19-2324; Rev 1; 4/02
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
General Description
The MAX6700/MAX6710 precision triple/quad voltage
microprocessor (µP) supervisory circuits monitor up to
four system-supply voltages and assert a single reset if
any supply voltage drops below its preset threshold.
These devices significantly reduce system size and com-
ponent count while improving reliability compared to sep-
arate ICs or discrete components.
A variety of factory-trimmed threshold voltages are avail-
able to accommodate different supply voltages and toler-
ances with minimal external component requirements.
The MAX6710 includes internally fixed options for moni-
toring 5.0V, 3.3V, 3.0V, 2.5V, and 1.8V supplies with -5%
or -10% tolerances. The MAX6710 is also available with
one to three adjustable threshold options to monitor volt-
ages down to 0.62V. The MAX6700 monitors three volt-
ages with adjustable thresholds down to 0.62V.
A single active-low output asserts when any monitored
input falls below its associated threshold. The open-drain
output has a weak internal pullup (10µA) to IN2. For the
MAX6710, reset remains low for the reset timeout period
(140ms min) after all voltages rise above the selected
threshold. The MAX6700 acts as a voltage detector with a
propagation delay of 5µs after all monitored voltages
exceed their thresholds. The output remains valid as long
as either IN2 or IN2 input voltage remains above 1V
(MAX6710) or V
CC
is above 2V (MAX6700/MAX6710Q).
The MAX6700/MAX6710 are available in a small 6-pin
SOT23 package and operate over the extended (-40°C to
+85°C) temperature range.
Features
o
Monitor Up to Four Power-Supply Voltages
o
Precision Factory-Set Reset Threshold Options
for 5.0V, 3.3V, 3.0V, 2.5V, and 1.8V Supplies
o
Adjustable Voltage Threshold Monitors Down to
0.62V with 1.5% Accuracy
o
Low 35µA Supply Current
o
Open-Drain
RESET
Output with 10µA Internal
Pullup
o
5µs Propagation Delay (MAX6700)
o
140ms (min) Reset Timeout Period (MAX6710)
o
RESET
Valid to IN1 = 1V or IN2 = 1V
o
Immune to Short Monitored Supply Transients
o
Guaranteed from -40°C to +85°C
o
Small 6-Pin SOT23 Package
MAX6700/MAX6710
Ordering Information
PART
MAX6700UT-T
MAX6710_UT-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
Insert the desired suffix letter from the Selector Guide into the
blank to complete the part number. There is a 2500 piece mini-
mum order increment requirement on the SOT package. These
devices are available in tape-and-reel only.
________________________Applications
Telecommunications
High-End Printers
Desktop and Notebook Computers
Data Storage Equipment
Networking Equipment
Industrial Equipment
Set-Top Boxes
Servers/Workstations
Selector Guide with Top marks appears at end of data sheet.
Pin Configuration appears at end of data sheet.
