AD ADM6339EARJZ-RL7 Quad voltage microprocessor supervisory circuit Datasheet

Quad Voltage Microprocessor
Supervisory Circuit
ADM6339
FEATURES
FUNCTIONAL BLOCK DIAGRAM
IN1
5V PULLUP
IN2
IN1
IN2
RESET
200ms
TIMEOUT
IN3
IN4
ADM6339
VREF
08169-001
Accurate monitoring of up to four power supply voltages
6 factory-set threshold options: −5.0 V, +1.8 V, +2.5 V, +3.0 V,
+3.3 V, and +5.0 V
Adjustable input threshold options: −0.5 V (±2.0% accuracy),
+0.62 V (±0.8% accuracy), and +1.23 V
200 ms typical reset timeout
Open-drain RESET output (10 μA internal pull-up)
Reset output stage: active low, valid to IN1 = 1 V or IN2 = 1 V
Low power consumption (55 μA)
Glitch immunity
Specified from −40°C to +85°C
6-lead SOT-23 package
Figure 1.
APPLICATIONS
Telecommunications
Microprocessor systems
Data storage equipment
Servers/workstations
GENERAL DESCRIPTION
The ADM6339 is a high accuracy supervisory circuit capable of
monitoring up to four system supply voltages.
The ADM6339 incorporates a variety of internally pretrimmed
undervoltage threshold options for monitoring −5.0 V, +1.8 V,
+2.5 V, +3.0 V, +3.3 V, and +5.0 V supply voltages. Tolerance levels
of ±5% and ±10% are available. The device is also available
with one to three adjustable threshold options. The adjustable
voltage threshold options are +1.23 V, +0.62 V, and −0.5 V. See
the Ordering Guide section for a list and description of all
available options.
If a monitored power supply voltage decreases below the minimum voltage threshold (or rises above the maximum voltage
threshold for the −0.5 V and −5.0 V input options), a single
active low output asserts, triggering a system reset. The output
is open drain with a weak internal pull-up to the monitored IN2
supply of typically 10 μA. After all voltages exceed the selected
threshold level, the reset signal remains low for the reset
timeout period (200 ms typical).
The ADM6339 output remains valid as long as IN1 or IN2 exceeds
1 V. Unused monitored inputs should not be allowed to float or
to be grounded; instead, they should be connected to a supply
voltage greater than their specified threshold voltages.
The ADM6339 is available in a 6-lead SOT-23 package. The
device operates over the extended temperature range of −40°C
to +85°C.
Rev. A
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 ©2009–2010 Analog Devices, Inc. All rights reserved.
ADM6339
TABLE OF CONTENTS
Features .............................................................................................. 1
Typical Performance Characteristics ..............................................6
Applications ....................................................................................... 1
Theory of Operation .........................................................................8
Functional Block Diagram .............................................................. 1
Input Configuration ......................................................................8
General Description ......................................................................... 1
Monitoring Negative Voltages < −5.0 V .....................................8
Revision History ............................................................................... 2
User Adjustable Threshold Options ...........................................8
Specifications..................................................................................... 3
RESET Output Configuration .....................................................9
Absolute Maximum Ratings............................................................ 4
Outline Dimensions ....................................................................... 10
ESD Caution .................................................................................. 4
Ordering Guide .......................................................................... 10
Pin Configuration and Function Descriptions ............................. 5
REVISION HISTORY
10/10—Rev. 0 to Rev. A
Added Figure 19.............................................................................. 10
6/09—Revision 0: Initial Version
Rev. A | Page 2 of 12
ADM6339
SPECIFICATIONS
VIN2 = 1.0 V to 5.5 V, TA = −40°C to +85°C, unless otherwise noted. Typical values are VIN2 = 3.0 V to 3.3 V, TA = 25°C.
Table 1.
Parameter
OPERATING VOLTAGE RANGE (VIN2) 1 , 2
INPUT CURRENT
INx Input Current
Min
1.0
Typ
Max
5.5
Units
V
Test Conditions/Comments
25
55
40
115
μA
μA
μA
μA
μA
μA
μA
VINx = nominal input voltage for 1.8 V, 2.5 V, and 5.0 V supplies.
VIN2 = nominal input voltage for 3.0 V and 3.3 V supplies. VIN2 is
also the device power supply. The supply splits into 25 μA for
the resistor divider and 30 μA for other circuits.
