MAX6334

Features:

' Ultra-Low 0.7V Operating Supply Voltage
' Low 3.3A 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
' 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 RESET, Open-Drain RESET
' Guaranteed RESET/RESET Valid to VCC = 0.7V (MAX6332/MAX6333)
' Power-Supply Transient Immunity
' No External Components
'3-Pin SOT23 Package
' Pin-Compatible with MAX809/MAX810 and MAX6326/MAX6327/MAX6328


Application

Pentium II^(TM) Computers
Computers
Controllers
Intelligent Instruments
Critical P/C Power Monitoring
Portable/Battery-Powered Equipment
Automotive


Specifications

Terminal Voltage (with respect to GND)
V_CC ..........................................................................-0.3V to +6V
Push/Pull RESET, RESET...............................-0.3V to (V_CC + 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/s
Continuous Power Dissipation (TA = +70°C)
SOT23-3 (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


Description

The MAX6332/MAX6333/MAX6334 microprocessor (P) supervisory circuits monitor the power supplies in 1.8V to 3.3V P and digital systems. They increase circuit reliability and reduce cost by eliminating external components and adjustments.

These devices perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for a preset timeout period after VCC has risen above the reset threshold. The only difference among the three devices is their output. The MAX6333 (push/pull) and MAX6334 (open-drain) have an active-low RESET output, while the MAX6332 (push/pull) has an active-high RESET out- put. The MAX6332/MAX6333 are guaranteed to be in the correct state for VCC down to 0.7V. The MAX6334 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 factory- trimmable between 1.6V and 2.5V, in approximately 100mV increments. There are 15 standard versions available (2,500 piece minimum-order quantity); con- tact the factory for availability of nonstandard versions (10,000 piece minimum-order quantity). For space-criti- cal applications, the MAX6332/MAX6333/MAX6334 come packaged in a 3-pin SOT23.