25LC1024-I/ST Microchip Technology, 25LC1024-I/ST Datasheet - Page 10

• Manufacturer Part Number: 25LC1024-I/ST
• Description: IC, EEPROM, 1MBIT, SERIAL, 20MHZ TSSOP-8
• Manufacturer: Microchip Technology

Specifications of 25LC1024-I/ST

• Memory Size: 1Mbit
• Ic Interface Type: SPI
• Clock Frequency: 20MHz
• Supply Voltage Range: 2.5V To 5.5V
• Memory Case Style: TSSOP
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Memory Configuration: 128K X 8

25LC1024
2.3
The 25LC1024 contains a write enable latch. See
Table 2-4 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 2-4:
FIGURE 2-5:
DS22064C-page 10
Write Enable (WREN) and Write
Disable (WRDI)
WRITE ENABLE SEQUENCE (WREN)
WRITE DISABLE SEQUENCE (WRDI)
SCK
CS
SO
SCK
SI
CS
SO
SI
0
0
0
0
0
1
0
1
High-Impedance
0
High-Impedance
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
• PE instruction successfully executed
• SE instruction successfully executed
• CE instruction successfully executed
0
0
4
4
1
5
1
5
1
6
1 0
6
0
7
0
7
© 2008 Microchip Technology Inc.