VINx = 0 V to VIN2 (input threshold voltage = 1.23 V).
VIN1 = 1.5 V (ADM6339K and ADM6639L models only).
VINx = −5.0 V (INx input threshold voltage = −5.0 V).
VINx = 0.62 V (INx input threshold voltage = 0.62 V).
VINx = −0.5 V (INx input threshold voltage = −0.5 V).
5.0 V (−5% tolerance) threshold.
5.0 V (−10% tolerance) threshold.
3.3 V (−5% tolerance) threshold.
3.3 V (−10% tolerance) threshold.
3.0 V (−5% tolerance) threshold.
3.0 V (−10% tolerance) threshold.
2.5 V (−10% tolerance) threshold.
1.8 V (−10% tolerance) threshold.
−5.0 V (+5% tolerance) threshold.
−5.0 V (+10% tolerance) threshold.
−0.1
−0.1
−1
−3
+0.1
1.5
−20
+0.1
−5
4.50
4.25
3.00
2.85
2.70
2.55
2.13
1.53
−4.75
−4.50
4.63
4.38
3.08
2.93
2.78
2.63
2.19
1.58
−4.63
−4.38
4.75
4.50
3.15
3.00
2.85
2.70
2.25
1.62
−4.50
−4.25
V
V
V
V
V
V
V
V
V
V
1.20
0.615
−0.497
1.23
0.620
−0.487
0.3
0.47
60
1.26
0.625
−0.477
V
V
V
% VTH
% VTH
ppm/°C
0.4
−15
THRESHOLD VOLTAGE
Fixed Threshold Voltage (VTH)
VINx Decreasing
VINx Increasing
Adjustable Threshold Voltage (VTH)
VINx Decreasing
VINx Increasing
RESET THRESHOLD HYSTERESIS (VHYST)
RESET THRESHOLD TEMPERATURE
COEFFICIENT (TCVTH)
INX to RESET DELAY (tRD)
30
RESET TIMEOUT PERIOD (tRP)
RESET OUTPUT LOW (VOL)
140
RESET OUTPUT HIGH (VOH)
0.8 × VIN2
RESET OUTPUT HIGH SOURCE
CURRENT (IOH)
200
μs
280
0.4
0.4
0.4
0.4
0.4
10
1
The device is powered by Input IN2.
2
The RESET output is guaranteed to be in the correct state for IN1 or IN2 down to 1 V.
−0.5 V threshold.
IN4, ADM6339Q model.
VINx = VTH to (VTH − 50 mV) for all inputs except −0.5 V and −5.0 V;
VINx = VTH to (VTH + 50 mV) for −5.0 V and −0.5 V inputs only.
ms
V
V
V
V
V
V
VIN2 = 5.0 V, ISINK = 2 mA.
VIN2 = 2.5 V, ISINK = 1.2 mA.
VIN2 = VIN1 = 1 V, ISINK = 50 μA.
VIN1 =1V, VIN2 = 0 V, ISINK = 20 μA
VIN1 =0 V, VIN2 = 1 V, ISINK = 20 μA
VIN2 ≥ 2.55 V, ISOURCE = 6 μA, RESET not asserted.
μA
VIN2 ≥ 2.55 V, RESET not asserted.
Rev. A | Page 3 of 12
ADM6339
ABSOLUTE MAXIMUM RATINGS
Table 3. Thermal Resistance
Table 2.
Parameter
VCC, RESET, GND
Continuous RESET Current
INx (Positive Reset Threshold)
IN4 (Negative Reset Threshold, −5 V)
IN4 ADM6339Q Model (Negative Reset
Threshold, −0.5 V)
Storage Temperature Range
Operating Temperature Range
Lead Temperature (10 sec)
Junction Temperature
Rating
−0.3 V to +6 V
20 mA
−0.3 V to +6 V
−6 V to +0.3 V
−2 V to +0.3 V
Package Type
6-Lead SOT-23
ESD CAUTION
−65°C to +125°C
−40°C to +85°C
300°C
135°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.
Rev. A | Page 4 of 12
θJA
169.5
Unit
°C/W
ADM6339
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
IN1 1
6
RESET
IN2 2
IN3 3
5 GND
TOP VIEW
(Not to Scale)
4
IN4
08169-002
ADM6339
Figure 2. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
Mnemonic
IN1
IN2
IN3
IN4
GND
RESET
Description
Monitored Input Voltage 1.
