The maximum frequency of operation for the HEF4047BP is typically around 10 MHz, but it can vary depending on the specific application and operating conditions.
To ensure stable operation, make sure to follow proper PCB design guidelines, decouple the power supply with capacitors, and use a stable clock signal. Additionally, ensure that the input signals are within the recommended voltage levels and that the device is operated within the recommended temperature range.
A simple power-on reset circuit can be implemented using a resistor, capacitor, and diode. The capacitor is charged through the resistor when power is applied, and the diode ensures that the capacitor is discharged when power is removed. This circuit ensures that the HEF4047BP is properly reset on power-up.
The asynchronous reset input (MR) should be tied to VCC through a resistor (typically 1 kΩ) and a capacitor (typically 10 nF) to ensure that the device is properly reset on power-up. The reset input should be driven low for at least 10 ns to ensure a proper reset.
The recommended clock signal for the HEF4047BP is a square wave with a frequency between 1 kHz and 10 MHz, and an amplitude of at least 2 V. The clock signal should be driven from a low-impedance source to ensure proper operation.
HEF4047BP,652 datasheet
by NXP Semiconductors
