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LTC6995 - TimerBlox: Long Timer, Low Frequency Oscillator

The LTC®6995 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 LTC6995 is part of the TimerBlox® family of versatile silicon timing devices.

A single resistor, RSET , programs the LTC6995’s internal master oscillator frequency. The output clock period is determined by this master oscillator and an internal frequency divider, NDIV , programmable to eight settings from 1 to 221.

When oscillating, the LTC6995 generates a 50% duty cycle square wave output. A reset function is provided to stop the master oscillator and clear internal dividers. Removing reset initiates a full output clock cycle which is useful for programmable power-on reset and watchdog timer applications.

The LTC6995 has two versions of reset functionality. The reset input is active high for the LTC6995-1 and active low for the LTC6995-2. The polarity of the output when reset is selectable for both versions.

Features Period Range: 1ms to 9.5 Hours Timing Reset by Power-On or Reset Input Configured with 1 to 3 Resistors <1.5% Maximum Frequency Error Programmable Output Polarity 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 –55°C to 125°C Operating Temperature Range Available in Low Profile (1mm) SOT-23 (ThinSOT™) and 2mm × 3mm DFN Packages Click here to start your design with the LTC6995 Online Design Tool! Typical Application

Applications Power-On Reset Timer Long Time One Shot “Heartbeat” Timers Watchdog Timers Periodic “Wake-Up” Call High Vibration, High Acceleration Environments Packaging

Demo Boards