25LC128-I/P Microchip Technology Inc., 25LC128-I/P Datasheet - Page 9

• Manufacturer Part Number: 25LC128-I/P
• Description: 128k, 32K X 8 , 2.5V SER EE IND PDIP-8
• Manufacturer: Microchip Technology Inc.

Specifications of 25LC128-I/P

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

2.4
The 25XX128 contains a write enable latch.
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:
© 2007 Microchip Technology Inc.
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
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
25AA128/25LC128
1
5
1
5
1
6
0
6
0
7
0
7
DS21831C-page 9