LTC6995-1/LTC6995-2 TimerBlox: Long Timer, Low Frequency Oscillator FeaTuresDescripTion n Period Range: 1ms to 9.5 Hours The LTC®6995 is a silicon oscillator with a programmable n Timing Reset by Power-On or Reset Input period range of 1.024ms to 9.54 hours (29.1µHz to 977Hz), n Configured with 1 to 3 Resistors specifically intended for long duration timing events. The n <1.5% Maximum Frequency Error LTC6995 is part of the TimerBlox® family of versatile n Programmable Output Polarity silicon timing devices. n 2.25V to 5.5V Single Supply Operation A single resistor, RSET , programs the LTC6995’s internal n 55µA to 80µA Supply Current master oscillator frequency. The output clock period (2ms to 9.5hr Clock Period) is determined by this master oscillator and an internal n 500µs Start-Up Time frequency divider, NDIV , programmable to eight settings n CMOS Output Driver Sources/Sinks 20mA from 1 to 221. n –55°C to 125°C Operating Temperature Range n Available in Low Profile (1mm) SOT-23 (ThinSOT™) N t DIV •RSET OUT = •1.024ms, NDIV =1,8,64,...,221 and 2mm × 3mm DFN Packages 50kΩ When oscillating, the LTC6995 generates a 50% duty applicaTions cycle square wave output. A reset function is provided n to stop the master oscillator and clear internal dividers. Power-On Reset Timer n Removing reset initiates a full output clock cycle which is Long Time One Shot n useful for programmable power-on reset and watchdog “Heartbeat” Timers n timer applications. Watchdog Timers n Periodic “Wake-Up” Call The LTC6995 has two versions of reset functionality. The n High Vibration, High Acceleration Environments reset input is active high for the LTC6995-1 and active low L, LT, LTC, LTM, Linear Technology, TimerBlox and the Linear logo are registered trademarks for the LTC6995-2. The polarity of the output when reset and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. is selectable for both versions. OUTPUT (OSCILLATOR START STATE)RST/RST POLARITYLTC6995-1LTC6995-2 0 0 Oscillating (Low) 0 (Reset) 1 0 0 (Reset) Oscillating (Low) 0 1 Oscillating (High) 1 (Reset) 1 1 1 (Reset) Oscillating (High) Typical applicaTionActive Low Power-On Reset Timer RST OUT V+ LTC6995-1 GND V+ V+ 5 SECONDS 0.1µF 1M OUT 1/2 t TIMER STOPPED OUT SET DIV POWER-ON RESET 118k 392k (1ms TO 4.8 HOURS) 699512 TA01 699512fa For more information www.linear.com/LTC6995-1 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts
