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Interfacing External Memory

Interfacing External Memory. Rajiv Nandivada. High Level Schematic. Clock cycle of 10-20 ns (Depending on its use). 3.3 V CMOS SRAM (128 x 8 bit).

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Interfacing External Memory

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  1. Interfacing External Memory Rajiv Nandivada

  2. High Level Schematic • Clock cycle of 10-20 ns (Depending on its use). • 3.3 V CMOS SRAM (128 x 8 bit). • Uses multiplexed address and data bus to reduce the number of port pins. The lower address bits are held in latch while the data is transferred.

  3. Functional Block Diagram of SRAM • Single 3.3 V supply. • Lower power consumption via chip deselect. • Available in 32 pin Plastic SOJ, and 32 pin Type II TSOP packages.

  4. Truth Table

  5. Pin Configuration SOJ and TSOP Top View SOJ: Small Outline J Leads TSOP: Thin Small Outline Package

  6. Characteristics

  7. Timing Diagrams Read cycle: Write cycle:

  8. Major Manufacturers of SRAM • Alliance, • Brilliance • Crosslink • Cypress Semiconductor • Dense-PAC Micro • Etron Technology • Eureka • Hitachi • IBM • IDT • Mitsubishi • NEC • Samsung • Seiko Epson • Sharp • Sony • Toshiba

  9. Electrically Erasable Programmable Read-only Memory (EEPROM)

  10. Erasable Programmable Read-only Memory (EPROM)

  11. Flash Memory

  12. I2C(Inter IC) Bus SDA: Serial Data Line SCL: Serial Clock Line

  13. Packaging • SOJ or Small Outline J-lead • TSOP or Thin Standard Outline Package • DIP or Dual Inline Package • ZIP or Zigzag Inline Package • PLCC or Plastic Leaded Chip Carrier

  14. Packaging Contd.. • SOJ or Small Outline J-lead • TSOP or Thin Standard Outline Package • DIP or Dual Inline Package • ZIP or Zigzag Inline Package • PLCC or Plastic Leaded Chip Carrier

  15. Pricing Depends on • The type of package it comes in (DIP, SOJ, TSOP) • The speed of the memory. • The market value. • The vendor (Digikey, Jameco) • Storage capacity( 128K X 8, 256K X 8) • The type of memory (Flash, EEPROM)

  16. References • www.cygnal.com • www.digikey.com • www.srams.co.uk • www.jameco.com • www.atmel.com • www.xicor.com

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