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Full custom digital ic design of priority encoder
The document discusses the full custom digital IC design of priority encoders 74LS147 and 74LS148, detailing the functions of encoders and the specific characteristics of priority encoders that output the active input with the highest priority. It includes specifications, functional block diagrams, layout information, and applications of the encoders, as well as future scope with the development of a 16-to-4 priority encoder. Key specifications such as technology, supply voltage, area, and power consumption are compared for both encoders.
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Full custom digital ic design of priority encoder
- 1. Full Custom DigitalIC Design of Priority Encoder 74LS 147 & 148 Team members Bhargav-l401 Srikanth-452 Venkatesh-459 Vishesh Thakur Singh-460
- 2. What isan “Encoder” • An encoder is a device or a combinational circuit that converts information from one format or code to another. • Digital Encoder are more commonly called a Binary Encoder takes all its data inputs one at a time and then converts them into a single encoded output. • An "n-bit" binary encoder has 2n input lines and n- bit output lines
- 3. 4 to 2encoder
- 4. Priority Encoder: •A priority encoder is a special type of encoder whose output corresponds to the currently active input which has the highest priority. So when an input with a higher priority is present, all other inputs with a lower priority will be ignored.
- 5. Types of PriorityEncoders (a) IC SN54/74 LS147 (b) IC SN54/74 LS148 • 8-to-3 bit priority encoder• 10-to-4 bit priority encoder
- 6. 8 to 3priority encoder
- 7. Functional Block Diagramof 74LS148 • Output A0=∑(1,3,5,7) • Output A1=∑(2,3,6,7) • Output A2=∑(4,5,6,7)
- 8. 10 to 4priority encoder 10 X 4 Priority Encoder Lowest priority Highest priority D0 D9 Y0 Y1 Y2 Y3
- 9. Functional Block Diagramof 74LS147
- 10. 8 X 3Priority Encoder Schematic View Symbol view
- 11. Verifying Functionality of74LS147
- 12. Schematic view of10 X 4 Priority encoder
- 13.
- 14. Functional Verification of74LS148
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- 17. Applications Keyboard Encoder Interrupt Requests Positional Encoders
- 18.
- 19. Targets achieved S.No: Specifications:Value(74LS148) Value(74LS147) 1. Technology 180nm 180nm 2. Supply (Vdd) 1.8v 1.8v 3. Area 62.26 um. x 283.15 um. 76.97 um. x 279.2 um 4. Power without Parasitics(w) 5.69809658e-07 -1.0852728e-05 5. Power with Parasitics(w) 2.1360425e-06 -8.6488442e-07
- 20. Future Scope • 16-to-4Priority Encoder:- As many as 16 interrupts can be serviced based upon their priority
- 21.