致新GMT G690L293T73Uf SOT23-3

　　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- 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 140ms after VCC 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 VCC. The G690L

　　have an active-low RESET output, while the G690H

　　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 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.