ANALOG DEVICES ADM6384 Service Manual
Microprocessor Supervisory
T
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FEATURES
Precision power supply monitoring
31 reset threshold options: 1.58 V to 5.0 V
Four reset timeouts: 1 ms, 20 ms, 140 ms, and 1120 ms
Manual reset input
Reset output stage
Push-pull active-low
Guaranteed reset output valid to V
Power supply glitch immunity
Specified over the −40°C to +125°C temperature range
4-lead SC70 package
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Portable equipment
GENERAL DESCRIPTION
The ADM6384 is a supervisory circuit that monitors power supply
voltage levels in microprocessor-based systems. A power-on reset
signal is generated when the supply voltage rises to a preset
threshold level. The debounced manual reset input of the
ADM6384 can be used to initiate a reset by means of an external
push button or logic signal.
The part is available in a choice of 31 reset threshold options,
from 1.58 V to 5.0 V. The minimum reset timeout periods are
1 ms, 20 ms, 140 ms, and 1120 ms.
The ADM6384 is available in a 4-lead SC70 package and typically consumes only 7 μA, making it suitable for use in low
power, portable applications.
= 1 V
CC
Circuit in 4-Lead SC70
ADM6384
FUNCTIONAL BLOCK DIAGRAMS
ADM6384
V
CC
V
REF
MR
DEBOUNCE
V
CC
ADM6384
RESET RESETMR
GND GND
RESET
GENERATOR
Figure 1.
100kΩ
Figure 2.
V
CC
MICROPROCESSOR
RESE
GND
05305-001
05305-002
Rev. B
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 www.analog.com
Fax: 781.461.3113 ©2005–2008 Analog Devices, Inc. All rights reserved.
ADM6384
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TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagrams ............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
REVISION HISTORY
7/08—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
1/07—Rev. 0 to Rev. A
Updated Format .................................................................. Universal
Changes to Specifications Table ...................................................... 3
Updated Outline Dimensions ....................................................... 11
Changes to Ordering Guide .......................................................... 11
7/05—Revision 0: Initial Version
Typical Performance Characteristics ..............................................7
Circuit Description............................................................................9
Reset Output ..................................................................................9
Manual Reset Input .......................................................................9
Applications Information .............................................................. 10
Negative-Going VCC Transients ................................................ 10
Ensuring Reset Valid to VCC = 0 V ........................................... 10
Outline Dimensions ....................................................................... 11
Ordering Guide .......................................................................... 11
Rev. B | Page 2 of 12
ADM6384
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SPECIFICATIONS
VCC = full operating range, TA = −40°C to +125°C, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
SUPPLY
VCC Operating Voltage Range 1 5.5 V
Supply Current 7 13 μA VCC = 5.5 V, no load
6 11 μA VCC = 3.6 V, no load
4 7 μA VCC = 2.5 V, no load1
3 6 μA VCC = 1.8 V, no load1
RESET THRESHOLD VOLTAGE
ADM6384x50x
ADM6384x49x 4.78 4.90 5.02 V
ADM6384x48x
ADM6384x47x 4.58 4.70 4.82 V
ADM6384x46x
ADM6384x45x 4.39 4.5 4.61 V
ADM6384x44x
ADM6384x43x 4.19 4.30 4.41 V
ADM6384x42x 4.1 4.2 4.31 V
ADM6384x41x 4.0 4.1 4.2 V
ADM6384x40x 3.9 4.0 4.1 V
ADM6384x39x 3.8 3.9 4.0 V
ADM6384x38x 3.71 3.8 3.9 V
ADM6384x37x 3.61 3.7 3.79 V
ADM6384x36x 3.51 3.6 3.69 V
ADM6384x35x 3.41 3.5 3.59 V
ADM6384x34x 3.32 3.4 3.49 V
ADM6384x33x 3.22 3.3 3.38 V
ADM6384x32x 3.12 3.2 3.28 V
ADM6384x31x
ADM6384x30x 2.93 3.0 3.08 V
ADM6384x29x
ADM6384x28x 2.73 2.8 2.87 V
ADM6384x27x 2.63 2.70 2.77 V
ADM6384x26x
ADM6384x25x 2.44 2.5 2.56 V
ADM6384x24x 2.34 2.4 2.46 V
ADM6384x23x
ADM6384x22x
ADM6384x17x
ADM6384x16x
RESET THRESHOLD TEMPERATURE COEFFICIENT 60 ppm/°C
VCC to Reset Delay
RESET THRESHOLD HYSTERESIS 2 × VTH mV
RESET TIMEOUT PERIOD
ADM6384xxD1 1 2 ms
ADM6384xxD2 20 40 ms
ADM6384xxD3 140 280 ms
ADM6384xxD4 1120 2240 ms
4.88 5.00 5.12 V
4.68 4.80 4.92 V
4.51 4.63 4.74 V
4.27 4.38 4.48 V
3.00 3.08 3.15 V
2.85 2.93 3.00 V
2.56 2.63 2.69 V
2.26 2.31 2.37 V
2.13 2.19 2.24 V
1.62 1.67 1.71 V
1.54 1.58 1.61 V
35 μs
falling at 10 mV/μs from VTH +
V
CC
100 mV to V
− 100 mV
TH
Rev. B | Page 3 of 12
ADM6384
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Parameter Min Typ Max Unit Test Conditions/Comments
MANUAL RESET INPUT
MR Input Threshold
VIL 0.3 × VCC V VCC < 4 V
0.8 V VCC > 4 V
VIH 0.7 × VCC V VCC < 4 V
2.4 V VCC > 4 V
MR Input Pulse Width
MR Glitch Rejection
MR Pull-Up Resistance
MR to Reset Delay
RESET OUTPUT VOLTAGE
VOL 0.3 V VCC ≥ 1.0 V, I
0.3 V VCC ≥ 2.5 V, I
0.4 V VCC ≥ 4.5 V, I
VOH 0.8 × VCC V VCC ≥ 2.5 V, I
0.8 × VCC V VCC ≥ 4.5 V, I
1
TA = 25°C only.
1 μs
100 ns
32 63 100 kV
200 ns
= 80 μA
SINK
= 1.2 mA
SINK
= 3.2 mA
SINK
SOURCE
SOURCE
= 500 μA
= 800 μA
Rev. B | Page 4 of 12
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