Minimum Input Pulse 1 μs
Glitch Rejection
100
ns
To Reset Delay 500 ns
Pull-Up Resistance 32 63 100 kΩ
RESET OUTPUT
Output Voltage 0.4 V VCC > 4.25 V, ISINK = 3.2 mA
0.3 V VCC > 2.5 V, ISINK = 1.2 mA
0.3 V VCC > 1 V, ISINK = 80 μA
Output Leakage Current 1 μA VCC > VTH, RESET deasserted
RESET
Am
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ADM6315 Data Sheet
Rev. H | Page 4 of 8
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 2.
Parameter Rating
Terminal Voltage (with Respect to Ground)
VCC −0.3 V to +6 V
All Other Inputs −0.3 V to +6 V
Input Current
VCC 20 mA
Output Current
RESET 20 mA
Operating Temperature Range −40°C to +125°C
Storage Temperature Range −65°C to +160°C
Lead Temperature (Soldering, 10 sec) 300°C
Vapor Phase (60 sec) 215°C
Infrared (15 sec) 220°C
ESD Rating
2.5 kV
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.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type θJA Unit
4-Lead SOT-143 330 °C/W
ESD CAUTION
WE
LIL!
§\
Ihenfim
Data Sheet ADM6315
Rev. H | Page 5 of 8
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
GND
RESET
14
MR
V
CC
23
ADM6315
TOP VIEW
(Not to Scale)
00081-002
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1 GND Ground Reference for All Signals, 0 V.
2 RESET Active Low Logic Output. RESET remains low while VCC is below the reset threshold or when MR is low. RESET
then remains low for a minimum of 1 ms, 20 ms, 140 ms, or 1120 ms after VCC rises above the reset threshold
and MR is high.
3 MR Manual Reset. This active low debounced input ignores input pulses of 100 ns (typical) and is guaranteed to
accept input pulses of greater than 1 μs. Leave floating when not used.
4 VCC Monitored Supply Voltage.
/
7 Maximum TmmremDu/ar/on vs. RESET
was
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ADM6315 Data Sheet
Rev. H | Page 6 of 8
TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (°C)
10
4
0
–40
6
2
8
I
DD
(µA)
–20 020 40 60 80 100 125
V
CC
= 5.5V
V
CC
= 3V
V
CC
= 1V
00081-003
Figure 4. Supply Current vs. Temperature
0
POWER-DOWN RESET DELAY (µs)
50
100
150
200
250
300
350
400
450
V
OD
= 20mV
V
OD
= 125mV
V
OD
= 200mV
TEMPERATURE (°C)
–40
–20 020 40 60 80 100 125
00081-004
Figure 5. Power-Down Reset Delay vs. Temperature
0.94
NORMALIZED RESET TIMEOUT PERIOD (ms)
0.96
0.98
1.00
1.02
1.04
1.06
TEMPERATURE (°C)
–40
–20 020 40 60 80 100 125
00081-005
Figure 6. Normalized Reset Timeout Period vs. Temperature (VCC Rising)
50
45
40
35
30
25
20
15
10
5
0
0100 200 300 400 500 600 700 800 900 1000
MAXIMUM TRANSIENT DURATION (µs)
00081-012
RESET COMPARATOR OVERDRIVE, (V
TH
– V
CC
) (mV)
Figure 7. Maximum Transient Duration vs. RESET Comparator Overdrive
NORMALIZED RESET THRESHOLD (V)
0.995
1.000
1.005
0.990
TEMPERATURE (°C)
–40
–20 020 40 60 80 100 125
00081-007
Figure 8. Normalized Reset Threshold vs. Temperature (VCC Falling)
SUPPLY VOLTAGE (V)
0
SUPPLY CURRENT (µA)
2
12
4
6
8
10
+85°C
+25°C –40°C
012345
00081-008
Figure 9. Supply Current vs. Supply Voltage
RiESEY
RiESET
Data Sheet ADM6315
Rev. H | Page 7 of 8
THEORY OF OPERATION
INTERFACING TO OUTPUT OF OTHER DEVICES
The ADM6315 series is designed to integrate with as many
devices as possible. One feature of the ADM6315 is the RESET
open-drain output, which can sink current from sources with a
voltage greater than the VCC of the ADM6315 input, making it
suitable for use in more diverse applications.
BENEFITS OF AN ACCURATE RESET THRESHOLD
Because the ADM6315 series can operate effectively even when
there are large degradations of the supply voltages (due to an
accurate internal voltage reference circuit), the possibility of a
malfunction during a power failure is greatly reduced.
