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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 (G690L) Push-Pull RESET Output (G690H) Open-Drain RESET Output (G691L) 140ms min Power-On Reset Pulse Width 10µA Supply Current Guaranteed Reset Valid to VCC = +1V Power Supply Transient Immunity No External Components 3-Pin SOT-23 and SC-70-3(SOT-323) Packages
Applications
Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable / Battery-Powered Equipment Automotive General Description The G690/G691 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, keeping it asserted for at least 140ms after V CC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The G691L has an open-drain output stage, while the G690 have push-pull outputs. The G691L ’s open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than V CC. The G690L have an active-low RESET output, while the G690H 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 G690/G691 ideal for use in portable equipment. The G690/G691 are available in 3-pin SOT-23 and SC-70-3(SOT-323) packages. Pin Configuration Typical Application Circuit RESET INPUT GND µP VCC RESET (RESET) GND G690/G691 VCC RPULL-UP VCC *G691 ONLY SOT-23/SC-70-3(SOT-323) 1 2 ICC may increased at high TA, Therefore, can not connect Resistors to VCC to prevent Icc abnormal behavior at high T A. RESET INPUT GND µP VCC RESET (RESET) GND G690/G691 VCC RPULL-UP VCC *G691 ONLY SOT-23/SC-70-3(SOT-323) 1 2 RESET INPUT GND µP VCC RESET (RESET) GND G690/G691 VCC RPULL-UP VCC *G691 ONLY SOT-23/SC-70-3(SOT-323) 1 2 ICC may increased at high TA, Therefore, can not connect Resistors to VCC to prevent Icc abnormal behavior at high T A.