LTC694-3.3/LTC695-3.3
3.3V Microprocessor
Supervisory Circuits
FEATURES DESCRIPTION n The LTCВ®694-3.3/LTC695-3.3 provide complete 3.3V power
supply monitoring and battery control functions. These
include power-on reset, battery back-up, RAM write protection, power failure warning and watchdog timing. The
devices are pin compatible upgrades of the LTC694/LTC695
that are optimized for 3.3V systems. Operating power
consumption has been reduced to 0.6mW (typical) and
3ОјW maximum in battery back-up mode. Microprocessor
reset and memory write protection are provided when the
supply falls below 2.9V. The RESET output is guaranteed
to remain logic low with VCC as low as 1V. n Guaranteed Reset Assertion at VCC = 1V
Pin Compatible with LTC694/LTC695 for 3.3V Systems
200ОјA Typical Supply Current
Fast (30ns Typ) Onboard Gating of
RAM Chip Enable Signals
SO-8 and S16 Packages
2.90V Precision Voltage Monitor
Power OK/Reset Time Delay: 200ms or Adjustable
Minimum External Component Count
1ОјA Maximum Standby Current
Voltage Monitor for Power-Fail or …