Microprocessor Supervisory
Circuit in 4-Lead SC70
ADM6711/ADM6713
Rev. A
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Trademarks and registered trademarks are the property of their respective owners.
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Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved.
FEATURES
Specified over temperature
Low power consumption (12 μA)
Precision monitoring of 2.5 V, 3 V, 3.3 V,
and 5 V power supply voltages
Reset timeout period of 140 ms (minimum)
Manual reset input
Output stages
Push-pull RESET output (ADM6711)
Open-drain RESET output (ADM6713)
Reset assertion down to 1 V VCC
Power supply glitch immunity
4-lead SC70 package
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Automotive systems
FUNCTIONAL BLOCK DIAGRAMS
ADM6711
V
CC
GND
RESET
RESET
GENERATOR
240ms
DEBOUNCE
MR
V
REF
0
3754-011
Figure 1.
03754-001
ADM6713
V
CC
GND
RESET
DEBOUNCE
MR
V
REF
RESET
GENERATOR
240ms
Figure 2.
GENERAL DESCRIPTION
The ADM6711/ADM6713 are reset generator circuits suitable
for use in microprocessor-based systems. They provide a reset
signal on power-up, power-down, and whenever the supply
voltage falls below a preset threshold. In addition, both parts
have a debounced manual reset input so that a reset signal can
also be initiated with an external switch or logic signal.
With six different reset threshold options available ranging
from 2.32 V to 4.63 V, the ADM6711/ADM6713 are suitable for
monitoring 2.5 V, 3 V, 3.3 V, and 5 V supplies. A reset timeout
of at least 140 ms occurs when VCC rises above the threshold.
This gives the supply voltage time to stabilize before the
microprocessor starts up.
The ADM6711 has a push-pull output, so no additional
external components are needed. The ADM6713 open-drain
output requires an external pull-up resistor that can be
connected to a voltage higher than VCC, if desired.
The parts are highly reliable with accurate voltage references
and immunity to fast, negative-going transients on VCC. Low
current consumption and space-efficient, 4-lead SC70
packaging make the ADM6711/ADM6713 ideal for use in low
power portable applications.
RESET RESETMR
GND GND
ADM6711/
ADM6713
*ADM6713 ONLY
V
CC
V
CC
MICROPROCESSOR
SYSTEM
*R
PULL-UP
03754-002
Figure 3. Typical Operating Circuit
ADM6711/ADM6713
Rev. A | Page 2 of 12
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagrams............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ..............................................7
Circuit Description............................................................................8
Manual Reset Input .......................................................................8
Power Supply Glitch Immunity ...................................................8
ADM6713 RESET Output Logic Levels .....................................8
Ensuring a Valid RESET Output Down To VCC = 0 V ............8
Outline Dimensions ..........................................................................9
Ordering Guide .............................................................................9
REVISION HISTORY
12/06—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to Specifications Table...................................................... 3
