描述：3/3.3/4.0V μP Supervisor Circuits – Low supply current – Watchdog timer – Brownout detection The IMP706P/R/S/T/J and IMP708R/S/T/J CMOS supervisor circuits monitor power-supply and battery voltage level, and μP/μC operation. A reset is generated when the supply drops below 2.63V (IMP706P/R, IMP708R), 2.93V (IMP706S, IMP708S), 3.08V (IMP706T, IMP708T) or 4.00 (IMP706J, IMP708J). The family offers several functional options. Each device generates a reset signal during power-up, power-down and during brownout conditions. Key Features ◆ Lower power, pin compatible replacements for Maxim MAX706P/R/S/T, MAX708R/S/T ?? – 30% lower supply current:140μA vs. 200μA ◆ Precision power supply monitor ?? – 2.63V threshold (IMP706P/R, IMP708R) ?? – 2.93V threshold (IMP706S, IMP708S) ?? – 3.08V threshold (IMP706T, IMP708T) ?? – New 4.00V threshold (IMP706J, IMP708J) ◆ Debounced manual reset input ◆ Auxiliary voltage monitor comparator ?? – 1.25V threshold ?? – Battery monitor/auxiliary supply monitor ◆ Watchdog timer (IMP706P/R/S/T/J) ?? – Watchdog can be disabled by floating WDI ◆ 200ms reset time delay ◆ Three reset signal options ?? – Active HIGH: IMP706P ?? – Active LOW: IMP706R/S/T/J ?? – Active HIGH & LOW outputs: IMP708R/S/T/J ◆ DIP, SO and MicroSO packages ◆ Guaranteed RESET assertion to VCC = 1.1V Applications ◆ Computers and controllers ◆ CTI applications ◆ Embedded controllers ◆ Battery operated systems ◆ Intelligent instruments ◆ Wireless communication systems ◆ PDAs and handheld equipment