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MAX16000–MAX16007
General Description
The MAX16000–MAX16007 are low-voltage, quad/hex/
octal-voltage μP supervisors in small TQFN and TSSOP
packages. These devices provide supervisory functions
for complex multivoltage systems. The MAX16000/
MAX16001/MAX16002 monitor four voltages, the
MAX16003/MAX16004/MAX16005 monitor six voltages,
and the MAX16006/MAX16007 monitor eight voltages.
The
MAX16000/MAX16001/MAX16003/MAX16004/
MAX16006 offer independent outputs for each
monitored voltage. The MAX16001/MAX16002/
MAX16004–MAX16007 offer a reset output that asserts
whenever any of the monitored voltages fall below their
respective thresholds or the manual reset input is asserted.
The reset output remains asserted for the reset timeout
after all voltages are above their respective thresholds
and the manual reset input is deasserted. The minimum
reset timeout is internally set to 140ms or can be adjusted
with an external capacitor.
All open-drain outputs have internal 30μA pullups that
eliminate the need for external pullup resistors. However,
each output can be driven with an external voltage up to
5.5V. Other features offered include a manual reset input,
a tolerance pin for selecting 5% or 10% input thresholds,
and a margin enable function for deasserting the outputs
during margin testing.
The MAX16001/MAX16002/MAX16004–MAX16007 offer
a watchdog timer that asserts RESET or an independent
watchdog output (MAX16005) when the watchdog timeout
period (1.6s typ) is exceeded. The watchdog timer can be
disabled by leaving the input open.
These devices are offered in 12, 16, 20, and 24-pin TQFN
and 16-pin TSSOP packages. These are fully specified
from -40°C to +125°C.
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Benefits and Features
●● Fixed Thresholds for 5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V,
1.2V, and 0.9V Systems
●● Adjustable Thresholds Monitor Voltages Down to 0.4V
●● Open-Drain Outputs with Internal Pullups Reduce the
Number of External Components
●● Fixed 140ms (min) or Capacitor-Adjustable Reset
Timeout
●● Manual Reset, Margin Enable, and Tolerance Select
Inputs
●● Watchdog Timer
• 1.6s (typ) Timeout Period
• 54s Startup Delay After Reset (Except MAX16005)
●● Independent Watchdog Output (MAX16005)
●● RESET Output Indicates All Voltages Present
●● Independent Voltage Monitors
●● Guaranteed Correct Logic State Down to VCC = 1V
●● Small (4mm x 4mm) TQFN Package
●● TSSOP (5mm x 4.4mm) Package (MAX16005)
●● AEC-Q100 Qualified (MAX16001ATE/V+ and
MAX16001DTE/V+ Only)
Typical Operating Circuit
VCC SRT
MARGIN
VIN1
IN1
VIN2
IN2
VIN3
IN3
VIN4
IN4
VIN5
IN5
WDI
I/O
VIN6
IN6
WDO
NMI
MAX16005
P
RESET
RST
MR
GND TOL
Applications
●●
●●
●●
●●
Storage Equipment
Servers
Networking/Telecommunication Equipment
Multivoltage ASICs
19-3870; Rev 9; 9/18
Selector Guide and Ordering Information appear at end of
data sheet.
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Absolute Maximum Ratings
VCC, OUT_, IN_, RESET, WDO to GND.................-0.3V to +6V
TOL, MARGIN, MR, SRT, WDI, to GND....... -0.3V to VCC + 0.3
Input/Output Current (RESET, MARGIN,
SRT, MR, TOL, OUT_, WDO, WDI)..............................±20mA
Continuous Power Dissipation (TA = +70°C)
12-Pin TQFN (derate 16.9mW/°C above +70°C).......1349mW
16-Pin TQFN (derate 16.9mW/°C above +70°C).......1349mW
20-Pin TQFN (derate 16.9mW/°C above +70°C).......1355mW
24-Pin TQFN (derate 16.9mW/°C above +70°C).......1666mW
16-Pin TSSOP (derate 9.4mW/°C above +70°C).........754mW
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
PACKAGE TYPE: 12 TQFN
Package Code
T1244+4
Outline Number
21-0139
Land Pattern Number
90-0068
PACKAGE TYPE: 16 TSSOP
Package Code
U16+2
Outline Number
21-0066
Land Pattern Number
90-0117
PACKAGE TYPE: 16 TQFN
Package Code
T1644+4
Outline Number
21-0139
Land Pattern Number
90-0070
PACKAGE TYPE: 20 TQFN
Package Code
T2044+3
Outline Number
21-0139
Land Pattern Number
90-0037
PACKAGE TYPE: 24 TQFN
Package Code
T2444+4
Outline Number
21-0139
Land Pattern Number
90-0022
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
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Maxim Integrated │ 2
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Electrical Characteristics
(VCC = 2.0V to 5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
