MAX6715A–MAX6729A/
MAX6797A
Dual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
General Description
The MAX6715A–MAX6729A/MAX6797A are ultra-low-
voltage microprocessor (μP) supervisory circuits designed to
monitor two or three system power-supply voltages. These
devices assert a system reset if any monitored supply falls
below its factory-trimmed or adjustable threshold and main-
tain reset for a minimum timeout period after all supplies rise
above their thresholds. The integrated dual/triple superviso-
ry circuits significantly improve system reliability and reduce
size compared to separate ICs or discrete components.
These devices monitor primary supply voltages (V
CC1
)
from 1.8V to 5.0V and secondary supply voltages (V
CC
2)
from 0.9V to 3.3V with factory-trimmed reset threshold
voltage options (see the
Reset Voltage Threshold Suffix
Guide).
An externally adjustable RSTIN input option
allows customers to monitor a third supply voltage down
to 0.62V. These devices are guaranteed to be in the cor-
rect reset output logic state when either V
CC1
or V
CC2
remains greater than 0.8V.
A variety of push-pull or open-drain reset outputs along
with watchdog input, manual-reset input, and power-fail
input/output features are available (see the Selector
Guide). Select reset timeout periods from 1.1ms to
1120ms (min) (see the
Reset Timeout Period Suffix
Guide).
The MAX6715A–MAX6729A/MAX6797A are
available in small 5-, 6-, and 8-pin SOT23 packages and
operate over the -40°C to +125°C temperature range.
● Multivoltage Systems
● Telecom/Networking
Equipment
● Computers/Servers
● Portable/Battery-
Operated Equipment
● V
CC1
(Primary Supply) Reset Threshold Voltages
from 1.58V to 4.63V
● V
CC2
(Secondary Supply) Reset Threshold Voltages
from 0.79V to 3.08V
● Externally Adjustable RSTIN Threshold for Auxiliary/
Triple-Voltage Monitoring (0.62V Internal Reference)
● Watchdog Timer Option
• 35s (min) Long Startup Period
• 1.12s (min) Normal Timeout Period
● Manual-Reset Input Option
● Power-Fail Input/Power-Fail Output Option
(Push-Pull and Open-Drain Active-Low)
● Guaranteed Reset Valid Down to V
CC1
or
V
CC2
= 0.8V
● Reset Output Logic Options
● Immune to Short V
CC
Transients
● Low Supply Current 14μA (typ) at 3.6V
● Watchdog Disable Feature
● Small 5, 6, and 8-Pin SOT23 Packages
● AEC-Q100 Qualified: MAX6719AUTTWD1/V+T
Ordering Information
continued at end of data sheet.
Pin Description
and
Selector Guide
appear at end of data
sheet.
Features
Applications
● Industrial Equipment
● Printers/Fax Machines
● Set-Top Boxes
Typical Operating Circuit
UNREGULATED
DC
DC-DC OUT2
IN CONVERTER
OUT1
V
CC1
R1
V
CC2
1.8V
0.9V
MAX6715A-
MAX6729A/
MAX6797A
RST
RSTIN/PFI
WDI
PFO
MAX67_ _
MR
PUSHBUTTON
SWITCH
I/O
CORE
SUPPLY SUPPLY
RESET
I/O
NMI
µP
R2
19-0536; Rev 5; 10/17
MAX6715A–MAX6729A/
MAX6797A
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
V
CC1
, V
CC2
.........................................................-0.3V to +6V
Open-Drain
RST, RST1, RST2, PFO,
RST ............-0.3V to +6V
Push-Pull RST,
RST1, PFO, RST
.......... -0.3V to (V
CC1
+ 0.3V)
Push-Pull
RST2
...................................... -0.3V to (V
CC2
+ 0.3V)
RSTIN, PFI,
MR,
WDI .............................................-0.3V to +6V
Input Current/Output Current (all pins) ...............................20mA
Dual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) .......571mW
6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) .......696mW
8-Pin SOT23-8 (derate 8.9mW/°C above +70°C) .......714mW
Operating Temperature Range ......................... -40°C to +125°C
Storage Temperature Range ............................ -65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°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.
