Output (Q): Operating Voltage 1.2V to 5.5V

Component Specifications

Definition

The Output (Q) is the primary output terminal of a D-type flip-flop, a fundamental sequential logic component in digital electronics. It holds and outputs the binary state (0 or 1) stored in the flip-flop, which is determined by the Data (D) input at the last active clock edge. This output remains stable until the next clock event, enabling data storage, synchronization, and state retention in registers, counters, and memory elements.

Working Principle

The Output (Q) reflects the state of the internal storage element (typically cross-coupled gates) of the D-type flip-flop. On the rising or falling edge of the clock signal (depending on design), the value present at the Data (D) input is captured and stored. This stored value then appears at Q (and its complement at Q̅, if available) until the next clock edge, providing edge-triggered operation that prevents glitches and ensures reliable data transfer in synchronous systems.

Materials

Semiconductor materials (silicon, gallium arsenide) with metal (aluminum, copper) interconnects; packaged in plastic (epoxy resin) or ceramic (alumina) housings with tin/lead or lead-free solder finishes.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hold Time	0ns to 5ns
Setup Time	1ns to 15ns
Logic Level	0V to Vcc (e.g., 0V/3.3V, 0V/5V)
Output Type	Digital (TTL, CMOS, LVCMOS)
Output Current	Typically 4mA to 24mA (sink/source)
Operating Voltage	1.2V to 5.5V
Propagation Delay	1ns to 20ns (clock-to-Q)
Temperature Range	-40°C to +85°C (industrial), -55°C to +125°C (military)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60747, JEDEC JESD22

Parent Products

This component is used in the following industrial products

D-Type Flip-Flops

Digital storage elements that capture and hold data on clock edges, used in PFDs for phase comparison.

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Engineering Analysis

Risks & Mitigation

Signal integrity degradation due to noise or impedance mismatch
Timing violations (setup/hold time) causing metastability
Overcurrent damage from excessive load
Electrostatic discharge (ESD) susceptibility

FMEA Triads

Trigger: Clock signal jitter or skew
Failure: Incorrect data capture at Output (Q), leading to system errors
Mitigation: Use matched trace lengths, clock buffers, and adhere to timing margins

Trigger: Excessive capacitive load on Output (Q)
Failure: Increased propagation delay or signal distortion
Mitigation: Limit fan-out, use buffer gates, or select flip-flops with higher drive strength

Trigger: Power supply noise or voltage drop
Failure: Unstable Output (Q) levels or logic errors
Mitigation: Implement decoupling capacitors, robust power distribution, and voltage regulation

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Output voltage levels within ±5% of Vcc; timing parameters within ±10% of datasheet values under specified conditions

Test Method

Automated test equipment (ATE) with parametric measurement units (PMUs) for DC tests; high-speed digital testers for timing verification; environmental chambers for temperature cycling

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Supplier transparency

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Manufacturers of Output (Q)

Manufacturer profiles associated with Output (Q).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What does the Output (Q) represent in a D-type flip-flop?

The Output (Q) represents the stored binary state (0 or 1) of the flip-flop, which is the value from the Data (D) input captured at the last active clock edge.

How does Output (Q) differ from Q̅ (Q-bar)?

Output (Q) provides the stored state directly, while Q̅ provides its logical complement (inverse). Both are available in flip-flops with complementary outputs for flexibility in circuit design.

Can Output (Q) change at any time?

No, Output (Q) only changes in response to a clock edge (edge-triggered), ensuring stable output between clock events and preventing race conditions in synchronous systems.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Output (Q)