Analog Devices ADM6315 Datasheet
Open-Drain Microprocessor
V
REF
DEBOUNCE
RESET
CIRCUITRY
ADM6315
V
CC
MR
GND
RESET
a
FEATURES
Superior Upgrade for MAX6315
Specified Over Temperature
Low Power Consumption (5 A Typ)
Precision Voltage Monitor of Voltages from 2.5 V to
5 V at 100 mV Increments
Reset Assertion Down to V
Built-In Manual Reset
Pin Compatible with the ADM811
APPLICATIONS
Microprocessor Systems
Controllers
Intelligent Instruments
Automotive Systems
Safety Systems
Portable Instruments
GENERAL DESCRIPTION
CC
> 1 V
Supervisory Circuit in 4-Lead SOT-143
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. Voltages that can be monitored by the ADM6315 are 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), by a low input from another digital device or by 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 only be detected by the user.
Allowing the user to manually reset a system can reduce the
damage or danger that could be otherwise caused by an out of
control or locked-up system.
The ADM6315 comes in a cost and space efficient SOT-143
package.
ADM6315
FUNCTIONAL BLOCK DIAGRAM
V
CC
10kV
MR
ADM6315
RESET
GND
Figure 1. Typical Operating Circuit
SYSTEM POWER
mP
SYSTEM
RESET
GND
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 1999
ADM6315–SPECIFICATIONS
P
arameter Min Typ Max Units Test Conditions/Comments
(VCC = Full Operating Range, TA = T
MIN
to T
, VCC Typ = 5 V unless otherwise noted)
MAX
SUPPLY
Operating Voltage 1.0 5.5 V T
Supply Current 5 12 µAV
V
CC
412 µAV
1
RESET VOLTAGE THRESHOLD (V
TH
)
V
– 1.8% V
TH
V
– 2.5% V
TH
TH
V
+ 1.8% V T
TH
+ 2.5% V T
TH
= 0°C to +70°C
A
= 5.5 V (No Load)
CC
= 3.6 V (No Load)
CC
= +25°C
A
= 0°C to +70°C
A
RESET THRESHOLD TEMPERATURE
COEFFICIENT 60 ppm/°C
V
TO RESET DELAY 35 µsV
CC
= Falling at 1 mV/µs
CC
RESET ACTIVE TIMEOUT PERIOD 1 1.4 2.6 ms ADM6315xxD1
20 28 53 ms ADM6315xxD2
140 200 370 ms ADM6315xxD3
1120 1570 2960 ms ADM6315xxD4
MANUAL RESET
Input Threshold 0.8 V VTH > 4.0 V (VIL)
0.3 V
CC
2.4 V V
VV
0.7 V
CC
VV
> 4.0 V (VIH)
TH
< 4.0 V (VIL)
TH
< 4.0 V (VIH)
TH
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, I
0.3 V V
0.3 V V
Output Leakage Current 1 µAV
NOTES
1
The ADM6315 is available with preset reset threshold values from 2.5 V to 5 V at 100 mV increments.
Specifications subject to change without notice.
> 2.5 V, I
CC
> 1 V, I
CC
> VTH, RESET Deasserted
CC
SINK
SINK
= 80 mA
SINK
= 3.2 mA
= 1.2 mA
–2–
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ADM6315
ABSOLUTE MAXIMUM RATINGS*
(T
= +25°C unless otherwise noted)
A
Terminal Voltage (With Respect to Ground)
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
CC
All Other Inputs . . . . . . . . . . . . . . . . .–0.3 V to V
+ 0.3 V
CC
Input Current
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
CC
Output Current
RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Power Dissipation (T
= +70°C)
A
RT-4, SOT-143
Derate by 4 mW/°C above +70°C . . . . . . . . . . . 320 mW
Thermal Impedance . . . . . . . . . . . . . . . . . . . . 330°C/W
θ
JA
Operating Temperature Range . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +160°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . .+300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . .+215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . .+220°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5 kV
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum ratings
for extended periods of time may affect device reliability.
PIN CONFIGURATION
1
GND
ADM6315
TOP VIEW
(Not to Scale)
23
RESET
4
V
CC
MR
PIN FUNCTION DESCRIPTIONS
Pin Mnemonic Function
1 GND 0 V. Ground reference for all signals.
2 RESET Active Low Logic Output. RESET re-
mains low while V
is below the reset
CC
threshold or when MR is low, RESET
then remains low for either 1 ms (min),
20 ms (min), 140 ms (min) or 1120 ms
(min) after V
rises above the reset
CC
threshold and MR is high.
3 MR Manual Reset. This active low de-
bounced input will ignore input pulses of
100 ns (typical) and is guaranteed to
accept input pulses of greater than 1 µs.
Leave floating when not used.
4V
CC
Monitored supply voltage.
ORDERING GUIDE
Temperature Package Package
Model Range Description Option
ADM6315–xxxxxxx-xx* –40°C to +85°C Plastic Surface Mount SOT-143
*Refer to Tables I to IV.
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–3–
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