Monitored Input Voltage 2. IN2 is the power supply input for the ADM6339.
Monitored Input Voltage 3.
Monitored Input Voltage 4.
Ground.
Active Low RESET Output. RESET goes low when an input drops below the specified threshold (or above in the
case of the −0.5 V and −5.0 V input options). After all inputs rise above the threshold voltage, RESET remains low
for 200 ms (typical) before going high. RESET is open drain with a weak internal pull-up to IN2, typically 10 μA.
Rev. A | Page 5 of 12
ADM6339
TYPICAL PERFORMANCE CHARACTERISTICS
VIN2 = VCC = 3.0 V, TA = 25°C, unless otherwise noted.
100
58
IN2 INPUT CURRENT (µA)
56
54
52
50
48
46
44
08169-010
VIN2 = 3.3V
42
VIN2 = 3V
40
–40
–15
10
35
90
80
70
60
50
40
30
RESET ASSERTED ABOVE THIS LINE
20
10
0
85
60
08169-012
MAXIMUM INX TRANSIENT DURATION (µs)
60
0
100
TEMPERATURE (ºC)
200
300
400
500
600
700
800
900
1000
RESET THRESHOLD OVERDRIVE (mV)
Figure 3. IN2 Input Current vs. Temperature
Figure 6. Maximum INx Transient Duration vs. Reset Threshold Overdrive
120
100
90
80
RESET DELAY (µs)
80
60
40
70
60
50
40
30
20
08169-011
20
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
10
0
5.5
5.0
08169-013
IN2 INPUT CURRENT (µA)
100
0
IN2 VOLTAGE (V)
200
300
400
500
600
700
800
900
1000
RESET THRESHOLD OVERDRIVE (mV)
Figure 7. RESET Delay vs. Reset Threshold Overdrive (INx Decreasing)
Figure 4. IN2 Input Current vs. IN2 Voltage
214
0.05
212
RESET TIMEOUT DELAY (mS)
0
5V
–0.05
1.8V
–0.10
–0.15
210
208
206
–0.20
–40
–20
0
20
40
60
TEMPERATURE (°C)
80
202
–40
08169-014
204
08169-007
NORMALIZED THRESHOLD ERROR (%)
100
–15
10
35
60
TEMPERATURE (ºC)
Figure 8. Reset Timeout Delay vs. Temperature
Figure 5. Normalized Threshold Error vs. Temperature
Rev. A | Page 6 of 12
85
ADM6339
INx
C3
INx
C3
RESET
RESET
BwL DC1M C3 BwL DC1M
2.00V/div
1.00V/div
–6.000V offset
2.040V offset
Timebase 0.0µs Trigger
0.0µs
10.0 µs/div STOP
–520mV
2.0 GS/s EDGE NEGATIVE
200kS
C2 BwL DC1M C3 BwL DC1M
2.00V/div
2.00V/div
–6.000V offset
2.000V offset
Figure 9. RESET Pull-Up and Pull-Down Response (10 μs/Div)
Figure 11. RESET Timeout Delay (50 ms/Div)
–0.490
–0.5V VIN TRIP THRESHOLD (V)
0.625
0.620
0.615
–20
0
20
40
60
80
TEMPERATURE (°C)
–0.495
–0.500
–0.505
–0.510
–40
08169-009
0.62V VIN TRIP THRESHOLD (V)
0.630
0.610
–40
Timebase –101ms Trigger C3 DC
50.0 ms/div Normal 680mV
Positive
1.0 MS/s Edge
500kS
–20
0
20
40
60
80
TEMPERATURE (°C)
Figure 10. 0.62 V Input Voltage Trip Threshold vs. Temperature
Figure 12. −0.5 V Input Voltage Trip Threshold vs. Temperature
Rev. A | Page 7 of 12
08169-008
C2
08169-015
C2
08169-016
C2
ADM6339
THEORY OF OPERATION
The device includes several factory-set voltage threshold options
for monitoring −5.0 V, +1.8 V, +2.5 V, +3.0 V, +3.3 V, and +5.0 V
supplies. The ADM6339 is available with one to three adjustable
threshold options. The adjustable voltage threshold options
available are +1.23 V, +0.62 V, and −0.5 V. See the Ordering Guide
section for a list and description of all available options.
