FEATURES
FUNCTIONAL BLOCK DIAGRAM
VCC
GND
VREF
ADM6315
RESET
RESET
CIRCUITRY
MR
DEBOUNCE
00081-001
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
Figure 1.
APPLICATIONS
Microprocessor systems
Controllers
Intelligent instruments
Automotive systems
Safety systems
Portable instruments
VCC
SYSTEM POWER
ADM6315
RESET
MR
10kΩ
MICROPROCESSOR
SYSTEM
RESET
GND
GND
00081-011
Data Sheet
Open-Drain Microprocessor
Supervisory Circuit in 4-Lead SOT-143
ADM6315
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.
Rev. H
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.
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Tel: 781.329.4700 ©1999–2018 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
ADM6315
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Typical Performance Characteristics ..............................................6
Applications ....................................................................................... 1
Theory of Operation .........................................................................7
Functional Block Diagram .............................................................. 1
Interfacing to Output of Other Devices .....................................7
General Description ......................................................................... 1
Benefits of an Accurate RESET Threshold ....................................7
Revision History ............................................................................... 2
Detailed Description .....................................................................7
Specifications..................................................................................... 3
Manual Reset Input .......................................................................7
Absolute Maximum Ratings............................................................ 4
Transient Immunity ......................................................................7
Thermal Resistance ...................................................................... 4
Outline Dimensions ..........................................................................8
ESD Caution .................................................................................. 4
Ordering Guide .............................................................................8
Pin Configuration and Function Descriptions ............................. 5
REVISION HISTORY
9/2013—Rev. F to Rev. G
Changed Date in Revision F Revision History ............................. 2
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
12/2011—Rev. E to Rev. F
Added Automotive Part ..................................................... Universal
Changes to Ordering Guide ............................................................ 8
10/2001—Rev. 0 to Rev. A
Edits to Table III ................................................................................7
Edits to Table IV ................................................................................7
9/2007—Rev. D to Rev. E
Changes to Absolute Maximum Ratings ....................................... 4
Updated Outline Dimensions ......................................................... 8
Changes to Ordering Guide ............................................................ 8
1999—Revision 0: Initial Version
11/2018—Rev. G to Rev. H
Change to Features Section ............................................................. 1
Deleted Automotive Products Section ........................................... 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
Rev. H | Page 2 of 8
Data Sheet
ADM6315
SPECIFICATIONS
VCC = full operating range, TA = TMIN to TMAX, VCC typical = 5 V, unless otherwise noted.
Table 1.
Parameter
SUPPLY
Operating Voltage
VCC Supply Current
Min
Typ
1
Max
Unit
Test Conditions/Comments
5.5
12
15
10
12
VTH + 1.8%
VTH + 2.5%
VTH + 3.5%
TA = −40°C to +85°C
VCC = 5.5 V, no load, TA = −40°C to +85°C
VCC = 5.5 V, no load, TA = −40°C to +125°C
VCC = 3.6 V, no load, TA = −40°C to +85°C
VCC = 3.6 V, no load, TA = −40°C to +125°C
TA = 25°C
TA = −40°C to +85°C
TA = −40°C to +125°C
RESET THRESHOLD TEMPERATURE COEFFICIENT
60
V
μA
μA
μA
μA
V
V
V
ppm/°C
VCC TO RESET DELAY
RESET ACTIVE TIMEOUT PERIOD
ADM6315xxD1
35
μs
VCC = falling at 1 mV/μs
ms
ms
ms
ms
ms
ms
ms
ms
TA = −40°C to +85°C
TA = −40°C to +125°C
TA = −40°C to +85°C
TA = −40°C to +125°C
TA = −40°C to +85°C
TA = −40°C to +125°C
TA = −40°C to +85°C
TA = −40°C to +125°C
VTH > 4 V (VIL)
VTH > 4 V (VIH)
VTH < 4 V (VIL)
VTH < 4 V (VIH)
100
V
V
V
V
μs
ns
ns
kΩ
0.4
0.3
0.3
1
V
V
V
μA
VCC > 4.25 V, ISINK = 3.2 mA
VCC > 2.5 V, ISINK = 1.2 mA
VCC > 1 V, ISINK = 80 μA
VCC > VTH, RESET deasserted
5
4
RESET VOLTAGE THRESHOLD (VTH)
ADM6315xxD2
ADM6315xxD3
ADM6315xxD4
MANUAL RESET
Input Threshold
VTH − 1.8%
VTH − 2.5%
VTH − 3.5%
1
0.8
20
16
140
112
1120
896
VTH
1.4
28
200
1570
2
2.4
40
48
280
336
2240
2688
0.8
2.4
0.3 × VCC
0.7 × VCC
Minimum Input Pulse
Glitch Rejection
To Reset Delay
Pull-Up Resistance
RESET OUTPUT
Output Voltage
Output Leakage Current
1
32
100
500
63
Rev. H | Page 3 of 8
ADM6315
Data Sheet
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
THERMAL RESISTANCE
Table 2.