Changes to Figure 10........................................................................ 8
Changes to Ordering Guide ............................................................ 9
8/03—Revision 0: Initial Version
ADM6711/ADM6713
Rev. A | Page 3 of 12
SPECIFICATIONS
VCC = full operating range; TA = TMIN to TMAX; VCC typ = 5 V for L/M models, 3.3 V for T/S models, 3 V for R models, and 2.5 V for Z models,
unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
SUPPLY
VCC Operating Voltage Range 1.0 5.5 V TA = 0°C to 70°C
1.2 5.5 V TA = −40°C to +125°C
Supply Current 16 35 A VCC < 5.5 V, ADM671_L/M,
T
A = −40°C to +85°C
12 30 A VCC < 3.6 V, ADM671_R/S/T/Z,
T
A = −40°C to +85°C
60 A VCC < 5.5 V, ADM671_L/M,
T
A = 85°C to 125°C
60 A VCC < 3.6 V, ADM671_R/S/T/Z,
T
A = 85°C to 125°C
RESET VOLTAGE THRESHOLD
ADM671_L 4.56 4.63 4.70 V TA = 25°C
4.50 4.75 V TA = −40°C to +85°C
4.44 4.82 V TA = 85°C to 125°C
ADM671_M 4.31 4.38 4.45 V TA = 25°C
4.25 4.50 V TA = −40°C to +85°C
4.20 4.56 V TA = 85°C to 125°C
ADM671_T 3.04 3.08 3.11 V TA = 25°C
3.00 3.15 V TA = −40°C to +85°C
2.95 3.21 V TA = 85°C to 125°C
ADM671_S 2.89 2.93 2.96 V TA = 25°C
2.85 3.00 V TA = −40°C to +85°C
2.81 3.05 V TA = 85°C to 125°C
ADM671_R 2.59 2.63 2.66 V TA = 25°C
2.55 2.70 V TA = −40°C to +85°C
2.52 2.74 V TA = 85°C to 125°C
ADM671_Z 2.28 2.32 2.35 V TA = 25°C
2.25 2.38 V TA = −40°C to +85°C
2.22 2.42 V TA = 85°C to 125°C
RESET THRESHOLD TEMPERATURE
COEFFICIENT
30 ppm/°C
VCC to RESET DELAY 20 s VCC = VTH to (VTH − 100 mV)
RESET ACTIVE TIMEOUT PERIOD 140 240 460 ms TA = −40°C to +85°C
100 640 ms TA = 85°C to 125°C
RESET OUTPUT VOLTAGE
Low (ADM6711/ADM6713) 0.3 V VCC = VTH min, ISINK = 1.2 mA,
ADM671_R/S/T/Z
0.4 V VCC = VTH min, ISINK = 3.2 mA,
ADM671_L/M
0.3 V VCC >1.0 V, ISINK = 50 A
High (ADM6711) 0.8 VCC V VCC > VTH max, ISOURCE = 500 A,
ADM6711R/S/T/Z
0.8 VCC V VCC > VTH max, ISOURCE = 800 A,
ADM6711L/M
ADM6711/ADM6713
Rev. A | Page 4 of 12
Parameter Min Typ Max Unit Test Conditions/Comments
RESET OPEN-DRAIN OUTPUT
LEAKAGE CURRENT
1 µA
VCC > VTH, RESET deasserted
MANUAL RESET (MR)
Input Threshold 0.3 VCC V VIL
0.7 VCC V VIH
Pull-Up Resistance 10 20 kΩ
Minimum Pulse width 1 µs
Glitch Immunity 100 ns
Reset Delay 200 ns
ADM6711/ADM6713
Rev. A | Page 5 of 12
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 2.
Parameter Rating
VCC −0.3 V to +6 V
RESET (Push-Pull) −0.3 V to (VCC + 0.3 V)
RESET (Open-Drain) −0.3 V to +6 V
MR −0.3 V to (VCC + 0.3 V)
Input Current
VCC, MR 20 mA
Output Current
RESET 20 mA
Rate of Rise, VCC 100 V/µs
θJA Thermal Impedance, SC70 146°C/W
Operating Temperature Range −40°C to +125°C
Storage Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 10 sec) 300°C
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.
Table 3. RESET Threshold Options
Model RESET Threshold (V)
ADM671_L 4.63
ADM671_M 4.38
ADM671_T 3.08
ADM671_S 2.93
ADM671_R 2.63
ADM671_Z 2.32
ESD CAUTION
ADM6711/ADM6713
Rev. A | Page 6 of 12
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
GND
1
RESET
2
V
CC
4
MR
3
ADM6711/
ADM6713
TOP VIEW
(Not to Scale)
03754-003
Figure 4. 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 Input. RESET remains low while VCC is below the reset threshold and remains low for
240 ms (typical) after VCC rises above the reset threshold.
