DESCRIPTION
The LTC®6991 is a silicon oscillator with a programmable period range of 1.024ms to 9.54 hours (29.1µHz to 977Hz), specifically intended for long duration timing events. The LTC6991 is part of the TimerBlox™ family of versatile silicon timing devices.

FEATURES
■ Period Range: 1ms to 9.5 Hours
■ Configured with 1 to 3 Resistors
■ <1.5% Maximum Frequency Error
■ Output Reset Function
■ 2.25V to 5.5V Single Supply Operation
■ 55µA to 80µA Supply Current (2ms to 9.5hr Clock Period)
■ 500µs Start-Up Time
■ CMOS Output Driver Sources/Sinks 20mA
■ –40°C to 125°C Operating Temperature Range
■ Available in Low Profile (1mm) SOT-23 (ThinSOT™) and 2mm × 3mm DFN Packages

APPLICATIONS
■ “Heartbeat” Timers
■ Watchdog Timers
■ Intervalometers
■ Periodic “Wake-Up” Call
■ High Vibration, High Acceleration Environments
■ Portable and Battery-Powered Equipment