MAX803

Features:

Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages
Fully Specified Over Temperature
Available in Three Output Configurations
   Open-Drain RESET Output (MAX803)
   Push-Pull RESET Output (MAX809)
   Push-Pull RESET Output (MAX810)
140ms min Power-On Reset Pulse Width
12µA Supply Current
Guaranteed Reset Valid to VCC = +1V
Power Supply Transient Immunity
No External Components
3-Pin SC70 and SOT23 Packages

Application

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


Pinout




Specifications

Terminal Voltage (with respect to GND)
   V_CC...................................................................-0.3V to +6.0V
   RESET, RESET (push-pull) ......................-0.3V to (V_CC + 0.3V)
   RESET (open drain)...........................................-0.3V to +6.0V
Input Current, V_CC ............................................................20mA
Output Current, RESET , RESET ..........................................20mA
Rate of Rise, V_CC ...........................................................100V/µs
Continuous Power Dissipation (TA = +70°C)
3-Pin SC70 (derate 2.17mW/°C above +70°C) .............174mW
3-Pin SOT23 (derate 4mW/°C above +70°C).................320mW
Operating Temperature Range .......................-40°C to +105°C
Storage Temperature Range ...........................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C


Description

The MAX803/MAX809/MAX810 are microprocessor (µP) supervisory circuits used to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V, +3.0V, or +2.5V-powered circuits.

These circuits MAX803 perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available.

The MAX803 has an open-drain output stage, while the MAX809/MAX810 have push-pull outputs. The MAX803's open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than VCC. The MAX803/MAX809 have an active-low RESET output, while the MAX810 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 1V.

Low supply current makes the MAX803/MAX809/MAX810 ideal for use in portable equipment. The MAX803 is available in a 3-pin SC70 package, and the MAX809/MAX810 are available in 3-pin SC70 or SOT23 packages.