Features: Vcc1 (primary supply) Reset Threshold Voltages from 1.58V to 4.63V
Vcc2 (secondary supply) Reset Threshold Voltages from 0.79V to 3.08V
Externally Adjustable RSTIN Threshold for Auxiliary/Triple-Voltage Monitoring (0.62V internal reference)
Watchdog Timer Option 35s (min) Long Startup Period 1.12s (min) Normal Timeout Period
Manual Reset Input Option
Power-Fail Input/Power-Fail Output Option (Push-Pull and Open-Drain Active-Low)
Guaranteed Reset Valid Down to Vcc1 or Vcc2 = 0.8V
Reset Output Logic Options
Immune to Short Vcc Transients
Low Supply Current 14A (typ) at 3.6V
Small 5, 6, and 8-Pin SOT23 PackagesApplicationMultivoltage Systems
Telecom/Networking Equipment
Computers/Servers
Portable/Battery-Operated Equipment
Industrial Equipment
Printer/Fax
Set-Top BoxesPinout
SpecificationsTerminal Voltage (with respect to GND)
Vcc1, Vcc2 .............................................................-0.3V to +6V
Open-Drain RST, RST1, RST2, PFO, RST .................-0.3V to +6V
Push-Pull RST, RST1, PFO, RST...............-0.3V to (VCC1 + 0.3V)
Push-Pull RST2.......................................-0.3V to (VCC2 + 0.3V)
RSTIN, PFI, MR, WDI .............................................-0.3V to +6V
Input Current/Output Current (all pins) ..........................20mA
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) .......571mW
6-Pin SOT23-6 (derate 8.7mW/°C above +70°C) ........696mW
8-Pin SOT23-8 (derate 8.9mW/°C above +70°C) ........714mW
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.
DescriptionThe MAX6715MAX6729 are ultra-low-voltage microprocessor (P) supervisory circuits designed to monitor two or three system power-supply voltages. These MAX6729 assert a system reset if any monitored supply falls below its factorytrimmed or adjustable threshold and maintain reset for a minimum timeout period after all supplies rise above their thresholds. The integrated dual/triple supervisory circuits significantly improve system reliability and reduce size compared to separate ICs or discrete components.
These MAX6729 monitor primary supply voltages (VCC1) from 1.8V to 5.0V and secondary supply voltages (VCC2) from 0.9V to 3.3V with factory-trimmed reset threshold voltage options (see Reset Voltage Threshold Suffix Guide). An externally adjustable RSTIN input option allows customers to monitor a third supply voltage down to 0.62V. These MAX6729 are guaranteed to be in the correct reset output logic state when either VCC1 or VCC2 remains greater than 0.8V.
A variety of push-pull or open-drain reset outputs along with watchdog input, manual reset input, and power-fail input/output features are available (see Selector Guide). Select reset timeout periods from 1.1ms to 1120ms (min) (see Reset Timeout Period Suffix Guide). The MAX6729 are available in small 5, 6, and 8-pin SOT23 packages and operate over the -40°C to +85°C temperature range.
MAX6729 Data Sheet
