HEF4520BP,652

Counter Dividers Overview

The HEF4520BP,652 is a dual 4-bit internally synchronous binary counter manufactured by NXP. It features two clock inputs (nCP0 and nCP1) per counter, buffered outputs from all four bit positions (nQ0 to nQ3), and an asynchronous master reset input (nMR). The device operates on a supply voltage range of 3.0 V to 15.0 V. Propagation delays vary with load capacitance; for example, at 15 V, the typical delay is 32 ns plus 0.16 ns/pF. Input transition rates are specified up to 0.08 μs/V at 15 V. The component complies with JEDEC standard JESD 13-B.

Counter Dividers Feature Summary

• Tolerant of slow clock rise and fall times
• Fully static operation
• High noise immunity
• Standardized symmetrical output characteristics

Counter Dividers Applications

• Digital counting circuits
• Frequency division applications
• Timing sequence generation

Counter Dividers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. Ensure the procurement channel provides original manufacturer packaging or authorized distribution certificates. Cross-reference the part number with the latest product data sheet revision to confirm compliance with current JEDEC standards and ESD protection specifications before finalizing orders.

Counter Dividers Selection Notes

Select this component when a dual independent 4-bit synchronous counter is required within a single integrated circuit. The device supports flexible clocking where either nCP0 or nCP1 can serve as the primary clock input while the other acts as an enable. Consider the wide supply voltage capability and CMOS low power dissipation for battery-operated or variable voltage systems requiring high noise immunity.

Counter Dividers Part Context

This component belongs to the HEF4520B series of dual binary counters produced by NXP Semiconductors. It is designed for general-purpose digital logic applications requiring reliable synchronous counting operations. The device integrates clamp diodes on its inputs, facilitating direct interfacing with voltages exceeding the supply rail when used with current limiting resistors.

Counter Dividers Replacement Considerations

HEF4520BT

Counter Dividers FAQ

How does the HEF4520BP,652 handle clock inputs?

Each counter has two clock inputs: nCP0 triggers on LOW-to-HIGH transitions if nCP1 is HIGH, and nCP1 triggers on HIGH-to-LOW transitions if nCP0 is LOW. Either input can function as the clock while the other serves as an enable.

What is the function of the nMR input?

The nMR pin is an active HIGH asynchronous master reset input. When asserted, it resets all outputs (nQ0 to nQ3) to LOW independently of the clock inputs.