Electrical Characteristics
(V
CC1
= 0.8V to 5.5V, V
CC2
= 0.8V to 5.5V, GND = 0V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
=
+25°C.) (Note 1)
PARAMETER
Supply Voltage
SYMBOL
V
CC
I
CC1
Supply Current
I
CC2
V
CC1
< 5.5V all I/O connections open,
outputs not asserted
V
CC1
< 3.6V all I/O connections open,
outputs not asserted
V
CC2
< 3.6V all I/O connections open,
outputs not asserted
V
CC2
< 2.75V all I/O connections open,
outputs not asserted
L (falling)
M (falling)
T (falling)
S (falling)
V
CC1
Reset Threshold
V
TH1
R (falling)
Z (falling)
Y (falling)
W (falling)
V (falling)
T (falling)
S (falling)
R (falling)
Z (falling)
Y (falling)
W (falling)
V
CC2
Reset Threshold
V
TH2
V (falling)
I (falling)
H (falling)
G (falling)
F (falling)
E (falling)
D (falling)
4.500
4.250
3.000
2.850
2.550
2.250
2.125
1.620
1.530
3.000
2.850
2.550
2.250
2.125
1.620
1.530
1.350
1.275
1.080
1.020
0.810
0.765
CONDITIONS
MIN
0.8
15
10
4
3
4.625
4.375
3.075
2.925
2.625
2.313
2.188
1.665
1.575
3.075
2.925
2.625
2.313
2.188
1.665
1.575
1.388
1.313
1.110
1.050
0.833
0.788
TYP
MAX
5.5
39
28
µA
11
9
4.750
4.500
3.150
3.000
2.700
2.375
2.250
1.710
1.620
3.150
3.000
2.700
2.375
2.250
1.710
1.620
1.425
1.350
1.140
1.080
0.855
0.810
Maxim Integrated │
2
UNITS
V
V
V
www.maximintegrated.com
MAX6715A–MAX6729A/
MAX6797A
Electrical Characteristics (continued)
Dual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
(V
CC1
= 0.8V to 5.5V, V
CC2
= 0.8V to 5.5V, GND = 0V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
=
+25°C.) (Note 1)
PARAMETER
Reset Threshold Tempco
Reset Threshold Hysteresis
V
CC
to Reset Output Delay
SYMBOL
ΔV
TH
/°C
V
HYST
t
RD
Referenced to V
TH
typical
V
CC1
= (V
TH1
+ 100mV) to (V
TH1
- 100mV) or
V
CC2
= (V
TH2
+ 75mV) to (V
TH2
- 75mV)
D1
D2
D7 (MAX6797A only)
Reset Timeout Period
t
RP
D8 (MAX6797A only)
D3
D5
D6
D4
RSTIN Input Threshold
RSTIN Input Current
RSTIN Hysteresis
RSTIN to Reset Output Delay
PFI Input Threshold
PFI Input Current
PFI Hysteresis
PFI to
PFO
Delay
t
RSTIND
V
PFI
I
PFI
V
PFH
t
DPF
V
IL
V
IH
0.7 x V
CC1
1
100
t
MR
25
First watchdog period after reset timeout
period
Normal mode
(Note 2)
200
50
80
(V
PFI
+ 30mV) to (V
PFI
- 30mV)
V
RSTIN
to (V
RSTIN
- 30mV)
611
-100
3
2
0.3 x V
CC1
POWER-FAIL INPUT (MAX6728A/MAX6729A)
626.5
642
+100
mV
nA
mV
µs
V
RSTIN
I
RSTIN
1.1
8.8
17.5
35
140
280
560
1120
611
-100
3
22
CONDITIONS
MIN
TYP
20
0.5
20
1.65
13.2
26.25
52.5
210
420
840
1680
626.5
2.2
17.6
35
70
280
560
1120
2240
642
+100
mV
nA
mV
µs
ms
MAX
UNITS
ppm/°C
%
µs
ADJUSTABLE RESET COMPARATOR INPUT (MAX6719A/MAX6720A/MAX6723A–MAX6727A)
MANUAL-RESET INPUT (MAX6715A–MAX6722A/MAX6725A–MAX6729A)
MR
Input Voltage
MR
Minimum Pulse Width
MR
Glitch Rejection
MR
to Reset Delay
MR
Pullup Resistance
WATCHDOG INPUT (MAX6721A–MAX6729A)
Watchdog Timeout Period
WDI Pulse Width
WDI Input Voltage
WDI Input Current
t
WD
t
WDI
V
IL
V
IH
I
WDI
V
WDI
= 0V or V
CC1
35
1.12
50
0.3 x V
CC1
0.7 x V
CC1
-1
+1
54
1.68
72
2.24
ns
V
µA
s
V
µs
ns
ns
kΩ
www.maximintegrated.com
Maxim Integrated │ 3
MAX6715A–MAX6729A/
MAX6797A
Electrical Characteristics (continued)
Dual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
(V
CC1
= 0.8V to 5.5V, V
CC2
= 0.8V to 5.5V, GND = 0V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
=
+25°C.) (Note 1)
PARAMETER
RESET/POWER-FAIL OUTPUTS
V
CC1
or V
CC2
≥ 0.8V, I
SINK
= 1µA,
output asserted
V
CC1
or V
CC2
≥ 1.0V, I
SINK
= 50µA,
output asserted
V
OL
V
CC1
or V
CC2
