HEF4526BT,653

The HEF4526B is a high-speed static counter/divider integrated circuit (IC) designed specifically to implement various divide-by-n and modulo-n counting. It belongs to the Logic - Counters, Dividers family. In this article, we will discuss its application field and working principle.

The first use of the HEF4526B is in timing and clock-frequency synthesis. This IC can be used to generate exact clock signals from crystal oscillators. Its Divide-by-M and Modulo-N operations are ideal for generating clock signals with exact frequencies that are not available in the crystal oscillator. It is also very useful in data processing, interface applications and radio frequency communication.

The working principle of this IC is based on a Linear Feedback Shift Register (LFSR). An LFSR is composed of several shift registers connected in a ring, each register having a single bit of storage capacity. As each shift register is loaded and clocked, the bit stored in it is shifted out. Thus the serial data feed through the ring of shift registers from one to the other.

The HEF4526B uses a 5-bit division algorithm. This algorithm allows the distribution of a single control signal to each of the five shift registers, enabling simultaneous shifting operations of the complete register. The number of shifts to be performed is controlled by a Mode Select input, allowing Divide-By-M, Modulo-N and Divide-By-N+M operations. The division of the data is performed in two steps; first dividing by M and then by N+M.

The main application fields of the HEF4526B are in timing and clock-frequency synthesis. It can be used to generate exact clock signals from crystal oscillators. It is also very useful in data processing, interface applications and radio frequency communication. The working principle of this IC is based on a linear feedback shift register, which allows the distribution of a single control signal to each of the five shift registers, enabling simultaneous shifting operations of the complete register. The Mode Select input allows Divide-By-M, Modulo-N and Divide-By-N+M operations.