Supply Current
UVLO (Undervoltage Lockout)
SYMBOL
CONDITIONS
MIN
TYP
UNITS
5.5
V
VCC
(Note 2)
ICC
VCC = 3.3V, OUT_, RESET not asserted
(Note 3)
45
65
VCC = 5V, OUT_, RESET not asserted
50
70
VUVLO
1.0
MAX
VCC rising
1.62
1.8
1.98
5V threshold, TOL = GND
4.50
4.625
4.75
5V threshold, TOL = VCC
4.25
4.375
4.50
3.3V threshold, TOL = GND
2.970
3.053
3.135
3.3V threshold, TOL = VCC
2.805
2.888
2.970
3.0V threshold, TOL = GND
2.70
2.775
2.85
3.0V threshold, TOL = VCC
2.55
2.625
2.70
2.5V threshold, TOL = GND
2.250
2.313
2.375
2.5V threshold, TOL = VCC
2.125
2.188
2.250
1.8V threshold, TOL = GND
1.62
1.665
1.71
1.8V threshold, TOL = VCC
1.53
1.575
1.62
1.5V threshold, TOL = GND
1.350
1.388
1.425
1.5V threshold, TOL = VCC
1.275
1.313
1.350
1.2V threshold, TOL = GND
1.08
1.11
1.14
1.2V threshold, TOL = VCC
1.02
1.05
1.08
0.9V threshold, TOL = GND
0.810
0.833
0.855
0.9V threshold, TOL = VCC
0.765
0.788
0.810
TOL = GND
0.388
0.394
0.400
TOL = VCC
0.366
0.372
0.378
µA
V
IN_ (See Table 1)
Threshold Voltages (IN_ Falling)
Adjustable Threshold
(IN_ Falling)
IN_ Hysteresis
IN_ Input Current
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VTH
VTH
VTH_HYS
IN_ rising
0.5
Fixed thresholds
Adjustable thresholds
3
-100
V
V
% VTH
16
µA
+100
nA
Maxim Integrated │ 3
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Electrical Characteristics (continued)
(VCC = 2.0V to 5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 1)
RESET
PARAMETER
Reset Timeout
SYMBOL
tRP
CONDITIONS
MIN
ISRT
140
200
280
CSRT = 1500pF (Note 4)
2.43
3.09
3.92
CSRT = 100pF
VSRT = 0V
SRT Threshold
RESET Output-Voltage Low
RESET Output-Voltage High
tRD
VOL
VOH
50
MR Input-Voltage Low
VIL
MR Input-Voltage High
VIH
µs
460
600
740
nA
1.235
1.293
V
100
mV
20
µs
VCC = 3.3V, ISINK = 10mA, RESET asserted
0.30
VCC = 2.5V, ISINK = 6mA, RESET asserted
0.30
VCC = 1.2V, ISINK = 50µA, RESET asserted
0.30
0.8 x VCC
0.3 x VCC
µs
100
MR to Reset Delay
ns
200
MR Pullup Resistance
Pulled up to VCC
12
V
V
1
MR Glitch Rejection
V
V
0.7 x VCC
MR Minimum Pulse Width
ms
1.173
IN_ falling
VCC ≥ 2.0V, ISOURCE = 6µA, RESET
deasserted
UNITS
0.206
SRT Hysteresis
IN_ to Reset Delay
MAX
SRT = VCC
CSRT = open
SRT Ramp Current
TYP
20
ns
28
kΩ
OUTPUTS (OUT_ )
OUT_ Output-Voltage Low
VOL
OUT_ Output-Voltage High
VOH
IN_ to OUT_ Propagation Delay
tD
VCC = 3.3V, ISINK = 2mA
0.30
VCC = 2.5V, ISINK = 1.2mA
0.30
VCC R 2.0V, ISOURCE = 6µA
0.8 x VCC
V
V
(VTH + 100mV) to (VTH - 100mV)
20
µs
Shorted to GND
0.8
mA
REFERENCE OUTPUT (MAX16005 Only)
Reference Short-Circuit Current
Reference Output Accuracy
VREF
No load
Line Regulation
Reference Load Regulation
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Sourcing, 0 ≤ IREF ≤ 40µA
1.200
1.235
1.270
V
0.005
%/V
10
Ω
Maxim Integrated │ 4
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Electrical Characteristics (continued)
(VCC = 2.0V to 5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
WATCHDOG TIMER (MAX16001/MAX16002/MAX16004–MAX16007)
WDI Input-Voltage Low
VIL
WDI Input-Voltage High
VIH
WDI Pulse Width
Watchdog Timeout Period
0.3 x VCC
0.7 x VCC
(Note 5)
tWDI
1.6
54
MAX16001/2/4/6/7
35
VWDI = 0 to VCC (Note 5)
-1
VOL
WDO Output-Voltage High
(MAX16005 Only)
VOH
ns
1.12
Watchdog Input Current
WDO Output-Voltage Low
(MAX16005 Only)
V
50
Watchdog Startup Period
2.40
s
72
s
+1
µA
VCC = 3.3V, ISINK = 2mA
0.30
VCC = 2.5V, ISINK = 1.2mA
0.30
VCC ≥ 2.0V, ISOURCE = 6µA, WDO
deasserted
V
0.8 x VCC
V
V
DIGITAL LOGIC
TOL Input-Voltage Low
VIL
TOL Input-Voltage High
VIH
TOL Input Current
0.7 x VCC
VIL
MARGIN Input-Voltage High
VIH
MARGIN Pullup Resistance
tMD
100
0.3 x VCC
0.7 x VCC
Pulled up to VCC
Rising or falling (Note 6)
12
V
V
TOL = VCC
MARGIN Input-Voltage Low
MARGIN Delay Time
0.3 x VCC
nA
V
V
20
50
28
kΩ
µs
Note
Note
Note
Note
1: Devices are tested at TA = +25°C and guaranteed by design for TA = TMIN to TMAX.
2: The outputs are guaranteed to be in the correct logic state down to VCC = 1V.
3: Measured with WDI, MARGIN, and MR unconnected.
4: The minimum and maximum specifications for this parameter are guaranteed by using the worst case of the SRT ramp current and SRT threshold specifications.
Note 5: Guaranteed by design and not production tested.
Note 6: Amount of time required for logic to lock/unlock outputs from margin testing.