3 MR Manual Reset. This active low debounced input ignores input pulses of 100 ns (typical) and is guaranteed
to accept input pulses greater than 1 µs. Leave floating when not used.
4 VCC Supply Voltage Being Monitored.
ADM6711/ADM6713
Rev. A | Page 7 of 12
TYPICAL PERFORMANCE CHARACTERISTICS
IDD @ VCC = 1V
IDD @ VCC = 3V
IDD @ VCC = 5.5V
12
10
8
6
4
0
2
–40 –20 0 20 5030 70 85 100 120
03754-004
IDD (µA)
TEMPERATURE (°C)
Figure 5. Supply Current vs. Temperature
1000
900
800
700
600
500
400
300
200
100
0
03754-005
–40 –20 0 20 5030 70 85 100 120
POWER-DOWN RESET DELAY (µs)
TEMPERATURE (°C)
V
OD
= 200mV
V
OD
= 125mV
V
OD
= 20mV
Figure 6. Power-Down RESET Delay vs. Temperature: ADM671_R/S/T/Z
900
800
700
600
500
400
300
200
100
0
03754-006
–20 0 20 5030 70 85 100 120
POWER-DOWN RESET DELAY (µs)
TEMPERATURE (°C)
–40
V
OD
= 200mV
V
OD
= 125mV
V
OD
= 20mV
Figure 7. Power-Down RESET Delay vs. Temperature: ADM671_L/M
1.007
1.006
1.005
1.004
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
03754-008
–20 0 20 5030 70 85 100 120
NORMALIZED RESET THRESHOLD
TEMPERATURE (°C)
–40
Figure 8. RESET Threshold Deviation vs. Temperature
400
350
0
300
250
50
200
150
100
03754-009
10 100 1000
MAXIMUM TRANSIENT DURATION (µs)
RESET COMPARATOR OVERDRIVE, V
TH
– V
CC
(mV)
0
ADM671_L/M
ADM671_R/S/T/Z
Figure 9. Maximum Transient Duration (Without Causing a RESET Pulse) vs.
RESET Comparator Overdrive
ADM6711/ADM6713
Rev. A | Page 8 of 12
CIRCUIT DESCRIPTION
The ADM6711/ADM6713 are 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 ADM6711/ADM6713 are powered up, the RESET
output remains low for a period equal to the typical reset active
timeout period. This is designed to give the system time 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.
MANUAL RESET INPUT
The ADM6711/ADM6713 manual reset (MR) input allows the
system operator to reset a system by means of an external
manual switch. Alternatively, a logic signal from another digital
circuit can be used to trigger a reset via the MR input.
The MR input ignores negative-going pulses faster than 100 ns
(typical) and is guaranteed to accept any negative-going input
pulse of a duration greater than or equal to 1 μs. The RESET
output remains low while MR is held low and for 240 ms
(typical) after MR returns high.
If MR is connected to long cables or is used in a noisy environ-
ment, then placing a 0.1 μF capacitor between the MR input
and ground helps to remove any fast, negative-going transients.
POWER SUPPLY GLITCH IMMUNITY
The ADM6711/ADM6713 contain internal filtering circuitry
that provides immunity to fast transient glitches on the power
supply line. Figure 9 illustrates glitch immunity performance by
showing the maximum transient duration without causing a reset
pulse for glitches with amplitudes in the range of 1 mV to 1000 mV.
Glitch immunity makes the ADM6711/ADM6713 suitable for
use in noisy environments. Mounting a 0.1 μF decoupling
capacitor as close as possible to the VCC pin improves glitch
immunity further.
ADM6713 RESET OUTPUT LOGIC LEVELS
The ADM6713 open-drain RESET output is designed for use
with an external pull-up resistor. This resistor can be tied to VCC
or any other reasonable voltage level, offering the flexibility
to use the ADM6713 to drive a variety of different logic level
circuitry.
