Data Sheet
FEATURES
Open-Drain Microprocessor
Supervisory Circuit in 4-Lead SOT-143
ADM6315
FUNCTIONAL BLOCK DIAGRAM
GND
V
REF
V
CC
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 V
CC
> 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
Qualified for automotive applications
ADM6315
RESET
RESET
CIRCUITRY
DEBOUNCE
MR
00081-001
Figure 1.
APPLICATIONS
Microprocessor systems
Controllers
Intelligent instruments
Automotive systems
Safety systems
Portable instruments
V
CC
10kΩ
SYSTEM POWER
ADM6315
MR
GND
RESET
MICROPROCESSOR
SYSTEM
RESET
GND
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- and space-efficient
SOT-143 package.
Rev. G
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00081-011
ADM6315
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
Data Sheet
Typical Performance Characteristics ..............................................6
Theory of Operation .........................................................................7
Interfacing to Output of Other Devices .....................................7
Benefits of a Very Accurate RESET Threshold .............................7
Detailed Description .....................................................................7
Manual Reset Input .......................................................................7
Transient Immunity ......................................................................7
Outline Dimensions ..........................................................................8
Ordering Guide .............................................................................8
Automotive Products ....................................................................9
REVISION HISTORY
9/13—Rev. F to Rev. G
Changed Date in Revision F Revision History ............................. 2
Updated Outline Dimensions ......................................................... 8
12/11—Rev. E to Rev. F
Added Automotive Part ..................................................... Universal
Changes to Ordering Guide ............................................................ 8
9/07—Rev. D to Rev. E
Changes to Absolute Maximum Ratings ....................................... 4
Updated Outline Dimensions ......................................................... 8
Changes to Ordering Guide ............................................................ 8
4/06—Rev. C to Rev. D
Updated Format .................................................................. Universal
Updated Outline Dimensions ......................................................... 8
Changes to Ordering Guide ............................................................ 8
12/03—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
2/03—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
10/01—Rev. 0 to Rev. A
Edits to Table III ................................................................................7
Edits to Table IV ................................................................................7
1999—Revision 0: Initial Version
Rev. G | Page 2 of 12
Data Sheet
SPECIFICATIONS
V
CC
= full operating range, T
A
= T
MIN
to T
MAX
, V
CC
typical = 5 V, unless otherwise noted.
Table 1.
Parameter
SUPPLY
Operating Voltage
V
CC
Supply Current
Min
1
5
4
RESET VOLTAGE THRESHOLD (V
TH
)
V
TH
− 1.8%
V
TH
− 2.5%
V
TH
− 3.5%
V
TH
Typ
Max
5.5
12
15
10
12
V
TH
+ 1.8%
V
TH
+ 2.5%
V
TH
+ 3.5%
Unit
V
μA
μA
μA
μA
V
V
V
ppm/°C
μs
2
2.4
40
48
280
336
2240
2688
ms
ms
ms
ms
ms
ms
ms
ms
V
V
V
V
μs
ns
ns
kΩ
V
V
V
μA
ADM6315
Test Conditions/Comments
T
A
= −40°C to +85°C
V
CC
= 5.5 V, no load, T
A
= −40°C to +85°C
V
CC
= 5.5 V, no load, T
A
= −40°C to +125°C
V
CC
= 3.6 V, no load, T
A
= −40°C to +85°C
V
CC
= 3.6 V, no load, 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
V
CC
= falling at 1 mV/μs
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
T
A
= −40°C to +85°C
T
A
= −40°C to +125°C
V
TH
> 4 V (V
IL
)
V
TH
> 4 V (V
IH
)
V
TH
< 4 V (V
IL
)
V
TH
< 4 V (V
IH
)
RESET THRESHOLD TEMPERATURE COEFFICIENT
V
CC
TO RESET DELAY
RESET ACTIVE TIMEOUT PERIOD
ADM6315xxD1
ADM6315xxD2
ADM6315xxD3
ADM6315xxD4
MANUAL RESET
Input Threshold
60
35
1
0.8
20
16
140
112
1120
896
0.8
2.4
0.3 × V
CC
0.7 × V
CC
1.4
28
200
1570
Minimum Input Pulse
Glitch Rejection
To Reset Delay
Pull-Up Resistance
RESET OUTPUT
Output Voltage
1
100
500
63
32
100
0.4
0.3
0.3
1
Output Leakage Current
V
CC
> 4.25 V, I
SINK
= 3.2 mA
V
CC
> 2.5 V, I
SINK
= 1.2 mA
V
CC
> 1 V, I
SINK
= 80 μA
V
CC
> V
TH
, RESET deasserted
Rev. G | Page 3 of 12
ADM6315
ABSOLUTE MAXIMUM RATINGS
T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
Terminal Voltage (with Respect to Ground)
V
CC
All Other Inputs
Input Current
V
CC
Output Current
RESET
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
Vapor Phase (60 sec)
Infrared (15 sec)
ESD Rating
Rating
−0.3 V to +6 V
−0.3 V to +6 V
20 mA
20 mA
−40°C to +125°C
−65°C to +160°C
300°C
215°C
220°C
2.5 kV
Data Sheet
THERMAL RESISTANCE
θ
JA
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
4-Lead SOT-143
θ
JA
330
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; 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. G | Page 4 of 12
Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
GND 1
ADM6315
ADM6315
TOP VIEW
(Not to Scale)
4 V
CC
RESET
2
MR
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
1
2
Mnemonic
GND
RESET
Description
Ground Reference for All Signals, 0 V.
Active Low Logic Output. RESET remains low while V
CC
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 V
CC
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.
3
4
MR
V
CC
Rev. G | Page 5 of 12
00081-002
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