HEF4521BP,652

Counter Dividers Overview

The HEF4521BP,652 is a 24-stage frequency divider and oscillator manufactured by Nexperia. It consists of a chain of 24 toggle flip-flops with an overriding asynchronous master reset input (MR). The device features an input circuit supporting three modes: crystal oscillator, external oscillator buffer, or RC oscillator. It operates over a recommended supply voltage range of 3 V to 15 V referenced to VSS. Unused inputs must be connected to VDD, VSS, or another input.

Counter Dividers Feature Summary

• Supports crystal, external oscillator, and RC oscillator configurations via dedicated input pins.
• Provides outputs from the last seven stages for flexible frequency division ratios.
• Includes a functional test mode that divides the counter into three parallel 8-stage sections.

Counter Dividers Applications

• Frequency division circuits
• Oscillator designs using external crystals
• Timing systems requiring high-count capacity

Counter Dividers Procurement Notes

Verify the package type matches the required application, as the datasheet specifies SO16 (SOT109-1) for the BT suffix. Confirm the specific ordering code aligns with the desired package variant. Ensure design parameters comply with the absolute maximum ratings provided in the official documentation.

Counter Dividers Selection Notes

Select this component for applications requiring a single-chip solution for high-ratio frequency division. Consider the wide supply voltage range and low power dissipation characteristics. Verify that the output drive capabilities meet the load requirements of the subsequent circuitry.

Counter Dividers Part Context

This part belongs to the HEF4000B CMOS logic family. It is designed for general-purpose digital applications requiring stable operation across a broad temperature range. The device integrates multiple functions into a single package to reduce board space.

Counter Dividers Replacement Considerations

Check for compatible parts within the same logic family. Ensure any substitute supports the required 24-stage count capacity and oscillator functionality. Verify pin compatibility and electrical specifications match the original design constraints.