CAT25040VI-GT3 ON Semiconductor, CAT25040VI-GT3 Datasheet - Page 5

• Manufacturer Part Number: CAT25040VI-GT3
• Description: IC EEPROM 4KBIT 10MHZ 8SOIC
• Manufacturer: ON Semiconductor

Specifications of CAT25040VI-GT3

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 4K (512 x 8)
• Speed: 10MHz
• 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)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 25040VI-GT3; CAT25040VI-GT3TR

disable state. The device contains a Write Enable Latch
(WEL) which must be set before attempting to write to the
memory array or to the status register. In addition, the
address of the memory location(s) to be written must be
outside the protected area, as defined by BP0 and BP1 bits
from the status register.
Write Enable and Write Disable
Status Register WEL bit are set by sending the WREN
Table 8. STATUS REGISTER
Table 9. BLOCK PROTECTION BITS
The CAT25010/20/40 device powers up into a write
The internal Write Enable Latch and the corresponding
BP1
7
1
SCK
Status Register Bits
0
0
1
1
SO
CS
SI
SCK
SO
CS
SI
Dashed Line = mode (1, 1)
Dashed Line = mode (1, 1)
6
1
BP0
0
1
0
1
None
CAT25010: 060−07F, CAT25020: 0C0−0FF, CAT25040: 180−1FF
CAT25010: 040−07F, CAT25020: 080−0FF, CAT25040: 100−1FF
CAT25010: 000−07F, CAT25020: 000−0FF, CAT25040: 000−1FF
5
1
0
0
Figure 3. WREN Timing
WRITE OPERATIONS
0
0
Figure 4. WRDI Timing
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4
1
Array Address Protected
0
0
HIGH IMPEDANCE
0
0
HIGH IMPEDANCE
5
0
0
instruction to the CAT25010/20/40. Care must be taken to
take the CS input high after the WREN instruction, as
otherwise the Write Enable Latch will not be properly set.
WREN timing is illustrated in Figure 3. The WREN
instruction must be sent prior to any WRITE or WRSR
instruction.
WRDI instruction as shown in Figure 4. Disabling write
operations by resetting the WEL bit, will protect the device
against inadvertent writes.
1
The internal write enable latch is reset by sending the
BP1
1
3
1
0
0
0
BP0
2
No Protection
Quarter Array Protection
Half Array Protection
Full Array Protection
WEL
1
Protection
RDY
0