MAX6710FUT+T [MAXIM]
Power Supply Support Circuit, Adjustable, 4 Channel, BICMOS, PDSO6, LEAD FREE, MO-178AB, SOT-23, 6 PIN;
| 型号： | MAX6710FUT+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Adjustable, 4 Channel, BICMOS, PDSO6, LEAD FREE, MO-178AB, SOT-23, 6 PIN 监控 |
| 文件： | 总9页 (文件大小：198K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2324; Rev 1; 4/02
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
General Description
Features
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.
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
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.
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
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
o Small 6-Pin SOT23 Package
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
(MAX6710) or V is above 2V (MAX6700/MAX6710Q).
CC
MAX6700UT-T
MAX6710_UT-T
The MAX6700/MAX6710 are available in a small 6-pin
SOT23 package and operate over the extended (-40°C to
+85°C) temperature range.
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
Typical Operating Circuit
High-End Printers
Desktop and Notebook Computers
Data Storage Equipment
Networking Equipment
Industrial Equipment
Set-Top Boxes
MAX6700
IN1
MAX6710
SUPPLIES
IN2
TO BE
µP
RESET
MONITORED
IN3
IN4
Servers/Workstations
Selector Guide with Top marks appears at end of data sheet.
Pin Configuration appears at end of data sheet.
GND
________________________________________________________________ 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
ABSOLUTE MAXIMUM RATINGS
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
V
, IN_, RESET to GND..........................................-0.3V to +6V
CC
Continuous RESET Current.................................................20mA
Continuous Power Dissipation
6-Pin SOT23 (derate 8.7mW/°C above +70°C).........695.7mW
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
= 1V to 5.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at V
= 3.0V to 3.3V, T = +25°C.) (Note 1)
IN2 A
IN2
A
PARAMETER
SYMBOL
CONDITIONS
MIN
2.0
1.0
1.2
TYP
MAX
5.5
UNITS
V
MAX6700/MAX6710Q
CC
Operating Voltage Range
(Note 2)
T
T
= 0oC to +85oC
5.5
V
A
V
All others (Note 3)
IN2
= -40oC to +85oC
5.5
A
IN_ = nominal input voltage (for 1.8V, 2.5V,
and 5.0V supplies)
25
55
40
IN2 = nominal input voltage (for 3.0V and
3.3V supplies) (Note 4)
115
0.4
0.2
I
IN_
Input Current
µA
V
V
= 0 to 0.85V (for adjustable thresholds)
IN1
, V
= 0 to 0.85V
IN3 IN4
(for adjustable thresholds)
I
MAX6700/MAX6710Q only, V
= 5.5V
CC
35
50
CC
5V (-5%)
4.50
4.25
3.00
2.85
2.70
2.55
2.25
2.13
1.62
1.53
4.63
4.38
3.08
2.93
2.78
2.63
2.32
2.19
1.67
1.58
4.75
4.50
3.15
3.00
2.85
2.70
2.38
2.25
1.71
1.62
5V (-10%)
3.3V (-5%)
3.3V (-10%)
3.0V (-5%)
3.0V (-10%)
2.5V (-5%)
2.5V (-10%)
1.8V (-5%)
1.8V (-10%)
Threshold Voltage
V
V
IN_ decreasing
IN_ decreasing
V
V
TH
Adjustable Threshold
0.611 0.620 0.629
0.3
TH
Reset Threshold Hysteresis
V
IN_ increasing relative to IN_ decreasing
%V
TH
HYST
Reset Threshold Temperature
Coefficient
TCV
60
ppm/oC
TH
IN_ to Reset Delay
Propagation Delay
Reset Timeout Period
t
V
falling at 10mV/µs from V to (V - 50mV)
30
5
µs
µs
RD
IN
TH
TH
t
t
MAX6700 only
MAX6710 only
PD
RP
140
200
280
ms
2
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
ELECTRICAL CHARACTERISTICS (continued)
(V
= 1V to 5.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at V
= 3.0V to 3.3V, T = +25°C.) (Note 1)
IN2 A
IN2
A
PARAMETER
SYMBOL
CONDITIONS
= 5V, I = 2mA
MIN
TYP
MAX
0.3
UNITS
V
V
V
, V
IN2 CC
SINK
RESET Output Low
RESET Output High
V
V
, V
IN2 CC
= 2.5V, I
= 1.2mA
SINK
0.4
OL
= 1.0V, I
= 50µA, T = 0oC to +85oC
0.3
IN2
SINK
A
V
≥ 2.0V, I
= 6µA, RESET
CC
SOURCE
0.8 ✕ V
0.8 ✕ V
CC
deasserted (MAX6700/MAX6710Q)
V
V
OH
V
≥ 2.0V, I = 6µA, RESET
IN2
SOURCE
IN2
deasserted
RESET Output High Source
Current
I
V
≥ 2.0V, RESET deasserted
10
µA
OH
IN2
Note 1: 100% production tested at T = +25°C. Limits over temperature guaranteed by design.
