MAX6461

Features:

Ultra-Low 1.0µA Supply Current
Preset Thresholds from +1.6V to +5.5V in 100mV Increments
Internal 5% Threshold Hysteresis
±2.5% Threshold Accuracy Over Temperature
Internal Timeout Period Option (150ms min)
Immune to Short Voltage Transients
No External Components
Available in Three Output Options: Push-Pull (Active Low/Active High) and Open Drain (Active Low)
Fully Specified from -40°C to +125°C
Small SC70 and SOT23 Packages


Application

Precision Battery Monitoring Load Switching/Power Sequencing Systems Noise-Immune µP Reset Circuits Portable/Battery-Powered Equipment Cellular Phones/Cordless Phones PDAs Portable Medical Devices


Pinout




Specifications

(All voltages referenced to GND unless otherwise noted.)
V CC , Open-Drain OUT.................................................-0.3V to +7V
Push-Pull OUT/ OUT........................................-0.3V to (V CC + 0.3V)
Input/Output Current (all pins)................................................20mA
Output Short Circuit (V CC or GND)
Continuous Power Dissipation (T A = +70° C)
    3-Pin SC70 (derate 2.9mW/° C above +70 ° C)...........228.6mW
    3-Pin SOT23 (derate 4.0mW/ ° C above +70 °C)............320mW
    5-Pin SOT23 (derate 7.1mW/ ° C above +70 °C)............571mW
Operating Temperature Range...........................-40° C to +125°C
Junction Temperature..........................................................+150°C
Storage Temperature Range...............................-65°C to +150°C
Lead Temperature (soldering, 10s).....................................+300°C


Description

The MAX6461 of ultra-low-power voltage detectors and µP reset supervisory circuits monitors battery, power-supply, and system voltages. Each circuit includes a precision bandgap reference, a comparator, internally trimmed resistor networks that set specified trip thresholds, and an internal 5% threshold hysteresis circuit  (see the  Functional Diagram ). Output is asserted when VCC falls below the internal V TH-  and remains asserted until V CC rises above V TH + (V TH + = V TH - × 1.05). These MAX6461 provide excellent circuit reliability and low cost by eliminating external components and adjustments when monitoring nominal system voltages from +1.6V to +5.5V. The MAX6461 are voltage detectors with a propagation delay of 17µs.

The MAX6464/MAX6465/MAX6466 are µP supervisory circuits with a minimum reset timeout period of 150ms. All devices are available with thresholds from +1.6V to +5.5V in 100mV increments.

The MAX6461 is available with three output stage options: push-pull with active-low output, push-pull with activehigh output, and open drain with active-low output.  These MAX6461 are available in SC70 and SOT23 packages specified over the -40°C to +125°C temperature range.