SUPPLIES
TO BE
MONITORED
IN1
IN2
IN3
IN4
GND
Typical Operating Circuit
MAX6700
MAX6710
RESET
µP
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
MAX6700/MAX6710
ABSOLUTE MAXIMUM RATINGS
V
CC
, IN_,
RESET
to GND..........................................-0.3V to +6V
Continuous
RESET
Current .................................................20mA
Continuous Power Dissipation
6-Pin SOT23 (derate 8.7mW/°C above +70°C).........695.7mW
Operating Temperature Range ...........................-40°C to +85°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
IN2
= 1V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
IN2
= 3.0V to 3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
(Note 2)
SYMBOL
V
CC
V
IN2
CONDITIONS
MAX6700/MAX6710Q
All others (Note 3)
T
A
= 0 C to +85 C
T
A
= -40 C to +85 C
o
o
o
o
MIN
2.0
1.0
1.2
TYP
MAX
5.5
5.5
5.5
UNITS
V
IN_ = nominal input voltage (for 1.8V, 2.5V,
and 5.0V supplies)
I
IN_
IN2 = nominal input voltage (for 3.0V and
3.3V supplies) (Note 4)
V
IN1
= 0 to 0.85V (for adjustable thresholds)
V
IN3
, V
IN4
= 0 to 0.85V
(for adjustable thresholds)
I
CC
MAX6700/MAX6710Q only, V
CC
= 5.5V
5V (-5%)
5V (-10%)
3.3V (-5%)
3.3V (-10%)
Threshold Voltage
V
TH
IN_ decreasing
3.0V (-5%)
3.0V (-10%)
2.5V (-5%)
2.5V (-10%)
1.8V (-5%)
1.8V (-10%)
Adjustable Threshold
Reset Threshold Hysteresis
Reset Threshold Temperature
Coefficient
IN_ to Reset Delay
Propagation Delay
Reset Timeout Period
V
TH
V
HYST
TCV
TH
t
RD
t
PD
t
RP
V
IN
falling at 10mV/µs from V
TH
to (V
TH
- 50mV)
MAX6700 only
MAX6710 only
140
IN_ decreasing
IN_ increasing relative to IN_ decreasing
4.50
4.25
3.00
2.85
2.70
2.55
2.25
2.13
1.62
1.53
0.611
25
55
40
115
µA
0.4
0.2
Input Current
35
4.63
4.38
3.08
2.93
2.78
2.63
2.32
2.19
1.67
1.58
0.620
0.3
60
30
5
200
50
4.75
4.50
3.15
3.00
2.85
2.70
2.38
2.25
1.71
1.62
0.629
V
%V
TH
ppm/
o
C
µs
µs
280
ms
V
2
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
ELECTRICAL CHARACTERISTICS (continued)
(V
IN2
= 1V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
IN2
= 3.0V to 3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
RESET
Output Low
SYMBOL
V
OL
CONDITIONS
V
IN2
, V
CC
= 5V, I
SINK
= 2mA
V
IN2
, V
CC
= 2.5V, I
SINK
= 1.2mA
V
IN2
= 1.0V, I
SINK
= 50µA, T
A
= 0 C to +85 C
V
CC
≥
2.0V, I
SOURCE
= 6µA,
RESET
deasserted (MAX6700/MAX6710Q)
V
OH
V
IN2
≥
2.0V, I
SOURCE
= 6µA,
RESET
deasserted
V
IN2
≥
2.0V,
RESET
deasserted
0.8
✕
V
CC
V
0.8
✕
V
IN2
10
µA
o
o
MAX6700/MAX6710
MIN
TYP
MAX
0.3
0.4
0.3
UNITS
V
RESET
Output High
RESET
Output High Source
Current
I
OH
Note 1:
Note 2:
Note 3:
Note 4:
100% production tested at T
A
= +25°C. Limits over temperature guaranteed by design.
The devices are powered from IN2 or V
CC
(for MAX6700/MAX6710Q).
The
RESET
output is guaranteed to be in the correct state for IN1 or IN2 down to 1V.
Monitored IN2 voltage (3.3V, 3.0V) is also the device power supply. Supply current splits as follows: 25µA for the resistor
divider (for the monitored voltage) and 30µA for other circuits.