ENSURING A VALID RESET OUTPUT DOWN TO
VCC = 0 V
When VCC falls below 0.8 V, the ADM6711/ADM6713 RESET
output no longer sinks current, and a high impedance CMOS
logic input connected to RESET may drift to undetermined
logic levels. To eliminate this problem, a pull-down resistor is
connected from RESET to ground. A 100 kΩ resistor is large enough
not to load RESET and small enough to pull RESET to ground.
RESET
GND
ADM6711
100kΩ
03754-010
V
CC
VCC
ADM6711
V
CC
GND
RESET
RESET
GENERATOR
240ms
DEBOUNCE
MR
V
REF
0
3754-011
Figure 10. Ensuring a Valid RESET Output Down to VCC = 0 V
ADM6711/ADM6713
Rev. A | Page 9 of 12
OUTLINE DIMENSIONS
*PACKAGE OUTLINE CORRESPONDS IN FULL TO EIAJ SC82
EXCEPT FOR WIDTH OF PIN 2 AS SHOWN.
0.30
0.15
0.10 MAX
1.00
0.80
SEATING
PLANE 0.18
0.10
0.30
0.10
0.10 COPLANARITY
2
43
1
2.20
1.80
PIN 1
0.50 BSC
*0.70
0.50
1.35
1.15 2.40
1.80
1.10
0.80
0.65 BSC
0.40
0.10
12°
8°
Figure 11. 4-Lead Thin Shrink Small Outline Transistor Package [SC70]
(EIAJ SC82 body)
(KS-4)
Dimensions shown in millimeters
ORDERING GUIDE
Model
RESET
Threshold (V)
Temperature
Range
Package
Description
Package
Option
Ordering
Quantity (k) Branding
ADM6711LAKS-REEL 4.63 −40°C to +125°C 4-Lead SC70 KS-4 10 M0B
ADM6711LAKSZ-REEL1 4.63 −40°C to +125°C 4-Lead SC70 KS-4 10 M4U
ADM6711LAKS-REEL-7 4.63 −40°C to +125°C 4-Lead SC70 KS-4 3 M0B
ADM6711LAKSZ-REEL-71 4.63 −40°C to +125°C 4-Lead SC70 KS-4 3 M4U
ADM6711MAKS-REEL 4.38 −40°C to +125°C 4-Lead SC70 KS-4 10 M0C
ADM6711MAKS-REEL-7 4.38 −40°C to +125°C 4-Lead SC70 KS-4 3 M0C
ADM6711MAKSZ-REEL-71 4.38 −40°C to +125°C 4-Lead SC70 KS-4 3 M86
ADM6711TAKS-REEL 3.08 −40°C to +125°C 4-Lead SC70 KS-4 10 M0D
ADM6711TAKSZ-REEL1 3.08 −40°C to +125°C 4-Lead SC70 KS-4 10 M4A
ADM6711TAKS-REEL-7 3.08 −40°C to +125°C 4-Lead SC70 KS-4 3 M0D
ADM6711TAKSZ-REEL-71 3.08 −40°C to +125°C 4-Lead SC70 KS-4 3 M4A
ADM6711SAKS-REEL 2.93 −40°C to +125°C 4-Lead SC70 KS-4 10 M0E
ADM6711SAKSZ-REEL1 2.93 −40°C to +125°C 4-Lead SC70 KS-4 10 M4B
ADM6711SAKS-REEL-7 2.93 −40°C to +125°C 4-Lead SC70 KS-4 3 M0E
ADM6711SAKSZ-REEL-71 2.93 −40°C to +125°C 4-Lead SC70 KS-4 3 M4B
ADM6711RAKS-REEL 2.63 −40°C to +125°C 4-Lead SC70 KS-4 10 M0F
