25lc040a Microchip Technology Inc., 25lc040a Datasheet - Page 7

• Manufacturer Part Number: 25lc040a
• Description: 4k Spi Bus Serial Eeprom
• Manufacturer: Microchip Technology Inc.

BLOCK DIAGRAM
TABLE 2-1:
FIGURE 2-1:
© 2007 Microchip Technology Inc.
HOLD
Instruction Name
Note:
SCK
WP
SO
CS
SCK
SI
CS
SO
SI
WRITE
I/O Control
READ
WRDI
WREN
RDSR
WRSR
STATUS
Register
Logic
x = don’t care.
A
8
0
0
is the 9
Instruction+Address MSb
1
0
INSTRUCTION SET
V
V
0
CC
2
SS
th
READ SEQUENCE
Memory
Control
Logic
address bit, which is used to address the entire 512 byte array.
3
0
Instruction Format
0000 A
0000 A
0000 x100
0000 x110
0000 x101
0000 x001
A
4
8
Dec
5
0
X
High-impedance
6
1
8
8
Sense Amp.
R/W Control
011
010
Y Decoder
HV Generator
Page Latches
1
7
EEPROM
A
Array
8
7
A
9 10 11
Lower Address Byte
6
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
A
5
A
4
12 13 14 15 16 17 18 19 20 21 22 23
A
25AA040A/25LC040A
3
A
2
A
1
A
0
Description
7
6
5
Data Out
4
3
2
DS21827E-page 7
1
0