A
Note 2: The devices are powered from IN2 or V
(for MAX6700/MAX6710Q).
CC
Note 3: The RESET output is guaranteed to be in the correct state for IN1 or IN2 down to 1V.
Note 4: 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
= V
= 3.0V, T = +25°C)
A
CC
IN2
NORMALIZED THRESHOLD ERROR
vs. TEMPERATURE
IN2 INPUT CURRENT vs. TEMPERATURE
IN2 INPUT CURRENT vs. IN2 VOLTAGE
60
58
56
54
52
50
48
46
44
42
40
0.10
0.08
0.06
0.04
0.02
0
90
80
70
60
50
40
30
20
10
0
V
= 3.3V
IN2
V
V
= 3.3V
= 3V
IN2
V
TH
= 1.8V
-0.02
-0.04
-0.06
-0.08
-0.10
IN2
-40
-15
10
35
60
85
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
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
Typical Operating Characteristics (continued)
(V
= V
= 3.0V, T = +25°C)
A
CC
IN2
MAXIMUM IN_ TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
RESET DELAY vs. RESET THRESHOLD
OVERDRIVE (IN_ DECREASING)
RESET PULLUP AND PULLDOWN
RESPONSE (C = 47pF)
L
MAX6700 toc06
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
IN_
100mV/div
AC-COUPLED
RESET ASSERTED
ABOVE THIS LINE
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
RESET TIMEOUT DELAY (MAX6710)
RESET PROPAGATION DELAY (MAX6700)
MAX6700 toc09
MAX6700 toc08
232
231
230
229
228
227
226
225
224
223
222
221
220
IN_
2V/div
IN_
2V/div
RESET
2V/div
RESET
2V/div
-40
-15
10
35
60
85
40ms/div
2µs/div
TEMPERATURE (°C)
Pin Description
PIN
NAME
FUNCTION
1
IN1
IN2
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 is the power-supply input for the device and is not a monitored voltage.
2
V
CC
CC
3
4
5
IN3
Input Voltage 3. See Selector Guide for monitored voltages.
Input Voltage 4. See Selector Guide for monitored voltages.
Ground
IN4
GND
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)
6
RESET
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
V
CC
V
CC
V
CC
V
CC
IN1
IN3
IN4
MAX6700
V
CC
RESET
UVLO
0.62V
REFERENCE
Figure 1. MAX6700 Functional Diagram
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
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.
a separate unmonitored power-supply input (V ) and
CC
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.
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
_______________________________________________________________________________________
5
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
ALL DEVICES ARE POWERED FROM IN2, V (3.0V/3.3V). RESET IS VALID IF V OR V IS GREATER THAN 1V, OR IF V IS GREATER THAN 2V (MAX6710Q ONLY)
CC
IN1
IN2
CC
IN1
(ADJ)
MAX6710
IN2, V
CC
(3.3V/3V)
IN2, V
CC
RESET
TIME-
OUT
NOR
GATE
(200ms)
IN3
(2.5V/1.8V)
UVLO
IN4
(ADJ)
0.62V
REFERENCE
Figure 2. MAX6710 Functional Diagram
weak internal pullup to the monitored IN2 or V
supply
CC
Applications Information
(10µA typ). 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
can overdrive the internal pullup if interfacing to differ-
ent logic-supply voltages (Figure 4). Internal circuitry
prevents reverse current flow from the external pullup
voltage to IN2.
Reset Output
The MAX6700 RESET output asserts low when any
monitored IN_ voltage drops below its specified reset
threshold and remains low for the propagation delay
(5µs) after all inputs exceed their thresholds (Figure 3).
The MAX6710 provides an extended reset timeout peri-
od of 140ms (min). The output is open drain with a
6
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
V
powers the MAX6700/MAX6710Q and is not a
CC
IN_
TH_
monitored voltage. IN2 powers all other options for the
MAX6710 and is a monitored voltage. When any supply
drops below its threshold, the reset output asserts low
and remains low while either IN1 or IN2 is above 1.0V.
V
V
TH_
Adjustable Thresholds
The MAX6700/MAX6710 offer several monitor options
with adjustable reset thresholds. The threshold voltage at
each adjustable IN_ input is typically 0.62V. To monitor a
voltage >0.62V, connect a resistor-divider network to the
circuit as shown in Figure 5.
