HEF4520BT

The HEF4520BT from NXP Semiconductors is a dual 4-bit internally synchronous binary counter. It features two clock inputs (nCP0 and nCP1) and an asynchronous master reset input (nMR). The counter advances on specific clock transitions, and the master reset input forces all outputs to a low state.

This component is designed for a wide supply voltage range, from 3.0 V to 15.0 V, and operates reliably within a temperature range of -40 °C to +85 °C. It offers a typical propagation delay of 220 ns and a maximum operating frequency of 8 MHz, making it suitable for various digital logic applications.

The HEF4520BT is available in a 16-lead SOIC package (SO16) suitable for surface mounting. Its inputs include clamp diodes, allowing the use of current-limiting resistors for interfacing with voltages exceeding VDD. The device exhibits CMOS low power dissipation and high noise immunity, characteristic of its technology.

Key electrical specifications include a maximum supply current of 50 mA and a quiescent current of 80 µA. The counter has 4 bits per counter and there are 2 circuits per package. This makes the HEF4520BT a versatile component for counting and frequency division tasks in digital systems.