25LC080A-I/ST Microchip Technology, 25LC080A-I/ST Datasheet - Page 11

• Manufacturer Part Number: 25LC080A-I/ST
• Description: IC EEPROM 8KBIT 10MHZ 8TSSOP
• Manufacturer: Microchip Technology

Specifications of 25LC080A-I/ST

• Memory Size: 8K (1K x 8)
• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Speed: 10MHz
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-TSSOP
• Memory Configuration: 1K X 8 / 512 X 16
• Ic Interface Type: SPI
• Clock Frequency: 10MHz
• Supply Voltage Range: 2.5V To 5.5V
• Memory Case Style: TSSOP
• No. Of Pins: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.6
The Write Status Register instruction (WRSR) allows the
user to write to the nonvolatile bits in the Status
Register as shown in Table 2-2. The user is able to
select one of four levels of protection for the array by
writing to the appropriate bits in the Status Register.
The array is divided up into four segments. The user
has the ability to write-protect none, one, two or all four
of the segments of the array. The partitioning is
controlled as shown in Table 2-3.
The Write-Protect Enable (WPEN) bit is also a
nonvolatile bit that is available as an enable bit for the WP
pin. The Write-Protect (WP) pin and the Write-Protect
Enable (WPEN) bit in the Status Register control the
programmable hardware write-protect feature. Hardware
write protection is enabled when WP pin is low and the
WPEN bit is high. Hardware write protection is disabled
when either the WP pin is high or the WPEN bit is low.
When the chip is hardware write-protected, only writes to
nonvolatile bits in the Status Register are disabled. See
Table 2-4 for a matrix of functionality on the WPEN bit.
FIGURE 2-7:
© 2007 Microchip Technology Inc.
SCK
CS
SO
SI
Write Status Register Instruction
(WRSR)
0
0
WRITE STATUS REGISTER TIMING SEQUENCE (WRSR)
0
1
0
instruction
2
0
3
0
4
0
5
high-impedance
0
6
1
7
See Figure 2-7 for the WRSR timing sequence.
TABLE 2-3:
7
8
BP1
0
0
1
1
6
9
data to Status Register
10
5
11
4
ARRAY PROTECTION
BP0
0
1
0
1
25XX080A/B
12
3
13
2
Array Addresses
Write-Protected
(0300h - 03FFh)
(0200h - 03FFh)
(0000h - 03FFh)
14
upper 1/4
upper 1/2
1
DS21808D-page 11
none
all
15
0