25LC256-E/SM Microchip Technology, 25LC256-E/SM Datasheet - Page 9

• Manufacturer Part Number: 25LC256-E/SM
• Description: IC,SERIAL EEPROM,32KX8,CMOS,SOP,8PIN,PLASTIC
• Manufacturer: Microchip Technology

Specifications of 25LC256-E/SM

• Rohs Compliant: YES
• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 256K (32K x 8)
• Speed: 10MHz
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.4
The 25XX256 contains a write enable latch.
Table 2-1 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:
© 2007 Microchip Technology Inc.
Write Enable (WREN) and Write
Disable (WRDI)
WRITE ENABLE SEQUENCE (WREN)
WRITE DISABLE SEQUENCE (WRDI)
SCK
SO
CS
SI
SCK
SO
CS
SI
0
0
0
0
0
1
0
1
See
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
0
0
4
4
25AA256/25LC256
1
5
1
5
1
6
1 0
6
0
7
0
7
DS21822F-page 9