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Maxim Integrated │ 5
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Typical Operating Characteristics
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
40
45
VCC = 2.5V
35
30
30
2.0
2.5 3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
5.0
5.5
NORMALIZED THRESHOLD
vs. TEMPERATURE
MAX16000 toc04
1.000
VOUT_ (mV)
0.997
OUTPUT GOES LOW
ABOVE THIS LINE
500
400
300
200
100
198
197
196
MAX16000 toc03
1.000
0.998
0.995
0.990
1000
1.5
2.0
2.5 3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE vs. SOURCE CURRENT
800
600
400
200
OUT_ LOW
0
1
2
3
4
5
6
SINK CURRENT (mA)
7
8
RESET TIMEOUT PERIOD
vs. TEMPERATURE
0
OUT_ HIGH
0
5
10
15
20
25
SOURCE CURRENT (µA)
10
100
INPUT OVERDRIVE (mV)
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1000
30
RESET TIMEOUT DELAY
MAX16000 toc09
IN1
5V/div
195
OUT1
2V/div
194
193
RESET
2V/div
192
191
1
5.0
MAX16000 toc08
MAXIMUM TRANSIENT DURATION
vs. INPUT OVERDRIVE
RESET TIMEOUT PERIOD (ms)
MAXIMUM TRANSIENT DURATION (µs)
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
600
0
50
25
0.996
1.003
VCC - VOUT_ (mV)
75
0.998
0.995
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
100
0.999
1.005
0.993
OUTPUT VOLTAGE vs. SINK CURRENT
MAX16000 toc07
NORMALIZED THRESHOLD
1.001
VCC = 3.3V
40
35
1.5
MAX16000 toc02
50
1.008
MAX16000 toc06
45
VCC = 5V
1.010
NORMALIZED THRESHOLD
50
WDI, MARGIN, AND MR UNCONNECTED
55
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
55
60
NORMALIZED THRESHOLD
vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
MAX16000 toc05
WDI, MARGIN, AND MR UNCONNECTED
MAX16000 toc01
60
SUPPLY CURRENT vs. SUPPLY VOLTAGE
190
SRT = VCC
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
40ms/div
Maxim Integrated │ 6
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
RESET TIMEOUT PERIOD
vs. CSRT
10
1
0.1
0.1
1
10
100
MAX16000 toc12
1.58
MARGIN
2V/div
1.57
1.56
1.55
OUT_
2V/div
1.54
1.53
1.52
MARGIN DISABLE FUNCTION
REFERENCE VOLTAGE
vs. SOURCE CURRENT
REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
MAX16005
1.255
MARGIN
2V/div
1.250
1.245
RESET
2V/div
OUT_ AND RESET ARE BELOW RESPECTIVE
THRESHOLDS
100µs/div
1.235
1.235
1.230
1.230
1.225
1.225
0
200
300
400
500
SOURCE CURRENT (µA)
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX16005
1.26
1.25
1.24
1.23
1.22
1.21
1.20
100
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
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600
1.220
1.5
2.0
2.5 3.0 3.5 4.0 4.5
SUPPLY VOLTAGE (V)
5.0
5.5
TRANSIENT DURATION
vs. VCC TRANSIENT MAGNITUDE
10
MAXIMUM TRANSIENT DURATION (µs)
1.27
1.240
MAX16000 toc16
1.28
1.250
1.245
1.240
1.220
MAX16005
1.255
MAX16000 toc17
OUT_
2V/div
1.260
REFERENCE VOLTAGE (V)
1.260
MAX16000 toc15
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
100µs/div
CSRT (nF)
MAX16000 toc13
RESET
2V/div
OUT_ AND RESET ARE
BELOW RESPECTIVE
THRESHOLDS
1.51
1.50
1000
MAX16000 toc11
1.59
MAX16000 toc14
0.01
VREF (V)
0.01
REFERENCE VOLTAGE (V)
tRP (ms)
100
MARGIN ENABLE FUNCTION
1.60
WATCHDOG TIMEOUT PERIOD (s)
MAX16000 toc10
1000
9
8
7
RESET, OUT_ASSERT
ABOVE THIS LINE
6
5
4
3
2
1
0
100
1000
TRANSIENT MAGNITUDE (VCC - V) (mV)
Maxim Integrated │ 7
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
IN1 10
MAX16000
5
OUT3
IN2 11
4
VCC
SRT
1
2
3
1
IN3
+
GND
TOL 12
MAX16002
IN4
+
IN1 10
7
IN3
RESET 13
MAX16001
IN2 15
OUT4
IN2 14
6
OUT3
IN3 15
5
VCC
MAX16003
+
3
4
1
IN4
TOL 16
9
2
TQFN
(4mm x 4mm)
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7
10
GND
IN3
1
IN1 13
11
WDI
+
MR
12
IN4
TOL 16
8
MARGIN
9
2
3
4
GND
10
OUT3
SRT
11
TOP VIEW
OUT2
MARGIN
12
IN1 14
MR
5
VCC
4
GND
8
OUT6
7
OUT5
6
OUT4
5
VCC
3
OUT1
OUT2
TOP VIEW
6
TQFN
(4mm x 4mm)
OUT1
TQFN
(4mm x 4mm)
2
IN6
TOL 12
OUT4
8
IN5
IN2 11
6
9
WDI
7
MARGIN
8
IN4
MARGIN
9
TOP VIEW
RESET
OUT2
TOP VIEW
OUT1
Pin Configurations
TQFN
(4mm x 4mm)
Maxim Integrated │ 8
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
MR
IN1 17
9
OUT6
8
OUT5
7
OUT4
6
VCC
MAX16004
IN3 19
MARGIN
SRT
OUT8
10
OUT7
9
OUT6
8
OUT5
7
VCC
IN2 21
MAX16006
IN3 22
IN4 23
+
2
GND
IN5
IN6
TOL 24
1
RESET
MARGIN
SRT
MR
10
9
IN2 14
MAX16005
+
3
4
5
TQFN
(4mm x 4mm)
6
TOP VIEW
IN3 1
8
WDO
7
REF
6
VCC
5
GND
IN5 4
N.C.
