Priority Logic Array Component for Priority Decoders

Product Specifications

Technical details and manufacturing context for Priority Logic Array

Definition

The Priority Logic Array is a core sub-component of a Priority Decoder, an electronic circuit used in digital systems to resolve contention when multiple input signals request service simultaneously. It systematically evaluates all input lines, identifies the one with the highest assigned priority, and generates a corresponding binary code output. This enables orderly processing in systems like interrupt controllers, bus arbiters, and keyboard encoders. The array consists of interconnected logic gates (typically AND, OR, and NOT gates) arranged to implement a predetermined priority scheme. When multiple inputs are active (e.g., logic high), internal logic propagates a 'disable' signal from higher-priority inputs to lower-priority ones, ensuring only the highest-priority input's code is passed to the output. This is often achieved through a cascading or daisy-chain structure. The component is fabricated on a silicon semiconductor substrate with copper interconnects and dielectric insulation. It operates with a supply voltage of 3.3–5 V, input high voltage of 2–5.5 V, and input low voltage of 0–0.8 V. Propagation delay is typically 5–15 ns. It is rated for industrial temperature range (-40 to 85 °C) and storage from -55 to 125 °C. Input leakage current is ±1 µA, output current is ±24 mA, power dissipation is 10–50 mW at 5 V, and input capacitance is 3–10 pF. The component is offered in a SOIC-16 surface mount package (JEDEC MS-012) and features 8 inputs with tri-state outputs for bus interfacing. As a directory listing, these parameters are reference ranges; actual values must be confirmed with the manufacturer for the specific model. The Priority Logic Array is a passive component in the sense that it does not contain software; its behavior is fixed by hardware logic. It is not a complete priority decoder but a sub-component, so it requires external connections to form a full decoder. For procurement, verify the exact logic family, pinout, and timing specifications with the supplier.

Working Principle

The array consists of interconnected logic gates (typically AND, OR, and NOT gates) arranged to implement a predetermined priority scheme. When multiple inputs are active (e.g., logic high), internal logic propagates a 'disable' signal from higher-priority inputs to lower-priority ones, ensuring only the highest-priority input's code is passed to the output. This is often achieved through a cascading or daisy-chain structure.

Common Materials

Silicon (Semiconductor substrate), Copper (Interconnects), Dielectric material (Insulation)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Supply Voltage	3.3–5 V	Operating range for standard logic levels
Input Voltage High	2–5.5 V	Minimum high-level input voltage
Input Voltage Low	0–0.8 V	Maximum low-level input voltage
Propagation Delay	5–15 ns	Typical delay from input to output
Operating Temperature	-40–85 °C	Industrial temperature range
Storage Temperature	-55–125 °C	Non-operating storage range
Input Current	±1 µA	Leakage current at input pins
Output Current	±24 mA	Maximum sink/source current
Power Dissipation	10–50 mW	Typical power consumption at 5 V
Input Capacitance	3–10 pF	Typical input pin capacitance
Package Type	SOIC-16	Surface mount packageJEDEC MS-012
Number of Inputs	8	Priority encoder with 8 inputs
Output Type	3-state	Tri-state outputs for bus interfacing

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

Components / BOM

Input Buffer Stage Part
Conditions and standardizes the incoming digital signals to the logic levels required by the core array.

Material: Semiconductor (Transistors)
Core Logic Gate Network Part
The interconnected AND, OR, and NOT gates that physically implement the priority evaluation and encoding algorithm.

Material: Semiconductor (Transistors)
Output Driver Stage
Amplifies the weak logic signals from the core network to drive the output lines of the decoder.

Material: Semiconductor (Transistors)

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Priority Decoder

View system integration details

Manufacturers of Priority Logic Array

Manufacturer profiles associated with Priority Logic Array.

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Frequently Asked Questions

What is the function of a Priority Logic Array?

It determines which active input has the highest priority and generates a binary code for that input, suppressing lower-priority inputs.

What are the typical supply voltage and temperature ranges?

Supply voltage is 3.3–5 V, operating temperature is -40 to 85 °C, and storage temperature is -55 to 125 °C. Confirm exact limits with the manufacturer.

What package is available?

The component is offered in a SOIC-16 surface mount package (JEDEC MS-012). Verify pinout and mechanical drawings with the supplier.

How many inputs does it support?

It supports 8 inputs and provides tri-state outputs for bus interfacing. Check the datasheet for input/output logic levels.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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voltage:	3.3V to 5V typical, with absolute maximum ratings specified per datasheet
temperature:	-40°C to +85°C (industrial grade), -55°C to +125°C (military grade)
signal frequency:	Up to 100 MHz for standard CMOS/TTL implementations
power dissipation:	Typically < 100 mW, depends on technology and load

Priority Logic Array

Product Specifications

Applied To / Applications

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