25AA640-I/SN Microchip Technology, 25AA640-I/SN Datasheet - Page 9
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25AA640-I/SN
Manufacturer Part Number
25AA640-I/SN
Description
IC EEPROM 64KBIT 1MHZ 8SOIC
Manufacturer
Microchip Technology
Datasheet
1.25LC640-ESN.pdf
(24 pages)
Specifications of 25AA640-I/SN
Memory Size
64K (8K x 8)
Format - Memory
EEPROMs - Serial
Memory Type
EEPROM
Speed
1MHz
Interface
SPI, 3-Wire Serial
Voltage - Supply
1.8 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (3.9mm Width)
Memory Configuration
8K X 8
Ic Interface Type
SPI
Clock Frequency
1MHz
Supply Voltage Range
1.8V To 5.5V
Memory Case Style
SOIC
No. Of Pins
8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
25AA640-I/SNG
25AA640-I/SNG
25AA640-I/SNG
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
25AA640-I/SN
Manufacturer:
MCP
Quantity:
5 371
Company:
Part Number:
25AA640-I/SN
Manufacturer:
MICROCHIP
Quantity:
12 000
Part Number:
25AA640-I/SN
Manufacturer:
MICROCHI
Quantity:
20 000
3.4
The 25XX640 contains a write enable latch. See
Table 3-3 for the Write-Protect Functionality Matrix.
This latch must be set before any write operation will be
completed internally. The WREN instruction will set the
latch, and the WRDI will reset the latch.
FIGURE 3-4:
FIGURE 3-5:
© 2008 Microchip Technology Inc.
Write Enable (WREN) and
Write Disable (WRDI)
WRITE ENABLE SEQUENCE
WRITE DISABLE SEQUENCE
SCK
SCK
CS
CS
SO
SO
SI
SI
0
0
0
0
0
0
1
1
High-Impedance
High-Impedance
0
0
2
2
0
0
3
3
The following is a list of conditions under which the
write enable latch will be reset:
• Power-up
• WRDI instruction successfully executed
• WRSR instruction successfully executed
• WRITE instruction successfully executed
0
0
4
4
25AA640/25LC640
1
1
5
5
1
1 0
6
6
0
0
7
7
DS21223H-page 9