INDUSTRY COMPONENT

Latch Circuit

A latch circuit is a digital electronic component that maintains its output state until reset, used in sense amplifiers for signal retention.

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Component Specifications

Definition
A latch circuit is a fundamental digital memory element that stores a single bit of data. In sense amplifier applications, it captures and holds the amplified signal from memory cells (like in DRAM or SRAM) during read operations, preventing data loss during subsequent processing. It consists of cross-coupled logic gates (typically NAND or NOR) that create a bistable state, maintaining output even after input changes until a reset signal is applied.
Working Principle
Operates on bistable multivibrator principle using positive feedback. When enabled, it samples the input signal from the sense amplifier and locks it into one of two stable states (high or low). The output remains latched regardless of input changes until a reset or enable signal toggles it. In sense amplifiers, it typically uses SR (Set-Reset) or D-type latch configurations to capture voltage differences amplified from memory cell readings.
Materials
Semiconductor materials (silicon, gallium arsenide), copper/aluminum interconnects, dielectric layers (SiO2, high-k materials), packaging materials (epoxy, ceramic substrates).
Technical Parameters
  • Hold Time 0.3-1.5 ns
  • Setup Time 0.5-2 ns
  • Package Type SOP, QFP, BGA
  • Operating Voltage 1.2V, 1.8V, 3.3V, 5V
  • Power Consumption 0.1-5 mW
  • Propagation Delay 1-5 ns
  • Temperature Range -40°C to 125°C
Standards
ISO 9001, IEC 60747, JEDEC JESD78

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Latch Circuit.

latch circuit sense amplifier latch digital latch SR latch D latch memory interface signal retention electronic component bistable circuit Latch Circuit in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Sense Amplifier

A circuit that detects and amplifies small voltage differences from memory cells to determine stored data values.

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Sense Amplifiers

Electronic circuits that detect and amplify small voltage differences from memory cells to determine stored data values (0 or 1).

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Engineering Analysis

Risks & Mitigation
  • Metastability causing data errors
  • Timing violations due to signal skew
  • Electrostatic discharge damage
  • Thermal degradation at high frequencies
FMEA Triads
Trigger: Insufficient setup/hold time margins
Failure: Incorrect data latching
Mitigation: Implement timing analysis tools, use matched delay lines, and add guard bands in clock distribution
Trigger: Power supply noise or voltage droops
Failure: Unstable latch state or data corruption
Mitigation: Use decoupling capacitors, robust power distribution networks, and voltage regulators
Trigger: Radiation or electromagnetic interference
Failure: Bit flips or soft errors
Mitigation: Implement error-correcting codes, radiation-hardened designs, and shielding

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±5% voltage tolerance, ±0.1 ns timing tolerance, ±10% power consumption tolerance
Test Method
JEDEC JESD78 latch-up test, IEC 60747 semiconductor test, automated test equipment (ATE) for functional and parametric testing

Buyer Feedback

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"The technical documentation for this Latch Circuit is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

What is the difference between a latch and a flip-flop in sense amplifiers?

Latches are level-sensitive and transparent when enabled, while flip-flops are edge-triggered. In sense amplifiers, latches are often preferred for faster signal capture during the amplification window, whereas flip-flops provide synchronized timing at clock edges.

How does a latch circuit improve sense amplifier performance?

It prevents data corruption by holding the amplified signal stable during subsequent operations, reduces timing constraints, and enables asynchronous read operations in memory systems.

What are common failure modes of latch circuits in industrial applications?

Metastability issues, setup/hold time violations, leakage current in low-power modes, and electromigration in interconnects under high-frequency operation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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