MARGIN
SRT
TQFN
(4mm x 4mm)
15 IN1
15
14
13
12
11
14 RESET
MAX16005
12 SRT
WDI 6
11 MR
GND 7
10 WDO
VCC 8
9 REF
TSSOP
10
MR
IN2 17
9
N.C.
8
N.C.
7
VCC
6
GND
IN3 18
MAX16007
IN4 19
2
3
4
5
IN7
IN8
WDI
IN5
1
IN6
+
13 MARGIN
IN6 5
IN1 16
TOL 20
16 IN2
IN4 3
N.C.
TOP VIEW
+
TOL 2
4
WDI
3
IN6
IN5
2
IN4
11
5
11
1
IN1 20
4
IN1 13
TOL 16
MR
3
12
IN3 15
12
2
TQFN
(4mm x 4mm)
TOP VIEW
13
WDI
IN4
1
14
IN6
+
15
IN5
TOL 20
16
RESET 19
RESET
IN2 18
17
GND
10
18
WDI
RESET 16
OUT4
11
IN8
12
OUT3
SRT
13
IN7
MARGIN
14
OUT2
OUT3
15
TOP VIEW
OUT1
OUT2
TOP VIEW
OUT1
Pin Configurations (continued)
TQFN
(4mm x 4mm)
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Maxim Integrated │ 9
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Pin Description (MAX16000/MAX16001/MAX16002)
MAX16000
MAX16001
MAX16002
PIN
1
1
1
IN3
Monitored Input Voltage 3. See Table 1 for the input voltage threshold.
2
2
2
IN4
Monitored Input Voltage 4. See Table 1 for the input voltage threshold.
3
4
4
GND
Ground
4
5
5
VCC
Unmonitored Power-Supply Input. Bypass VCC with a 0.1µF capacitor to ground. See Power
Supply Bypassing section for more detail.
5
6
—
OUT3
Output 3. When the voltage at IN3 falls below its threshold, OUT3 goes low and stays low until the
voltage at IN3 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
6
7
—
OUT4
Output 4. When the voltage at IN4 falls below its threshold, OUT4 goes low and stays low until the
voltage at IN4 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
7
10
8
MARGIN
Active-Low Manual Deassert Input. Pull MARGIN low to deassert all outputs (go into high state),
regardless of the voltage at any monitored input.
8
11
—
OUT2
Output 2. When the voltage at IN2 falls below its threshold, OUT2 goes low and stays low until the
voltage at IN2 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
9
12
—
OUT1
Output 1. When the voltage at IN1 falls below its threshold, OUT1 goes low and stays low until the
voltage at IN1 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
10
14
10
IN1
Monitored Input Voltage 1. See Table 1 for the input voltage threshold.
11
15
11
IN2
Monitored Input Voltage 2. See Table 1 for the input voltage threshold.
12
16
12
TOL
Threshold Tolerance Input. Connect TOL to GND to select 5% threshold tolerance. Connect TOL
to VCC to select 10% threshold tolerance.
NAME
FUNCTION
—
3
3
WDI
Watchdog Timer Input. If WDI remains low or high for longer than the watchdog timeout period,
RESET is asserted. The timer clears whenever a reset is asserted or a rising or falling edge on
WDI is detected. The watchdog timer enters a startup period that allows 54s for the first transition
to occur before a reset. Leave WDI unconnected to disable the watchdog timer. The WDI openstate detector uses a small 400nA current. Therefore, do not connect WDI to anything that will
source or sink more than 200nA. Note that the leakage current specification for most three-state
drivers exceeds 200nA.
—
8
6
MR
Active-Low Manual Reset Input. Pull MR low to assert RESET low. RESET remains low for the
reset timeout period after MR is deasserted. MR is pulled up to VCC through a 20kΩ resistor.
SRT
Set Reset Timeout Input. Connect a capacitor from SRT to GND to set the reset timeout period.
The reset timeout period can be calculated as follows:
Reset Timeout (s) = 2.06 x 106 (Ω) x CSRT (F). For the internal timeout period of 140ms (min),
connect SRT to VCC.
—
9
7
—
13
9
RESET
—
—
—
EP
www.maximintegrated.com
Active-Low Reset Output. RESET asserts low when any of the monitored voltages falls below
its respective threshold or MR is asserted. RESET remains asserted for the reset timeout period
after all monitored voltages exceed their respective thresholds and MR is deasserted. This opendrain output has a 30µA internal pullup.
Exposed Pad. EP is internally connected to GND. Connect EP to the ground plane to provide
a low thermal resistance path from the IC junction to the PCB. Do not use as the electrical
connection to GND.
Maxim Integrated │ 10
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Pin Description (MAX16003/MAX16004/MAX16005)
MAX16005
TSSOP
MAX16005
TQFN
MAX16004
MAX16003
PIN
1
1
3
1
IN4
Monitored Input Voltage 4. See Table 1 for the input voltage threshold.
2
2
4
2
IN5
Monitored Input Voltage 5. See Table 1 for the input voltage threshold.
3
3
5
3
IN6
Monitored Input Voltage 6. See Table 1 for the input voltage threshold.
4
5
7
5
GND
Ground
5
6
8
6
VCC
Unmonitored Power-Supply Input. Bypass VCC with a 0.1µF capacitor to ground. See
Power Supply Bypassing section for more detail.
6
7
—
—
OUT4
Output 4. When the voltage at IN4 falls below its threshold, OUT4 goes low and stays low
until the voltage at IN4 exceeds its threshold. The open-drain output has a 30µA internal
pullup to VCC.