ADM6711RAKSZ-REEL1 2.63 −40°C to +125°C 4-Lead SC70 KS-4 10 M5F
ADM6711RAKS-REEL-7 2.63 −40°C to +125°C 4-Lead SC70 KS-4 3 M0F
ADM6711RAKSZ-REEL-71 2.63 −40°C to +125°C 4-Lead SC70 KS-4 3 M5F
ADM6711ZAKS-REEL 2.32 −40°C to +125°C 4-Lead SC70 KS-4 10 M0G
ADM6711ZAKSZ-REEL1 2.32 −40°C to +125°C 4-Lead SC70 KS-4 10 M4H
ADM6711ZAKS-REEL-7 2.32 −40°C to +125°C 4-Lead SC70 KS-4 3 M0G
ADM6711ZAKSZ-REEL-71 2.32 −40°C to +125°C 4-Lead SC70 KS-4 3 M4H
ADM6713LAKS-REEL 4.63 −40°C to +125°C 4-Lead SC70 KS-4 10 M0H
ADM6713LAKSZ-REEL1 4.63 −40°C to +125°C 4-Lead SC70 KS-4 10 M87
ADM6713LAKS-REEL-7 4.63 −40°C to +125°C 4-Lead SC70 KS-4 3 M0H
ADM6713LAKSZ-REEL-71 4.63 −40°C to +125°C 4-Lead SC70 KS-4 3 M87
ADM6713MAKS-REEL 4.38 −40°C to +125°C 4-Lead SC70 KS-4 10 M0J
ADM6713MAKS-REEL-7 4.38 −40°C to +125°C 4-Lead SC70 KS-4 3 M0J
ADM6713MAKSZ-REEL-71 4.38 −40°C to +125°C 4-Lead SC70 KS-4 3 M88
ADM6713TAKS-REEL 3.08 −40°C to +125°C 4-Lead SC70 KS-4 10 M0K
ADM6711/ADM6713
Rev. A | Page 10 of 12
Model
RESET
Threshold (V)
Temperature
Range
Package
Description
Package
Option
Ordering
Quantity (k) Branding
ADM6713TAKS-REEL-7 3.08 −40°C to +125°C 4-Lead SC70 KS-4 3 M0K
ADM6713TAKSZ-REEL-71 3.08 −40°C to +125°C 4-Lead SC70 KS-4 3 M89
ADM6713SAKS-REEL 2.93 −40°C to +125°C 4-Lead SC70 KS-4 10 M0L
ADM6713SAKSZ-REEL1 2.93 −40°C to +125°C 4-Lead SC70 KS-4 10 M57
ADM6713SAKS-REEL-7 2.93 −40°C to +125°C 4-Lead SC70 KS-4 3 M0L
ADM6713SAKSZ-REEL-71 2.93 −40°C to +125°C 4-Lead SC70 KS-4 3 M57
ADM6713RAKS-REEL 2.63 −40°C to +125°C 4-Lead SC70 KS-4 10 M0M
ADM6713RAKSZ-REEL1 2.63 −40°C to +125°C 4-Lead SC70 KS-4 10 M4S
ADM6713RAKS-REEL-7 2.63 −40°C to +125°C 4-Lead SC70 KS-4 3 M0M
ADM6713RAKSZ-REEL-71 2.63 −40°C to +125°C 4-Lead SC70 KS-4 3 M4S
ADM6713ZAKS-REEL 2.32 −40°C to +125°C 4-Lead SC70 KS-4 10 M0N
ADM6713ZAKSZ-REEL1 2.32 −40°C to +125°C 4-Lead SC70 KS-4 10 M4R
ADM6713ZAKS-REEL-7 2.32 −40°C to +125°C 4-Lead SC70 KS-4 3 M0N
ADM6713ZAKSZ-REEL-71 2.32 −40°C to +125°C 4-Lead SC70 KS-4 3 M4R
1 Z = Pb-free part.
ADM6711/ADM6713
Rev. A | Page 11 of 12
NOTES
ADM6711/ADM6713
Rev. A | Page 12 of 12
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
C03754-0-12/06(A)
NOTES
