CD74HCT4046AMT

Overview

The CD74HCT4046AMT is a high-speed CMOS logic phase-locked loop (PLL) integrated circuit manufactured by Texas Instruments. It belongs to the 74HCT series and features a single PLL circuit with an integrated voltage-controlled oscillator (VCO). 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-TSSOP surface-mount package with a width of 4.4mm. The component functions across an extended industrial temperature range from -55°C to +125°C, ensuring reliable performance in demanding electronic applications.

Feature Summary

• Integrates a linear voltage-controlled oscillator (VCO) for precise frequency generation.
• Includes three distinct phase comparators (PC1, PC2, and PC3) for flexible loop configurations.
• Features self-biasing input circuits designed to maintain small voltage signals within the linear region of the input amplifier.

Applications

• Frequency synthesis systems requiring stable clock generation.
• Motor control loops utilizing phase comparison for speed regulation.
• FM demodulation circuits leveraging the VCO characteristics.

Procurement Notes

Verify the specific suffix 'MT' against the manufacturer's official documentation to confirm the tape-and-reel packaging configuration and pinout compatibility. Ensure that the 74HCT logic family voltage requirements align with the target system design, as this differs from standard HC series specifications.

Selection Notes

Select this component when a 5V-only supply environment is present, as the HCT series requires a strict 4.5V to 5.5V operating range. Choose the TSSOP-16 package for space-constrained surface-mount designs. Consider the HC variant if a wider 2V to 6V supply range is necessary for the application.

Part Context

This part is a member of the Texas Instruments 74HCT4046A family, which provides pin-compatible alternatives to the legacy CD4046B. The HCT designation indicates compatibility with standard TTL logic levels while maintaining CMOS power efficiency. The AMT suffix specifically denotes the surface-mount TSSOP package variant within this product line.

Replacement Considerations

CD74HC4046AMT

FAQ

What are the available phase comparator options?

The CD74HCT4046AMT includes three phase comparators: PC1 (exclusive-OR type), PC2 (edge-triggered type), and PC3 (digital type).

How does the device handle small input signals?

It utilizes a self-biasing input circuit that keeps small voltage signals within the linear region of the input amplifier, allowing for direct or capacitive coupling.