The 74HCT123D,653 is a dual retriggerable monostable multivibrator, commonly known as a "timer," designed to generate accurate time delays. This integrated circuit (IC) component is part of the 74HCT series, which is a high-speed CMOS (Complementary Metal-Oxide-Semiconductor) technology.
Some key features of the 74HCT123D,653 include:
1. Dual monostable multivibrator: The IC consists of two independent monostable multivibrators, allowing the generation of two separate timers or delays within a single package.
2. Retriggerable operation: The multivibrators in this IC can be retriggered by applying a negative pulse during the timing period, which extends the timing cycle. This feature makes it suitable for generating time delays with variable trigger signals.
3. Wide range of timing durations: The 74HCT123D,653 offers a wide range of timing durations, which can be set using external resistors and capacitors. The timing period can be adjusted from microseconds to several seconds.
4. Schmitt-trigger inputs: The IC includes Schmitt-trigger inputs, which provide a hysteresis effect. This allows the inputs to be more tolerant to noisy or slowly varying signals, improving the robustness of the device