7
8
—
—
OUT5
Output 5. When the voltage at IN5 falls below its threshold, OUT5 goes low and stays low
until the voltage at IN5 exceeds its threshold. The open-drain output has a 30µA internal
pullup to VCC.
8
9
—
—
OUT6
Output 6. When the voltage at IN6 falls below its threshold, OUT6 goes low and stays low
until the voltage at IN6 exceeds its threshold. The open-drain output has a 30µA internal
pullup to VCC.
9
12
13
11
MARGIN
10
13
—
—
OUT3
Output 3. When the voltage at IN3 falls below its threshold, OUT3 goes low and stays low
until the voltage at IN3 exceeds its threshold. The open-drain output has a 30µA internal
pullup to VCC.
11
14
—
—
OUT2
Output 2. When the voltage at IN2 falls below its threshold, OUT2 goes low and stays low
until the voltage at IN2 exceeds its threshold. The open-drain output has a 30µA internal
pullup to VCC.
12
15
—
—
OUT1
Output 1. When the voltage at IN1 falls below its threshold, OUT1 goes low and stays low
until the voltage at IN1 exceeds its threshold. The open-drain output has a 30µA internal
pullup to VCC.
13
17
15
13
IN1
Monitored Input Voltage 1. See Table 1 for the input voltage threshold.
14
18
16
14
IN2
Monitored Input Voltage 2. See Table 1 for the input voltage threshold.
15
19
1
15
IN3
Monitored Input Voltage 3. See Table 1 for the input voltage threshold.
www.maximintegrated.com
NAME
FUNCTION
Manual Deassert Input. Pull MARGIN low to deassert all outputs (go into high state),
regardless of the voltage at any monitored input.
Maxim Integrated │ 11
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Pin Description (MAX16003/MAX16004/MAX16005) (continued)
MAX16003
MAX16004
MAX16005
TSSOP
MAX16005
TQFN
PIN
16
20
2
16
NAME
FUNCTION
TOL
Threshold Tolerance Input. Connect TOL to GND to select 5% threshold tolerance.
Connect TOL to VCC to select 10% threshold tolerance.
—
4
6
4
WDI
Watchdog Timer Input.
MAX16004: If WDI remains low or high for longer than the watchdog timeout period,
RESET is asserted and the timer is cleared. The timer also clears whenever a reset is
asserted or a rising or falling edge on WDI is detected. The watchdog timer enters a
startup period that allows 54s for the first transition to occur before a reset. Leave WDI
unconnected to disable the watchdog timer.
MAX16005: If WDI remains low or high for longer than the watchdog timeout period,
WDO is asserted. The timer clears whenever a rising or falling edge on WDI is detected.
Leave WDI unconnected to disable the watchdog timer. The MAX16005 does not have a
startup period.
MAX16004/MAX16005: The WDI open-state detector uses a small 100nA current.
Therefore, do not connect WDI to anything that will source or sink more than 50nA. Note
that the leakage current specification for most three-state drivers exceeds 50nA.
—
10
11
9
MR
Active-Low Manual Reset Input. Pull MR low to assert RESET low. RESET remains low
for the reset timeout period after MR is deasserted. MR is pulled up to VCC through a
20kΩ resistor.
SRT
Set Reset Timeout Input. Connect a capacitor from SRT to GND to set the reset timeout
period. The reset timeout period can be calculated as follows:
Reset Timeout (s) = 2.06 x 106 (Ω) x CSRT (F). For the internal timeout period of 140ms
(min), connect SRT to VCC.
Active-Low Reset Output. RESET asserts low when any of the monitored voltages falls
below its respective threshold or MR is asserted. RESET remains asserted for the reset
timeout period after all monitored voltages exceed their respective thresholds and MR is
deasserted. This open-drain output has a 30µA internal pullup.
—
11
12
10
—
16
14
12
RESET
—
—
9
7
REF
Reference Output. The reference output voltage of 1.23V can source up to 40µA.
—
—
10
8
WDO
Active-Low Watchdog Output. WDO asserts and stays low whenever any of the IN_
inputs fall below their respective thresholds. WDO deasserts without a timeout delay
when all the IN_ inputs rise above their thresholds. When all the IN_ inputs rise above
their thresholds, WDO asserts low whenever the watchdog timer times out. WDO
deasserts after a valid WDI transition or if MR is pulled low. The watchdog timer begins
counting after the reset timeout period once MR goes high. Pull MARGIN low to deassert
WDO.
—
—
—
—
EP
Exposed Pad. EP is internally connected to GND. Connect EP to the ground plane to
provide a low thermal resistance path from the IC junction to the PCB. Do not use as the
electrical connection to GND.
www.maximintegrated.com
Maxim Integrated │ 12
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Pin Description (MAX16006/MAX16007)
MAX16006
MAX16007
PIN
1
1
IN5
Monitored Input Voltage 5. See Table 1 for the input voltage threshold.
2
2
IN6
Monitored Input Voltage 6. See Table 1 for the input voltage threshold.
3
3
IN7
Monitored Input Voltage 7. See Table 1 for the input voltage threshold.
4
4
IN8
Monitored Input Voltage 8. See Table 1 for the input voltage threshold.
NAME
FUNCTION
5
5
WDI
Watchdog Timer Input. If WDI remains low or high for longer than the watchdog timeout period,
RESET is asserted and the timer is cleared. The timer also clears whenever a reset is asserted or a
rising or falling edge on WDI is detected. The watchdog timer enters a startup period that allows 54s
for the first transition to occur before a reset. Leave WDI unconnected to disable the watchdog timer.
The WDI open-state detector uses a small 400nA current. Therefore, do not connect WDI to anything
that will source or sink more than 200nA. Note that the leakage current specification for most threestate drivers exceeds 200nA.
