LTC6991CDCB#TRMPBF

LTC®6991 is a TimerBlox: resettable, low frequency 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. A single resistor, RSET, programs the LTC6991’s internal host oscillator frequency. In normal operation, the LTC6991 oscillates with a 50% duty cycle. A reset function is provided to truncate the pulse (reducing the duty cycle). The reset pin can also be used to prevent the output from oscillating. The RST and OUT pins can be configured for active-low or active-high operation using a polarity function. Application includes “heartbeat” timers, watchdog timers, intervalometers, periodic “wake-up” call, high vibration, high acceleration environments, portable and battery powered equipment.

• Configured with 1 to 3 resistors, <lt/>1.5% maximum frequency error, output reset function
• Operating supply voltage range from 2.25V to 5.5V (TA = 25°C)
• 135µA typical supply current (RL = ∞, RSET = 50k, V+ = 5.5V, TA = 25°C)
• 500µs start-up time, CMOS output driver sources/sinks is 20mA
• 1.024mseconds minimum output clock period (V+ = 2.25V to 5.5V, TA = 25°C)
• Output frequency range from 29.1µ to 977Hz (V+ = 2.25V to 5.5V, TA = 25°C)
• Typical frequency accuracy is ±0.8% (29.1µHz ≤ fOUT ≤ 977Hz, TA = 25°C)
• Typical frequency drift over temperature is ±0.005%/°C (TA = 25°C, V+ = 2.25V to 5.5V)
• Typical frequency modulation bandwidth is 0.4Hz (TA = 25°C, V+ = 2.25V to 5.5V)
• 6 lead plastic DFN package, specified temperature range from 0°C to 70°C

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