G670 G671  台湾致新代理商 GMT 重置系列 嵌入式延迟时间 G671L263T93U
Microprocessor Reset IC

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 VCC 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  VCC.  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  VCC, and  the  outputs  are  guaranteed  to  be  in  the  correct  logic state for VCC 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.

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

Pin Configuration                                                                                                             Typical Application Circuit

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