CD54HC4046AF3A

Overview

The CD54HC4046AF3A is a high-speed silicon-gate CMOS phase-locked loop (PLL) integrated circuit manufactured by Texas Instruments. It operates within a supply voltage range of 2V to 6V for the digital section and 3V to 6V for the VCO section, supporting an operating temperature range from -55°C to 125°C. The device features a linear voltage-controlled oscillator (VCO) and three distinct phase comparators: Exclusive-OR (PC1), Edge-Triggered JK Flip-Flop (PC2), and Edge-Triggered RS Flip-Flop (PC3). It is housed in a 16-lead ceramic dual in-line package (CERDIP).

Feature Summary

• Integrates a linear voltage-controlled oscillator (VCO) with excellent frequency linearity achieved through linear op-amp techniques.
• Provides three selectable phase comparators: PC1 (Exclusive-OR), PC2 (Edge-Triggered JK Flip-Flop), and PC3 (Edge-Triggered RS Flip-Flop).
• Includes a VCO-inhibit control input to enable ON/OFF keying and minimize standby power consumption.
• Features a self-bias input circuit that maintains small voltage signals within the linear region of the input amplifiers.

Applications

• FM Modulation and Demodulation
• Frequency Synthesis and Multiplication
• Tone Decoding
• Data Synchronization and Conditioning

Procurement Notes

Verify the complete part number CD54HC4046AF3A to ensure correct identification of the HC logic family variant and CERDIP packaging. Confirm compliance with JEDEC standard number 7 specifications. Ensure electrostatic discharge handling procedures are followed during installation due to component sensitivity.

Selection Notes

Select this component when a robust ceramic package is required for harsh environments or high reliability applications. The HC series offers wide supply voltage flexibility compared to HCT variants. Verify that the specific phase comparator requirements align with the available PC1, PC2, or PC3 options before finalizing the design.

Part Context

This component belongs to the CD54/CD74HC4046A and CD54/CD74HCT4046A family of high-speed CMOS PLLs. It serves as a pin-compatible upgrade to the older CD4046B devices while offering significantly reduced power dissipation compared to LSTTL logic ICs. The '54' prefix indicates military-grade temperature ranges and reliability standards.

Replacement Considerations

Direct pin-compatible replacements include other variants within the same family such as CD74HC4046AE (PDIP) or CD74HC4046AM (SOIC). For lower voltage digital interfaces, consider the HCT versions like CD54HCT4046AF3A, noting the restricted 4.5V to 5.5V supply requirement.