CD74HCT4046AEG4

Overview

The CD74HCT4046AEG4 is a Phase Lock Loop (PLL) integrated circuit manufactured by Texas Instruments. It belongs to the 74HCT logic series and features a single PLL circuit with CMOS input and output 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-DIP package with a width of 0.300 inches (7.62mm) for through-hole mounting. The component functions across an extended temperature range from -55°C to 125°C.

Feature Summary

• Integrates a linear voltage-controlled oscillator (VCO) and three distinct phase comparators for flexible loop configuration.
• Features signal inputs capable of direct coupling with large voltage signals or indirect coupling via series capacitors for small voltage signals.
• Includes a self-biasing input circuit designed to maintain small voltage signals within the linear region of the input amplifier.

Applications

• Frequency synthesis circuits
• Clock recovery systems
• Motor speed control applications

Procurement Notes

Verify current availability status as the CD74HCT4046AEG4 is listed as discontinued by major distributors. Confirm functional equivalence with recommended substitutes such as the CD74HCT4046AE before finalizing procurement plans. Ensure that ordering suffixes do not imply functional changes unless explicitly documented in official manufacturer specifications.

Selection Notes

Select this component when HCT logic compatibility with TTL inputs is required alongside PLL functionality. The 74HCT series offers faster switching speeds compared to standard 74HC devices while maintaining CMOS power efficiency. Verify that the 4.5V to 5.5V supply voltage range aligns with the system design constraints.

Part Context

This part is a variant of the CD74HCT4046A, distinguished by the 'G4' suffix indicating lead-free and RoHS-compliant packaging. It is pin-compatible with the older CD4046B series, facilitating upgrades in existing designs. The device is part of the broader 74HCT family, which bridges the performance gap between HC and HSTT logic families.

Replacement Considerations

The CD74HCT4046AE is identified as a recommended substitute. Verify package compatibility and ensure the absence of the 'G4' suffix does not affect compliance requirements if lead-free status is mandatory.

FAQ

What are the available phase comparators in the CD74HCT4046AEG4?

The device integrates three different phase comparators: PC1, PC2, and PC3, allowing for various loop filter configurations.

How does the input circuit handle small voltage signals?

It employs a self-biasing input circuit that keeps small voltage signals within the linear region of the input amplifier, often coupled indirectly through a series capacitor.

Is the CD74HCT4046AEG4 compatible with the CD4046B?

Yes, the CD74HCT4046A is pin-compatible with the CD4046B, allowing for direct replacement in many legacy designs.