SN74LV123ADRE4

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The SN74LV123ADRE4 is a retriggerable monostable multivibrator IC from Texas Instruments. It is designed for use in applications needing a single, controllable pulse with an adjustable duration such as time-delay generators, function generators and signal acceptance. The device offers extended input and output levels for ease of driving loads and for interfacing to switching logic circuits.

The device operates in one of two modes, depending on the logic level at the RET (Retrigger) input. The monostable mode is activated through the low-active signal of the RET. In this mode the output signal will be high when activated by the low-active input and will remain high until reset by the low-active signal of the retrigger.

The astable mode involves the low-active signal at the RET input. When activuted, the output Qn will go low and remain low until the Qn signal rises to an active level. The reset function is managed within the IC, but can be overridden by an active RET input. Once the output signal is reset, the device will remain in a low state until the RET signal goes low and activates the output.

The timing characteristics of the device are mainly dependent on the external capacitance values. The internal timing circuit is responsible for establishing the time period for the low output state of the device in both modes. The RC time constant of the external capacitor connected to the EXT pin determines the monostable timing, while the RV pin determines the astable timing.

The SN74LV123ADRE4 has an operating voltage of 2.0 - 5.5V and an operating temperature range of -40°C to 85°C. The output stage of the device includes Schmitt triggers and an effective noise immunity of 50mV. The propagation delay is typically 7.5ns and provides fast switching with minimal jitter.

In addition, the device includes two active-low reset pins, one acting as a power-on reset, while the other can be configured to provide a reset pulse regardless of the external timing components. This helps in eliminating potential problems that might arise due to incorrect capacitor values.

The SN74LV123ADRE4 is well-suited for use in a variety of applications including time-delay generators, function generators and signal acceptance. The ease of driving loads and for interfacing to switching logic circuits makes the device an ideal solution for these applications.

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