≥ 1.2V, I
SINK
= 100µA,
output asserted
V
CC1
or V
CC2
≥ 2.7V, I
SINK
= 1.2mA,
output asserted
V
CC1
or V
CC2
≥ 4.5V, I
SINK
= 3.2mA,
output asserted
RST/RST1/PFO
Output High
(Push-Pull Only)
V
CC1
≥ 1.8V, I
SOURCE
= 200µA, output not
asserted
V
CC1
≥ 2.7V, I
SOURCE
= 500µA, output not
asserted
V
CC1
≥ 4.5V, I
SOURCE
= 800µA, output not
asserted
V
CC1
≥ 1.8V, I
SOURCE
= 200µA, output not
asserted
V
CC1
≥ 2.7V, I
SOURCE
= 500µA, output not
asserted
V
CC1
≥ 4.5V, I
SOURCE
= 800µA, output not
asserted
V
CC1
≥ 1.0V, I
SOURCE
= 1µA, reset asserted
RST
Output High
(Push-Pull Only)
V
CC1
≥ 1.8V, I
SOURCE
= 150µA,
reset asserted
V
OH
V
CC1
≥ 2.7V, I
SOURCE
= 500µA,
reset asserted
V
CC1
≥ 4.5V, I
SOURCE
= 800µA,
reset asserted
RST
Output Low
(Push-Pull or Open Drain)
V
CC1
or V
CC2
≥ 1.8V, I
SINK
= 500µA,
reset not asserted
V
OL
V
CC1
or V
CC2
≥ 2.7V, I
SINK
= 1.2mA,
reset not asserted
V
CC1
or V
CC2
≥ 4.5V, I
SINK
= 3.2mA,
reset not asserted
Output not asserted
Output asserted
0.8 x V
CC1
0.8 x V
CC1
0.8 x V
CC1
0.8 x V
CC2
0.8 x V
CC2
0.8 x V
CC2
0.8 x V
CC1
0.8 x V
CC1
0.8 x V
CC1
0.8 x V
CC1
0.3
0.3
0.4
0.5
0.5
µA
µA
V
V
V
V
0.3
0.3
0.3
0.3
0.4
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RST/RST1/RST2/PFO
Output Low
(Push-Pull or Open-Drain)
V
OH
RST2
Output High
(Push-Pull Only)
V
OH
RST/RST1/RST2/PFO
Output
Open-Drain Leakage Current
RST Output Open-Drain
Leakage Current
Note 1:
Devices tested at T
A
= +25°C. Overtemperature limits are guaranteed by design and not production tested.
Note 2:
Parameter guaranteed by design.
www.maximintegrated.com
Maxim Integrated │
4
MAX6715A–MAX6729A/
MAX6797A
Typical Operating Characteristics
Dual/Triple, Ultra-Low-Voltage, SOT23 μP
Supervisory Circuits
(V
CC1
= 5V, V
CC2
= 3.3V, T
A
= +25°C, unless otherwise noted.)
MAX6715A-29A toc01
MAX6715A-29A toc02
18
SUPPLY CURRENT (µA)
16
14
12
10
8
6
4
2
0
TOTAL
I
CC
1
18
SUPPLY CURRENT (µA)
16
14
12
10
8
6
4
2
0
I
CC
2
TOTAL
18
SUPPLY CURRENT (µA)
16
14
12
10
8
6
4
2
0
I
CC
2
TOTAL
I
CC
1
I
CC
1
I
CC
2
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
MAX6715A-29A toc04
MAX6715A-29A toc05
RESET/WATCHDOG TIMEOUT PERIOD
18
SUPPLY CURRENT (µA)
16
14
12
10
8
6
4
2
0
I
CC
2
TOTAL
I
CC
1
1.016
1.012
1.008
1.004
1.000
0.996
0.992
0.988
0.984
0.980
MAXIMUM V
CC
TRANSIENT DURATION (µs)
RESET OCCURS ABOVE
THIS LINE
1000
100
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
10
1
10
100
1000
RESET THRESHOLD OVERDRIVE (mV)
NORMALIZED V
CC
RESET THRESHOLD
vs. TEMPERATURE
MAX6715A-29A toc07
RESET INPUT AND POWER-FAIL INPUT
THRESHOLD vs. TEMPERATURE
MAX6715A-29A toc08
V
CC
TO RESET DELAY
vs. TEMPERATURE
19
V
CC
TO RESET DELAY (µs)
18
17
16
15
14
13
12
11
10
75mV OVERDRIVE
MAX6715A-29A toc09
1.008
1.007
1.006
RESET THRESHOLD
1.005
1.004
1.003
1.002
1.001
1.000
0.999
0.998
638
637
636
RESET THRESHOLD
635
634
633
632
631
630
629
628
20
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
www.maximintegrated.com
Maxim Integrated │
5
MAX6715A-29A toc06
20
SUPPLY CURRENT vs. TEMPERATURE
(V
CC
1 = +1.8V, V
CC
2 = +1.2V)
NORMALIZED/RESET WATCHDOG
TIMEOUT PERIOD vs. TEMPERATURE
1.020
10,000
MAXIMUM V
CC
TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6715A-29A toc03
20
SUPPLY CURRENT vs. TEMPERATURE
(V
CC
1 = +5V, V
CC
2 = +3.3V)
20
SUPPLY CURRENT vs. TEMPERATURE
(V
CC
1 = +3.3V, V
CC
2 = +2.5V)
20
SUPPLY CURRENT vs. TEMPERATURE
(V
CC
1 = +2.5V, V
CC
2 = +1.8V)
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