RESET
90%
10%
t
RP
t
RD
Figure 3. RESET Output Timing Diagram
V
INTH
= 0.62V x (R1 + R2) / R2
or, solved in terms of R1:
R1 = R2 ((V
IN2 = +3.3V
+5V
/ 0.62V) - 1)
INTH
Because the MAX6700/MAX6710 have a guaranteed
input current of 0.2µA ( 0.4µA for IN1) on their
adjustable inputs, resistor values up to 100kΩ can be
used for R2 with <1% error. The MAX6700/MAX6710Q
include an internal voltage clamp (1.5V typ) at each of
the adjustable voltage inputs. An input voltage higher
than 1.5V induces a higher input current.
100kΩ
IN2
V
CC
RESET
RESET
Unused Inputs
Connect unused monitor inputs to a supply voltage
greater in magnitude than their specified threshold volt-
ages. For unused IN_ adjustable inputs, connect a 1MΩ
series resistor between the unused input and IN2 (or
MAX6700
MAX6710
GND
GND
V
) to limit the bias current. Use IN2 for normal opera-
CC
tion (device power-supply pin). Do not connect unused
monitor inputs to ground or allow them to float.
Figure 4. Interfacing to Different Logic-Supply Voltage
Adding Manual Reset Capability
(MAX6710)
V
INTH
Figure 6 shows an application circuit adding manual reset
to the MAX6710. Depressing the pushbutton switch short-
circuits the analog input to ground and initiates a RESET
pulse. The switch must be open for at least 140ms in
order to deassert the RESET output. No external switch
debounce is required. Use a small capacitor to improve
noise immunity when using long leads from the pushbut-
ton switch to the adjustable input.
R1
R2
Power-Supply Bypassing and Grounding
The MAX6700/MAX6710 are normally powered from the
V
= 0.62V
REF
monitored IN2 or from the V supply input. All monitored
CC
V
INTH
0.62V
R1 = R2
- 1
)
inputs are immune to short supply transients. For higher
immunity in noisy applications, connect a 0.1µF bypass
capacitor from the IN2 input to ground. Add capacitance
to IN1, IN3, and IN4 to increase their noise immunity.
(
Figure 5. Setting the Auxiliary Monitor
_______________________________________________________________________________________
7
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
Pin Configuration
IN1
TOP VIEW
IN2
IN3
MAX6710
IN1
1
2
3
6
5
4
RESET
GND
IN4
RESET
R1
IN4
MAX6700
MAX6710
(ADJUSTABLE
INPUT)
(V ) IN2
CC
R2
IN3
GND
SOT23
( ) ARE FOR MAX6700/MAX6710Q ONLY
Figure 6. Adding Manual Reset Capability
Chip Information
Selector Guide
TRANSISTOR COUNT: 699
PROCESS: BiCMOS
NOMINAL INPUT VOLTAGE
SUPPLY
TOP
PART**
(SUFFIX IN BOLD)
TOLERANCE
MARK
IN1
(V)
IN2
(V)
IN3
(V)
IN4
(V)
(%)
MAX6700UT
MAX6710AUT
MAX6710BUT
MAX6710CUT
MAX6710DUT
MAX6710EUT
MAX6710FUT
MAX6710GUT
MAX6710HUT
MAX6710IUT
MAX6710JUT
MAX6710KUT
MAX6710LUT
MAX6710MUT
MAX6710NUT
MAX6710OUT
MAX6710PUT
MAX6710QUT
Adj*
5
V
Adj*
2.5
2.5
1.8
1.8
2.5
2.5
Adj*
Adj*
2.5
2.5
1.8
1.8
2.5
2.5
1.8
1.8
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
1.8
N/A
10
5
ABEK
AAZA
AAZB
AAZC
AAZD
AAZE
AAZF
AAZG
AAZH
AAZI
CC
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3
5
5
10
5
5
Adj*
Adj*
5
10
5
1.8
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
10
5
5
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
10
5
AAZJ
AAZK
AAZL
AAZM
AAZN
AAZO
AAZP
AAZQ
10
5
10
5
3
3
10
5
3
V
N/A
CC
*Adjustable voltage based on 0.62V internal threshold. External threshold voltage can be set using an external resistor-divider.
**The MAX6700 acts as a voltage detector with a 5µs propagation delay. The MAX6710 serves as a microprocessor reset circuit with a
140ms (min) reset timeout.
8
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Triple/Quad
Voltage µP Supervisory Circuits in SOT Package
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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