Linear Technology LTC6994 delay block

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Linear Technology has released the LTC6994, an accurate and simple delay block, based on the company’s silicon oscillator technology and the newest member of the TimerBlox family.

The device contains a delay circuit that is simply programmed using one to three resistors, providing a programmable range of 1 µs to 33.6 s. This delay can also be controlled via a separate input voltage. Delay error is less than 2.3% and two versions are available - the LTC6994-1 and LTC6994-2.

The 6994-1 will delay either the rising or falling edge of the input signal, as selected by the user. With a rising edge delay, the output follows the input high after the delay period and remains high until the input falls.

With a falling edge delay, the output follows the input low after the delay period and remains low until the input rises. This operation is well suited to pulse applications.

The LTC6994-2 will delay both the rising and falling edge of the input signal. The output only responds to input changes that persist longer than the delay period. It is suitable for switch debouncing, delay matching and guaranteeing that a signal meets minimum pulse width requirements.

The device is part of the TimerBlox family of silicon timing devices in which an accurate programmable oscillator is combined with precision circuitry and logic. No capacitors, no crystals, no microcontroller and no programming are required.

The devices are solid state and can be operated under high acceleration, vibration and temperature extremes. They offer higher accuracy, stability and lower power consumption than typical resistor/capacitor-based oscillators.

The 20 mA source and sink capability allows for directly driving opto-isolators and transformers for electrical isolation. Fully specified over the temperature range of -40 to 125°C, the parts are suitable for motor vehicle and industrial environments where many oscillators and microcontrollers are unable to operate.