INDUSTRY COMPONENT

AND Gate (Reset Logic)

AND Gate (Reset Logic) is a digital logic component in Phase-Frequency Detectors that ensures proper reset timing by requiring all input conditions to be met before resetting the PFD state.

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Component Specifications

Definition
The AND Gate (Reset Logic) is a critical digital logic component within Phase-Frequency Detector (PFD) circuits, specifically designed to implement the reset function. It receives multiple input signals (typically from the PFD's UP and DOWN outputs) and generates a reset pulse only when all input conditions are simultaneously satisfied. This ensures precise timing synchronization between phase and frequency comparisons, preventing false resets and maintaining stable PLL (Phase-Locked Loop) operation.
Working Principle
The AND Gate operates on Boolean logic principles where the output is HIGH (logic 1) only when all inputs are HIGH simultaneously. In PFD applications, it monitors the UP and DOWN signals from the phase comparator. When both signals become active (indicating a phase difference has been detected and processed), the AND gate outputs a reset pulse that clears the PFD's internal state, allowing it to begin the next comparison cycle. This creates a dead zone that prevents chatter and ensures linear PFD operation.
Materials
Semiconductor materials (typically silicon), with CMOS or TTL technology implementations. Package materials include ceramic or plastic encapsulation with gold or copper lead frames.
Technical Parameters
  • Package Type SOIC-14, TSSOP-14
  • Supply Voltage 3.3V or 5V
  • Power Consumption < 10 mW
  • Propagation Delay 1-5 ns
  • Input Logic Levels CMOS/TTL compatible
  • Operating Temperature -40°C to +85°C
Standards
ISO 9001, IEC 60747, JEDEC JESD78

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for AND Gate (Reset Logic).

AND Gate Reset Logic Phase-Frequency Detector PFD digital logic PLL component timing synchronization reset circuit CMOS logic frequency control AND Gate (Reset Logic) AND Gate (Reset Logic) in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Phase-Frequency Detector (PFD)

A circuit that compares the phase and frequency of two input signals and generates an output signal proportional to their difference.

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Engineering Analysis

Risks & Mitigation
  • Timing violations causing PLL instability
  • Signal propagation delays affecting reset accuracy
  • Power supply noise inducing false resets
  • ESD damage during handling
FMEA Triads
Trigger: Excessive propagation delay
Failure: Missed reset pulses causing PFD deadlock
Mitigation: Use high-speed logic families with verified timing margins
Trigger: Input signal skew
Failure: Premature or delayed resets affecting PLL lock
Mitigation: Implement matched delay paths and proper PCB layout techniques
Trigger: Power supply fluctuations
Failure: False reset triggering
Mitigation: Add decoupling capacitors and voltage regulation

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.5 ns propagation delay tolerance, ±5% voltage threshold variation
Test Method
JEDEC JESD78 latch-up test, IEC 61000-4-2 ESD test, functional testing with pulse generators and oscilloscopes

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the purpose of the AND Gate in PFD reset logic?

The AND Gate ensures that the PFD only resets when both UP and DOWN signals are active, creating a controlled dead zone that prevents false triggering and maintains linear phase detection characteristics.

How does the AND Gate affect PLL performance?

Proper AND Gate implementation eliminates dead zones in the PFD transfer function, reduces phase noise, and improves PLL lock time and stability by ensuring precise reset timing.

Can different logic families be used for the AND Gate in PFD?

Yes, but CMOS is preferred for low power consumption and good noise immunity. TTL can be used but may require level shifting. The choice affects propagation delay and power characteristics.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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