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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX706T Datasheet

Low-Cost uP Supervisory Circuits

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19-0099; Rev 5; 4/06
+3V Voltage Monitoring, Low-Cost µP
Supervisory Circuits
General Description
The MAX706P/R/S/T, MAX706AP/AR/AS/AT, and
MAX708R/S/T microprocessor (µP) supervisory circuits
reduce the complexity and number of components
required to monitor +3V power-supply levels in +3V to
+5V µP systems. These devices significantly improve
system reliability and accuracy compared to separate
ICs or discrete components.
The MAX706P/R/S/T and MAX706AP/AR/AS/AT supervi-
sory circuits provide the following four functions:
1) A reset output during power-up, power-down, and
brownout conditions.
2) An independent watchdog output that goes low if the
watchdog input has not been toggled within 1.6s.
3) A 1.25V threshold detector for power-fail warning,
low-battery detection, or for monitoring a power
supply other than the main supply.
4) An active-low, manual-reset input.
The only difference between the MAX706R/AR,
MAX706S/AS, and MAX706T/AT is the reset-threshold
voltage levels, which are 2.63V, 2.93V, and 3.08V,
respectively. All have active-low reset output signals.
The MAX706P/AP are identical to the MAX706R/AR,
except the reset output signal is active-high. The watch-
dog timer function for the MAX706AP/AR/AS/AT dis-
ables when the WDI input is left open or connected to a
high-impedance state of a low-leakage tri-state output.
The MAX708R/S/T provide the same functions as the
MAX706R/S/T and MAX706AR/AS/AT except they do
not have a watchdog timer. Instead, they provide both
RESET and RESET outputs. As with the MAX706,
devices with R, S, and T suffixes have reset thresholds
of 2.63V, 2.93V, and 3.08V, respectively.
These devices are available in 8-pin SO, DIP, and
µMAX® packages and are fully specified over the oper-
ating temperature range.
Applications
Battery-Powered Equipment
Portable Instruments
Computers
Controllers
Intelligent Instruments
Critical µP Power Monitoring
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Features
o µMAX Package, Small 8-Pin SO
o Precision Supply-Voltage Monitors
2.63V (MAX706P/R, MAX706AP/AR, and MAX708R)
2.93V (MAX706S, MAX706AS, and MAX708S)
3.08V (MAX706T, MAX706AT, and MAX708T)
o 200ms Reset Time Delay
o Debounced TTL/CMOS-Compatible Manual Reset
Input
o 100µA Quiescent Current
o WDI Disable Feature (MAX706AP/AR/AS/AT)
o Watchdog Timer: 1.6s Timeout
o Reset Output Signal:
Active-High Only (MAX706P, MAX706AP)
Active-Low Only (MAX706R/S/T, MAX706AR/AS/AT)
Active-High and Active-Low (MAX708R/S/T)
o Voltage Monitor for Power-Fail or Low-Battery
Warning
o 8-Pin Surface-Mount Package
o Guaranteed RESET Assertion to VCC = 1V
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
PKG
CODE
MAX706PCPA 0°C to +70°C 8 PDIP
P8-1
MAX706PCSA
MAX706PCUA
0°C to +70°C
0°C to +70°C
8 SO
8 µMAX
S8-2
U8-1
MAX706PEPA -40°C to +85°C 8 PDIP
P8-1
SO, µMAX, and PDIP packages are available in lead-free.
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Typical Operating Circuits
UNREGULATED
DC
MAX639
DC-DC
CONVERTER
+3V/+3.3V
VCC
PUSHBUTTON
SWITCH
MAX706R/S/T
MAX706AR/AS/AT
VCC RESET
PFI WDI
MR WDO
GND PFO
µP
RESET
I/O LINE
NMI
INTERRUPT
Typical Operating Circuits continued 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX706T Datasheet

Low-Cost uP Supervisory Circuits

No Preview Available !

+3V Voltage Monitoring, Low-Cost µP
Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
VCC ........................................................................-0.3V to +6V
All Other Inputs (Note 1)..........................-0.3V to (VCC + 0.3V)
Input Current
VCC ..................................................................................20mA
GND .................................................................................20mA
Output Current (all outputs) ................................................20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin CERDIP (derate 8mW/°C above +70°C)..............640mW
8-Pin PDIP (derate 9.1mW/°C above +70°C).............727.3mW
8-Pin SO (derate 5.9mW/°C above +70°C)................470.6mW
8-Pin µMAX (derate 4.5mW/oC above +70°C) ..............362mW
Operating Temperature Range
MAX70_C .............................................................0°C to +70°C
MAX70_E ..........................................................-40°C to +85°C
MAX70_M .......................................................-55°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: The input-voltage limits on PFI, WDI, and MR can be exceeded if the input current is less than 10mA.
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
(MAX70_P/R, MAX706AP/AR: VCC = 2.7V to 5.5V; MAX70_S, MAX706AS: VCC = 3.0V to 5.5V; MAX70_T, MAX706AT: VCC = 3.15V to
5.5V; TJ = TA = TMIN to TMAX, unless otherwise noted. Typical values are at TJ = TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage Range
VCC
MAX70_C
MAX70_E/M
MAX706_C
1.0 5.5
1.2 5.5
90 200
V
Supply Current
VCC < 3.6V
ISUPPLY
MAX706_E/M
MAX708_C
MAX708_E/M
MAX706_C
90 300
50 200
50 300
135 350
µA
VCC < 5.5V
MAX706_E/M
MAX708_C
135 500
65 350
Reset Threshold (Note 3)
(VCC Falling)
VRST
MAX708_E/M
MAX70_P/R, MAX706AP/AR
MAX70_S, MAX706AS
MAX70_T, MAX706AT
2.55
2.85
3.00
65
2.63
2.93
3.08
500
2.70
3.00
3.15
V
Reset Threshold Hysteresis
(Note 3)
VHYS
20 mV
Reset Pulse Width (Note 3)
RESET OUTPUT
MAX70_P/R, MAX706AP/AR VCC = 3.0V
tRST MAX70_S, MAX706AS, VCC = 3.3V
VCC = 5V
140 200 280
140 200 280
200
ms
Output-Voltage High
(MAX70_R/S/T)
(MAX706AR/AS/AT)
VOH
VOL
VOH
VOL
VOL
VRST(MAX) < VCC < 3.6V ISOURCE = 500µA
VRST(MAX) < VCC < 3.6V ISINK = 1.2mA
4.5V < VCC < 5.5V
IRSOURCE =
800µA
4.5V < VCC < 5.5V
ISINK = 3.2mA
MAX70_C VCC = 1.0V, ISINK = 50µA
MAX70_E/M: VCC = 1.2V, ISINK = 100µA
0.8 x
VCC
VCC -
1.5
0.3
V
0.4
0.3
0.3
2 _______________________________________________________________________________________


Part Number MAX706T
Description Low-Cost uP Supervisory Circuits
Maker Maxim Integrated
Total Page 15 Pages
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