G690/G691 台湾致新代理商 GMT 重置系列 嵌入式延迟时间 G691L293T73Uf
Microprocessor Reset IC

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 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 RESEToutput requires a pull-up resistor that can be connected  to  a  voltage  higher  than  VCC.  The  G690L  have  an  active-low  RESEToutput,  while  the  G690H  has  an  active-high  RESET  output.  The  reset  com-parator  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.

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

Pin  Configuration                                                                                      Typical  Application  Circuit

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