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3-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits

Industry's-First Stand-Alone Reset ICs for 1.8V supplies in SOT package

Product Details

Key Features

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 1.2 to 1.8
1.8 to 2.5
Reset Thresh. Accur. (%) (@ +25°C) 1.8
Reset Out Active Low
Push-Pull
tRESET (min) 1ms to 15ms
15ms to 85ms
85ms to 300ms
Watchdog Feature No Watchdog
ICC (µA) (max) 7
Package/Pins SOT23/3
Budgetary
Price (See Notes)
1.51
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Simplified Block Diagram

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Parameters

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 1.2 to 1.8
1.8 to 2.5
Reset Thresh. Accur. (%) (@ +25°C) 1.8
Reset Out Active Low
Push-Pull
tRESET (min) 1ms to 15ms
15ms to 85ms
85ms to 300ms
Watchdog Feature No Watchdog
ICC (µA) (max) 7
Package/Pins SOT23/3
Budgetary
Price (See Notes)
1.51

Key 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
  • 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 Active-Low RESET, Push/Pull RESET, Open-Drain Active-Low RESET
  • Guaranteed RESET/Active-Low 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

Applications/Uses

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

Description

The MAX6332/MAX6333/MAX6334 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.

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 output. 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); contact the factory for availability of nonstandard versions (10,000 piece minimum-order quantity). For space-critical applications, the MAX6332/MAX6333/MAX6334 come packaged in a 3-pin SOT23.

Simplified Block Diagram

MAX6332, MAX6333, MAX6334: Typical Operating Circuit MAX6332, MAX6333, MAX6334: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .