ADM697

a FEATURES Superior Upgrade for MAX696/MAX697 Specified Over Temperature Adjustable Low Line Voltage Monitor Power OK/Reset Time Delay Reset Assertion Down to 1 V VCC Watchdog Timer—100 ms, 1.6 s, or Adjustable Low Switch On Resistance 1.5 ⍀ Normal, 20 ⍀ in Backup 600 nA Standby Current Automatic Battery Backup Switching (ADM696) Fast On-Board Gating of Chip Enable Signals (ADM697) Voltage Monitor for Power Fail or Low Battery Warning APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems Critical ␮ P Power Monitoring VBATT Microprocessor Supervisory Circuits ADM696/ADM697 FUNCTIONAL BLOCK DIAGRAMS BATT ON VOUT VCC LLIN LOW LINE RESET RESET GENERATOR RESET OSC IN OSC SEL TIMEBASE FOR RESET AND WATCHDOG WATCHDOG TIMER WATCHDOG TRANSITION DETECTOR WATCHDOG OUTPUT (WDO) WATCHDOG INPUT (WDI) POWER FAIL INPUT (PFI) 1.3V ADM696 POWER FAIL OUTPUT (PFO) GENERAL DESCRIPTION The ADM696/ADM697 supervisory circuits offer complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup-battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning. The ADM696/ADM697 are available in 16-pin DIP and small outline packages and provide the following functions: 1. Power-On Reset output during power-up, power-down and brownout conditions. The RESET voltage threshold is adjustable using an external voltage divider. The RESET out...