INPUT CONFIGURATION
Built-in hysteresis improves the ADM6339’s immunity to short
input transients, without noticeably reducing the threshold
accuracy. The internal comparators each have a hysteresis of
0.3% with respect to the reset threshold voltage. (The IN4 input
of the ADM6339Q model has a hysteresis of 0.47% with respect
to its reset threshold voltage of −0.487 V.)
Monitored inputs are resistant to short power supply glitches.
Figure 6 depicts the ADM6339 glitch immunity data. To
increase noise immunity in noisy applications, place a 0.1 μF
capacitor between the IN2 input and ground. Adding capacitance
to IN1, IN3, and IN4 also improves noise immunity.
IN1
IN3 RESET
where:
R2 ≤ 2.49 kΩ.
VINTH is the desired threshold voltage.
VTH is the internal threshold voltage.
For example, when monitoring a nominal voltage of −12 V,
VINTH = −11.1 V, VTH = −4.63 V, and R2 = 2.49 kΩ. Therefore,
using the previous equation, R1 = 3.48 kΩ.
ADM6339
R2
R1
VINTH
Figure 14. Negative Voltage Monitoring
USER ADJUSTABLE THRESHOLD OPTIONS
When using an adjustable threshold of 1.23 V (typical), to
monitor a voltage greater than 1.23 V, connect a resistor divider
network to the device as shown in Figure 15. VINTH, the desired
threshold voltage, can be expressed as
MICROPROCESSOR
GND
08169-003
IN4
VINTH = 1.23 V((R1 + R2)/(R2))
Figure 13. Typical Applications Circuit
IN2 must always be used for normal operation because it is the
device’s power supply input. Do not allow unused monitor
inputs to float or to be grounded. Unused IN3 or IN4 inputs with
positive thresholds can be connected directly to the IN2 input.
Unused IN4 options with negative thresholds must be tied to a
more negative supply.
The ADM6339 has a guaranteed input current of ±0.1 μA on its
1.23 V adjustable input. Resistor values up to 100 kΩ can be
used for R2 with <1% error.
VINTH
R1
ADM6339
R2
MONITORING NEGATIVE VOLTAGES < −5.0 V
A number of ADM6339 models include a pretrimmed threshold
option to monitor −5.0 V voltage levels. Use a low impedance
resistor divider network similar to that shown in Figure 14 to
monitor supplies more negative than −5.0 V.
The current through the external resistor divider should be
greater than the input current for the −5.0 V monitor options.
VREF = 1.23V
08169-005
IN2
R1 = R2((VINTH/VTH) − 1)
The ADM6339 offers the choice of three adjustable INx input
threshold voltages: +1.23 V, +0.62 V, or −0.5 V.
ADM6339
MONITORED
SUPPLIES
For an input monitor current error of <1%, the resistor network
current should be greater than or equal to 2 mA (for IIN4 = 20 μA
maximum). Set R2 = 2.5 kΩ. Calculate R1 based on the desired
VINTH reset threshold voltage, using the following equation:
08169-004
The ADM6339 is a compact, low power supervisory circuit that
is capable of monitoring up to four voltages in a multisupply
application.
Figure 15. Setting the 1.23 V Adjustable Monitor
The same approach is taken when using the 0.62 V (typical)
adjustable threshold input. Use the following equation to solve
for the values of R1 and R2:
VINTH = 0.62 V((R1 + R2)/(R2))
The 0.62 V (typical) adjustable threshold input offers high
threshold accuracy of ±0.8%.
Rev. A | Page 8 of 12
ADM6339
When monitoring a voltage more negative than −0.5 V, a
scheme similar to that previously described in the Monitoring
Negative Voltages < −5.0 V section is used. For an input
monitor current error of <1%, the resistor network current
should be ≥500 μA (for IIN4 = 5 μA maximum). Calculate R1
based on the desired VINTH reset threshold voltage, using the
following equation:
R1 = R2((VINTH/VTH) − 1)
RESET is open drain with a weak internal pull-up to IN2 of
10 μA (typical). Many applications that interface with other
logic devices do not require an external pull-up resistor.
