MAX6710GUT [MAXIM]
Analog IC ; 模拟IC\n
| 型号： | MAX6710GUT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Analog IC
|
| 文件： | 总9页 (文件大小：168K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2324; Rev 0; 1/02
Low-Voltage, High-Accuracy, Quad-Voltage
µP Supervisory Circuit in SOT Package
General Description
Features
The MAX6710 precision quad-voltage monitor with micro-
processor (µP) supervisory reset timing monitors up to
four system-supply voltages and asserts a single reset if
any supply voltage drops below its preset threshold. The
device significantly reduces system size and component
count while improving reliability compared to separate
ICs or discrete components.
o Monitors 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 selection includes internally fixed options for monitor-
ing 5.0V, 3.3V, 3.0V, 2.5V, and 1.8V supplies with -5% or
-10% tolerances. The device is also available with one to
three adjustable threshold options to monitor voltages
down to 0.62V.
o Open-Drain RESET Output with 10µA Internal
Pullup
o 140ms (min) Reset Timeout Period
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
A single active-low reset output asserts when any moni-
tored input is below its associated threshold. The output
is open drain with a weak internal pullup (10µA) to IN2.
Reset remains low for a reset timeout period (140ms min)
after all voltages are above the selected thresholds. The
output is valid as long as either the IN1 or IN2 input volt-
age remains >1V.
Ordering Information
The MAX6710 is available in a small 6-pin SOT23 pack-
age and operates over the extended (-40°C to +85°C)
temperature range.
PART
TEMP RANGE
PIN-PACKAGE
MAX6710_UT-T*
-40 C to +85 C
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 and
these devices are available in tape-and-reel only.
________________________Applications
Telecommunications
High-End Printers
Desktop and Network Computers
Data Storage Equipment
Networking Equipment
Industrial Equipment
Set-Top Boxes
Typical Operating Circuit
MAX6710
IN1
SUPPLIES
IN2
TO BE
µP
RESET
MONITORED
IN3
IN4
GND
Selector Guide appears at end of data sheet.
Pin Configuration appears at end of data sheet.
________________________________________________________________ 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, Quad-Voltage
µP Supervisory Circuit in SOT Package
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
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
Input Voltages (IN_ ).................................................-0.3V to +6V
RESET.......................................................................-0.3V to +6V
Continuous RESET Current.................................................20mA
Continuous Power Dissipation (T = +70°C)
A
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
MAX6710Q
All others
CC
Operating Voltage Range
(Notes 2, 3)
T
T
= 0oC to +85oC
= -40oC to +85oC
5.5
V
A
A
V
IN2
5.5
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
MAX6710Q only, V
IN_ decreasing
IN_ decreasing
= 5.5V
35
50
CC
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
V
V
TH
Adjustable Threshold
0.611 0.620 0.624
0.3
TH
Reset Threshold Hysteresis
V
IN_ increasing relative to IN_ decreasing
%V
TH
HYST
Reset Threshold Temperature
Coefficient
TCV
60
30
ppm/oC
TH
IN_ to Reset Delay
t
V
IN_
falling at 10mV/µs from V to (V - 50mV)
µs
RD
TH
TH
Reset Timeout Period
t
RP
140
200
280
ms
2
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Quad-Voltage
µP Supervisory Circuit 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
IN2 CC
= 2.5V, I
= 1.2mA
SINK
0.4
V
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 (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 device is powered from input IN2 or V
(for 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
IN2
= 3.0V, T = +25°C)
A
NORMALIZED THRESHOLD ERROR
vs. TEMPERATURE
IN2 INPUT CURRENT vs. TEMPERATURE
IN2 INPUT CURRENT vs. IN2 VOLTAGE
0.10
0.08
0.06
0.04
0.02
0
60
58
56
54
52
50
48
46
44
42
40
90
80
70
60
50
40
30
20
10
0
V
= 3.3V
IN2
V
V
= 3.3V
= 3V
IN2
V
= 1.8V
TH
-0.02
-0.04
-0.06
-0.08
-0.10
IN2
-40
-15
10
35
60
85
-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)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Low-Voltage, High-Accuracy, Quad-Voltage
µP Supervisory Circuit in SOT Package
Typical Operating Characteristics (continued)
(V
= 3.0V, T = +25°C)
A
IN2
RESET PULLUP AND PULLDOWN
MAXIMUM IN_ TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
RESET DELAY vs. RESET THRESHOLD
OVERDRIVE (IN_ DECREASING)
RESPONSE (C = 47pF)
L
MAX6710 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
10µs/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)
RESET TIMEOUT DELAY
vs. TEMPERATURE
RESET TIMEOUT DELAY
MAX6710 toc08
232
231
230
229
228
227
226
225
224
223
222
221
220
IN_
2V/div
RESET
2V/div
40ms/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
Pin Description
PIN
NAME
IN1
FUNCTION
1
Input Voltage 1. See Selector Guide for monitored voltages.
IN2
Input Voltage 2. See Selector Guide for monitored voltages. IN2 is the power-supply input for the
device. V is the power-supply input for the device and is not a monitored voltage (MAX6710Q only).
CC
2
V
CC
3
4
5
IN3
IN4
Input Voltage 3. See Selector Guide for monitored voltages.
Input Voltage 4. See Selector Guide for monitored voltages.
Ground
GND
Reset Output, Active Low. RESET goes low when any input goes below its specified threshold. After
all inputs are above their threshold voltage, RESET remains low for at least 140ms (minimum) before
6
RESET
going high. RESET output is open-drain with a weak internal pullup to IN2, V
.
