74HC4538D Dual Retriggerable Monostable Multivibrator SOIC-16

The 74HC4538D is a dual retriggerable-resettable monostable multivibrator from Nexperia, designed for precise and flexible pulse generation in a wide range of electronic applications. It features two trigger/retrigger inputs (nA and nB), a direct reset input (nCD), two complementary outputs (nQ and nQ), and pins for connecting external timing components (REXT and CEXT). This device allows triggering from either the positive or negative edge of an input pulse, providing versatility in control systems.

The output pulse width (T) is determined by the external components, calculated as 0.7 x REXT x CEXT, ensuring accurate and stable pulse timing. With a typical pulse width variation of only ±0.2% over the temperature range, this multivibrator delivers consistent performance across diverse operating conditions. The Schmitt-trigger action on the trigger inputs makes the circuit highly tolerant to slow rise and fall times, while the separate reset inputs allow immediate termination of the output pulse. Inputs include clamp diodes, enabling the use of current-limiting resistors to interface with voltages above VCC.

Key Features

• Dual retriggerable monostable multivibrator with reset capability
• Triggering from falling or rising edge
• CMOS input level, compliant with JEDEC standard No. 7A
• Tolerant of slow trigger rise and fall times
• Propagation delay of 24ns, output current of 5.2mA
• Supply voltage range from 2V to 6V
• Wide operating temperature range: -40°C to 125°C
• IC case style: SOIC, with 16 pins

Ideal for industrial and consumer electronics applications, the 74HC4538D delivers robust performance and precise pulse control, making it a reliable choice for time-delay generation, pulse shaping, and timing circuits.