AX6902

AX6901/2/3/4(Preliminary) 3-Pin Microprocessor Reset Circuits ™ GENERAL DESCRIPTION TheAX6901/2/3/4 are used for microprocessor (µP) supervisory circuits 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 powered circuits. These circuits 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 200ms after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. TheAX6901/2/3/4 have push pull outputs. TheAX6901/3 have an active low RESET output, while theAX6902/4 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 theAX6901/2/3/4 ideal for use in portable equipment. TheAX6901/2/3/4 is available in a 3-pin SOT23 package. . ™ FEATURES Precision Monitoring of +2.5,+3V, +3.3V, and +5V Power-Supply Voltages Fully Specified Over Temperature Available in Three Output Configurations Push-Pull RESET Low Output(AX6901/3) Push-Pull RESET High Output(AX6902/4 200ms (Typ.)min Power-On Reset Pulse Width 25µA Supply Current Guaranteed Reset Valid to VCC = +1V Power Supply Transient Immunity No External Components Available in t...