The recommended operating voltage range for the HEF4521BP/652 is 3 V to 15 V, with a typical voltage of 5 V or 10 V.
To ensure proper power and decoupling, use a 0.1 μF to 1 μF ceramic capacitor between VCC and GND, and a 10 μF to 100 μF electrolytic capacitor between VCC and GND, placed as close to the device as possible.
The maximum clock frequency supported by the HEF4521BP/652 is 10 MHz, but it can be operated at higher frequencies with reduced voltage and/or reduced load capacitance.
The output enable (OE) pin is active-low, meaning it should be connected to GND to enable the outputs. When OE is high, the outputs are in a high-impedance state.
The propagation delay time (tPD) for the HEF4521BP/652 is typically around 10 ns to 20 ns, depending on the operating voltage and temperature.
HEF4521BP,652 datasheet
by NXP Semiconductors
