Data Input (D): Power Supply 3.3V or 5V DC

Component Specifications

Definition

The Data Input (D) in D-Type Flip-Flops is a critical digital logic component that receives and holds binary data signals (0 or 1) at the input terminal, which gets transferred to the output on the rising or falling edge of the clock signal. In industrial applications, it serves as the primary data entry point for sequential logic circuits, ensuring synchronized data processing in automation controllers, PLCs, and digital signal processors.

Working Principle

Operates on edge-triggered synchronization where the D input value is sampled at the active clock edge (typically rising edge). When the clock transitions from low to high, the binary state present at the D input is transferred to the Q output and maintained until the next active clock edge, regardless of subsequent changes at the D input. This creates a one-clock-cycle delay element essential for data pipelining and sequential logic operations.

Materials

Semiconductor silicon with doped regions for transistor formation, aluminum or copper interconnects, silicon dioxide insulation, ceramic or plastic packaging (DIP, SOIC, QFP), gold bonding wires.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Power Supply	3.3V or 5V DC
Hold Time (th)	5ns typical
Clock Frequency	50MHz max
Setup Time (tsu)	20ns typical
Input Capacitance	5pF typical
Operating Temperature	-40°C to +85°C
Input Voltage Low (VIL)	0.8V max (5V supply)
Propagation Delay (tpd)	15ns max
Input Voltage High (VIH)	2.0V min (5V supply)

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 JESD78, MIL-STD-883

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

Metastability from setup/hold time violations
Signal integrity issues from long traces
Electrostatic discharge damage
Clock skew causing data corruption
Power supply noise affecting input thresholds

FMEA Triads

Trigger: Insufficient setup time before clock edge
Failure: Metastable output causing system crashes
Mitigation: Implement proper timing analysis, add synchronizer chains for asynchronous inputs

Trigger: ESD events on input pins
Failure: Permanent gate oxide damage leading to leakage
Mitigation: Incorporate ESD protection diodes, follow proper handling procedures

Trigger: Ground bounce during simultaneous switching
Failure: False triggering and data errors
Mitigation: Use decoupling capacitors, optimize PCB layout with solid ground planes

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±10% voltage thresholds, ±20% timing parameters across temperature range

Test Method

Automated test equipment with parametric measurement, boundary scan testing (JTAG), high-speed digital pattern generation, temperature cycling from -40°C to +125°C

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

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Data Input (D)

Manufacturer profiles associated with Data Input (D).

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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 is the difference between D input and other flip-flop inputs?

The D input is the sole data input in D-type flip-flops, unlike JK or SR flip-flops which have multiple control inputs. It directly determines the output state on clock edges without requiring complementary inputs.

Can D input be left floating in industrial circuits?

No, D inputs must never be left unconnected as floating inputs can cause unpredictable switching and increased power consumption. They should be tied to VCC or GND through pull-up/pull-down resistors if not actively driven.

How does setup time affect D input operation?

Setup time is the minimum period the D input signal must be stable before the active clock edge to ensure reliable data capture. Violating setup time can cause metastability and data corruption in industrial control 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.

Data Input (D)