FM25C640U Просмотр технического описания (PDF) - Fairchild Semiconductor

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FM25C640U

64K-Bit SPI™ Interface Serial CMOS EEPROM

Fairchild Semiconductor 

FIGURE 1. Synchronous Data Timing Diagram

/CS

Mode 3

SCK

Mode 0

SI

SO

tCSS

tCLH

tCLL

tCSH

tDIS tDIH

Valid Input

tPD

tDH

Valid Output

tCSI

Mode 3

Mode 0

tDF

High Z

FIGURE 2. SPI Protocol

/CS

Mode 3

SCK

SI

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Don't Care

Mode 3

SO

High Z

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

FIGURE 3. HOLD Timing

CS

SCK

Low state ( /CS = 0)

tHDS tHDH

Don't Care

tHDS tHDH

/HOLD

SO

Output (n+2)

SI

Input (n+2)

Output (n+1)

tHZ

Output (n)

Input (n+1)

Input (n)

High Z

Don't Care

tLZ

Output (n)

tDIS

Input (n)

FM25C640U Rev. B

5

www.fairchildsemi.com

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