Features: ` Factory-Set Reset Threshold Voltages for Monitoring Supplies from 0.9V to 1.5V (MAX6841/MAX6842)
` Adjustable Threshold RESET IN (MAX6843/MAX6844/MAX6845)
` Low Power Consumption: 5.7A (typ)
` ±2.5% Reset Threshold Accuracy Over Temperature
` Five Timeout Periods: 150s (Voltage Detector Version), 1.5ms, 30ms, 210ms, and 1.68s
` Available in Three Output Configurations
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
` Guaranteed Reset Valid to VCC = 0.55V (Active Low)
` Manual Reset Input
` Immune to Short VCC Transients
` Space-Saving 5-Pin SOT23 PackageApplication`Computers
`Controllers
`Intelligent Instruments
`Critical P and C Power Monitoring
`Portable/Battery-Powered Equipment
`Telecom/Networking Equipment
`Basestations
`Servers/WorkstationsPinout
SpecificationsTerminal Voltage (with respect to GND)
VCC.......................................................................-0.3V to +6V
MR, RESET IN, RESET (open-drain)........................-0.3V to +6V
Push-Pull RESET and RESET .....................-0.3V to (VCC + 0.3V)
Input Current (all pins) ....................................................20mA
Output Current (RESET,RESET).........................................20mA
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
Operating Temperature Range .......................-40°C to +85°C
Junction Temperature....................................................+150°C
Storage Temperature Range ........................-65°C to +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 MAX6844 microprocessor (P) supervisory circuits monitor ultra-low-voltage power supplies in P and digital systems. They provide excellent circuit reliability at low cost by eliminating external components and adjustments when used with +0.9V to +1.5V systems. Factory-trimmed reset thresholds are available for the MAX6841/MAX6842. The MAX6843/MAX6844/MAX6845 provide a RESET IN input, allowing the user to externally adjust the reset threshold. The MAX6844 features a debounced manual reset input (MR). The reset comparator is designed to ignore fast transients on VCC.
The MAX6844 assert a reset signal whenever the VCC supply voltage declines below a preset or adjustable threshold or whenever manual reset (MR) is asserted. Reset remains asserted for a fixed timeout delay after VCC has risen above the reset threshold and when manual reset is deasserted. Five timeout periods of MAX6844 are available for each part: 150s (voltage detector version), 1.5ms, 30ms, 210ms, and 1.68s (typ).
The MAX6841/MAX6843 have an active-low push-pull reset output. The MAX6841/MAX6842/MAX6844 have an active-high push-pull reset output, and the MAX6842/MAX6845 have an active-low open-drain reset output. The active-low open-drain reset output requires a pullup resistor that can be connected to a voltage from 0 to VCC.
The low supply current (5.7A) and small package (SOT23-5) make the MAX6844 ideal for use in portable equipment.
MAX6844 Data Sheet
