CD74HCT7046AE

Overview

The CD74HCT7046AE is a Phase Locked Loop (PLL) integrated circuit manufactured by Harris Corporation. It operates on a single supply voltage ranging from 2V to 6V and supports a maximum frequency of 38MHz. The device is housed in a 16-DIP package with a pin pitch of 0.300 inches (7.62mm). It functions as a complete PLL system, integrating a voltage-controlled oscillator (VCO), phase detector, and reference divider. The component is designed for through-hole mounting and is rated for an operating temperature range of -55°C to 125°C.

Feature Summary

• Integrates a wide-range voltage-controlled oscillator (VCO) capable of covering multiple frequency bands within the specified operational limits.
• Includes a built-in phase comparator and reference frequency divider for precise frequency synthesis and locking applications.
• Features a lock detect output signal to indicate when the loop has achieved synchronization.

Applications

• Frequency synthesizers for communication systems
• Motor speed control circuits
• FM demodulation stages

Procurement Notes

Verify the specific suffix 'AE' against the manufacturer's datasheet to confirm the exact temperature grade and packaging variant. Confirm RoHS compliance status as older Harris components may not meet current environmental directives. Check for obsolescence or lifecycle status before finalizing procurement plans.

Selection Notes

Select this component when a CMOS-compatible PLL with a wide VCO tuning range is required. Ensure the input logic levels match the HCT series specifications for compatibility with standard TTL-driven systems. Verify that the 38MHz maximum frequency meets the application's bandwidth requirements.

Part Context

This part belongs to the 74HC/HCT family of logic devices, specifically adapted for analog-mixed signal PLL functions. It serves as a direct replacement for earlier 4046-series designs but offers improved switching speeds and noise immunity characteristic of the HC/HCT technology node.

Replacement Considerations

Compatible substitutes include the CD74HC7046 series for HC-level performance or the NXP/Philips 74HCT7046AN. Verify pinout compatibility and electrical parameter equivalence before substitution.