25C640 Microchip Technology, Inc., 25C640 Datasheet - Page 9

• Manufacturer Part Number: 25C640
• Description: The 25AA640 is a 64K-bit Serial Electrically Erasable Prom With Memory Accessed Via a Simple Serial Peripheral Interface (SPI™) Compatible Serial Bus
• Manufacturer: Microchip Technology, Inc.

FIGURE 3-1:
FIGURE 3-2:
FIGURE 3-3:
2001 Microchip Technology Inc.
CS
SO
SCK
SCK
SCK
CS
CS
SI
SI
SI
SO
CS
SI
0
0
0
0
0
0
7
0
32
1
0
1
0
Instruction
Instruction
0
6
33
2
0
Instruction
2
READ SEQUENCE
BYTE WRITE SEQUENCE
PAGE WRITE SEQUENCE
0
Data Byte 2
5
0
3
34 35 36 37 38 39
0
3
0
0
4
4
0
4
0
3
0
5
High Impedance
0
5
1
2
1
6
High Impedance
1
6
0
0
1
7
1
15 14 13 12
7
15 14 13 12
0
8
15 14 13 12
8
7
40
9 10 11
16 Bit Address
9 10 11
16 Bit Address
6
41 42 43
16 Bit Address
Data Byte 3
5
4
3
44 45
2
21 22 23 24 25 26 27 28 29 30 31
2
2
21 22 23 24 25 26 27 28 29 30 31
2
1
25AA640/25LC640
1
1
46 47
0 7
0
1
0 7
0
6
7
6
7
Data Byte n (32 max)
5
5
6
6
Data Byte 1
Data Byte
4
4
5
5
Data Out
3
3
4
4
2
2
3
3
1
1
2
DS21223E-page 9
2
0
0
1
1
Twc
0
0