CD54HC4046AF

Overview

The CD54HC4046AF 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) and is pin-compatible with the CD4046B series.

Feature Summary

• Integrates a linear voltage-controlled oscillator (VCO) with excellent frequency linearity achieved through linear op-amp techniques.
• Provides three selectable phase comparators: Exclusive-OR network, positive edge-triggered JK flip-flop, and positive edge-triggered RS flip-flop.
• Includes a VCO-inhibit control input to enable ON/OFF keying and minimize standby power consumption.
• Features a demodulator output that accurately reflects the VCO input voltage without threshold offset.

Applications

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

Procurement Notes

Verify the complete part number including suffixes when ordering, as they denote specific packaging configurations such as tape and reel or small-quantity reels. Confirm the 16-lead CERDIP package availability matches design requirements. Ensure electrostatic discharge handling procedures are followed during installation due to device sensitivity.

Selection Notes

Select this component for applications requiring wide operating temperature ranges and robust noise immunity typical of HC logic families. Consider the specific phase comparator characteristics; PC2 offers full lock range independent of filter characteristics, while PC1 provides superior noise rejection. Verify input signal coupling methods, as capacitive coupling may be necessary for signals smaller than standard logic levels.

Part Context

This device belongs to the CD54/CD74HC4046A family of high-speed CMOS PLLs. The '54' prefix indicates military-grade temperature specifications (-55°C to 125°C), distinguishing it from commercial '74' variants. It serves as a direct pin-compatible replacement for the older CD4046B series while offering improved speed and lower power consumption compared to LSTTL logic ICs.

Replacement Considerations

Direct pin-compatible replacements include other variants within the CD74HC4046A family, such as CD74HC4046AE (PDIP) or CD74HC4046AM (SOIC), provided the package type change is acceptable. For HCT logic compatibility, the CD54HCT4046AF is available in the same CERDIP package but requires a 4.5V to 5.5V supply voltage.