Rating
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
−0.3 V to +6 V
−0.3 V to +6 V
Package Type
4-Lead SOT-143
Parameter
Terminal Voltage (with Respect to Ground)
VCC
All Other Inputs
Input Current
VCC
Output Current
RESET
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
ESD Rating
Table 3. Thermal Resistance
20 mA
20 mA
−40°C to +125°C
−65°C to +160°C
300°C
215°C
220°C
2.5 kV
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. H | Page 4 of 8
θJA
330
Unit
°C/W
Data Sheet
ADM6315
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
RESET 2
ADM6315
TOP VIEW
(Not to Scale)
4 VCC
3
MR
00081-002
GND 1
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
1
2
Mnemonic
GND
RESET
3
MR
4
VCC
Description
Ground Reference for All Signals, 0 V.
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.
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.
Monitored Supply Voltage.
Rev. H | Page 5 of 8
ADM6315
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
50
8
6
VCC = 3V
4
2
–20
0
20
40
60
80
100
125
TEMPERATURE (°C)
Figure 4. Supply Current vs. Temperature
25
20
15
10
5
0
0
300
200
300
400
500
600
700
900
800
1000
RESET COMPARATOR OVERDRIVE, (VTH – VCC) (mV)
1.000
250
200
VOD = 20mV
150
VOD = 125mV
50
VOD = 200mV
–20
0
20
40
60
80
100
125
TEMPERATURE (°C)
Figure 5. Power-Down Reset Delay vs. Temperature
0.990
–40
–20
0
20
40
60
80
100
125
TEMPERATURE (°C)
00081-007
0.995
100
Figure 8. Normalized Reset Threshold vs. Temperature (VCC Falling)
12
1.04
10
SUPPLY CURRENT (µA)
1.06
1.02
1.00
0.98
8
+85°C
6
–40°C
+25°C
4
2
–20
0
20
40
60
TEMPERATURE (°C)
80
100
125
00081-005
0.96
0.94
–40
100
NORMALIZED RESET THRESHOLD (V)
350
00081-004
POWER-DOWN RESET DELAY (µs)
30
1.005
400
NORMALIZED RESET TIMEOUT PERIOD (ms)
35
Figure 7. Maximum Transient Duration vs. RESET Comparator Overdrive
450
0
–40
40
Figure 6. Normalized Reset Timeout Period vs. Temperature (VCC Rising)
Rev. H | Page 6 of 8
0
0
1
2
3
4
SUPPLY VOLTAGE (V)
Figure 9. Supply Current vs. Supply Voltage
5
00081-008
0
–40
VCC = 1V
00081-003
IDD (µA)
VCC = 5.5V
45
00081-012
MAXIMUM TRANSIENT DURATION (µs)
10
Data Sheet
ADM6315
THEORY OF OPERATION
INTERFACING TO OUTPUT OF OTHER DEVICES
MANUAL RESET INPUT
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.
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.
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.
The MR input (typically) ignores negative-going pulses that are
faster than 100 ns, and it is guaranteed to accept any negativegoing 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.
VCC
VCC TRIP POINT (MIN)
VCC TRIP POINT (MIN)
VCC TO RESET
DELAY
VCC
VOL
RESET ACTIVE TIMEOUT
00081-009
RESET
VCC TRIP POINT (MAX)
VCC TRIP POINT
RESET
Figure 10. VCC Power-Down/Brownout Timing Diagram
00081-010
VCC TRIP POINT (MAX)
VCC TRIP POINT
Figure 11. VCC Power-Up 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.
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.
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 microprocessorbased system.
Rev. H | Page 7 of 8
ADM6315
Data Sheet
OUTLINE DIMENSIONS
3.04
2.90
2.80
1.92 BSC
0.20
BSC
4
1.40
1.30
1.20
3
1
2.64
2.10
2
1.72 REF
1.07
0.90
0.75
0.100
0.013
0.89
0.76
0.50
0.30
0.20
0.08
SEATING
PLANE
8°
0°
0.54 REF
0.60
0.50
0.40
03-13-2012-B
1.22
0.80
COMPLIANT TO JEDEC STANDARDS TO-253-AA
Figure 12. 4-Lead Small Outline Transistor Package [SOT-143]
(RA-4)
Dimensions shown in millimeters
ORDERING GUIDE
Model1
ADM6315-44D1ARTRL7
ADM6315-31D1ARTZR7
ADM6315-29D1ARTZR7
ADM6315-26D1ARTZR7
ADM6315-45D2ARTZR7
ADM6315-31D2ARTZR7
ADM6315-29D2ARTZR7
ADM6315-26D2ARTZR7
ADM6315-46D3ARTZR7
ADM6315-44D3ARTZR7
ADM6315-31D3ARTZR7
ADM6315-29D3ARTRL7
ADM6315-26D3ARTZR7
ADM6315-46D4ARTZR7
ADM6315-44D4ARTZR7
ADM6315-31D4ARTZR7
ADM6315-29D4ARTZR7
ADM6315-26D4ARTZR7
1
Temperature Range
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
–40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Package Description
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
4-Lead SOT-143
Package Option
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
RA-4
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)
Rev. H | Page 8 of 8
Trip Point
4.39
3.08
2.93
2.63
4.50
3.08
2.93
2.63
4.63
4.39
3.08
2.93
2.63
4.63
4.39
3.08
2.93
2.63
Minimum
Timeout (ms)
1
1
1
1
20
20
20
20
140
140
140
140
140
1120
1120
1120
1120
1120
Marking Code
MDT
M7X
M7T
MDB#
MA8
M7Y
M7U
MEB#
M84
MFT#
M4G
MFC
MFB#
M85
M9H
M7Z
M7W
MGB#
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