Features: ` MAX Package, Small 8-Pin SO
` Precision Supply-Voltage Monitors
2.63V (MAX706P/R, MAX706AP/AR, and MAX708R)
2.93V (MAX706S, MAX706AS, and MAX708S)
3.08V (MAX706T, MAX706AT, and MAX708T)
` 200ms Reset Time Delay
` Debounced TTL/CMOS-Compatible Manual Reset Input
` 100A Quiescent Current
` WDI Disable Feature (MAX706AP/AR/AS/AT)
` Watchdog Timer: 1.6s Timeout
` 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)
` Voltage Monitor for Power-Fail or Low-Battery Warning
` 8-Pin Surface-Mount Package
` Guaranteed RESET Assertion to VCC = 1V
Application`Battery-Powered Equipment
`Portable Instruments
`Computers
`Controllers
`Intelligent Instruments
`Critical P Power MonitoringPinout
SpecificationsTerminal 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 MAX (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.DescriptionThe MAX706P/R/S/T, MAX706AP/AR/AS/AT, and MAX708R/S/T microprocessor (P) supervisory circuits reduce the complexity and number of components required to monitor +3V power-supply levels in +3V to +5V P systems. These MAX708R/S/T significantly improve system reliability and accuracy compared to separate ICs or discrete components.
The MAX708R/S/T supervisory 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 watchdog timer function for the MAX706AP/AR/AS/AT disables 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 MAX708R/S/T are available in 8-pin SO, DIP, and MAX® packages and are fully specified over the operating temperature range.
MAX708R/S/T Data Sheet