CC
4
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Quad-Voltage
µP Supervisory Circuit 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 1. MAX6710 Functional Diagram
munications, desktop and notebook computers, high-
end printers, data storage equipment, and networking
equipment applications.
Detailed Description
The MAX6710 is a very small, low-power, quad-voltage
µP supervisory circuit designed to maintain system
integrity in multisupply systems (Figure 1). The device
offers several internally trimmed undervoltage threshold
options that minimize the need for external compo-
nents. Preset voltage monitoring options for 5.0V, 3.3V,
3.0V, 2.5V, and 1.8V make the device ideal for telecom-
The quad-voltage reset includes an accurate bandgap
reference, four precision comparators, and a series of
internally trimmed resistor-divider networks to set the fac-
tory-fixed reset threshold options. The resistor networks
scale the specified IN_ reset voltages to match the inter-
_______________________________________________________________________________________
5
Low-Voltage, High-Accuracy, Quad-Voltage
µP Supervisory Circuit in SOT Package
nal bandgap reference/comparator voltage. Adjustable
threshold options bypass the internal resistor networks
IN_
TH_
V
V
TH_
and connect directly to one of the comparator inputs (an
external resistor-divider network is required for threshold
matching). The MAX6710Q provides a separate unmoni-
tored power-supply input (V ) and three adjustable volt-
CC
age inputs.
RESET
90%
Each of the internal comparators has a typical hystere-
sis 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 when an input sits at its specified reset volt-
age. The MAX6710 is also designed to ignore short IN_
transients. See Typical Operating Characteristics for a
glitch immunity graph.
10%
t
t
RP
RD
Figure 2. RESET Output Timing Diagram
IN2 = +3.3V
+5V
Applications Information
Reset Output
The MAX6710 RESET output asserts low when any
monitored IN_ voltage drops below its specified reset
threshold and remains low for the reset timeout period
(140ms minimum) after all inputs exceed their thresh-
olds (Figure 2). The output is open drain with a weak
100kΩ
IN2
V
CC
RESET
RESET
internal pullup to the monitored IN2 or V
supply
CC
(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 3). Internal circuitry
prevents reverse current flow from the external pullup
voltage to IN2.
MAX6710
GND
GND
The MAX6710 is normally powered from the monitored
IN2 supply when all input voltages are above their
specified thresholds. When any supply drops below its
threshold, the reset output is asserted and guaranteed
to remain low while either IN1 or IN2 is above 1.0V.
Figure 3. Interfacing to Different Logic-Supply Voltage
V
INTH
Adjustable Thresholds
The MAX6710 offers 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 4.
R1
R2
V
INTH
= 0.62V x (R1 + R2) / R2
V
= 0.62V
REF
V
INTH
0.62V
R1 = R2
- 1
or, solved in terms of R1:
R1 = R2 ((V
(
)
Figure 4. Setting the Auxiliary Monitor
/ 0.62V) - 1)
INTH
6
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Quad-Voltage
µP Supervisory Circuit in SOT Package
always be used for normal operation (device power-
supply pin). Unused monitor inputs cannot be connect-
IN1
ed to ground or allowed to float.
IN2
MAX6710
IN3
Adding Manual Reset Capability
Figure 5 shows an application circuit adding manual
RESET
R1
reset to the MAX6710 quad-voltage supervisor.
Depressing the pushbutton switch short-circuits the ana-
log input to ground and initiates a RESET pulse. The
switch must be open for 200ms (typ) in order to deassert
the RESET output. No external switch debounce is
required. Use a small capacitor to improve noise immuni-
ty when using long leads from the pushbutton switch to
the adjustable input.
IN4
(ADJUSTABLE
INPUT)
R2
GND
Figure 5. Adding Manual Reset Capability
Power-Supply Bypassing and Grounding
The MAX6710 is normally powered from the monitored
IN2 or from the V
supply input. All monitored inputs
CC
Because the MAX6710 has a guaranteed input current
of 0.2µA ( 0.4µA for IN1) on its adjustable inputs,
resistor values up to 100kΩ can be used for R2 with
<1% error. The MAX6710Q includes 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.
are immune to short supply transients. If higher immuni-
ty is desired in noisy applications, connect a 0.1µF
bypass capacitor from the IN2 input to ground.
Additionally, capacitance can be added to IN1, IN3,
and IN4 to increase their noise immunity.
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
Chip Information
TRANSISTOR COUNT: 699
PROCESS: BiCMOS
(or V ) to limit the bias current. The IN2 input must
CC
Pin Configuration
TOP VIEW
IN1
1
2
3
6
5
4
RESET
GND
IN4
MAX6710
(V ) IN2
CC
IN3
SOT23
( ) ARE FOR MAX6710Q ONLY
_______________________________________________________________________________________
7
Low-Voltage, High-Accuracy, Quad-Voltage
µP Supervisory Circuit in SOT Package
Selector Guide
NOMINAL INPUT VOLTAGE
SUPPLY
TOLERANCE
(%)
TOP
MARK
PART
(SUFFIX IN BOLD)
IN1
(V)
IN2
(V)
IN3
(V)
IN4
(V)
MAX6710AUT
MAX6710BUT
MAX6710CUT
MAX6710DUT
MAX6710EUT
MAX6710FUT
MAX6710GUT
MAX6710HUT
MAX6710IUT
MAX6710JUT
MAX6710KUT
MAX6710LUT
MAX6710MUT
MAX6710NUT
MAX6710OUT
MAX6710PUT
MAX6710QUT
5
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
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*
1.8
10
5
AAZA
AAZB
AAZC
AAZD
AAZE
AAZF
AAZG
AAZH
AAZI
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.
8
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Quad-Voltage
µP Supervisory Circuit in SOT Package
Package Information
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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