CAT25256ZD2I-GT2 ON Semiconductor, CAT25256ZD2I-GT2 Datasheet - Page 8

• Manufacturer Part Number: CAT25256ZD2I-GT2
• Description: EEPROM 256KB SPI SER CMOS EEPROM
• Manufacturer: ON Semiconductor

Specifications of CAT25256ZD2I-GT2

• Rohs: yes
• Memory Size: 256 Kbit
• Organization: 32 x 8
• Data Retention: 100 yr
• Maximum Clock Frequency: 1000 KHz
• Maximum Operating Current: 2 mA
• Operating Supply Voltage: 1.8 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TDFN-8
• Interface Type: SPI
• Minimum Operating Temperature: - 40 C

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
The CAT25256 device powers up into a write disable
The internal Write Enable Latch and the corresponding
SCK
SO
CS
SI
SCK
SO
CS
SI
Dashed Line = mode (1, 1)
Dashed Line = mode (1, 1)
0
0
Figure 3. WREN Timing
WRITE OPERATIONS
0
0
Figure 4. WRDI Timing
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0
0
HIGH IMPEDANCE
0
0
HIGH IMPEDANCE
8
0
0
instruction to the CAT25256. 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
1
1
0
0
0