G680/G681 台湾致新代理商 GMT 复位芯片系列 嵌入式延迟时间
Microprocessor Reset IC

Part Number	Vin (V)min.	Vin (V) max.	Detecting Voltage (V)	Manual Input	Delay (ms)	Isupply(uA)	Note	Package
G680/1	2.5	5.5	Independent VXTH=1.25V	N	140	4	G680H/L Push-Pull High/Low Output G681L Open-Drain Output VHTH and VLTH can be Independent	SOT-23-5

 

General Description
The  G680/G681  are  microprocessor  (μP)  supervisory  circuits  used  to  monitor  the  power  supplies  in  μP  and  digital systems. High- and Low- voltage thresholds can be  adjusted  independently,  allowing  for  wide  hystere-sis. Voltage detection thresholds are accurate to 2%.

These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below  the  low-voltage  threshold,  keeping  it  asserted  for  at  least  140ms  after  VCC  has  risen  above  the  high-voltage threshold.

The G681L has an open-drain output stage, while the G680 have push-pull outputs. The G681L’s open-drain RESEToutput requires a pull-up resistor that can be connected  to  a  voltage  higher  than  VCC.  The  G680L  have  an  active-low  RESEToutput,  while  the  G680H  has  an  active-high  RESET  output.  The  reset  com-parator is designed to ignore fast transients on thresh-old input.

The  IC’s  power  supply  is  separate  from  the  detector  inputs, allowing the G680/G681 to be powered from a down-stream supply. Low supply current (4μA, typical) makes   the   G680/G681   ideal   for   use   in   portable   equipment.   The   G680/G681   are   available   in   SOT   -23-5 packages.

Features „
±2.5% Voltage Threshold Accuracy „
Independently Adjustable High- and Low- Voltage Thresholds „
Fully Specified Over Temperature „
Available in Three Output Configurations
Push-Pull RESET Output (G680L)
Push-Pull RESET Output (G680H)
Open-Drain RESET Output (G681L)„
140ms min Power-On Reset Pulse Width
„4μA Supply Current „
Power Supply Transient Immunity „
SOT-23-5 Packages

Applications
„Computers „
Controllers
„Intelligent Instruments
„Critical μP and μC Power Monitoring
„Portable / Battery-Powered Equipment „
Automotive

Ordering Information

ORDER NUMBER	MARKING	TEMP. RANGE	OUTPUT TYPE	PACKAGE (Green)
G680LT1Uf	680Ax	~40°C to 105°C	Push-pull RESET	SOT-23-5
G680HT1Uf	680Bx	~40°C to 105°C	Push-pull RESET	SOT-23-5
G681LT1Uf	681Ax	~40°C to 105°C	Open-Drain RESET	SOT-23-5

Note: T1: SOT-23-5

Pin  Configuration                                                                                             Typical  Application  Circuit

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