However, if an external pull-up resistor is required and it is
connected to a voltage ranging from 0 V to 5.5 V, the resistor
overdrives the internal pull-up. Reverse current flow from the
external pull-up voltage to IN2 is prevented by the internal
circuitry.
IN2 = 3.3V
where VINTH is the desired threshold voltage and VTH is the
internal threshold voltage, −0.487 V (typical).
RESET OUTPUT CONFIGURATION
ADM6339
INx
VTH
tRD
tRP
10%
08169-017
90%
RESET
Figure 16. ADM6339 RESET Timing
Rev. A | Page 9 of 12
RESET
100kΩ
VCC
RESET
08169-006
The RESET output asserts low if a monitored INx voltage
drops below its voltage threshold (or goes above its associated
threshold in the case of the −0.5 V and −5.0 V input options).
After all voltages exceed their associated threshold level, the
reset signal remains low for the reset timeout period, tRP
(200 ms typical).
5V
Figure 17. Interfacing with a Different Logic Supply Voltage
ADM6339
OUTLINE DIMENSIONS
3.00
2.90
2.80
1.70
1.60
1.50
6
5
4
1
2
3
3.00
2.80
2.60
PIN 1
INDICATOR
0.95 BSC
1.90
BSC
1.45 MAX
0.95 MIN
0.15 MAX
0.05 MIN
0.50 MAX
0.30 MIN
0.20 MAX
0.08 MIN
SEATING
PLANE
10°
4°
0°
0.60
BSC
0.55
0.45
0.35
121608-A
1.30
1.15
0.90
COMPLIANT TO JEDEC STANDARDS MO-178-AB
Figure 18. 6-Lead Small Outline Transistor Package [SOT-23]
(RJ-6)
Dimensions shown in millimeters
ROUND SPROCKET HOLES
08169-018
PIN 1 MARKER
DIRECTION OF FEED
Figure 19. ADM6339 Reel Orientation
ORDERING GUIDE
1, 2
Model
ADM6339AARJZ-RL7
ADM6339BARJZ-RL7
ADM6339CARJZ-RL7
ADM6339DARJZ-RL7
ADM6339EARJZ-RL7
ADM6339FARJZ-RL7
ADM6339GARJZ-RL7
ADM6339HARJZ-RL7
ADM6339IARJZ-RL7
ADM6339JARJZ-RL7
ADM6339KARJZ-RL7
ADM6339LARJZ-RL7
ADM6339MARJZ-RL7
ADM6339NARJZ-RL7
ADM6339OARJZ-RL7
ADM6339PARJZ-RL7
ADM6339QARJZ-RL7
1
2
Nominal Input Voltage (V)
IN1
IN2 IN3
IN4
5.0
3.3 2.5
Adj (1.23)
5.0
3.3 2.5
Adj (1.23)
5.0
3.3 1.8
Adj (1.23)
5.0
3.3 1.8
Adj (1.23)
5.0
3.0 2.5
Adj (1.23)
5.0
3.0 2.5
Adj (1.23)
5.0
3.0 1.8
Adj (1.23)
5.0
3.0 1.8
Adj (1.23)
5.0
3.3 2.5
1.8
5.0
3.3 2.5
1.8
Adj (1.23) 3.3 2.5
Adj (1.23)
Adj (1.23) 3.3 2.5
Adj (1.23)
5.0
3.0 Adj (1.23) −5.0
5.0
3.0 Adj (1.23) −5.0
5.0
3.3 Adj (1.23) −5.0
5.0
3.3 Adj (1.23) −5.0
Adj (0.62) 3.3 Adj (0.62) Adj (−0.5)
Tolerance
(%)
10
5
10
5
10
5
10
5
10
5
10
5
10
5
10
5
10
Z = RoHS Compliant Part.
Nominal input voltage is specified with 10% tolerance.
Rev. A | Page 10 of 12
Temperature
Range
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
Package
Description
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
6-Lead SOT-23
Package
Option
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
RJ-6
Branding
MBF
MBH
MBJ
MBK
MBL
MBM
MBN
MBP
MBQ
MBR
MBS
MBU
MB6
MB7
MB8
MB5
MBX
ADM6339
NOTES
Rev. A | Page 11 of 12
ADM6339
NOTES
©2009–2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D08169-0-10/10(A)
Rev. A | Page 12 of 12