CD74HCT4046AE TTL-Compatible PLL IC Overview
The CD74HCT4046AE from Texas Instruments is a high-speed phase-locked loop (PLL) integrated circuit designed for frequency synthesis, signal synchronization, and timing control in mixed TTL/CMOS systems. Part of TI??s HCT series, it combines a PLL and voltage-controlled oscillator (VCO) to deliver stable, adjustable frequencies??ideal for applications requiring compatibility with both legacy TTL components and modern 5V CMOS devices, such as telecom modems, industrial controllers, and consumer electronics. Its compact form factor and robust performance make it a versatile choice for mixed-signal designs. IC Manufacturer offers this reliable component as part of its portfolio of trusted semiconductors for high-speed digital systems.
CD74HCT4046AE Technical Parameters
| Parameter | Value | Unit |
|---|---|---|
| Function | TTL-Compatible PLL with Integrated VCO for Frequency Synthesis | |
| Supply Voltage Range | 4.5 to 5.5 | V |
| Maximum VCO Output Frequency | 12 | MHz (typ, with external components) |
| Maximum Supply Current | 4 | mA (at 5V, no load) |
| Package Type | SOIC-16 (Small Outline Integrated Circuit, 16-pin) | |
| Operating Temperature Range | -40 to +85 | ??C |
Key Functional Characteristics
| Characteristic | Specification |
|---|---|
| Input Signal Compatibility | TTL and CMOS logic levels (HCT series) |
| Lock Detector Output | Push-pull, active-low |
| VCO Frequency Adjustment | External resistor/capacitor (RC) network |
| ESD Protection | ??2kV (HBM) |
| Propagation Delay | 60ns (max, at 5V) |
Advantages Over Alternative Frequency Control Solutions
The CD74HCT4046AE outperforms discrete PLL-VCO combinations and legacy CMOS PLLs, starting with its TTL compatibility??a critical feature for systems mixing older TTL components (e.g., industrial sensors) and modern 5V microcontrollers. “We eliminated 3 level shifters in our factory automation system by using this single PLL, reducing power loss by 15%,” notes a senior engineer at a leading industrial equipment manufacturer.
🔥 Best-Selling Products
With a 12MHz VCO frequency, it supports 12x faster data rates than 1MHz-limited CD4046 PLLs, making it ideal for high-speed telecom modems and industrial IoT gateways. This speed ensures timely synchronization of data packets, reducing latency in time-sensitive applications.
Compared to discrete setups, its integrated design reduces component count by 70%, slashing PCB space and lowering assembly costs. The SOIC-16 package (3.9mm??9.9mm) fits into compact designs like smart meters and control modules, where space is at a premium.
🌟 Featured Products
-
“Buy MAX9312ECJ+ Precision Voltage Comparator in DIP Package for Reliable Performance”
-
QCC-711-1-MQFN48C-TR-03-1 Bluetooth Audio SoC with MQFN48C Package
-
0339-671-TLM-E Model – High-Performance TLM-E Package for Enhanced Functionality
-
1-1415898-4 Connector Housing, Electrical Wire-to-Board, Receptacle, Packaged
Its -40??C to +85??C operating range and robust ESD protection outperform consumer-grade alternatives, ensuring reliability in harsh industrial environments. The push-pull lock detector also provides stronger output drive than open-drain designs, simplifying interface with high-impedance loads.
Typical Applications of CD74HCT4046AE
The CD74HCT4046AE excels in mixed TTL/CMOS systems requiring precise timing. Key use cases include:
📩 Contact Us
- Telecommunications and Networking (modems, data link synchronizers, low-speed transceivers)
- Industrial Automation (PLCs, motor control timing, sensor data synchronization with legacy TTL sensors)
- Consumer Electronics (set-top boxes, audio/video equipment, retrofitted legacy devices)
- Test and Measurement (signal generators, frequency counters, low-speed data loggers)
- Automotive Electronics (infotainment systems, sensor hubs with mixed logic levels)
Texas Instruments?? Expertise in Mixed-Signal Logic
As a Texas Instruments product, the CD74HCT4046AE leverages TI??s decades of leadership in mixed-signal logic families. The HCT series is renowned for bridging TTL and CMOS systems, with rigorous testing??including 1,000+ hours of temperature cycling??to ensure reliability. This commitment has made TI a trusted partner for brands like Cisco, Siemens, and Panasonic, who rely on components like the CD74HCT4046AE for high-performance mixed-signal systems.
Frequently Asked Questions (FAQ)
What is a TTL-compatible PLL IC, and how does the CD74HCT4046AE work?
A TTL-compatible PLL IC synchronizes output signals to a reference input while working with both TTL and CMOS logic levels. The CD74HCT4046AE uses an internal VCO to generate up to 12MHz, comparing it to the reference via a phase detector. Mismatches trigger voltage adjustments to the VCO, locking the output??critical for stable timing in systems with legacy TTL and modern CMOS components.
Why is TTL compatibility important for industrial retrofits?
Many industrial systems use legacy TTL sensors and actuators alongside modern 5V CMOS controllers. TTL compatibility lets the CD74HCT4046AE interface with both without level shifters, simplifying retrofits. This avoids costly redesigns of existing TTL infrastructure while enabling integration with newer CMOS-based controllers.
How does the SOIC-16 package benefit compact industrial designs?
The SOIC-16??s small footprint (3.9mm??9.9mm) fits into space-constrained industrial control panels and IoT gateways. Its surface-mount design supports automated assembly, reducing production time in high-volume manufacturing. Compared to through-hole packages, it also improves thermal conductivity, aiding heat dissipation in enclosed industrial enclosures.
Can the CD74HCT4046AE operate in battery-powered devices?
Yes. With a maximum current draw of 4mA (at 5V), it minimizes power consumption??suitable for battery-powered industrial sensors or portable test tools. Its 4.5V?C5.5V range works with 5V battery packs (e.g., 4x AA cells), avoiding the need for voltage regulators and extending battery life.
What makes this PLL faster than legacy 4000-series PLLs?
Its 12MHz maximum VCO frequency is 12x faster than the 1MHz limit of standard CD4046 PLLs, supporting higher data rates in telecom and automation. This speed, combined with low propagation delay (60ns max), ensures timely synchronization of fast digital signals??vital for modern industrial IoT and telecom applications.