6
6
GND
Ground
7
7
VCC
Unmonitored Power-Supply Input. Bypass VCC with a 0.1µF capacitor to ground. See Power Supply
Bypassing section for more detail.
8
—
OUT5
Output 5. When the voltage at IN5 falls below its threshold, OUT5 goes low and stays low until the
voltage at IN5 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
9
—
OUT6
Output 6. When the voltage at IN6 falls below its threshold, OUT6 goes low and stays low until the
voltage at IN6 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
10
—
OUT7
Output 7. When the voltage at IN7 falls below its threshold, OUT7 goes low and stays low until the
voltage at IN7 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
11
—
OUT8
Output 8. When the voltage at IN8 falls below its threshold, OUT8 goes low and stays low until the
voltage at IN8 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
12
10
MR
Active-Low Manual Reset Input. Pull MR low to assert RESET low. RESET remains low for the reset
timeout period after MR is deasserted. MR is pulled up to VCC through a 20kΩ resistor.
SRT
Set Reset Timeout Input. Connect a capacitor from SRT to GND to set the reset timeout period. The
reset timeout period can be calculated as follows:
Reset Timeout (s) = 2.06 x 106 (Ω) x CSRT (F). For the internal timeout period of 140ms (min),
connect SRT to VCC.
13
11
www.maximintegrated.com
Maxim Integrated │ 13
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Pin Description (MAX16006/MAX16007) (continued)
MAX16006
MAX16007
PIN
14
12
MARGIN
15
—
OUT4
Output 4. When the voltage at IN4 falls below its threshold, OUT4 goes low and stays low until the
voltage at IN4 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
16
—
OUT3
Output 3. When the voltage at IN3 falls below its threshold, OUT3 goes low and stays low until the
voltage at IN3 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
17
—
OUT2
Output 2. When the voltage at IN2 falls below its threshold, OUT2 goes low and stays low until the
voltage at IN2 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
18
—
OUT1
Output 1. When the voltage at IN1 falls below its threshold, OUT1 goes low and stays low until the
voltage at IN1 exceeds its threshold. The open-drain output has a 30µA internal pullup to VCC.
NAME
FUNCTION
Margin Disable Input. Pull MARGIN low to deassert all outputs (go into high state), regardless of the
voltage at any monitored input.
Active-Low Reset Output. RESET asserts low when any of the monitored voltages falls below its
respective threshold or MR is asserted. RESET remains asserted for the reset timeout period after all
monitored voltages exceed their respective thresholds and MR is deasserted. This open-drain output
has a 30µA internal pullup.
19
15
RESET
20
16
IN1
Monitored Input Voltage 1. See Table 1 for the input voltage threshold.
21
17
IN2
Monitored Input Voltage 2. See Table 1 for the input voltage threshold.
22
18
IN3
Monitored Input Voltage 3. See Table 1 for the input voltage threshold.
23
19
IN4
Monitored Input Voltage 4. See Table 1 for the input voltage threshold.
24
20
TOL
Threshold Tolerance Input. Connect TOL to GND to select 5% threshold tolerance. Connect TOL to
VCC to select 10% threshold tolerance.
—
8, 9,
13, 14
N.C.
Not Internally Connected
—
—
EP
www.maximintegrated.com
Exposed Pad. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal
resistance path from the IC junction to the PCB. Do not use as the electrical connection to GND.
Maxim Integrated │ 14
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Table 1. Input-Voltage-Threshold Selector
PART
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
MAX16000A
3.3
2.5
ADJ
1.8
—
—
—
—
MAX16000B
3.3
ADJ
ADJ
1.8
—
—
—
—
MAX16000C
ADJ
2.5
ADJ
1.8
—
—
—
—
MAX16000D
3.3
2.5
ADJ
ADJ
—
—
—
—
MAX16000E
ADJ
ADJ
ADJ
ADJ
—
—
—
—
MAX16001A
3.3
2.5
ADJ
1.8
—
—
—
—
MAX16001B
3.3
ADJ
ADJ
1.8
—
—
—
—
MAX16001C
ADJ
2.5
ADJ
1.8
—
—
—
—
MAX16001D
3.3
2.5
ADJ
ADJ
—
—
—
—
MAX16001E
ADJ
ADJ
ADJ
ADJ
—
—
—
—
MAX16002A
3.3
2.5
ADJ
1.8
—
—
—
—
MAX16002B
3.3
ADJ
ADJ
1.8
—
—
—
—
MAX16002C
ADJ
2.5
ADJ
1.8
—
—
—
—
MAX16002D
3.3
2.5
ADJ
ADJ
—
—
—
—
MAX16002E
ADJ
ADJ
ADJ
ADJ
—
—
—
—
MAX16003A
3.3
2.5
ADJ
1.8
ADJ
ADJ
—
—
MAX16003B
3.3
ADJ
ADJ
1.8
ADJ
ADJ
—
—
MAX16003C
3.3
2.5
ADJ
ADJ
ADJ
ADJ
—
—
MAX16003D
ADJ
2.5
ADJ
1.8
ADJ
ADJ
—
—
MAX16003E
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
—
—
MAX16004A
3.3
2.5
ADJ
1.8
ADJ
ADJ
—
—
MAX16004B
3.3
ADJ
ADJ
1.8
ADJ
ADJ
—
—
MAX16004C
3.3
2.5
ADJ
ADJ
ADJ
ADJ
—
—
MAX16004D
ADJ
2.5
ADJ
1.8
ADJ
ADJ
—
—
MAX16004E
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
—
—
MAX16005A
3.3
2.5
ADJ
1.8
ADJ
ADJ
—
—
MAX16005B
3.3
ADJ
ADJ
1.8
ADJ
ADJ
—
—
MAX16005C
3.3
2.5
ADJ
ADJ
ADJ
ADJ
—
—
MAX16005D
ADJ
2.5
ADJ
1.8
ADJ
ADJ
—
—
MAX16005E
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
—
—
MAX16006A
3.3
2.5
ADJ
1.8
ADJ
ADJ
ADJ
ADJ
MAX16006B
3.3
ADJ
ADJ
1.8
ADJ
ADJ
ADJ
ADJ
MAX16006C
3.3
2.5
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
MAX16006D
ADJ
2.5
ADJ
1.8
ADJ
ADJ
ADJ
ADJ
MAX16006E
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
MAX16006F
5.0
3.3
3.0
2.5
1.8
1.5
1.2
0.9
MAX16007A
3.3
2.5
ADJ
1.8
ADJ
ADJ
ADJ
ADJ
MAX16007B
3.3
ADJ
ADJ
1.8
ADJ
ADJ
ADJ
ADJ
MAX16007C
3.3
2.5
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
MAX16007D
ADJ
2.5
ADJ
1.8
ADJ
ADJ
ADJ
ADJ
MAX16007E
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
ADJ
Note: Other fixed thresholds may be available. Contact factory for availability.
