CD74HC297EG4

Overview

The CD74HC297EG4 is a high-speed CMOS logic device manufactured by Texas Instruments, housed in a 16-pin plastic DIP package. It functions as a digital phase-locked-loop filter containing a phase-frequency detector and a voltage-controlled oscillator (VCO) clock divider. The component operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -55°C to 125°C. Key electrical specifications include a maximum low-level output current of 5.2 mA and a maximum high-level output current of 5.2 mA. The device features unidirectional control with low-enable functionality and is designed for applications requiring precise digital PLL filtering.

Feature Summary

• Integrates a phase-frequency detector and a programmable divide-by-N counter for digital PLL implementation
• Provides high-speed CMOS performance with robust noise immunity and low power consumption
• Features three-state outputs compatible with bus-driven systems
• Supports wide industrial temperature ranges for reliable operation in harsh environments

Applications

• Digital phase-locked-loop filter circuits
• Frequency synthesis systems
• Clock recovery circuits
• Modem and communication equipment

Procurement Notes

Verify the specific EG4 suffix indicates lead-free packaging and RoHS compliance when sourcing. Confirm the 16-PDIP package dimensions match your PCB footprint requirements. Ensure the supply voltage provided to the circuit remains within the 2 V to 6 V operational limits to prevent device malfunction or damage during procurement validation.

Selection Notes

Select this component when a complete digital PLL solution is required without external analog compensation. Compare propagation delay characteristics against system timing constraints. Verify that the 5.2 mA drive capability meets the load requirements of downstream logic gates. Consider the 16-pin DIP form factor if through-hole assembly is mandated by the manufacturing process.

Part Context

This part belongs to the Texas Instruments 74HC series of high-speed CMOS logic devices. The 74HC family is known for pin compatibility with low-power Schottky TTL while offering superior speed and lower power dissipation. The CD74HC297 variant specifically addresses complex frequency control needs by integrating multiple PLL functions into a single monolithic IC.

Replacement Considerations

The HEF47297P from NXP Semiconductors is a pin-compatible alternative. Verify electrical parameter alignment before substitution. Ensure the replacement maintains the same 16-pin DIP package configuration and voltage tolerance levels for direct board integration.