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Tiny Low Frequency Clock Chip Supports Long Duration Timing from 1ms to 9.5hrs
MILPITAS, CA - September 1, 2010 - Linear Technology announces
the LTC6991, a simple, accurate low frequency
clock specifically designed for long duration timing applications.
The LTC6991 is the latest part in the TimerBloxTM family of
versatile silicon timing devices, in which an accurate programmable
oscillator is combined with precision circuitry and logic. An
extremely wide programmable frequency range allows the clock to
operate with a period from 1ms to 9.5 hours. This makes the
LTC6991 useful for intervalometers, watchdog timers and periodic
wake-up timers with minimal components and effort.
The LTC6991 is simply programmed, using 1 to 3 resistors, with a
maximum frequency error that is guaranteed to be less than
1.5%. The LTC6991 offers glitch-free, first cycle accurate
start-up within 500us of power, and a reset function is available
to truncate the output pulse and hold the output in a high or low
state. The polarity of the reset input and the output signal can be
configured for active-low or active-high operation. In
addition, the output frequency of the LTC6991 can be dynamically
controlled via a separate control voltage.
TimerBlox devices are solid state and can be operated under high
acceleration, vibration and temperature extremes. No timing
capacitors, no crystals, no microcontroller and no programming are
required. They offer higher accuracy, stability and lower power
consumption than typical resistor/capacitor-based oscillators. The
20mA source and sink capability enables direct driving of
opto-isolators for electrical isolation. Fully specified over
the temperature range of -40°C to 125°C, the TimerBlox parts are
suitable for demanding automotive and industrial environments,
where many oscillators and microcontrollers are unable to
operate. The small SOT23 footprint allows each timing device
to be placed at the point of use, without routing signals over long
distances, providing an ideal timer for space-limited applications
such as handheld and portable devices.
"With the LTC6991, the designer can forget about big crystals, rows
of counters and the headaches of programming," says Doug LaPorte,
design manager for Linear Technology. "The LTC6991 is
extremely easy to use."
The LTC6991 is now available, priced starting at $1.35 each in
1,000-piece quantities. Other TimerBlox devices will be introduced
over the next month. For more information, visit www.linear.com/6991.
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Summary of Features: LTC6991
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Very Low Frequency Oscillator for |
