MC74HC4046AFEL

Clock Generators, PLLs, Frequency Synthesizers Overview

The MC74HC4046AFEL is a high-performance silicon-gate CMOS phase-locked loop (PLL) manufactured by onsemi. It integrates three phase comparators, a voltage-controlled oscillator (VCO), and a unity gain operational amplifier (DEMOUT). The device operates within a supply voltage range of 3.0 V to 6.0 V and supports an operating temperature from -55°C to +125°C. Key electrical characteristics include a maximum quiescent current of 80 µA with the VCO disabled and input leakage currents up to 45 µA at 6.0 V. The component is housed in a 16-pin SOEIAJ package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates Phase Comparator 1 (XOR gate), Phase Comparator 2 (edge-sensitive sequential network), and Phase Comparator 3 (RS flip-flop).
• Features a linear Voltage-Controlled Oscillator (VCO) with a center frequency capability up to 13 MHz at 6.0 V.
• Includes a unity gain op-amp buffer (DEMOUT) for accessing the VCO input signal without loading the loop filter.
• Provides an Inhibit input (INH) to disable the VCO and op-amps for minimized standby power consumption.

Clock Generators, PLLs, Frequency Synthesizers Applications

• FM and FSK modulation and demodulation circuits.
• Frequency synthesis and multiplication systems.
• Tone decoding and data synchronization conditioning.
• Voltage-to-frequency conversion and motor speed control.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify that the ordering suffix 'FEL' corresponds to the SOEIAJ-16 package configuration as specified in the manufacturer's ordering information table. Confirm compliance with RoHS directives if lead-free status is required for the specific production batch. Ensure the procurement source provides valid traceability documentation for the semiconductor components.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a single-chip PLL solution with multiple comparator options is required for CMOS logic compatibility. The wide operating voltage range (3.0 V to 6.0 V) allows flexibility in system design. Consider the specific phase detector requirements: PC1 for harmonic rejection, PC2 for zero phase shift lock, or PC3 for edge-triggered operation. Verify external component values for R1, R2, and C1 against the provided performance curves to achieve the desired VCO frequency range.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the 74HC4046A family of high-speed CMOS logic devices. It serves as a functional equivalent to the older MC14046 metal-gate CMOS device but offers improved operating speeds similar to LSTTL standards. The device inputs are compatible with standard CMOS outputs and, with pull-up resistors, LSTTL outputs.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed direct substitutes include the MM74HC4046M and CD74HC4046AM. These alternatives maintain pin compatibility and functional equivalence within the 74HC series specifications.