74HCT4046AM

Clock Generators, PLLs, Frequency Synthesizers Overview

The CD74HCT4046AM is a Phase Locked Loop (PLL) integrated circuit manufactured by Texas Instruments, belonging to the 74HCT series. It features a single PLL circuit with CMOS input and output logic levels. The device operates within a supply voltage range of 4.5V to 5.5V and supports a maximum frequency of 38MHz. It is housed in a 16-SOIC package with a width of 3.90mm and functions across an operating temperature range of -55°C to 125°C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates a linear Voltage-Controlled Oscillator (VCO) for precise frequency generation.
• Includes three distinct phase comparators to support various loop filter configurations.
• Features self-biasing input circuits to maintain small voltage signals within the linear region.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Frequency synthesis systems requiring stable clock generation.
• Motor speed control applications utilizing phase comparison.
• FM demodulation circuits leveraging VCO linearity.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix 'AM' corresponds to the 16-SOIC surface-mount package when sourcing. Confirm that the HCT logic family requirement aligns with the 4.5V to 5.5V supply voltage constraints of the design. Ensure compatibility with the specified industrial temperature range if deployed in harsh environments.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a TTL-compatible interface is required alongside standard 4000-series pinouts. The HCT technology ensures compatibility with 5V CMOS logic families while offering higher switching speeds than legacy HC variants. Consider the SOIC package dimensions for PCB layout constraints compared to DIP alternatives.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part is a member of the 74HCT4046A family, which maintains pin compatibility with the older CD4046B series. It represents the high-speed CMOS technology variant designed for 5V operation. The device serves as a foundational building block for analog and mixed-signal timing circuits in industrial and consumer electronics.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

CD74HC4046AM

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the difference between PC1, PC2, and PC3 in this device?

The device includes three phase comparators: PC1 is an exclusive-OR gate, PC2 is a level-sensitive latch, and PC3 is a edge-triggered flip-flop, each suited for different loop filter requirements.

Can the CD74HCT4046AM operate at voltages below 4.5V?

No, the HCT series specification requires a minimum supply voltage of 4.5V. Lower voltages may result in undefined logic states or failure to meet the 38MHz frequency specification.