RESET
VOL
V
CC
TRIP POINT (MAX)
V
CC
TRIP POINT
V
CC
TO RESET
DELAY
V
CC
V
CC
TRIP POINT (MIN)
00081-009
Figure 10. VCC Power-Down/Brownout Timing Diagram
DETAILED DESCRIPTION
The ADM6315 is designed to protect the integrity of a system’s
operation by ensuring the proper operation of the system
during power-up, power-down, and brownout conditions.
When the ADM6315 is powered up, the RESET output of the
ADM6315 remains low for a period typically equal to the RESET
active timeout period. This feature allows adequate time for the
system to power up correctly and for the power supply to
stabilize before any devices are brought out of reset and allowed
to begin executing instructions. Initializing a system in this way
provides a more reliable startup for microprocessor systems.
When a brownout condition occurs (assuming VCC is falling at
1 mV/μs), the ADM6315 produces a reset in 35 μs typical.
Producing a reset this fast means that the entire system can be
reset together before any part of the system’s voltage falls below
its recommended operating voltage. This system reset can avoid
dangerous and/or erroneous operation of a microprocessor-
based system.
MANUAL RESET INPUT
The ADM6315 also provides an additional input, MR. This
input can be used either as a means for the system operator to
reset the system manually via a switch or for a digital circuit to
reset the system.
The MR input (typically) ignores negative-going pulses that are
faster than 100 ns, and it is guaranteed to accept any negative-
going input pulse of a duration greater than or equal to 1 μs. If
MR is connected to long cables or is used in a noisy environment,
placing a 1 μF decoupling capacitor between the MR input and
ground further improves the glitch immunity of the ADM6315.
V
CC
TRIP POINT (MAX)
V
CC
TRIP POINT
V
CC
V
CC
TRIP POINT (MIN)
RESET
RESET ACTIVE TIMEOUT
00081-010
Figure 11. VCC Power-Up Timing Diagram
TRANSIENT IMMUNITY
As well as being an accurate reset circuit, the ADM6315 has
good immunity from negative-going transients (see Figure 7).
Because of this characteristic, the ADM6315 is suitable for use
in noisy environments.
Figure 7 shows the RESET comparator overdrive (the maximum
magnitude of negative-going pulses with respect to the typical
reset threshold) vs. the pulse duration without a reset.
ANALOG
DEVICES
ADM6315 Data Sheet
Rev. H | Page 8 of 8
OUTLINE DIMENSIONS
COMPLIANT TO JEDEC STANDARDS TO-253-AA
0.89
0.76
0.50
0.30
0.100
0.013
3.04
2.90
2.80
1.07
0.90
0.75
1.92 BSC
1.72 REF
0.20
BSC
0.54 REF
12
3
4
1.40
1.30
1.20
2.64
2.10
8°
0°
0.60
0.50
0.40
0.20
0.08
1.22
0.80
03-13-2012-B
SEATING
PLANE
Figure 12. 4-Lead Small Outline Transistor Package [SOT-143]
(RA-4)
Dimensions shown in millimeters
ORDERING GUIDE
Model1 Temperature Range Package Description Package Option Trip Point
Minimum
Timeout (ms) Marking Code
ADM6315-44D1ARTRL7 −40°C to +125°C 4-Lead SOT-143 RA-4 4.39 1 MDT
ADM6315-31D1ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 3.08 1 M7X
ADM6315-29D1ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 2.93 1 M7T
ADM6315-26D1ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 2.63 1 MDB#
ADM6315-45D2ARTZR7 –40°C to +125°C 4-Lead SOT-143 RA-4 4.50 20 MA8
ADM6315-31D2ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 3.08 20 M7Y
ADM6315-29D2ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 2.93 20 M7U
ADM6315-26D2ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 2.63 20 MEB#
ADM6315-46D3ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 4.63 140 M84
ADM6315-44D3ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 4.39 140 MFT#
ADM6315-31D3ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 3.08 140 M4G
ADM6315-29D3ARTRL7 −40°C to +125°C 4-Lead SOT-143 RA-4 2.93 140 MFC
ADM6315-26D3ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 2.63 140 MFB#
ADM6315-46D4ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 4.63 1120 M85
ADM6315-44D4ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 4.39 1120 M9H
ADM6315-31D4ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 3.08 1120 M7Z
ADM6315-29D4ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 2.93 1120 M7W
ADM6315-26D4ARTZR7 −40°C to +125°C 4-Lead SOT-143 RA-4 2.63 1120 MGB#
1 Z = RoHS-Compliant Part, # denotes lead-free product may be top or bottom marked.
©1999–2018 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D00081-0-11/18(H)
