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Linear Tech intros low frequency clock

02 Apr 2013

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Linear LTC6995

Linear Technology has introduced what it describes as a simple, accurate low frequency clock configurable for long duration power-on reset and watchdog timer applications. As the latest member in the TimerBlox family of silicon timing devices, the LTC6995 combines an accurate programmable oscillator with precision circuitry and logic, the company stated.

An extremely wide resistor-settable frequency range provides a clock period from 1ms to 9.5 hours. Upon power-on or a reset signal, the LTC6995 will initiate a full output clock cycle. The reset capability and programmable period are specifically intended for long duration timing events.

The LTC6995 is simply programmed, using 1-3 resistors, with a maximum frequency error guaranteed less than 1.5 per cent. The reset function will truncate the output pulse, clear the internal dividers 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. Two versions of the LTC6995 are available, with inverted reset functionality; the reset on the LTC6995-1 is active high, and active low for the LTC6995-2. The output polarity in the reset condition is selectable for both versions.

TimerBlox devices are solid state and can be operated under high acceleration, vibration and temperature extremes. They require no timing capacitors, crystals, MCU or programming. These devices offer higher accuracy and stability, and lower power consumption than typical resistor/capacitor-based oscillators. The devices' 20mA source and sink capability enables direct driving of opto-isolators for electrical isolation. Fully specified over the temperature range of -55°C to 125°C, the TimerBlox devices are suitable for demanding automotive and industrial applications, where many oscillators and MCUs 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, stated the company.

The device features 55-80µA supply current, 500µs start-up time and 2.25-5.5V single supply operation. The LTC6995 is now available, priced starting at $1.35 each in 1,000-piece quantities.

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