Typical Operating Characteristics
(V
IN2
= V
CC
= 3.0V, T
A
= +25°C)
NORMALIZED THRESHOLD ERROR
vs. TEMPERATURE
MAX6700 toc02
IN2 INPUT CURRENT vs. TEMPERATURE
MAX6700 toc01
IN2 INPUT CURRENT vs. IN2 VOLTAGE
90
80
IN2 INPUT CURRENT (µA)
70
60
50
40
30
20
10
0
0.10
0.08
NORMALIZED THRESHOLD ERROR (%)
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
IN2 VOLTAGE (V)
-40
58
56
IN2 INPUT CURRENT (µA)
54
52
50
48
46
44
42
40
-40
-15
10
35
60
V
IN2
= 3V
V
IN2
= 3.3V
V
IN2
= 3.3V
V
TH
= 1.8V
85
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
MAX6700 toc03
60
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
MAX6700/MAX6710
Typical Operating Characteristics (continued)
(V
IN2
= V
CC
= 3.0V, T
A
= +25°C)
MAXIMUM IN_ TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6700 toc04
RESET DELAY vs. RESET THRESHOLD
OVERDRIVE (IN_ DECREASING)
90
80
70
RESET DELAY (µs)
60
50
40
30
20
10
0
MAX6700 toc05
RESET PULLUP AND PULLDOWN
RESPONSE (C
L
= 47pF)
100
MAXIMUM IN_ TRANSIENT DURATION (µs)
90
80
70
60
50
40
30
20
10
0
RESET ASSERTED
ABOVE THIS LINE
100
MAX6700 toc06
IN_
100mV/div
AC-COUPLED
RESET
2V/div
0 100 200 300 400 500 600 700 800 900 1000
RESET THRESHOLD OVERDRIVE (mV)
0 100 200 300 400 500 600 700 800 900 1000
RESET THRESHOLD OVERDRIVE (mV)
10µs/div
RESET TIMEOUT DELAY
vs. TEMPERATURE
232
231
230
229
228
227
226
225
224
223
222
221
220
-40
-15
10
35
60
TEMPERATURE (°C)
MAX6700 toc07
RESET PROPAGATION DELAY (MAX6700)
MAX6700 toc08
RESET TIMEOUT DELAY (MAX6710)
MAX6700 toc09
RESET TIMEOUT DELAY (ms)
IN_
2V/div
IN_
2V/div
RESET
2V/div
RESET
2V/div
85
2µs/div
40ms/div
Pin Description
PIN
1
2
3
4
5
6
NAME
IN1
IN2
V
CC
IN3
IN4
GND
RESET
FUNCTION
Input Voltage 1. See
Selector Guide
for monitored voltages.
Input Voltage 2. See
Selector Guide
for monitored voltages. IN2 is the power-supply input for the device.
For the MAX6700/MAX6710Q, V
CC
is the power-supply input for the device and is not a monitored voltage.
Input Voltage 3. See
Selector Guide
for monitored voltages.
Input Voltage 4. See
Selector Guide
for monitored voltages.
Ground
Active-Low, Reset Output.
RESET
goes low when any input goes below its specified threshold. After all
inputs rise above their threshold voltage,
RESET
remains low for 5µs (MAX6700) or for 200ms (MAX6710)
before going high. The open-drain
RESET
output has a weak (10µA) internal pullup to IN2 or V
CC
.
4
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
MAX6700/MAX6710
V
CC
V
CC
IN1
MAX6700
V
CC
V
CC
IN3
RESET
UVLO
V
CC
IN4
0.62V
REFERENCE
Figure 1. MAX6700 Functional Diagram
Detailed Description
The MAX6700/MAX6710 are very small, low-power,
triple/quad voltage µP supervisory circuits designed to
maintain system integrity in multisupply systems
(Figures 1 and 2). The MAX6710 offers several internally
trimmed undervoltage threshold options for monitoring
5.0V, 3.3V, 3.0V, 2.5V, and 1.8V supplies. The
MAX6700/MAX6710 offer one to three adjustable thresh-
olds for monitoring voltages down to 0.62V.
The triple/quad voltage monitors include an accurate
bandgap reference, precision comparators, and a series
of internally trimmed resistor-divider networks to set the
factory-fixed reset threshold options. The resistor net-
works scale the specified IN_ reset voltages to match the
internal bandgap reference/comparator voltage.
Adjustable threshold options bypass the internal resistor
networks and connect directly to one of the comparator
inputs (use an external resistor-divider network for
threshold matching). The MAX6700/MAX6710Q provide
a separate unmonitored power-supply input (V
CC
) and
three adjustable voltage inputs.
Each of the internal comparators has a typical hysteresis
of 0.3% with respect to its reset threshold. This built-in
hysteresis improves the monitor’s immunity to ambient
noise without significantly reducing threshold accuracy.
The MAX6700/MAX6710 are immune to short IN_ tran-
sients. See
Typical Operating Characteristics
for a glitch
immunity graph.
_______________________________________________________________________________________
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