Max699 Low Cost Power-on Reset And Watchdog Controllers

Descripción

The MAX698 and MAX699 monitor the +5V supply in microprocessor and digital systems. They supply a RESET pulse of at least 140ms duration on power-up, power-down, and during low voltage 'brown out" conditions. Circuit reliability is increased at reduced cost by eliminating ali externa! components and adjustments.
The MAX699 includes all features of the MAX698 but also provides a "watchdog" input to monitor microprocessor activity. The RESET output goes low if the watchdog input (WDI) is not toggled within 1 second. The watchdog feature can be disabled by leaving WDI open.
Both parts are supplied in 8 lead DIP and 16 lead 0.3" wide Small Outline (SO) packages and are specified from 0ºC to + 70ºC for C grade devices and -40ºC to + 85ºC for E devices. The Small Outline versions, with more pins than the 8 lead DIP, have additional outputs not available in DIP packages. These are RESET (without inversion) and Watchdog Output (WDO).
Preclslon Voltage Monitor
Power OK/Reset Time Delay
Watchdog Timer
Mlnimum Component Count