www.maximintegrated.com
Maxim Integrated │ 15
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Functional Diagrams
MAX16000D Functional Diagram
VCC
VCC
RESET
CIRCUIT
IN1
OUT1
IN2
OUT2
OUTPUT
DRIVER
IN3
OUT3
EN
OUT4
IN4
VCC
TOL
REFERENCE
VCC
UNDERVOLTAGE LOCKOUT
MAX16000
VCC
MARGIN
www.maximintegrated.com
Maxim Integrated │ 16
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Functional Diagrams (continued)
MAX16001D/MAX16002D Functional Diagram
WDI
MR
SRT
VCC
VCC
WATCHDOG
TIMER CIRCUIT
TIMING
RESET CIRCUIT
RESET
IN1
(OUT1)
IN2
(OUT2)
OUTPUT
DRIVER
IN3
(OUT3)
EN
(OUT4)
IN4
VCC
TOL
REFERENCE
( ) MAX16001 ONLY
www.maximintegrated.com
VCC
UNDERVOLTAGE LOCKOUT
MAX16001/
MAX16002
VCC
MARGIN
Maxim Integrated │ 17
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Functional Diagrams (continued)
MAX16003C/MAX16004C Functional Diagram
(WDI)
(MR)
(SRT)
VCC
VCC
WATCHDOG
TIMER CIRCUIT
TIMING
RESET CIRCUIT
(RESET)
IN1
OUT1
IN2
OUT2
IN3
OUT3
OUTPUT
DRIVER
IN4
OUT4
IN5
OUT5
IN6
EN
VCC
TOL
REFERENCE
( ) MAX16004 ONLY
www.maximintegrated.com
OUT6
VCC
UNDERVOLTAGE LOCKOUT
MAX16003/
MAX16004
VCC
MARGIN
Maxim Integrated │ 18
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Functional Diagrams (continued)
MAX16005C Functional Diagram
WDO
WDI
MR
SRT
VCC
VCC
WATCHDOG
TIMER CIRCUIT
TIMING
RESET CIRCUIT
RESET
IN1
IN2
IN3
OUTPUT
DRIVER
IN4
IN5
IN6
EN
VCC
TOL
VCC
REFERENCE
UNDERVOLTAGE LOCKOUT
REF
www.maximintegrated.com
VCC
MAX16005
MARGIN
Maxim Integrated │ 19
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Functional Diagrams (continued)
MAX16006C/MAX16007C Functional Diagram
WDI
MR
SRT
VCC
VCC
WATCHDOG
TIMER CIRCUIT
TIMING
RESET CIRCUIT
RESET
IN1
(OUT1)
IN2
(OUT2)
IN3
(OUT3)
OUTPUT
DRIVER
IN4
(OUT4)
IN5
(OUT5)
IN6
(OUT6)
IN7
(OUT7)
IN8
EN
VCC
TOL
REFERENCE
( ) MAX16006 ONLY
www.maximintegrated.com
OUT8
VCC
UNDERVOLTAGE LOCKOUT
MAX16006/
MAX16007
VCC
MARGIN
Maxim Integrated │ 20
MAX16000–MAX16007
Detailed Description
The MAX16000–MAX16007 are low-voltage, quad/hex/
octal-voltage μP supervisors in small TQFN and TSSOP
packages. These devices provide supervisory functions
for complex multivoltage systems. The MAX16000/
MAX16001/MAX16002 monitor four voltages, the
MAX16003/MAX16004/MAX16005 monitor six voltages,
and the MAX16006/MAX16007 monitor eight voltages.
The
MAX16000/MAX16001/MAX16003/MAX16004/
MAX16006 offer independent outputs for each
monitored voltage. The MAX16001/MAX16002/MAX16004–
MAX16007 offer a reset output that asserts whenever any
of the monitored voltages fall below their respective thresholds or the manual reset input is asserted. The reset output
remains asserted for the reset timeout after all voltages are
above their respective thresholds and the manual reset input
is deasserted. The minimum reset timeout is internally set to
140ms or can be adjusted with an external capacitor.
All open-drain outputs have internal 30μA pullups that
eliminate the need for external pullup resistors. However,
each output can be driven with an external voltage up to
5.5V. Other features offered include a manual reset input,
a tolerance pin for selecting 5% or 10% input thresholds,
and a margin enable function for deasserting the outputs
during margin testing.
