MM74HC4046M

Overview

The MM74HC4046M is a low-power CMOS Phase-Locked Loop (PLL) manufactured by onsemi, housed in a 16-lead Small Outline Integrated Circuit (SOIC). It integrates a linear Voltage-Controlled Oscillator (VCO), a source follower, and three distinct phase comparators. The device operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range of -40°C to +85°C. At 4.5 V, the maximum VCO frequency reaches 12 MHz, with comparator response times as fast as 25 ns.

Feature Summary

• Integrates a low-power linear VCO, source follower, and three phase comparators (XOR, edge-sensitive, SR flip-flop).
• Maximum VCO operating frequency of 12 MHz at VCC = 4.5 V.
• Fast comparator response times: 25 ns for Comparator I and III, 30 ns for Comparator II.
• Self-biasing signal input allows direct coupling of logic levels or capacitive coupling of small signals.

Applications

• Frequency synthesis circuits utilizing external prescalers.
• FM demodulation using the source follower output.
• Clock recovery systems requiring specific phase detector characteristics.

Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm package marking matches the M16A SOIC specification. Check datasheet revisions for any updates to electrical parameters or ordering information prior to final design implementation.

Selection Notes

Select this component when a single-chip PLL solution with multiple phase detector options is required. Ensure the application voltage stays within the 2 V to 6 V range. Consider the specific phase comparator needs: Comparator I for simple XOR detection, Comparator II for zero-phase-lock accuracy, or Comparator III for pulse-based inputs.

Part Context

This part belongs to the 74HC4046 family of high-speed CMOS logic devices. It serves as a successor to older metal-gate CMOS variants like the CD4046, replacing internal Zener diodes with an additional phase comparator for enhanced functionality while maintaining pin compatibility.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pinout and electrical parameter compatibility if considering alternatives from other manufacturers such as Texas Instruments or NXP.