29.1 µHz to 977 Hz — the sub-Hz silicon oscillator that replaces RC timers
The LTC6991CS6#TRMPBF is a silicon oscillator from the TimerBlox® family that generates programmable frequencies from 29.1 µHz to 977 Hz. That bottom end is where this part earns its keep: watchdog timers, power-up sequencing delays, periodic wake-up intervals that a resistor-capacitor network cannot hold with any repeatability. Supply current is 135 µA typical, which keeps the timing block alive on a coin cell or a lightly loaded rail without draining the system budget. The part is listed as a silicon oscillator — no external crystal, no load-capacitance matching, no drive-level calculation. Frequency is set by one external resistor; the internal PLL and divider chain do the rest.
Supply range and temperature grade — commercial-only envelope
Operating supply spans 2.25 V to 5.5 V, covering logic rails without a separate regulator.
Active production — no end-of-life watch needed
Product status is Active, meaning Analog Devices continues to manufacture and support this order code. ROHS3 compliant. Available in Tape & Reel (TR) and Cut Tape (CT) options.