MAX6335

Features:

 Ultra-Low 0.7V Operating Supply Voltage
Low 3.3µA Supply Current
 Precision Monitoring of 1.8V and 2.5V Power-
    Supply Voltages
 Reset Thresholds Available from 1.6V to 2.5V,
    in Approximately 100mV Increments
 Debounced Manual Reset 
Fully Specified over Temperature
 Three Power-On Reset Pulse Widths Available
    (1ms min, 20ms min, 100ms min)
 Low Cost
 Three Available Output Structures: Push/Pull
    ,RESET, Push/Pull RESETOpen-Drain ,RESET
 Guaranteed RESET/,RESET Valid to VCC = 0.7V
    (MAX6335/MAX6336)
 Power-Supply Transient Immunity
 No External Components
 4-Pin SOT143 Package
 Pin-Compatible with MAX811/MAX812 and
    MAX6314/MAX6315


Application

Pentium II™ Computers
Computers
Controllers
Intelligent Instruments
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive


Specifications

Terminal Voltage (with respect to GND)
     VCC .....................................................................- 0.3V to +6V
     Push/Pull RESET or ,RESET, ,MR ............   -0.3V to (VCC + 0.3V)
     Open-Drain ,RESET .............................................. -0.3V to +6V
Input Current (V_CC) ...........................................................  20mA
Output Current (RESET, ,RESET).........................................  20mA
Rate of Rise, V_CC ............................................................ 100V/µs
Continuous Power Dissipation (T_A = +70°C)
    SOT₁₄₃ (derate 4mW/°C above +70°C) ....................320mW
Operating Temperature Range .........................-40°C to +85°C
Storage Temperature Range ..........................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+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.


Description

The MAX6335/MAX6336/MAX6337 microprocessor (µP) supervisory circuits monitor the power supplies in 1.8V to 3.3V µP and digital systems. They increase circuit reliability and reduce cost by eliminating external components and adjustments. They also feature a debounced manual-reset input.

The MAX6335 perform a single function: they assert areset signal whenever the VCC supply voltage declines below a preset threshold or whenever manual reset is asserted. Reset remains asserted for a preset timeout period after VCC has risen above the reset threshold or after manual reset is deasserted. The only difference among the three devices is their output. The MAX6336(push/pull) and MAX6337 (open-drain) have an activelow ,RESET output, while the MAX6335 (push/pull) has an active-high RESET output. The MAX6335/MAX6336 are guaranteed to be in the correct state for VCC down to 0.7V. The MAX6337 is guaranteed to be in the correct state for VCC down to 1.0V.

The reset comparator in these ICs is designed to ignore fast transients on VCC. Reset thresholds are factorytrimmable between 1.6V and 2.5V, in approximately 100mV increments. There are 15 standard versions available (2500 piece minimum-order quantity); contact the factory for availability of nonstandard versions (10,000 piece minimum-order quantity). For space-critical applications, the MAX6335/MAX6336/MAX6337 come packaged in a 4-pin SOT143.