74HC4538DB,118

The 74HC4538DB,118 from Nexperia is a dual retriggerable-resettable monostable multivibrator designed for precision timing applications. Each multivibrator section can be triggered by either the positive or negative edge of an input pulse, offering flexibility in design. The output pulse width is precisely controlled by external timing components REXT and CEXT, following the formula TW = 0.7 × REXT × CEXT.

This device operates within a wide supply voltage range of 2.0 V to 6.0 V and features CMOS low power dissipation. Its inputs include clamp diodes, allowing for the use of current-limiting resistors for interfacing with voltages exceeding VCC. The Schmitt-trigger action on the trigger inputs provides high tolerance to slower rise and fall times, enhancing noise immunity.

The 74HC4538DB,118 is available in a 16-SSOP surface-mount package, making it suitable for various electronic assemblies. It is specified for operation across a temperature range of -40°C to +125°C. The device includes separate reset inputs for immediate termination of the output pulse when a LOW level is applied.

Key electrical characteristics include a propagation delay of 25 ns and output currents of 5.2mA for both high and low states. With two independent circuits per package, it offers efficient integration into complex designs requiring precise pulse generation.