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Technical content
Features
Precision Monitoring of +3V, +3.3V, and +5V Power-Supply Voltages Fully Specified Over Temperature Available in Three Output Configurations Push-Pull RESET Output (G670L) Push-Pull RESET Output (G670H) Open-Drain RESET Output (G671L) 2ms max Power-On Reset Pulse Width 14µA Supply Current Guaranteed Reset Valid to VCC = +1V Power Supply Transient Immunity No External Components 3-Pin SOT-23,TO-92, SC-70-3(SOT-323) and SOT-89 Packages 2% Reset Threshold Accuracy with 5% Hys- teresis
Applications
Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable / Battery-Powered Equipment Automotive General Description The G670/G671 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- pow- ered circuits. These circuits perform a single function: they assert a reset signal whenever the V CC supply voltage declines below a preset threshold. Reset thresholds suitable for operation with a variety of supply voltages are avail- able. The G671L has an open-drain output stage, while the G670 have push-pull outputs. The G671L’s open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than V CC. The G670L have an active-low RESET output, while the G670H has an active-high RESET output. The reset com- parator is designed to ignore fast transients on V CC, and the outputs are guaranteed to be in the correct logic state for V CC down to 1V. Low supply current makes the G670/G671 ideal for use in portable equipment. The G670/G671 are avail- able in 3-pin SOT-23, TO-92, SC-70-3(SOT-323) and SOT-89 packages. P i n C o n f i g u r a t i o n T y p i c a l A p p l i c a t i o n C i r c u i t SOT-23/ SC-70-3 (SOT-323) RESET INPUT GND µP VCC RESET (RESET) GND G670/G671 VCC RPULL-UP VCC *G671 only 1 2 Top View 1 2 3 Top View 1 2 3 SOT-89 TO-92 13 2 Top View 0.1µF ICC may increased at high TA, Therefore, can not connect Resistors to VCC to prevent Icc abnormal behavior at high T A. SOT-23/ SC-70-3 (SOT-323) RESET INPUT GND µP VCC RESET (RESET) GND G670/G671 VCC RPULL-UP VCC *G671 only 1 2 Top ViewTop View 1 2 3 Top View 1 2 3 SOT-89 TO-92 13 2 Top View 0.1µF ICC may increased at high TA, Therefore, can not connect Resistors to VCC to prevent Icc abnormal behavior at high T A.