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Name: GAL20V8QS-25QVI
Brand: National Semiconductor
SKU: GAL20V8QS-25QVI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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National Semiconductor GAL20V8QS-25QVI

Part No.:: GAL20V8QS-25QVI

Manufacturer:: National Semiconductor

Package:: -

Datasheet:: GAL20V8QS-25QVI.pdf

Description:: EE PLD, 25NS, PAL-TYPE PQCC28

In Stock:: 3007

Quantity:: Add To Cart

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GAL20V8QS-25QVI Specifications

Package/Case:
-
Packaging:
Bulk
Series:
*
ProductStatus:
Active
ProgrammableType:
-
DelayTimetpd(1)Max:
-
VoltageSupply-Internal:
-
NumberofLogicElements/Blocks:
-
NumberofMacrocells:
-
NumberofGates:
-
NumberofI/O:
-
OperatingTemperature:
-
MountingType:
-

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GAL20V8QS-25QVI information

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Basic introduction and simple engineering application of GAL20V8QS-25QVI

GAL20V8QS-25QVI is a versatile programmable logic device (PLD) commonly used in digital circuit design. It offers a convenient way to implement custom logic functions, making it ideal for a wide range of applications.

Application Scenario:

In this tutorial, we'll explore a simple application of GAL20V8QS-25QVI in building a 4-bit binary to 7-segment display decoder. This project demonstrates how to utilize the PLD to simplify digital logic design tasks.

Circuit Design:

To design the binary to 7-segment decoder using GAL20V8QS-25QVI, follow these steps:

1. Pin Assignment:

Assign input and output pins on the PLD. For this project, we'll use pins 1-10 as inputs for the 4-bit binary inputs (A0-A3) and pins 11-18 as outputs for driving the segments of the 7-segment display (segment outputs A-G).

2. Truth Table:

Define the truth table mapping the 4-bit binary input to the corresponding segments to be illuminated on the 7-segment display. For example, binary input "0000" corresponds to illuminating segments A, B, C, D, E, F, and binary input "0001" corresponds to illuminating segments B and C.

3. Boolean Equations:

Based on the truth table, derive the Boolean equations for each segment output in terms of the binary inputs. For instance, segment A is illuminated when A3' AND A2' AND A1' AND A0 is true.

4. GAL20V8QS-25QVI Programming:

Using a hardware description language (HDL) or a schematic entry tool, program the GAL20V8QS-25QVI with the derived Boolean equations. Assign the appropriate pin assignments and compile the design into the PLD.

5. Testing:

Once programmed, connect the PLD to a 7-segment display and provide the 4-bit binary inputs. Verify that the segments illuminate correctly according to the truth table and Boolean equations.

Considerations:

- Timing Constraints: Ensure that the propagation delay through the PLD meets the requirements of the application, especially in time-sensitive designs.

- Power Supply: Provide a stable power supply to the GAL20V8QS-25QVI to ensure reliable operation.

- Signal Integrity: Keep signal traces short and minimize noise to maintain signal integrity and prevent erroneous behavior.

- Testability: Implement built-in self-test (BIST) features if necessary to facilitate debugging and testing of the circuit.

- Documentation: Document the design thoroughly, including pin assignments, truth tables, Boolean equations, and test results, for future reference and maintenance.

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6. What is the process for return or replacement of GAL20V8QS-25QVI?

All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the GAL20V8QS-25QVI we delivered, we will accept the replacement or return of the GAL20V8QS-25QVI only when all of the below conditions are fulfilled:

(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.

(2)We are informed of the defect described above within 90 days after the delivery of GAL20V8QS-25QVI.

(3)The PartNo is unused and only in the original unpacked packaging.

Two processes to return the products:

(1)Inform us within 90 days

(2)Obtain Requesting Return Authorizations