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
Window Detection
A window detector circuit uses two auxiliary inputs in the
configuration shown in Figure 3. External resistors set
the two threshold voltages of the window detector circuit.
External logic gates create the OUT signal. The window
detection width is the difference between the threshold
voltages (Figure 4).
5V
V1
IN1
V2
IN2
V3
IN3
V4
IN4
VCC
MAX16000
MAX16001
OUT1
OUT2
OUT3
OUT4
GND
Figure 1. Quad Undervoltage Detector with LED Indicators
The MAX16001/MAX16002/MAX16004–MAX16007 offer
a watchdog timer that asserts RESET or an independent
watchdog output (MAX16005) when the watchdog timeout
period (1.6s typ) is exceeded. The watchdog timer can be
disabled by leaving input open.
Applications Information
Undervoltage-Detection Circuit
The open-drain outputs of the MAX16000–MAX16007 can
be configured to detect an undervoltage condition. Figure
1 shows a configuration where an LED turns on when the
comparator output is low, indicating an undervoltage condition. These devices can also be used in applications such
as system supervisory monitoring, multivoltage level detection, and VCC bar-graph monitoring (Figure 2).
Tolerance (TOL)
The MAX16000–MAX16007 feature a pin-selectable
threshold tolerance. Connect TOL to GND to select 5%
threshold tolerance. Connect TOL to VCC to select 10%
threshold tolerance.
www.maximintegrated.com
5V
VIN(5V)
IN1
VCC
D1
OUT1
D2
OUT2
IN2
IN3
MAX16000
MAX16001
D3
OUT3
D4
IN4
GND OUT4
Figure 2. VCC Bar-Graph Monitoring
Maxim Integrated │ 21
MAX16000–MAX16007
(
VTH1 = 1 +
) (VTH + VTH_HYS)
R1
R2
R1
IN1
R2
INPUT
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
VINTH
5V
R1
VCC
OUT1
IN2
OUT2
IN4
OUT4
MAX16000
MAX16001
IN3
OUT3
R3
R4
(
VTH4 = 1 +
OUT
R2
VTH
(VVINTH - 1)
R1 = R2
GND
)
TH
Figure 5. Setting the Adjustable Input
R3
V
R4 TH
Adjustable Input
These devices offer several monitor options with adjustable
input thresholds (see Table 1). The threshold voltage at
each adjustable IN_ input is typically 0.394V (TOL = GND)
or 0.372 (TOL = VCC). To monitor a voltage VINTH,
connect a resistive-divider network to the circuit as shown
in Figure 5.
Figure 3. Window Detection
OUT1
V TH1
OUT4
V TH4
R1 = R2 ((VINTH / VTH) - 1)
Large resistors can be used to minimize current through
the external resistors. For greater accuracy, use lowervalue resistors.
Unused Inputs
Connect any unused IN_ inputs to a voltage above its
threshold.
OUT_ Outputs
(MAX16000/MAX16001/MAX16003/
MAX16004/MAX16006)
OUT
V TH
Figure 4. Output Response of Window Detector Circuit
www.maximintegrated.com
VINTH = VTH ((R1 / R2) + 1)
The OUT_ outputs go low when their respective IN_
inputs drop below their specified thresholds. The output
is open drain with a 30μA internal pullup to VCC. For
many applications, no external pullup resistor is required
to interface with other logic devices. An external pullup
resistor to any voltage from 0 to 5.5V overrides the
internal pullup if interfacing to different logic supply
voltages. Internal circuitry prevents reverse current flow
from the external pullup voltage to VCC (Figure 6).
Maxim Integrated │ 22
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
VCC = 3.3V
5V
IN_
VTH_
VTH_
100kΩ
VCC
VCC
RESET
OUT_
90%
RESET
10%
tRD
OUT_
MAX16001/
MAX16002/
MAX16004–MAX16007
GND
tRP
90%
10%
GND
tD
Figure 6. Interfacing to a Different Logic Supply Voltage
Figure 7. Output Timing Diagram
RESET Output (MAX16001/MAX16002/
MAX16004–MAX16007)
WDO (MAX16005 Only)
RESET asserts low when any of the monitored voltages
fall below their respective thresholds or MR is asserted.
RESET remains asserted for the reset timeout period
after all monitored voltages exceed their respective
thresholds and MR is deasserted (see Figure 7). This
open-drain output has a 30μA internal pullup. An external
pullup resistor to any voltage from 0 to 5.5V overrides the
internal pullup if interfacing to different logic supply
voltages. Internal circuitry prevents reverse current flow
from the external pullup voltage to VCC (Figure 6).
www.maximintegrated.com
tD
WDO asserts and stays low whenever any of the IN_
inputs fall below their respective thresholds. WDO deasserts
without a timeout delay when all the IN_inputs rise above
their thresholds. When all the IN_ inputs rise above their
thresholds, WDO asserts low whenever the watchdog
timer times out. WDO deasserts after a valid WDI transition
or if MR is pulled low. The watchdog timer begins counting
after the reset timeout period once MR goes high. Pull
MARGIN low to deassert WDO regardless of any other
condition. The watchdog timer continues to run when
MARGIN is low and if a timeout occurs. WDO will assert
MR after MARGIN is deasserted. This open-drain output
has a 30μA internal pullup. An external pullup resistor to
any voltage from 0 to 5.5V overrides the internal pullup
if interfacing to different logic supply voltages. Internal
circuitry prevents reverse current flow from the external
pullup voltage to VCC (Figure 6).
Maxim Integrated │ 23
MAX16000–MAX16007
Low-Voltage, Quad/Hex/Octal-Voltage
μP Supervisors
VTH + VTH_HYST
VTH
VIN
RESET
tRP
VTH + VTH_HYST
tRP
WDO
WDI
t
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