Simple & Small Delay Block Offers Accurate Timing for 1us to 33.6s

The LTC6994-1 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 for pulse qualification. 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. The LTC6994-2 is ideal for switch debouncing, delay matching and guaranteeing that a signal meets minimum pulse width requirements.

The LTC6994 is part of the TimerBlox family of versatile 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. TimerBlox 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 20mA source and sink capability allows for directly driving opto-isolators and transformers 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, and provides an ideal timer for space-limited applications such as handheld and portable devices.

Adding an accurate delay to any circuit should be this simple and easy, says Doug LaPorte, design manager for Linear Technology.