Introducing the 74HC123BQ Monostable Multivibrator by NXP

The 74HC123BQ is a high-speed Si-gate CMOS device and is pin compatible with low-power Schottky TTL (LSTTL). It is fabricated with silicon gate CMOS technology which ensures low power consumption and a robust, high-performance operation. This integrated circuit is designed to feature two retriggerable-resettable monostable multivibrators, making it a versatile choice for a wide range of pulse generation and timing applications.

The device is part of the 74HC, HCT family, which is known for its high noise immunity and the ability to drive 10 LSTTL loads. The 74HC123BQ is characterized by its functionality where each multivibrator has an active LOW trigger input (nA), an active HIGH trigger input (nB), an overriding active LOW direct reset input (nCD), an output (nQ), and a complementary output (nQ).

One of the key features of the 74HC123BQ is its ability to retrigger. The output pulse width is determined by the external timing components, namely the resistor (REXT) and the capacitor (CEXT). The pulse duration is controlled precisely by these components, allowing for a wide range of timing adjustments. The timing is further enhanced by the availability of two separate trigger inputs for each multivibrator, which can be used to generate output pulses in response to various input conditions.

The 74HC123BQ also boasts an automatic reset function. When power is applied, an internal power-on reset circuit will force the Q output LOW and the Q output HIGH, ensuring that the device starts in a predictable state. This feature is particularly useful in systems where a clean initial state is crucial.

Designed for use in applications requiring high-speed operation, the 74HC123BQ is available in a DHVQFN16 package, which is both space-saving and efficient for PCB layout. Its wide operating voltage range of 2.0V to 6.0V and the ability to operate across a broad temperature range (-40°C to +125°C) make it suitable for use in various industrial and consumer electronics applications.

The 74HC123BQ from NXP is an ideal choice for designers looking for a reliable, high-performance solution for timing, pulse generation, and sequential logic applications.