25AA256 Microchip Technology, 25AA256 Datasheet - Page 7

• Manufacturer Part Number: 25AA256
• Description: 256K SPI Bus Serial EEPROM
• Manufacturer: Microchip Technology

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BLOCK DIAGRAM
TABLE 2-1:
FIGURE 2-1:
© 2007 Microchip Technology Inc.
HOLD
Instruction Name
SCK
WP
SO
CS
SCK
SI
CS
SO
SI
WRITE
I/O Control
READ
WRDI
WREN
RDSR
WRSR
STATUS
Register
Logic
0
0
1
0
INSTRUCTION SET
READ SEQUENCE
V
V
0
CC
2
SS
Instruction
Memory
Control
Logic
3
0
Instruction Format
0000 0011
0000 0010
0000 0100
0000 0110
0000 0101
0000 0001
0
4
Dec
5
0
X
High-Impedance
6
1
Sense Amp.
R/W Control
Y Decoder
HV Generator
Page Latches
1
7
EEPROM
15 14 13 12
Array
8
9 10 11
Read data from memory array beginning at selected address
Write data to memory array beginning at selected address
Reset the write enable latch (disable write operations)
Set the write enable latch (enable write operations)
Read STATUS register
Write STATUS register
16-bit Address
2
21 22 23 24 25 26 27 28 29 30 31
25AA256/25LC256
1
0
Description
7
6
5
Data Out
4
3
DS21822F-page 7
2
1
0