G660 G661 G662 台湾致新代理商 GMT 重置系列 嵌入式延迟时间
Microprocessor Reset IC

General Description The G660/G661/G662 provide circuits initialization and timing   supervision,   primarily   for   DSP   and   proces-sor-based    systems.    During    power-on,    RESET(RESET)  is  asserted  when  supply  voltage  VCC  be-comes  higher  than  1.1  V.  Thereafter,  the  supply  volt-age  supervisor  monitors  VCC  and  keeps  RESET(RESET)  active  as  long  as  VCC  remains  below  the  threshold voltage VIT+(1).

An internal timer delays the return of the output to the inactive  state  to  ensure  proper  system  reset.  The  de-lay  time,  td,  starts  after  VCC  has  risen  above  the  threshold voltage VIT+. When the supply voltage drops below  the  threshold  voltage  VIT-(2),  the  outputs  be-comes  active  again.  No  external  components  are  re-quired.  All  the  devices  have  a  fixed-sense  threshold  voltage VIT- set by an internal voltage divider.

The G660/G661 incorporate a manual reset input,MR. A  low  level  at  MR  causes  RESET   (RESET)  to  be-come  active.  The  G660/G661/G662  have  WDI  pin.  The watchdog timer is periodically triggered by a posi-tive or negative transition at WDI. When the supervis-ing system fails to retrigger the watchdog circuit within the time-out interval, ttout, RESET   (RESET)  becomes  active  for  the  time  period  td.  This  event  also  reinitial-izes  the  watchdog  timer.  Leaving  WDI  unconnected  disables the watchdog.

The product spectrum is designed for supply voltages of 2.5V, 3V, 3.3V, and 5V. The circuits are available in a SOT-23-5 package.

Note:
(1) VIT+ means the reset voltage of VCC from low to high
(2) VIT- means the reset voltage of VCC from high to low.

Features „
Power-On Reset Generator With Fixed Delay Time of 200ms „
Manual Reset Input (G660/G661)
„Available in three RESET Output Options
Push-Pull RESET   Output  (G660L/G662)
Push-Pull RESET Output (G660H/G662)
Open-Drain RESET   Output  (G661L)  „
Supply Voltage Supervision Range   2.5V, 3V, 3.3V, 5V „
Watchdog Timer (G660/G661/G662) „
Supply Current of 10μA at VCC=3.3V „
SOT-23-5 Package
„Temperature Range . . . −40°C to 85°C

Applications „
Critical μP and μC Power Monitoring „
Industrial Equipment
„Programmable Controls „
Automotive Systems
„Portable/Battery-Powered Equipment „
Intelligent Instruments „
Wireless Communications Systems „
Notebook/Desktop Computers

Pin  Configuration                                                                                                                             Typical  Application  Circuit

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